Figured it out, had to use `--schema` instead of `--validate`.

    xmllint --schema yourxsd.xsd yourxml.xml --noout

The `--noout` makes sure your code in XSD and XML doesn&#39;t show. With this option you will only see the Validation Errors.

what would be the difference between the two approaches below?

&lt;!-- language: lang-js --&gt;

    export function* watchLoginUser() {
      yield takeEvery(USER_LOGIN, loginUser)
    }
    export function* watchLogoutUser() {
      yield takeEvery(USER_LOGOUT, logoutUser)
    }
    export function* watchGetParties() {
      yield takeEvery(PARTIES_GET, getParties)
    }
    export default function* root() {
      yield [
        fork(watchLoginUser),
        fork(watchLogoutUser),
        fork(watchGetParties)
      ]
    }


&lt;!-- language: lang-js --&gt;

    export default function* root() {
      yield [
        takeEvery(USER_LOGIN, loginUser),
        takeEvery(USER_LOGOUT, logoutUser),
        takeEvery(PARTIES_GET, getParties)
      ]
    }

When do I need to use fork and when not?

redux-saga when to use fork?

I am working on images to detect and fit the largest possible circle in any of the free areas of an image containing distributed particles:![1][1]

(able to detect the location of particle). 

One direction is to define a circle touching any 3-point combination, checking if the circle is empty, then finding the largest circle among all empty circles. However, it leads to a huge number of combination i.e. `C(n,3)`, where `n` is the total number of particles in the image.
 
I would appreciate if anyone can provide me any hint or alternate method that I can explore. 

  [1]: https://i.stack.imgur.com/8WX8Q.png

Fitting largest circle in free area in image with distributed particle

i have to validate my xml file with a given XSD file. Figured the easiest way to do so would be xmllint, but i can&#39;t get it to work. Can anyone tell me the exact command?

I tried:

         xmllint --valid myxsd.xsd myxml.xml

What am i doing wrong? This only outputs the 2 files in the command line


edit: have to do it in console, because it will be needed in a build process

how to Validate a XML file with XSD through xmllint

i have to validate my xml file with a given XSD file. Figured the easiest way to do so would be xmllint, but i can't get it to work. Can anyone tell me the exact command?
I tried:
<pre><code class="hljs language-css"> xmllint --valid myxsd.xsd myxml.xml
</code></pre>
What am i doing wrong? This only outputs the 2 files in the command line
edit: have to do it in console, because it will be needed in a build process

I have a small demo chat UI application. This application has a bottom navigation bar. I need the bottom navigation bar to hide when the keyboard appears.

[Here is an example of the chat UI][1]

As you can see when you click in the EditText element, the keyboard appears but the bottom navigation bar stays visible. I have tried methods such as [this measurement method][2], but the UI elements flicker [like this][3].

Is there a proper way to hide the bottom navigation bar when the keyboard is visible?

**EDIT:**
In the below activity you can see where I set the keyboard listener to adjust the position of UI elements when the keyboard is determined as being visible.

This is my activity code, uses setKeyboardListener method from the above link and set it in onCreateView:

    package uk.cal.codename.projectnedry.TeamChatFragment;

    import android.annotation.SuppressLint;
    import android.content.Context;
    import android.content.res.Configuration;
    import android.content.res.Resources;
    import android.graphics.Rect;
    import android.net.Uri;
    import android.os.Build;
    import android.os.Bundle;
    import android.support.v4.app.Fragment;
    import android.support.v7.app.AppCompatActivity;
    import android.support.v7.widget.LinearLayoutManager;
    import android.support.v7.widget.RecyclerView;
    import android.text.Layout;
    import android.util.DisplayMetrics;
    import android.util.Log;
    import android.util.TypedValue;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.view.ViewTreeObserver;
    import android.view.Window;
    import android.view.WindowManager;
    import android.view.inputmethod.InputMethodManager;
    import android.widget.Button;
    import android.widget.EditText;
    import android.widget.FrameLayout;
    import android.widget.ImageButton;
    import android.widget.LinearLayout;
    import android.widget.RelativeLayout;
    import android.widget.Toast;
    
    import com.roughike.bottombar.BottomBar;
    
    import java.util.ArrayList;
    
    import butterknife.BindView;
    import butterknife.ButterKnife;
    import uk.cal.codename.projectnedry.R;
    import uk.cal.codename.projectnedry.TeamChatFragment.ListAdapter.TeamChatListAdapter;
    import uk.demo.cal.genericmodelviewpresenter.GenericMvp.GenericMvpFragment;
    
    import static android.view.View.GONE;
    
    /**
     * A simple {@link Fragment} subclass.
     * Activities that contain this fragment must implement the
     * {@link TeamChatView.OnFragmentInteractionListener} interface
     * to handle interaction events.
     * Use the {@link TeamChatView#newInstance} factory method to
     * create an instance of this fragment.
     */
    public class TeamChatView extends GenericMvpFragment implements TeamChatContract.RequiredViewOps {
    
        private OnFragmentInteractionListener mListener;
        @BindView(R.id.teamChatList)
        RecyclerView mTeamChatRecyclerView;
        @BindView(R.id.teamChatSendButton)
        ImageButton mTeamChatSendButton;
        @BindView(R.id.messageTextInput)
        EditText mMessageTextInput;
        TeamChatListAdapter mTeamChatListAdapter;
        TeamChatListAdapter.ClickListener mTeamChatListClickListener;
        private ArrayList&lt;String&gt; mTestMessageList;
    
        public interface OnKeyboardVisibilityListener {
            void onVisibilityChanged(boolean visible);
        }
    
        public final void setKeyboardListener(final OnKeyboardVisibilityListener listener) {
            final View activityRootView = ((ViewGroup) getActivity().findViewById(android.R.id.content)).getChildAt(0);
    
            activityRootView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
    
                private boolean wasOpened;
    
                private final int DefaultKeyboardDP = 100;
    
                // From @nathanielwolf answer...  Lollipop includes button bar in the root. Add height of button bar (48dp) to maxDiff
                private final int EstimatedKeyboardDP = DefaultKeyboardDP + (Build.VERSION.SDK_INT &gt;= Build.VERSION_CODES.LOLLIPOP ? 48 : 0);
    
                private final Rect r = new Rect();
    
                @Override
                public void onGlobalLayout() {
                    // Convert the dp to pixels.
                    int estimatedKeyboardHeight = (int) TypedValue
                            .applyDimension(TypedValue.COMPLEX_UNIT_DIP, EstimatedKeyboardDP, activityRootView.getResources().getDisplayMetrics());
    
                    // Conclude whether the keyboard is shown or not.
                    activityRootView.getWindowVisibleDisplayFrame(r);
                    int heightDiff = activityRootView.getRootView().getHeight() - (r.bottom - r.top);
                    boolean isShown = heightDiff &gt;= estimatedKeyboardHeight;
    
                    if (isShown == wasOpened) {
                        Log.d(&quot;Keyboard state&quot;, &quot;Ignoring global layout change...&quot;);
                        return;
                    }
    
                    wasOpened = isShown;
                    listener.onVisibilityChanged(isShown);
                }
            });
        }
    
        public TeamChatView() {
            // Required empty public constructor
        }
    
        /**
         * Use this factory method to create a new instance of
         * this fragment using the provided parameters.
         *
         * @return A new instance of fragment TeamChatView.
         */
        public static TeamChatView newInstance() {
            TeamChatView fragment = new TeamChatView();
            Bundle args = new Bundle();
            fragment.setArguments(args);
            return fragment;
        }
    
        @SuppressLint(&quot;MissingSuperCall&quot;)
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(TeamChatPresenter.class, TeamChatModel.class, savedInstanceState);
        }
    
        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                 Bundle savedInstanceState) {
            // Inflate the layout for this fragment
            final View view = inflater.inflate(R.layout.fragment_team_chat_view, container, false);
            this.mUnbinder = ButterKnife.bind(this, view);
    
            mTestMessageList = new ArrayList&lt;&gt;();
            this.mTeamChatListAdapter = new TeamChatListAdapter(mTestMessageList);
            this.mTeamChatRecyclerView.setAdapter(this.mTeamChatListAdapter);
            final LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getContext());
            this.mTeamChatRecyclerView.setLayoutManager(linearLayoutManager);
    
            this.mTeamChatSendButton.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    if(!String.valueOf(mMessageTextInput.getText()).equals(&quot;&quot;)) {
                        getSpecificImpOfGenericPresenter().sendMessage(String.valueOf(mMessageTextInput.getText()));
                        mMessageTextInput.setText(&quot;&quot;);
                        mTeamChatRecyclerView.smoothScrollToPosition(mTestMessageList.size());
                    }
                }
            });
    
            setKeyboardListener(new OnKeyboardVisibilityListener(){
                @Override
                public void onVisibilityChanged(boolean visible) {
                    RelativeLayout contentFrame = (RelativeLayout) getActivity().findViewById(R.id.content_company_navigation);
                    BottomBar lowerNavigationBar = (BottomBar) getActivity().findViewById(R.id.bottomBar);
                    if (visible) { // if more than 100 pixels, its probably a keyboard...
                        lowerNavigationBar.setVisibility(GONE);
                        contentFrame.setPadding(0, 0, 0, 0);
                        mTeamChatRecyclerView.smoothScrollToPosition(mTestMessageList.size());
                    } else {
                        contentFrame.setPadding(0, 0, 0, convertDpToPixel(60, getContext()));
                        mTeamChatRecyclerView.smoothScrollToPosition(mTestMessageList.size());
                        lowerNavigationBar.setVisibility(View.VISIBLE);
                    }
                }
            });
            return view;
        }
    
        /**
         * This method converts dp unit to equivalent pixels, depending on device density.
         *
         * @param dp A value in dp (density independent pixels) unit. Which we need to convert into pixels
         * @param context Context to get resources and device specific display metrics
         * @return A float value to represent px equivalent to dp depending on device density
         */
        public static int convertDpToPixel(float dp, Context context){
            Resources resources = context.getResources();
            DisplayMetrics metrics = resources.getDisplayMetrics();
            int px = (int) (dp * ((float)metrics.densityDpi / DisplayMetrics.DENSITY_DEFAULT));
            return px;
        }
    
        public void addToTestMessageList(String str){
            this.mTestMessageList.add(str);
            this.mTeamChatListAdapter.notifyDataSetChanged();
        }
        
        @Override
        public void onDestroyView() {
            super.onDestroyView();
           // getView().getViewTreeObserver().removeGlobalOnLayoutListener(test);
        }
    
        @Override
        public TeamChatPresenter getSpecificImpOfGenericPresenter() {
            return (TeamChatPresenter) this.mPresenter;
        }
    }

This is my XML layout:

    &lt;RelativeLayout xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
        xmlns:tools=&quot;http://schemas.android.com/tools&quot;
        android:layout_width=&quot;match_parent&quot;
        android:layout_height=&quot;match_parent&quot;
        android:orientation=&quot;vertical&quot;
        tools:context=&quot;uk.cal.codename.projectnedry.TeamChatFragment.TeamChatView&quot;&gt;
    
        &lt;android.support.v7.widget.RecyclerView
            android:layout_above=&quot;@+id/chatViewMessageEntryLayout&quot;
            android:id=&quot;@+id/teamChatList&quot;
            android:layout_width=&quot;match_parent&quot;
            android:layout_height=&quot;match_parent&quot;
            android:layout_alignParentTop=&quot;true&quot;
            android:isScrollContainer=&quot;false&quot;
            android:paddingTop=&quot;10dp&quot;
            android:scrollbars=&quot;vertical&quot; /&gt;    
    
        &lt;RelativeLayout
            android:id=&quot;@+id/chatViewMessageEntryLayout&quot;
            android:layout_width=&quot;match_parent&quot;
            android:layout_height=&quot;60dp&quot;
            android:layout_alignParentBottom=&quot;true&quot;
            android:orientation=&quot;horizontal&quot;&gt;
    
            &lt;View
                android:id=&quot;@+id/chatViewMessageEntrySeperator&quot;
                android:layout_width=&quot;match_parent&quot;
                android:layout_height=&quot;1dp&quot;
                android:background=&quot;#e3e3e8&quot; /&gt;
    
            &lt;EditText
                android:id=&quot;@+id/messageTextInput&quot;
                android:layout_width=&quot;match_parent&quot;
                android:layout_height=&quot;match_parent&quot;
                android:layout_gravity=&quot;center_vertical&quot;
                android:layout_below=&quot;@+id/chatViewMessageEntrySeperator&quot;
                android:layout_toLeftOf=&quot;@+id/teamChatSendButton&quot;
                android:background=&quot;@android:color/transparent&quot;
                android:hint=&quot;Enter message&quot;
                android:inputType=&quot;textCapSentences|textMultiLine&quot;
                android:maxLength=&quot;1000&quot;
                android:maxLines=&quot;4&quot;
                android:paddingLeft=&quot;10dp&quot; /&gt;
    
            &lt;ImageButton
                android:id=&quot;@+id/teamChatSendButton&quot;
                android:layout_width=&quot;50dp&quot;
                android:layout_height=&quot;match_parent&quot;
                android:layout_alignParentRight=&quot;true&quot;
                android:layout_gravity=&quot;center&quot;
                android:background=&quot;#00B9EF&quot;
                android:src=&quot;@drawable/ic_send_white_24dp&quot; /&gt;
    
        &lt;/RelativeLayout&gt;
    
    &lt;/RelativeLayout&gt;


  [1]: http://i.imgur.com/5jHtAeD.mp4
  [2]: https://stackoverflow.com/questions/2150078/how-to-check-visibility-of-software-keyboard-in-android/18992807#18992807
  [3]: https://i.imgur.com/C2eNJBd.gifv

Hiding ‘Bottom Navigation Bar’ whilst keyboard is present - Android

When using `SQL` or `MySQL` (or any relational DB for that matter) - I understand that saving the data in regular columns is better for indexing sake and other purposes...

The thing is loading and saving `JSON` data is sometimes a lot more simple - and makes the development easier.

Are there any &quot;golden rules&quot; for saving raw `JSON` data in the DB?

Is it absolutely a bad practice to do so?

When can I save JSON or XML data in an SQL Table

I&#39;m making a simple test app using ConstraintLayout, but I have a problem. 

Here is my code:

**activity_main.xml**

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
    &lt;layout xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
        xmlns:app=&quot;http://schemas.android.com/apk/res-auto&quot;
        xmlns:tools=&quot;http://schemas.android.com/tools&quot;&gt;

    &lt;android.support.constraint.ConstraintLayout
        android:layout_width=&quot;match_parent&quot;
        android:layout_height=&quot;match_parent&quot;
        tools:context=&quot;com.example.user.myapplication.activity.MainActivity&quot;&gt;

        &lt;Button
            android:id=&quot;@+id/btn_launch&quot;
            android:layout_width=&quot;wrap_content&quot;
            android:layout_height=&quot;wrap_content&quot;
            android:layout_marginEnd=&quot;8dp&quot;
            android:layout_marginTop=&quot;16dp&quot;
            android:text=&quot;launch&quot;
            app:layout_constraintHorizontal_bias=&quot;1.0&quot;
            app:layout_constraintLeft_toLeftOf=&quot;parent&quot;
            app:layout_constraintRight_toRightOf=&quot;parent&quot;
            app:layout_constraintTop_toTopOf=&quot;parent&quot; /&gt;

        &lt;TextView
            android:id=&quot;@+id/text_view&quot;
            android:layout_width=&quot;100dp&quot;
            android:layout_height=&quot;50dp&quot;
            android:layout_marginEnd=&quot;16dp&quot;
            android:layout_marginTop=&quot;16dp&quot;
            android:text=&quot;Hello World!&quot;
            app:layout_constraintHorizontal_bias=&quot;1&quot;
            app:layout_constraintLeft_toLeftOf=&quot;parent&quot;
            app:layout_constraintRight_toRightOf=&quot;parent&quot;
            app:layout_constraintTop_toBottomOf=&quot;@+id/btn_launch&quot; /&gt;

        &lt;include
            layout=&quot;@layout/content_main&quot;
            app:layout_constraintBottom_toBottomOf=&quot;parent&quot;
            app:layout_constraintLeft_toLeftOf=&quot;parent&quot;
            app:layout_constraintRight_toRightOf=&quot;parent&quot;
            app:layout_constraintTop_toBottomOf=&quot;@+id/text_view&quot; /&gt;

    &lt;/android.support.constraint.ConstraintLayout&gt;
&lt;/layout&gt;

**content_main.xml**

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
    &lt;layout xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
        xmlns:app=&quot;http://schemas.android.com/apk/res-auto&quot;
        xmlns:tools=&quot;http://schemas.android.com/tools&quot;&gt;

    &lt;android.support.constraint.ConstraintLayout
        android:layout_width=&quot;wrap_content&quot;
        android:layout_height=&quot;wrap_content&quot;
        android:orientation=&quot;vertical&quot;&gt;

        &lt;TextView
            android:id=&quot;@+id/textView2&quot;
            android:layout_width=&quot;wrap_content&quot;
            android:layout_height=&quot;wrap_content&quot;
            android:layout_marginTop=&quot;8dp&quot;
            android:text=&quot;123456&quot;
            app:layout_constraintLeft_toLeftOf=&quot;parent&quot;
            app:layout_constraintRight_toRightOf=&quot;parent&quot;
            app:layout_constraintTop_toTopOf=&quot;parent&quot; /&gt;

        &lt;TextView
            android:id=&quot;@+id/textView3&quot;
            android:layout_width=&quot;wrap_content&quot;
            android:layout_height=&quot;wrap_content&quot;
            android:layout_marginLeft=&quot;8dp&quot;
            android:layout_marginRight=&quot;8dp&quot;
            android:layout_marginTop=&quot;8dp&quot;
            android:text=&quot;98765&quot;
            app:layout_constraintLeft_toLeftOf=&quot;parent&quot;
            app:layout_constraintRight_toRightOf=&quot;parent&quot;
            app:layout_constraintTop_toBottomOf=&quot;@+id/textView2&quot; /&gt;

        &lt;TextView
            android:id=&quot;@+id/textView&quot;
            android:layout_width=&quot;wrap_content&quot;
            android:layout_height=&quot;wrap_content&quot;
            android:layout_marginLeft=&quot;8dp&quot;
            android:layout_marginRight=&quot;8dp&quot;
            android:layout_marginTop=&quot;8dp&quot;
            android:text=&quot;abc&quot;
            app:layout_constraintLeft_toLeftOf=&quot;parent&quot;
            app:layout_constraintRight_toRightOf=&quot;parent&quot;
            app:layout_constraintTop_toBottomOf=&quot;@+id/textView3&quot; /&gt;

    &lt;/android.support.constraint.ConstraintLayout&gt;
&lt;/layout&gt;

**Code result**
 
[![Problem][1]][1]

&lt;/br&gt;

 I want &quot;**content_main**&quot; to be under the &quot;Hello world!&quot; TextView.

I using RelativeLayout, LinearLayout, ConstraintLayout at &quot;**content_main**&quot; element, but they do not not work.

I don&#39;t find any solution.

Does the Android &quot;include&quot; tag not work with ConstraintLayout? 

  [1]: https://i.stack.imgur.com/aFdND.png 


Android add other layout in ConstraintLayout using include tag

I&#39;m using constraintLyout v 1.0.1.

I would like to include in my xml a sub ConstraintLayout corresponding to a part of my global layout (which itself is a ConstraintLayout). I split the layout in two xmls in order to use this sub part elsewhere

I tried this but I have no control on where to place my sub constraint layout in the parent. I wonder if I have to place everything in the same xml file or if their is a solution to use separate files.

*tmp_1.xml*

    &lt;android.support.constraint.ConstraintLayout
        xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
        xmlns:app=&quot;http://schemas.android.com/apk/res-auto&quot;
        android:orientation=&quot;vertical&quot;
        android:layout_width=&quot;match_parent&quot;
        android:layout_height=&quot;match_parent&quot;
        &gt;
        &lt;TextView
            android:id=&quot;@+id/label&quot;
            android:layout_width=&quot;wrap_content&quot;
            android:layout_height=&quot;wrap_content&quot;
            android:text=&quot;LABEL1&quot;
            app:layout_constraintStart_toStartOf=&quot;parent&quot;
            app:layout_constraintEnd_toEndOf=&quot;parent&quot;
            app:layout_constraintTop_toTopOf=&quot;parent&quot;
            android:layout_marginTop=&quot;16dp&quot;
            /&gt;
        &lt;TextView
            android:id=&quot;@+id/label_2&quot;
            android:layout_width=&quot;wrap_content&quot;
            android:layout_height=&quot;wrap_content&quot;
            android:text=&quot;LABEL2&quot;
            app:layout_constraintStart_toStartOf=&quot;@id/label&quot;
            app:layout_constraintEnd_toEndOf=&quot;@id/label&quot;
            app:layout_constraintTop_toBottomOf=&quot;@id/label&quot;
            android:layout_marginTop=&quot;16dp&quot;
            /&gt;

        &lt;include layout=&quot;@layout/tmp_2&quot; /&gt;
    &lt;/android.support.constraint.ConstraintLayout&gt;
*tmp_2.xml*


    &lt;android.support.constraint.ConstraintLayout
        xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
        xmlns:app=&quot;http://schemas.android.com/apk/res-auto&quot;
        android:orientation=&quot;vertical&quot;
        android:layout_width=&quot;match_parent&quot;
        android:layout_height=&quot;wrap_content&quot;
        &gt;
        &lt;TextView
            android:id=&quot;@+id/view_80&quot;
            android:layout_width=&quot;wrap_content&quot;
            android:layout_height=&quot;wrap_content&quot;
            android:text=&quot;80th element&quot;
            app:layout_constraintStart_toStartOf=&quot;parent&quot;
            app:layout_constraintTop_toTopOf=&quot;parent&quot;
            android:layout_marginTop=&quot;10dp&quot;
            android:layout_marginStart=&quot;12dp&quot;
            /&gt;
    &lt;/android.support.constraint.ConstraintLayout&gt;

The result is this 

[![Actual result][1]][1]


But i want it to be this

[![Expected result][2]][2]
 

I tried this but it does not work 

    &lt;include 
        app:layout_constraintTop_toBottomOf=&quot;@id/label_2&quot;
        layout=&quot;@layout/tmp_2&quot; /&gt;


  [1]: https://i.stack.imgur.com/wfmjH.png
  [2]: https://i.stack.imgur.com/LCS3H.png

How to include constraint layout to another constraint layout and set constraint between each

Logcat

    05-11 19:14:52.567 4489-4489/? E/AndroidRuntime: 
    FATAL EXCEPTION: main                                                  
           Process: com.grab.deals.dealcart, PID: 4489
           java.lang.RuntimeException: Unable to start activity ComponentInfo{com.grab.deals.dealcart/com.grab.deals.dealcart.Full_view.Full_view}: android.view.InflateException: Binary XML file line #141: Attempt to invoke virtual method &#39;boolean java.lang.String.equals(java.lang.Object)&#39; on a null object reference
           at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)
           at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
           at android.app.ActivityThread.-wrap11(ActivityThread.java)
           at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
           at android.os.Handler.dispatchMessage(Handler.java:102)
           at android.os.Looper.loop(Looper.java:148)
           at android.app.ActivityThread.main(ActivityThread.java:5417)
           at java.lang.reflect.Method.invoke(Native Method)
           at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
           at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
           Caused by: android.view.InflateException: Binary XML file line #141: Attempt to invoke virtual method &#39;boolean java.lang.String.equals(java.lang.Object)&#39; on a null object reference
           at android.view.LayoutInflater.inflate(LayoutInflater.java:539)
           at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
           at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
           at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:284)
           at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:143)
           at com.grab.deals.dealcart.Full_view.Full_view.onCreate(Full_view.java:13)
           at android.app.Activity.performCreate(Activity.java:6237)
           at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
           at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
           at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)&#160;
           at android.app.ActivityThread.-wrap11(ActivityThread.java)&#160;
           at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)&#160;
           at android.os.Handler.dispatchMessage(Handler.java:102)&#160;
           at android.os.Looper.loop(Looper.java:148)&#160;
           at android.app.ActivityThread.main(ActivityThread.java:5417)&#160;
           at java.lang.reflect.Method.invoke(Native Method)&#160;
           at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)&#160;
           at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)&#160;
           Caused by: java.lang.NullPointerException: Attempt to invoke virtual method &#39;boolean java.lang.String.equals(java.lang.Object)&#39; on a null object reference
           at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:738)
           at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)
           at android.view.LayoutInflater.rInflate(LayoutInflater.java:835)
           at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798)
           at android.view.LayoutInflater.rInflate(LayoutInflater.java:838)
           at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798)
           at android.view.LayoutInflater.rInflate(LayoutInflater.java:838)
           at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798)
           at android.view.LayoutInflater.rInflate(LayoutInflater.java:838)
           at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798)
           at android.view.LayoutInflater.rInflate(LayoutInflater.java:838)
           at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798)
           at android.view.LayoutInflater.inflate(LayoutInflater.java:515)
           at android.view.LayoutInflater.inflate(LayoutInflater.java:423)&#160;
           at android.view.LayoutInflater.inflate(LayoutInflater.java:374)&#160;
           at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:284)&#160;
           at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:143)&#160;
           at com.grab.deals.dealcart.Full_view.Full_view.onCreate(Full_view.java:13)&#160;
           at android.app.Activity.performCreate(Activity.java:6237)&#160;
           at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)&#160;
           at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)&#160;
           at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)&#160;
           at android.app.ActivityThread.-wrap11(ActivityThread.java)&#160;
           at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)&#160;
           at android.os.Handler.dispatchMessage(Handler.java:102)&#160;
           at android.os.Looper.loop(Looper.java:148)&#160;
           at android.app.ActivityThread.main(ActivityThread.java:5417)&#160;
           at java.lang.reflect.Method.invoke(Native Method)&#160;
           at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)&#160;
           at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)&#160;

ExtendView.xml


        &lt;RelativeLayout xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
        xmlns:tools=&quot;http://schemas.android.com/tools&quot;
        xmlns:app=&quot;http://schemas.android.com/apk/res-auto&quot;
        android:id=&quot;@+id/activity_full_view&quot;
        android:layout_width=&quot;match_parent&quot;
        android:layout_height=&quot;match_parent&quot;&gt;
        &lt;ScrollView
            android:layout_width=&quot;match_parent&quot;
            android:layout_height=&quot;match_parent&quot;&gt;
            &lt;LinearLayout
                android:layout_width=&quot;match_parent&quot;
                android:layout_height=&quot;match_parent&quot;
                android:orientation=&quot;vertical&quot;&gt;
        &lt;android.support.v7.widget.CardView
            android:layout_width=&quot;match_parent&quot;
            android:layout_height=&quot;match_parent&quot;
            android:layout_margin=&quot;5dp&quot;&gt;
            &lt;LinearLayout
                android:layout_width=&quot;match_parent&quot;
                android:layout_height=&quot;match_parent&quot;
                android:orientation=&quot;vertical&quot;&gt;
            &lt;ImageView
                android:layout_width=&quot;match_parent&quot;
                android:layout_height=&quot;300dp&quot;
    
                android:id=&quot;@+id/img&quot;/&gt;
            &lt;View
                android:layout_width=&quot;match_parent&quot;
                android:layout_height=&quot;1dp&quot;/&gt;
                &lt;TextView
                    android:layout_width=&quot;wrap_content&quot;
                    android:layout_height=&quot;wrap_content&quot;
                    android:text=&quot;Designer shirt&quot;
                    android:textSize=&quot;15dp&quot;
                    android:layout_marginLeft=&quot;10dp&quot;
                    android:textColor=&quot;#000&quot;/&gt;
                &lt;LinearLayout
                    android:layout_width=&quot;wrap_content&quot;
                    android:layout_height=&quot;wrap_content&quot;
                    android:orientation=&quot;horizontal&quot;&gt;
                    &lt;TextView
                        android:layout_width=&quot;wrap_content&quot;
                        android:layout_height=&quot;wrap_content&quot;
                        android:textSize=&quot;12dp&quot;
                        android:text=&quot;Speatial Price&quot;
                        android:layout_marginLeft=&quot;10dp&quot;
                        android:textColor=&quot;#34a853&quot;/&gt;
                    &lt;TextView
                        android:layout_width=&quot;wrap_content&quot;
                        android:layout_marginLeft=&quot;5dp&quot;
                        android:layout_height=&quot;wrap_content&quot;
                        android:textColor=&quot;#000&quot;
                        android:text=&quot;Ends in few hours&quot;
                       /&gt;
                &lt;/LinearLayout&gt;
                &lt;LinearLayout
                    android:layout_width=&quot;wrap_content&quot;
                    android:layout_height=&quot;wrap_content&quot;
                    android:orientation=&quot;horizontal&quot;&gt;
                &lt;TextView
                    android:layout_width=&quot;wrap_content&quot;
                    android:layout_height=&quot;wrap_content&quot;
                    android:textSize=&quot;20dp&quot;
                    android:text=&quot;25,000&quot;
                    android:layout_marginLeft=&quot;10dp&quot;
                    android:textColor=&quot;#000&quot;/&gt;
                    &lt;TextView
                        android:layout_width=&quot;wrap_content&quot;
                        android:layout_marginLeft=&quot;10dp&quot;
                        android:layout_height=&quot;wrap_content&quot;
                        android:textColor=&quot;@color/colorPrimary&quot;
                        android:text=&quot;70%off&quot;
                        android:textSize=&quot;15dp&quot;/&gt;
                &lt;/LinearLayout&gt;
            &lt;LinearLayout
                android:layout_width=&quot;wrap_content&quot;
                android:layout_height=&quot;wrap_content&quot;
                android:orientation=&quot;horizontal&quot;&gt;
                &lt;TextView
                    android:layout_width=&quot;wrap_content&quot;
                    android:layout_marginLeft=&quot;10dp&quot;
                    android:layout_height=&quot;wrap_content&quot;
                    android:textColor=&quot;#34a853&quot;
                    android:text=&quot;4.1&quot;/&gt;
    
                &lt;ImageView
                    android:layout_width=&quot;15dp&quot;
                    android:layout_height=&quot;15dp&quot;
                    app:srcCompat=&quot;@drawable/ic_star_border_black_24dp&quot;/&gt;
                &lt;/LinearLayout&gt;
                &lt;View
                    android:layout_width=&quot;match_parent&quot;
                    android:layout_height=&quot;1dp&quot;/&gt;
    &lt;LinearLayout
        android:layout_width=&quot;match_parent&quot;
        android:layout_height=&quot;wrap_content&quot;
        android:orientation=&quot;horizontal&quot;
        android:gravity=&quot;center&quot;
        android:layout_gravity=&quot;center&quot;
        android:layout_marginBottom=&quot;5dp&quot;&gt;
    
    
     &lt;ImageView
         android:layout_width=&quot;30dp&quot;
         android:layout_height=&quot;30dp&quot;
         app:srcCompat=&quot;@drawable/copy&quot;/&gt;
        &lt;TextView
            android:layout_width=&quot;wrap_content&quot;
            android:layout_height=&quot;wrap_content&quot;
            android:textColor=&quot;#000&quot;
            android:layout_marginLeft=&quot;10dp&quot;
            android:text=&quot;Copy Coupon&quot;
            android:textSize=&quot;20sp&quot;
            /&gt;
    
    
    &lt;/LinearLayout&gt;
            &lt;/LinearLayout&gt;
    
        &lt;/android.support.v7.widget.CardView&gt;
    
    
            &lt;android.support.v7.widget.CardView
                android:layout_width=&quot;match_parent&quot;
                android:layout_height=&quot;wrap_content&quot;
                android:layout_margin=&quot;5dp&quot;
                &gt;
                &lt;LinearLayout
                    android:layout_width=&quot;match_parent&quot;
                    android:layout_height=&quot;wrap_content&quot;
                    android:orientation=&quot;vertical&quot;&gt;
    &lt;TextView
        android:layout_width=&quot;match_parent&quot;
        android:layout_height=&quot;match_parent&quot;
        android:text=&quot;Details&quot;
        android:layout_margin=&quot;20dp&quot;
        android:textSize=&quot;20sp&quot;
        android:textColor=&quot;#000&quot;/&gt;
                    &lt;view
                        android:layout_width=&quot;match_parent&quot;
                        android:layout_height=&quot;1dp&quot;/&gt;
    
                    &lt;TextView
                        android:layout_width=&quot;wrap_content&quot;
                        android:layout_height=&quot;wrap_content&quot;
                        android:textSize=&quot;17sp&quot;
                        android:textColor=&quot;#000&quot;
                        android:layout_margin=&quot;20dp&quot;
                        android:text=&quot;Heighlets \n*shgdfshdflshflsjh\n*a;sjkdfjshgf&quot;/&gt;
                &lt;/LinearLayout&gt;
            &lt;/android.support.v7.widget.CardView&gt;
    
                &lt;android.support.v7.widget.CardView
                    android:layout_width=&quot;match_parent&quot;
                    android:layout_height=&quot;wrap_content&quot;
                    android:layout_margin=&quot;5dp&quot;
                    &gt;
                    &lt;LinearLayout
                        android:layout_width=&quot;match_parent&quot;
                        android:layout_height=&quot;wrap_content&quot;
                        android:orientation=&quot;vertical&quot;&gt;
                        &lt;TextView
                            android:layout_width=&quot;match_parent&quot;
                            android:layout_height=&quot;match_parent&quot;
                            android:text=&quot;Terms and Conditions&quot;
                            android:layout_margin=&quot;20dp&quot;
                            android:textSize=&quot;20sp&quot;
                            android:textColor=&quot;#000&quot;/&gt;
                        &lt;view
                            android:layout_width=&quot;match_parent&quot;
                            android:layout_height=&quot;1dp&quot;/&gt;
    
                        &lt;TextView
                            android:layout_width=&quot;wrap_content&quot;
                            android:layout_height=&quot;wrap_content&quot;
                            android:textSize=&quot;17sp&quot;
                            android:textColor=&quot;#000&quot;
                            android:layout_margin=&quot;20dp&quot;
                            android:text=&quot;Heighlets \n*shgdfshdflshflsjh\n*a;sjkdfjshgf&quot;/&gt;
                    &lt;/LinearLayout&gt;
                &lt;/android.support.v7.widget.CardView&gt;
    
                &lt;android.support.v7.widget.CardView
                    android:layout_width=&quot;match_parent&quot;
                    android:layout_height=&quot;wrap_content&quot;
                    android:layout_margin=&quot;5dp&quot;
                    &gt;
                    &lt;LinearLayout
                        android:layout_width=&quot;match_parent&quot;
                        android:layout_height=&quot;wrap_content&quot;
                        android:orientation=&quot;vertical&quot;&gt;
                        &lt;TextView
                            android:layout_width=&quot;match_parent&quot;
                            android:layout_height=&quot;match_parent&quot;
                            android:text=&quot;Ratings &amp;amp; Reviews&quot;
                            android:layout_margin=&quot;20dp&quot;
                            android:textSize=&quot;20sp&quot;
                            android:textColor=&quot;#000&quot;/&gt;
                        &lt;view
                            android:layout_width=&quot;match_parent&quot;
                            android:layout_height=&quot;1dp&quot;/&gt;
                        &lt;LinearLayout
                            android:layout_width=&quot;wrap_content&quot;
                            android:layout_height=&quot;wrap_content&quot;
                            android:layout_gravity=&quot;center&quot;
                            android:layout_margin=&quot;20dp&quot;
                            android:orientation=&quot;vertical&quot;&gt;
                        &lt;LinearLayout
                            android:layout_width=&quot;wrap_content&quot;
                            android:layout_height=&quot;wrap_content&quot;
                            android:layout_gravity=&quot;center&quot;
                            android:orientation=&quot;horizontal&quot;&gt;
    
                            &lt;TextView
                                android:layout_width=&quot;wrap_content&quot;
                                android:layout_height=&quot;wrap_content&quot;
                                android:text=&quot;4.1&quot;
                                android:layout_marginRight=&quot;10dp&quot;
                                android:textSize=&quot;40sp&quot;/&gt;
                            &lt;ImageView
                                android:layout_width=&quot;50dp&quot;
                                android:layout_height=&quot;50dp&quot;
                                app:srcCompat=&quot;@drawable/ic_star_border_black_24dp&quot;/&gt;
                        &lt;/LinearLayout&gt;
                            &lt;TextView
                                android:layout_width=&quot;wrap_content&quot;
                                android:layout_height=&quot;wrap_content&quot;
                                android:text=&quot;1,500 Reviews&quot;
                                /&gt;
                        &lt;/LinearLayout&gt;
    
                               &lt;/LinearLayout&gt;
                &lt;/android.support.v7.widget.CardView&gt;
        &lt;/LinearLayout&gt;
            &lt;/ScrollView&gt;
    &lt;LinearLayout
        android:layout_width=&quot;match_parent&quot;
        android:layout_height=&quot;wrap_content&quot;
        android:orientation=&quot;horizontal&quot;
        android:background=&quot;#fff&quot;
        android:layout_alignParentBottom=&quot;true&quot;
        android:gravity=&quot;center&quot;&gt;
        &lt;Button
            android:layout_width=&quot;180dp&quot;
            android:layout_height=&quot;50dp&quot;
            android:text=&quot;Share&quot;
            style=&quot;@style/Widget.AppCompat.Button.Borderless.Colored&quot;/&gt;
    
        &lt;Button
            android:layout_width=&quot;180dp&quot;
            android:layout_height=&quot;50dp&quot;
            android:text=&quot;Visit&quot;
            android:textColor=&quot;#fff&quot;
            style=&quot;@style/Widget.AppCompat.Button.Borderless.Colored&quot;
            android:background=&quot;@color/colorPrimary&quot;/&gt;
    
    
    
    &lt;/LinearLayout&gt;
    
    
    &lt;/RelativeLayout&gt;


Full_View.java


 

       
    public class Full_View extends Fragment {
    
        @Nullable
        @Override
        public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
            View rootview = inflater.inflate(R.layout.activity_full_view,container,false);
            return rootview;
        }
    
    }




Getting Binary XML file line #141: Attempt to invoke virtual method &#39;boolean java.lang.String.equals(java.lang.Object)&#39; on a null object reference

I am new to using Linux and I broke some php settings while tampering. 

If I execute a php script containing: `phpinfo();` it shows the php versions as 5.6,
but via the command line, if I run `php -v` it returns a version of 7.0.

I want to have both versions match.  
How can i fix my command line PATH to also use php 5.6?

How can I change php-cli version on Ubuntu 14.04?

Before you post this as a duplicate; I&#39;ve tried many of the suggestions I found around SO.

So far I&#39;ve been using postman to post data to a Java web service. That works great as follows:

[![enter image description here][1]][1]

I now want to do the same using curl, so I tried it using the following ways:

    $ curl -X POST --data &quot;this is raw data&quot; http://78.41.xx.xx:7778/
    $ curl -X POST --data-binary &quot;this is raw data&quot; http://78.41.xx.xx:7778/
    $ curl -X POST --data &quot;@/home/kramer65/afile.txt&quot; http://78.41.xx.xx:7778/
    $ curl -X POST --data-binary &quot;@/home/kramer65/afile.txt&quot; http://78.41.xx.xx:7778/

Unfortunately, all of those show an empty raw body on the receiving side. 

Does anybody know what I&#39;m doing wrong here? How is my curl request different from my postman request? All tips are welcome!


  [1]: https://i.stack.imgur.com/voBZy.png


How to post raw body data with curl?

The other day I decided that I wanted the command python to default to firing up python3 instead of python2.

So I did this:

    $ sudo update-alternatives --install /usr/bin/python python /usr/bin/python2.7 2

    $ sudo update-alternatives --install /usr/bin/python python /usr/bin/python3.5 3

    $ sudo update-alternatives --config python

    $ sudo update-alternatives --config python
    There are 2 choices for the alternative python (providing /usr/bin/python).
    
      Selection    Path                Priority   Status
    ------------------------------------------------------------
    * 0            /usr/bin/python3.5   3         auto mode
      1            /usr/bin/python2.7   2         manual mode
      2            /usr/bin/python3.5   3         manual mode
    
    Press &lt;enter&gt; to keep the current choice[*], or type selection number: 0

And that all worked. Great! :)

    $ python -V
    Python 3.5.2

But it wasn&#39;t long before I realised I had broken apt/aptitude when it comes to installing and removing python packages because apt was expecting python2 it transpired.

This is what happened.

    $ sudo apt remove  python-samba
    Reading package lists... Done
    Building dependency tree       
    Reading state information... Done
    The following package was automatically installed and is no longer required:
      samba-libs
    Use &#39;sudo apt autoremove&#39; to remove it.
    The following packages will be REMOVED:
      python-samba
    0 upgraded, 0 newly installed, 1 to remove and 0 not upgraded.
    After this operation, 5,790 kB disk space will be freed.
    Do you want to continue? [Y/n] 
    (Reading database ... 187285 files and directories currently installed.)
    Removing python-samba (2:4.3.11+dfsg-0ubuntu0.16.04.5) ...
      File &quot;/usr/bin/pyclean&quot;, line 63
        except (IOError, OSError), e:
                                 ^
    SyntaxError: invalid syntax
    dpkg: error processing package python-samba (--remove):
     subprocess installed pre-removal script returned error exit status 1
    Traceback (most recent call last):
      File &quot;/usr/bin/pycompile&quot;, line 35, in &lt;module&gt;
        from debpython.version import SUPPORTED, debsorted, vrepr, \
      File &quot;/usr/share/python/debpython/version.py&quot;, line 24, in &lt;module&gt;
        from ConfigParser import SafeConfigParser
    ImportError: No module named &#39;ConfigParser&#39;
    dpkg: error while cleaning up:
     subprocess installed post-installation script returned error exit status 1
    Errors were encountered while processing:
     python-samba
    E: Sub-process /usr/bin/dpkg returned an error code (1)
    

Eventually I guessed it wanted python2 as the default, so I undid my changes as follows:

    $ sudo update-alternatives --config python
    There are 2 choices for the alternative python (providing /usr/bin/python).
    
      Selection    Path                Priority   Status
    ------------------------------------------------------------
    * 0            /usr/bin/python3.5   3         auto mode
      1            /usr/bin/python2.7   2         manual mode
      2            /usr/bin/python3.5   3         manual mode
    
    Press &lt;enter&gt; to keep the current choice[*], or type selection number: 1
    
    $ python -V
    Python 2.7.12
    
And then apt worked again

    $ sudo apt remove  python-samba
    Reading package lists... Done
    Building dependency tree       
    Reading state information... Done
    The following package was automatically installed and is no longer required:
      samba-libs
    Use &#39;sudo apt autoremove&#39; to remove it.
    The following packages will be REMOVED:
      python-samba
    0 upgraded, 0 newly installed, 1 to remove and 0 not upgraded.
    1 not fully installed or removed.
    After this operation, 5,790 kB disk space will be freed.
    Do you want to continue? [Y/n] 
    (Reading database ... 187285 files and directories currently installed.)
    Removing python-samba (2:4.3.11+dfsg-0ubuntu0.16.04.5) ...


So I have had to leave it as defaulting to python 2 but I develop in python 3 and so would like my system to default to python 3 for when I run python and idle.

Can anyone tell me how I can achieve this without breaking apt?

My system is a Raspberry Pi 3B running Ubuntu:

    Linux mymachine 4.4.38-v7+ #938 SMP Thu Dec 15 15:22:21 GMT 2016 armv7l armv7l armv7l GNU/Linux

(It&#39;s actually an arm v8)

    $ cat /etc/lsb-release 
    DISTRIB_ID=Ubuntu
    DISTRIB_RELEASE=16.04
    DISTRIB_CODENAME=xenial
    DISTRIB_DESCRIPTION=&quot;Ubuntu 16.04.2 LTS&quot;



How to update-alternatives to Python 3 without breaking apt?

The [Boehm&#39;s conservative garbage collector][1] is quite useful (e.g. [Bigloo][2] is using it, [Guile][3] is using something similar, etc....), notably on Linux (which is the only OS I care about; I&#39;m using Debian/Sid/x86-64 if that matters, and `libgc-dev` package is version `1:7.4.2-8` so the Boehm GC is 7.4.2).

However, **Boehm&#39;s GC** requires to be aware of every thread using it. Its [gc_pthreads_redirects.h][4] (more or less internal) header file **is redefining `pthread_create`** as 

    # define pthread_create GC_pthread_create


Actually, what Boehm&#39;s GC needs is [GC_register_my_thread][5] to be called early in the new thread call stack (and `GC_pthread_create` is doing that).


In the past, Glib (2.46) provided a way to redefine memory allocation using [`struct GMemVTable` which is **deprecated**][6] **and cannot be used** anymore (my Debian&#39;s `libglib2.02.0-dev` package is version `2.50.3-2`). There is a [`g_mem_gc_friendly` global boolean][7] but when looking into Glib source code it simply clears memory zones before freeing them.

Recent GTK3 (my `libgtk-3-dev`  package has version `3.22.11-1`) are creating threads (for something probably related to Dbus, and perhaps also to GtkTextView...) using (indirectly) `pthread_create` thru [Glib thread functions][8]. And there is no way (except by patching the source code) to be notified of that thread creation. I&#39;m afraid than any GTK callback I would install (e.g. using [`g_signal_connect`][9]) might be called from these threads. Or that if I subclass a GTK widget with some methods which might use (or access) some `GC_malloc`-ed buffer there could be a disaster.

On the other hand, there is a strong coding rule in GTK that all GTK operations should happen only in the main thread. To quote [Gdk3 Threads][10] page:

&gt; **GTK+**, however, **is *not* thread safe**. You should only use GTK+ and GDK from the thread `gtk_init()` and `gtk_main()` were called on. This is usually referred to as the “main thread”.

If I follow this rule myself, I am sure that no internal GTK code will ever call my callbacks (using Boehm GC) from some non-main thread?

My intuition is that if ever `GC_alloc` is called from outside the main thread by GTK internals (not directly by my code) a disaster would happen
(because these GTK-internal threads have not been started with `GC_pthread_create`; there might call some of my code, e.g. because I am subclassing some existing GTK widget, or because I connected some GTK signal, even if I don&#39;t myself code things using GTK &amp; Boehm GC outside of the main thread.).

The point is that Boehm&#39;s GC needs to scan every stack in every thread possibly using it.

FWIW, I reported a possible [bug#780815][11] on GTK bugzilla.

A typical example is `gtk+-3.22.11/examples/application9/` from GTK-3.22.11 tarball. `pthread_create` [*is called*][12] very indirectly by `g_application_run` via `g_bus_get_sync`


  [1]: https://www.hboehm.info/gc/
  [2]: https://www-sop.inria.fr/indes/fp/Bigloo/
  [3]: http://www.gnu.org/software/guile
  [4]: https://github.com/ivmai/bdwgc/blob/master/include/gc_pthread_redirects.h#L80
  [5]: https://github.com/ivmai/bdwgc/blob/master/include/gc.h#L1393
  [6]: https://developer.gnome.org/glib/2.52/glib-Memory-Allocation.html#GMemVTable
  [7]: https://developer.gnome.org/glib/2.52/glib-Memory-Allocation.html#g-mem-gc-friendly
  [8]: https://developer.gnome.org/glib/2.52/glib-Threads.html
  [9]: https://developer.gnome.org/gobject/2.52/gobject-Signals.html#g-signal-connect
  [10]: https://developer.gnome.org/gdk3/stable/gdk3-Threads.html
  [11]: https://bugzilla.gnome.org/show_bug.cgi?id=780815
  [12]: https://bugzilla.gnome.org/page.cgi?id=traceparser/trace.html&amp;trace_id=237313

Is recent GTK 3.22 still Boehm GC friendly (thread issue)?

I want to automate generate a pair of ssh key using shell script on Centos7, and I have tried

    yes &quot;y&quot; | ssh-keygen -t rsa
    echo &quot;\n\n\n&quot; | ssh-keygen...
    echo | ssh-keygen..

all of these command doesn&#39;t work, just input one &#39;enter&#39; and the shell script stopped on &quot;Enter passphrase (empty for no passphrase)&quot;,
I just want to know how to simulate mutiple &#39;enter&#39; in shell continuously.

Many thanks if anyone can help !


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