The documentations say this:

&gt;Historically these methods were faster than the equivalent double-based
java.lang.Math methods. On versions of Android with a JIT they
became slower and have since been re-implemented to wrap calls to
java.lang.Math. java.lang.Math should be used in preference.

&gt;All methods were removed from the public API in version 23.

&gt;@deprecated Use java.lang.Math instead.

This means the solution is to use the Math class:

    (float)Math.sqrt(...)

When I have a target API of 23 on Android M Preview 3, I cannot seem to acquire the Manifest.permission.WRITE_SETTTINGS permission. 

    requestPermissions(new String[]{Manifest.permission.WRITE_SETTINGS}, 101);


Request permission doesn&#39;t bring up the dialog I would expect, but if I make the following call without this permission,

     RingtoneManager.setActualDefaultRingtoneUri(activity, RingtoneManager.TYPE_RINGTONE, ringUri);
 
The call will except because I don&#39;t have the permission.

I&#39;m not sure where to go from here. Is there a new ringtone API for 23? Or did this permission change just make it impossible for any non-system apps to change the ringtone?

Can&#39;t get WRITE_SETTINGS permission

I want my table list to have a swipe-able menu like in iOS 8 (first introduced in iOS 7).

[![Screenshot of table view cell action buttons][1]][1]


I&#39;ve found [a Ray Wenderlich guide that is clear][2] on how to do it, but it was written a year and 4 months ago and the code is in Objective-C.

Did iOS 8 or the upcoming iOS 9 finally include this function in Apple&#39;s SDK? I know they made the &quot;swipe to reveal delete function&quot; built-in years ago. I don&#39;t want to waste my time implementing patched-together code to mimic the iOS 8 mail function, if Apple&#39;s new iOS is going to hand it to me in a neatly wrapped package.

  [1]: http://i.stack.imgur.com/hXG0t.png
  [2]: http://www.raywenderlich.com/62435/make-swipeable-table-view-cell-actions-without-going-nuts-scroll-views

Swipe-able Table View Cell in iOS 9

I&#39;m using the new Android Marshmallow SDK and the method `FloatMath.sqrt()` is gone. What should I use now?

Method FloatMath.sqrt() not found

<p>I'm using the new Android Marshmallow SDK and the method <code>FloatMath.sqrt()</code> is gone. What should I use now?</p>


I have a RecyclerView. Each row has a play button, textview and Progressbar. when click on the play button have to play audio from my sdcard and have to progress Progressbar
The problem is when i scroll down the recyclerview change the Progressbar in next row.means  I can fit 5 items on the screen at once. When I scroll to the 6th, 6th row seekbar changes suddenly.


    
    public class ListAdapter extends RecyclerView.Adapter {
    
        private List&lt;Historyitem&gt; stethitems;
        public Context mContext;
        public Activity activity;
        public Handler mHandler;
    
        static MediaPlayer mPlayer;
        static Timer mTimer;
    
        public ListAdapter(Activity activity,Context mContext,List&lt;Historyitem&gt; stethitems) {
            this.stethitems = stethitems;
            this.mContext = mContext;
            this.activity = activity;
        }
    
        @Override
        public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
    
            View rootView = LayoutInflater.
                    from(mContext).inflate(R.layout.stethoscopeadapteritem, null, false);
            RecyclerView.LayoutParams lp = new RecyclerView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
                    ViewGroup.LayoutParams.WRAP_CONTENT);
            rootView.setLayoutParams(lp);
            mHandler = new Handler();
            return new MyViewHolder(rootView);
        }
    
        @Override
        public void onBindViewHolder(final RecyclerView.ViewHolder viewHolder, int position) {
    
            final Historyitem dataItem = stethitems.get(position);
            final MyViewHolder myViewHolder = (MyViewHolder) viewHolder;
            myViewHolder.progressplay.setProgress(0);
            myViewHolder.stethdatetime.setText(dataItem.getReported_Time());
            myViewHolder.stethhosname.setText(dataItem.getdiv());
    
            if(dataItem.getPatient_Attribute().replaceAll(&quot; &quot;,&quot;&quot;).equals(&quot;&quot;)){
                myViewHolder.stethdoctorname.setText(dataItem.getunit());
            } else {
                myViewHolder.stethdoctorname.setText(dataItem.getPatient_Attribute());
            }
    
            myViewHolder.stethstreamplay.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                   
                       FileDownload(dataItem.getmsg(),
                                myViewHolder.progressplay);
                 
                }
            });
        }
    
        @Override
        public int getItemCount() {
    
            return stethitems.size();
        }
      
        public class MyViewHolder extends RecyclerView.ViewHolder {
    
            final CustomTextRegular stethdatetime;
            final CustomTextView stethhosname;
            final CustomTextBold stethdoctorname;
            final ImageButton stethstreamplay;
            final NumberProgressBar progressplay;
    
            public MyViewHolder(View itemView) {
                super(itemView);
              
                stethdatetime = (CustomTextRegular)
                        itemView.findViewById(R.id.stethdatetime);
                stethhosname = (CustomTextView)
                        itemView.findViewById(R.id.stethhosname);
                stethdoctorname = (CustomTextBold)
                        itemView.findViewById(R.id.stethdoctorname);
                stethstreamplay = (ImageButton)
                        itemView.findViewById(R.id.stethstreamplay);
                progressplay= (NumberProgressBar)
                        itemView.findViewById(R.id.progressplay);
                
    
            }
        }
        public void  FileDownload(final String downloadpath,
                                         
                                         final NumberProgressBar progressplay) {
    
            new AsyncTask&lt;NumberProgressBar, Integer, NumberProgressBar&gt;() {
                NumberProgressBar progress;
                @Override
                protected void onPreExecute() {
                    super.onPreExecute();
                    try {
                        if(mPlayer!=null){
                            mPlayer.stop();
                        }
                    }catch (Exception e){
                    }
                    try {
                        if(mTimer != null){
                            mTimer.purge();
                            mTimer.cancel();
                        }
                    }catch (Exception e){
                    }
                }
    
                @Override
                protected NumberProgressBar doInBackground(NumberProgressBar... params) {
                    int count;
                    progress = progressplay;
                    try {
                       
                        final List&lt;NameValuePair&gt; list = new ArrayList&lt;NameValuePair&gt;();
                        list.add(new BasicNameValuePair(&quot;pid&quot;,id));
    
                        URL url = new URL(Config.requestfiledownload + &quot;?path=&quot; +
                                downloadpath);
                        URLConnection connection = url.openConnection();
                        connection.connect();
    
                        int lenghtOfFile = connection.getContentLength();
                        // download the file
                        InputStream input = new BufferedInputStream(url.openStream());
                        OutputStream output = new FileOutputStream(Environment.getExternalStorageDirectory() +
                                &quot;record.wav&quot;);
                        byte data[] = new byte[1024];
                        long total = 0;
                        while ((count = input.read(data)) != -1) {
                            total += count;
                            // publishing the progress....
                            publishProgress((int) (total * 100 / lenghtOfFile));
                            output.write(data, 0, count);
                        }
                        output.flush();
                        output.close();
                        input.close();
                    } catch (Exception e) {
                       
                    }
                    return progress;
                }
                @Override
                protected void onPostExecute(final NumberProgressBar numberProgressBar) {
                    super.onPostExecute(numberProgressBar);
                  
                            try {
                                StartMediaPlayer(numberProgressBar);
                            } catch (Exception e){
                                e.printStackTrace();
                            }
                        
                }
            }.execute();
        }
    
        public void StartMediaPlayer(final NumberProgressBar progressbar){
            Uri playuri = Uri.parse(&quot;file:///sdcard/record.wav&quot;);
            mPlayer = new MediaPlayer();
            mPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
            mPlayer.reset();
            try {
                mPlayer.setDataSource(mContext, playuri);
            } catch (IllegalArgumentException e) {
                
            } catch (SecurityException e) {
               
            } catch (IllegalStateException e) {
                
            } catch (Exception e) {
               
            }
            try {
                mPlayer.prepare();
            } catch (Exception e) {
               
            }
    
            mPlayer.start();
            progressbar.setMax(mPlayer.getDuration());
            mPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
                @Override
                public void onCompletion(MediaPlayer mp) {
                    if(mPlayer!=null) {
                        mPlayer.release();
                        progressbar.setProgress(0);
                    }
                    if(mTimer != null){
                        mTimer.purge();
                        mTimer.cancel();
                    }
                }
            });
            mTimer = new Timer();
            mTimer.schedule(new TimerTask() {
                @Override
                public void run() {
                    mHandler.post(new Runnable() {
                        @Override
                        public void run() {
                            progressbar.setProgress(mPlayer.getCurrentPosition());
                        }
                    });
                }
            },0,500);
        }}

Recyclerview Changing Items During Scroll

An example usage:

[![enter image description here][1]][1]

The Spinner is dark themed, but I want the dropdown to be light themed.


  [1]: http://i.stack.imgur.com/wNEvY.png

How do I set a different theme for a Spinner&#39;s dropdown?

I&#39;m trying out the new data binding library. I have a weird issue where binding the `visibility` property is not compiling.

This is a simplified version of the xml file:

    &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;&gt;

	    &lt;data&gt;

		&lt;variable
		    name=&quot;header&quot;
		    type=&quot;com.example.EmailHeader&quot; /&gt;
	    &lt;/data&gt;

	    &lt;RelativeLayout ... &gt;

		    &lt;TextView
		        ...
		        android:text=&quot;@{header.senderName ?? header.senderAddress}&quot;
		        android:visibility=&quot;@{header.hasAttachment ? View.VISIBLE : View.INVISIBLE}&quot; /&gt;

	    &lt;/RelativeLayout&gt;
	&lt;/layout&gt;

I get the follow message when compiling:

    Error:Execution failed for task &#39;:app:compileDebugJavaWithJavac&#39;.
&gt; java.lang.RuntimeException: Found data binding errors.
  ****/ data binding error ****msg:Identifiers must have user defined types from the XML file. View is missing it

Everything compiles (and works!) when I remove the `android:visiblity` declaration.

I don&#39;t see what I&#39;m missing here

Data binding expression not compiling

Together with the M release, there are new support libraries. One of them that seems to be very useful is the [v7 Preference Support][1] library. 

It does not seem to have `PreferenceActivity` or something similar, how do we integrate it to our app?

  [1]: http://developer.android.com/tools/support-library/features.html#v7-preference

How to use the v7/v14 Preference Support library?

With the new PreferenceFragmentCompat from the v7 Preference Support Library: http://developer.android.com/tools/support-library/features.html#v7-preference, I get this error

    E  java.lang.IllegalStateException: Must specify preferenceTheme in theme
    E      at android.support.v7.preference.PreferenceFragmentCompat.onCreate(PreferenceFragmentCompat.java:202)

What theme should be set?

**Update:** I have tried using

`&lt;item name=&quot;preferenceTheme&quot;&gt;@style/PreferenceThemeOverlay&lt;/item&gt;`

as suggested by @Bogato but it doesn&#39;t look right and looks very Holo even on Lollipop.

Support library:

[![enter image description here][1]][1]

Native preferences:

[![enter image description here][2]][2]


  [1]: http://i.stack.imgur.com/aQNaS.png
  [2]: http://i.stack.imgur.com/sjyFZ.png

PreferenceFragmentCompat requires preferenceTheme to be set

In Android Marshmallow, permissions should be requested at runtime when they are needed, instead of all at once when an app is installed. However, I can only seem to request permissions from an Activity, which is a problem since my app contains only Services. (Why is that, you might ask? The app has an Android Wear watch face bundled inside, and all the phone does is look up photos nearby to send to the watch - no Activity needed. But it does require location permissions.)

So, is there any way to request permissions from a Service? Or somehow force the permissions to be granted at install time as in the past?

How to request permissions from a Service in Android Marshmallow

Whenever my device (Nexus 5, Android M Preview 3) connects via USB, the USB config always defaults to &quot;charging only&quot;. 

This is quite problematic because the USB port on my device is faulty and sometimes disconnects and reconnects when bumped and so I have to manually change the mode to MTP (media transfer protocol) from the notification drawer each time.

- Debugging mode is enabled
- Develop settings -&gt; USB Configuration is set to MTP.

How to set Android M default USB config to MTP rather than &quot;charging only&quot;?

I was going through the official doc about the new Permissions model in Android M. It talks about the `shouldShowRequestPermissionRationale()` function which returns `true` if the app has requested this permission previously and the user denied the request. If the user turned down the permission request in the past and chose the Don&#39;t ask again option, this method returns `false`. 

 
But how can we differentiate between the following two cases?

&lt;b&gt;Case 1&lt;/b&gt;: The app doesn&#39;t have a permission and the user has not been asked for the permission before. In this case, shouldShowRequestPermissionRationale() will return false because this is the first time we&#39;re asking the user.

&lt;b&gt;Case 2&lt;/b&gt;: The user has denied the permission and selected &quot;Don&#39;t ask again&quot;, in this case too shouldShowRequestPermissionRationale() will return false. 

I would want to send the user to the App&#39;s settings page in Case 2. How do i go about differentiating these two cases?﻿

Android M Permissions : Confused on the usage of shouldShowRequestPermissionRationale() function

Is there any way I can launch an intent to get to Android&#39;s notification settings screen for my app (pictured below)? Or an easy way I can make a PreferenceScreen item that just leads here on a click?

[![enter image description here][1]][1]


  [1]: http://i.stack.imgur.com/Kqe73.png

Content Type	Original Author	Original Content on Stackoverflow
Question	rekire	View Question on Stackoverflow
Solution 1 - Android	rekire	View Answer on Stackoverflow

Method FloatMath.sqrt() not found

Android Problem Overview

Android Solutions

Solution 1 - Android

Swipe-able Table View Cell in iOS 9

Can't get WRITE_SETTINGS permission

Attributions