How can I detect user pressing HOME key in my acti

Question

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• Detect home button press in android 14 answers

Can you please tell me how can my activity detect user pressing HOME key?

Thank you.

Answer 1

It can be done(uptil 2.3 atleast). Tested on android version 2.3.5 non-rooted HTC WildFire-S. Code snippet to catch/disable all the control keys :

@Override
public void onAttachedToWindow() {
    super.onAttachedToWindow();        
    this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD);


}

public boolean onKeyDown(int keyCode, KeyEvent event) {     

    if(keyCode == KeyEvent.KEYCODE_HOME || keyCode == KeyEvent.KEYCODE_POWER || keyCode == KeyEvent.KEYCODE_BACK || keyCode == KeyEvent.KEYCODE_MENU || keyCode == KeyEvent.KEYCODE_SEARCH  )
    {

       Toast.makeText(getApplicationContext(),"You pressed a control button with keyCode : " + keyCode, Toast.LENGTH_SHORT).show();
       return false;

    }
    else
    {
        Toast.makeText(getApplicationContext(),"You pressed" + keyCode, Toast.LENGTH_SHORT).show();
    }

    return true;
}

public boolean onKeyUp(int keyCode, KeyEvent event) {     

    if(keyCode == KeyEvent.KEYCODE_HOME || keyCode == KeyEvent.KEYCODE_POWER || keyCode == KeyEvent.KEYCODE_BACK || keyCode == KeyEvent.KEYCODE_MENU || keyCode == KeyEvent.KEYCODE_SEARCH  )
    {

       return false;

    }
    else
    {
        // Do nothing
    }

    return true;
}

Answer 2

You can detect a HOME button press via Activity.onUserLeaveHint(). This method is called in two situations; when the user presses HOME and when a new activity is started. Make sure to somehow differenciate between the two.

Answer 3

use onUserLeaveHint() method in your Activity

@Override
protected void onUserLeaveHint()
{
   super.onUserLeaveHint();
}

http://developer.android.com/reference/android/app/Activity.html#onUserLeaveHint()

Answer 4

android.text.method.KeyListener.onKeyDown([view],[text],KEYCODE_HOME,[event])

I'm not sure how the other parameters fit in, or even how to implement the above, but the info is all at the keylistner documentation.

But they also mention at another page that the home key ALWAYS goes home, you can't change that. So if you plan on having some kind of "are you sure you want to quit" dialog, that wouldn't work.

Answer 5

You can write a Broadcast listener and set the filter to

<category android:name="android.intent.category.HOME" />

From the Broadcast receiver start ur activity/ notify the activity.

Answer 6

public boolean isApplicationSentToBackground(final Context context) {
        ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
        List<RunningTaskInfo> tasks = am.getRunningTasks(1);
        if (!tasks.isEmpty()) {
            ComponentName topActivity = tasks.get(0).topActivity;
            if (!topActivity.getPackageName().equals(context.getPackageName())) {
                return true;
            }
        }
        return false;
    }



 public void onPause() {
    super.onPause();
    if(isApplicationSentToBackground(this))
    {
        Log.i("Home", "Home Pressed..!");
    }
 }