How to remove activity from overview screen?

Question

I am searching from 3 last Days that

How to remove activity from recent list (also known as overview screen, recent app list..etc)

Here is the my android manifest file

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.abc.visibility">
 <uses-permission android:name="android.permission.KILL_BACKGROUND_PROCESSES" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity
            android:name=".MainActivity"
            android:noHistory="true"
            android:taskAffinity=""
            android:excludeFromRecents="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>

Here is the my JavaCode for MainActivity

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
    @Override
    protected void onResume() {super.onResume();}
    public void onWindowFocusChanged(boolean hasFocus) {if (!hasFocus) {clearTask();}}
    void clearTask(){if(android.os.Build.VERSION.SDK_INT >= 21){finishAndRemoveTask();} else{finish();}}
    @Override
    public void onBackPressed() {super.onBackPressed();}

}

So, my question is the simple.....

How to remove my activity from recent list

In my Case : Only one activity

1. Activity needs to started.
2. Once user click on Recent button (Android standard button)
3. it need to finish and needs not show in recent list

I need this much only.

Help me friends if you really know how to do it....

Answer 1

If I right understood and you want to remove your app from list of recent used apps when you press home button or whatever button then you can check this answer.

Answer 2

In your Manifest.xml use this android:autoRemoveFromRecents="true".

      <activity
            android:name=".MainActivity"
            android:autoRemoveFromRecents="true">

In activity Change your code to this format.

public class MainActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

      if(android.os.Build.VERSION.SDK_INT >= 21)
       {
        finishAndRemoveTask();
       }         
      else
        {
         finish();
        }
     }


 public static void exitApplication(Context context)
    {
        Intent intent = new Intent(context, MainActivity.class);

        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NO_ANIMATION | Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);

        context.startActivity(intent);

    }

}

and when os version is Api Level < 21 then use this code to close it.

MainActivity.exitApplication(context);

Hope this will help you.

Answer 3

Using the AppTask class to remove tasks

 public void onRemoveFromRecents(View view) {

finishAndRemoveTask();

}

Retaining finished tasks

If you want to retain a task in the overview screen, even if its activity has finished, pass the FLAG_ACTIVITY_RETAIN_IN_RECENTS flag in the addFlags() method of the Intent that launches the activity.

 private Intent newDocumentIntent() {

       final Intent newDocumentIntent = new Intent(this,        NewDocumentActivity.class);

newDocumentIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_DOCUMENT 

  android.content.Intent.FLAG_ACTIVITY_RETAIN_IN_RECENTS);

newDocumentIntent.putExtra(KEY_EXTRA_NEW_DOCUMENT_COUNTER, 

incrementAndGet());

return newDocumentIntent;

}

here is the link from android docs this is you are demanding] here

 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {

        TypedValue typedValue = new TypedValue();
        Resources.Theme theme = getTheme();
        theme.resolveAttribute(R.attr.colorPrimary, typedValue, true);
        int primaryColor = typedValue.data;

        Bitmap iconBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.ic_activity_welcome);
        ActivityManager.TaskDescription td = new ActivityManager.TaskDescription(null, iconBitmap, primaryColor);

        setTaskDescription(td);
        iconBitmap.recycle();
    }