Like this:

    #include &lt;android/log.h&gt;
    
    
    __android_log_write(ANDROID_LOG_ERROR, &quot;Tag&quot;, &quot;Error here&quot;);//Or ANDROID_LOG_INFO, ...	

Add it to your makefile like this:

    LOCAL_LDLIBS := -L$(SYSROOT)/usr/lib -llog 


Following is the code snippet that you should include in your native code.

    #include &lt;android/log.h&gt;
    
    
    __android_log_write(ANDROID_LOG_ERROR, &quot;Tag&quot;, &quot;Error msg&quot;);//Or ANDROID_LOG_INFO, ...  

In order to use the above API, we need to link the corresponding library.

We can link a shared library in Android in 3 ways.
In below 3 cases, the lines mentioned should be added in `Android.mk`

So here are the three ways.

    #1. LOCAL_LDLIBS way
    LOCAL_LDLIBS := -llog

For some reason if 1 doesnt work(it did not work for me), You can try below 2 ways

    #2. LOCAL_LDFLAGS way
    LOCAL_LDFLAGS := -llog
    
    #3. LOCAL_SHARED_LIBRARIES way
    LOCAL_SHARED_LIBRARIES += liblog


**`syslog`**

This POSIX function also outputs to logcat.

It has the advantage of being more portable across non Android systems than `__android_log_write` and it automatically adds the app package to the log.

Tested with this example app: https://github.com/cirosantilli/android-cheat/tree/a080f5c370c1f06e74a8300fb4a2e93369861047/gradle/NdkSyslog the NDK source is:

    #include &lt;jni.h&gt;
    #include &lt;string&gt;
    #include &lt;syslog.h&gt;
        
    extern &quot;C&quot;
    JNIEXPORT jstring JNICALL
    Java_com_cirosantilli_android_1cheat_ndksyslog_MainActivity_stringFromJNI(
            JNIEnv* env,
            jobject /* this */) {
        syslog(LOG_CRIT, &quot;hello syslog&quot;);
        return env-&gt;NewStringUTF(&quot;Check adb logcat&quot;);
    }

And logcat now contains:

    01-14 15:39:07.582  3633  3633 E com.cirosantilli.android_cheat.ndksyslog: hello syslog  

Tested on Android O, HiKey 960.

I couldn&#39;t find a way to put a bookmark inside the code in XCode 4. I know about the `#pragma mark` thing but it&#39;s not what I&#39;m looking for. What I need is something that I can put and remove with a mouse click and navigate amongst with next and previous, like in VS.

Is there anything that I&#39;m missing?

How to bookmark code in XCode 4?

Using Razor how/can you write straight text with out wrapping it in some type of html tag?

Example (This works but adds extra span tags):

    @{ var foo = true; }
    @if(foo) { &lt;span&gt;Yes&lt;/span&gt; } else { &lt;span&gt;No&lt;/span&gt; }

I&#39;d like to keep my final markup as clean as possible and not have the extra tags.

Thanks!

MVC 3 Razor Syntax for straight text output?

I would like to debug a JNI C application by inserting log messages to logcat.  What is the C API that does this?


What is the Log API to call from an Android JNI program?

<p>I would like to debug a JNI C application by inserting log messages to logcat.  What is the C API that does this?</p>


I am writing an application for reporting crashes and the relevant logs.
So from my application I am trying to access **traces.txt** and tombstones, but I am getting an error:
 
    03-25 09:48:46.220 W/System.err(10250): java.io.FileNotFoundException: /data/tombstone/tombstone_00 (Permission denied)

I am able to access **traces.txt**, but not tombstones.

how to access android files /data/anr/traces.txt and /data/tombstones/tombstones

When we show an AlertDialog in android it shows in the center of the screen. Is there any way to change the position? 

Show AlertDialog in any position of the screen

I am trying to implement a single-line text view that will scroll automatically. But I unfortunatly cannot get it to work. The AutoScrollTextView is declared inside a LinearLayout (width and height = fill_parent). The class basically uses a Handler that calls itself to scroll by a given amount. I have simplified the code to only show a text view that should be scrolling by 5 pixels every second.

The log output is correct, the getScrollX() method returns the appropriate scrollX position. 

If I don&#39;t call `requestLayout()`, nothing gets drawn. `invalidate()` has no effect.

Would anybody have a clue?


    public class AutoScrollTextView extends TextView {
    
    	public AutoScrollTextView(Context context, AttributeSet attrs, int defStyle) {
    		super(context, attrs, defStyle);
    		setSingleLine();
    		setEllipsize(null);
    		setText(&quot;Single-line text view that scrolls automatically if the text is too long to fit in the widget&quot;);
    	}
    
    	// begin to scroll the text from the original position
    	public void startScrolling() {
    		scrollHandler.sendEmptyMessage(0);
    	}
    
    	private Handler scrollHandler = new Handler() {
    		private static final int REFRESH_INTERVAL = 1000;
    
    		public void handleMessage(Message msg) {
    			scrollBy(5, 0);
    			requestLayout();
    			Log.debug(&quot;Scrolled to &quot; + getScrollX() + &quot; px&quot;);
    			sendEmptyMessageDelayed(0, REFRESH_INTERVAL);
    		}
    	};
    }



Android automatic horizontally scrolling TextView

I want to execute my application offline also, so I need to check if currently an internet connection is available or not. Can anybody tell me how to check if internet is available or not in android? Give sample code. I tried with the code below and checked using an emulator but it&#39;s not working

 

    public  boolean isInternetConnection() 
    { 
    			
        ConnectivityManager connectivityManager =  (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
        return connectivityManager.getActiveNetworkInfo().isConnectedOrConnecting(); 
    } 

Thanks
    	

How to check currently internet connection is available or not in android

I&#39;ve a ScrollView in the PopupWindow. I&#39;m animating ScrollView contents using TranslateAnimation.

When animation starts, the onAnimationStart listener is called but the onAnimationEnd is not getting called. Any ideas ?

Layout :

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
    
    &lt;LinearLayout
       xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
       android:background=&quot;@drawable/popup_window_bg&quot;
       android:layout_width=&quot;match_parent&quot;
       android:layout_height=&quot;wrap_content&quot;&gt;
      &lt;View
         android:layout_width=&quot;@dimen/toolbar_padding_left&quot;
         android:layout_height=&quot;@dimen/toolbar_height&quot;/&gt;
      &lt;ScrollView
         xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
         android:id=&quot;@+web/toolbar&quot;
         android:layout_width=&quot;wrap_content&quot;
         android:layout_height=&quot;wrap_content&quot;
         android:scrollbars=&quot;none&quot;
         android:visibility=&quot;invisible&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;/LinearLayout&gt;
      &lt;/ScrollView&gt;
    &lt;/LinearLayout&gt;

Animation code :
    

    mToolbar = mPopupContents.findViewById( R.web.toolbar );
    TranslateAnimation anim =
        new TranslateAnimation(0, 0, -60, 0);
    anim.setDuration(1000);
    anim.setAnimationListener(new Animation.AnimationListener() {
            public void onAnimationStart(Animation a) {
                Log.d(LOGTAG, &quot;---- animation start listener called&quot;  );
            }
            public void onAnimationRepeat(Animation a) {}
            public void onAnimationEnd(Animation a) {
                Log.d(LOGTAG, &quot;---- animation end listener called&quot;  );
            }
        });
    mToolbar.startAnimation(anim);

**Update** : I verified that the onAnimationEnd is called but it is called after some delay (provided you don&#39;t start the new animation during that time).

onAnimationEnd is not getting called, onAnimationStart works fine

When I try to compile the piece of code below, I get this warning:

`warning: suggest parentheses around assignment used as truth value`

Why does this happen? This is a rather common idiom, I believe. I even use something like it earlier on my code.

    struct PIDList* 
    getRecordForPID(struct PIDList* list, pid_t pid) {
    	while(list = list-&gt;next)
    		if (list-&gt;pid == pid)
    			return list;
    
    	return NULL;
    }


Compiler warning - suggest parentheses around assignment used as truth value

I&#39;ve a little question.
I&#39;m trying to define an array of function pointers dynamically with `calloc`. 
But I don&#39;t know how to write the syntax.
Thanks a lot.

How define an array of function pointers in C

To start you probably know that `const` can be used to make either an object&#39;s data or a pointer not modifiable or both.

```cpp
const Object* obj; // can&#39;t change data
Object* const obj; // can&#39;t change pointer
const Object* const obj; // can&#39;t change data or pointer
```

However you can also use the syntax:

```cpp
Object const *obj; // same as const Object* obj;
````

The only thing that seems to matter is which side of the asterisk you put the `const` keyword.  Personally I prefer to put `const` on the left of the type to specify it&#39;s data is not modifiable as I find it reads better in my left-to-right mindset but which syntax came first?

More importantly why is there two correct ways of specifying `const` data and in what situation would you prefer or need one over the other if any?

Edit:

So it sounds like this was an arbitrary decision when the standard for how compilers should interpret things was drafted long before I was born.  Since `const` is applied to what is to the left of the keyword (by default?) I guess they figured there was no harm in adding _&quot;shortcuts&quot;_ to apply keywords and type qualifiers in other ways at least until such a time as the declaration changes by parsing a * or &amp; ...

This was the case in C as well then I&#39;m assuming?


Const before or const after?

All the time I read sentences like
&gt;don&#39;t rely on 1 byte being 8 bit in size
&gt;
&gt;use `CHAR_BIT` instead of 8 as a constant to convert between bits and bytes

et cetera. What real life systems are there today, where this holds true?
&lt;sub&gt;(I&#39;m not sure if there are differences between C and C++ regarding this, or if it&#39;s actually language agnostic. Please retag if neccessary.)&lt;/sub&gt;

System where 1 byte != 8 bit?

Under what situation is it possible for GCC to **not** throw an &quot;undefined reference&quot; link error message when trying to call made-up functions?

For example, a situation in which this C code is compiled and linked by GCC:

    void function()
    {
        made_up_function_name();
        return;
    }

...even though `made_up_function_name` is not present **anywhere** in the code (not headers, source files, declarations, nor any third party library).

Can that kind of code be accepted and compiled by GCC under certain conditions, without touching the actual code? If so, which?

Thanks.

EDIT: no previous declarations or mentions to `made_up_function_name` are present anywhere else. Meaning that a `grep -R` of the whole filesystem will **only** show that exact single line of code.

Can GCC not complain about undefined references?

I have made a php script inside *localhost* and I am connecting that with `httpClient` but I am getting a problem.

Please tell me how can I connect to a php file at *localhost* from the emulator?

How do you connect localhost in the Android emulator?

I&#39;ve got a few EditText fields in a ListView.  When I tap on one of the EditText fields, the keyboard slides into view (as it should), but the EditText field I tapped loses focus.  I&#39;ve tried using various InputMethodManager methods to make the keyboard start out in view (in order to get around the problem rather than truly solve it), but that didn&#39;t work - the keyboard was not in view when the Activity appeared.

The EditText&#39;s type is `number`, and when the keyboard is sliding in, it is a number keyboard, but when it finishes sliding and the EditText loses focus, it changes to the alphabetical keyboard (which reinforces the idea that the EditText no longer has focus).

My questions are these:

1) How can I make the selection of my EditText field and the subsequent sliding in of the soft keyboard *not* make my EditText lose focus?

... failing that... 

2) How can I make the keyboard start out in view so it never has to slide in (thus avoiding the behavior I find so objectionable)?

My manifest does include `android:windowSoftInputMode=&quot;stateAlwaysVisible&quot;`, but the keyboard does not appear until I tap on an EditText.  This ignoring of the &#39;stateAlwaysVisible&#39; attribute seems to only occur in the emulator - on my provisioned device, it is honored so question number 2 above does work on the device... but not in the emulator.  

Thanks for any help you can provide!

When the soft keyboard appears, it makes my EditText field lose focus

I want to have a transparent background for Android EditText widget. How is that possible?


Android EditText Transparent Background

What can I do in the Android emulator to connect it to my localhost web server page at `http://localhost` or `http://127.0.0.1`?

I&#39;ve tried it, but the emulator still takes my request like a Google search for localhost or worse it says that it didn&#39;t found the page while my web server is normally running.


How to connect to my http://localhost web server from Android Emulator

I have been struggling to upload files from WebView since last few
days and there is no progress. I googled and implemented all suggested
solutions but none works, like: solutions suggested [here](https://stackoverflow.com/questions/4944102/android-webview-file-input),
and so on.

Problem: I have a HTML page with the following code to upload a file.
It works fine in a desktop browser like Firefox and built-in browser
of emulator / AVD i.e., when I click &quot;Browse...&quot; button rendered by
&lt;input type=&quot;file&quot; name=&quot;uploadfile&quot;&gt; element, browser opens a Dialog
box where I can choose a file to upload.

However, in the android 3.0 emulator / AVD, when I click on &quot;Choose
file&quot;, nothing happens, no file dialog is opened!!!

    &lt;form method=&quot;POST&quot; enctype=&quot;multipart/form-data&quot;&gt;
    File to upload: &lt;input type=&quot;file&quot; name=&quot;uploadfile&quot;&gt;&amp;nbsp;&amp;nbsp;
    &lt;input type=&quot;submit&quot; value=&quot;Press to Upload...&quot;&gt; to upload the file!
    &lt;/form&gt;

**Could anyone please suggest a possible solution at the earliest.**


File Upload in WebView

I&#39;m working with my new app which processed captured image from cellphone camera. My phone is Nexus S, 2.3.4.

I create a ARGB_8888 Bitmap with captured data. I know the ndk image lib, but it&#39;s only support 2.2 and above. So I pass the int[] of Bitmap to NDK and found the color byte order is little-endian.

I searched the wiki and found arm architecture is bi-endian.
http://en.wikipedia.org/wiki/Endianness#Bi-endian_hardware

My question is if arm is bi-endian, how to judge the byte order in specific device? Should I test the byte order every time before access the data?



Endianness of Android NDK

I&#39;m trying to build a simple Android application using NDK.
Here are the contents of my Android.mk

    LOCAL_PATH := $(call my-dir)  
      
    include $(CLEAR_VARS)  
      
    LOCAL_LDLIBS := -llog  
      
    LOCAL_MODULE    := myNDK
    LOCAL_SRC_FILES := native.c
      
    include $(BUILD_SHARED_LIBRARY)

And when I&#39;m running ndk-build I get:

&gt; make: *** No rule to make target
&gt; `&#39;/native.c&#39;, needed by
&gt; `&#39;/Users/ivan/Documents/workspace/TestNDK/obj/local/armeabi/objs/myNDK/native.o&#39;.
&gt; Stop.

So the problem is obviously that make is searching the source files in the root directory and if I copy native.c to my root folder everything works perfectly.

The question is: what should I specify in my Android.mk to set the LOCAL_PATH to my working jni folder.

Android NDK: No rule to make target

While there is documentation regarding turning a `jstring` to a native string (`string nativeString = env-&gt;GetStringUTFChars(jStringVariable, NULL);`)  I can&#39;t find an example which will convert a `jboolean` to a `bool` or a `jint` to an `int`. 

Can anyone suggest how this is achieved? 

Convert JNI types to Native types

Is there a preprocessor macro that will let me know NDK is compiling my code? I could manually define my own, but I&#39;d rather not if possible.

How to detect compilation by Android NDK in a C/C++ file?

What is the Android NDK (native development kit) ? How can one use it? Why should one use it?

Content Type	Original Author	Original Content on Stackoverflow
Question	hopia	View Question on Stackoverflow
Solution 1 - Android	Ryan Reeves	View Answer on Stackoverflow
Solution 2 - Android	Sandeep	View Answer on Stackoverflow
Solution 3 - Android	Ciro Santilli Путлер Капут 六四事	View Answer on Stackoverflow

What is the Log API to call from an Android JNI program?

Android Problem Overview

Android Solutions

Solution 1 - Android

Solution 2 - Android

Solution 3 - Android

MVC 3 Razor Syntax for straight text output?

How to bookmark code in XCode 4?

Attributions