How to disable the Recent Tasks/Apps button

Question

I\'m building a child play application for Android. I need to disable all keys when it is in use. I have set the Application as the Home App and disabled the back key (that

Answer 1

To the best of my knowledge, you cannot override the behavior of the home button (like the way you can override the behavior of the BACK button) without the user confirming it. In other words, the defaults of the app that currently handles the home button -- which is whatever the current home launcher is -- would have to be cleared first.

Answer 2

You can disable StatusBar popups:

@Override
public void onWindowFocusChanged(boolean hasFocus) {
    super.onWindowFocusChanged(hasFocus);
    try {
        if (!hasFocus) {
            Object service = getSystemService("statusbar");
            Class<?> statusbarManager = Class.forName("android.app.StatusBarManager");
            Method collapse = statusbarManager.getMethod("collapse");
            collapse.setAccessible(true);
            collapse.invoke(service);
        }
    } catch (Exception e) {
        Log.e(TAG, "onWindowFocusChanged - " + e.getCause());
    }
}

Also you should add this permission in AndroidManifest.xml

<uses-permission android:name="android.permission.EXPAND_STATUS_BAR" />

Hope this helps.

Answer 3

Actually, you cannot disable task button. When you press it, your activity calls onPause() method and you can move your task to the front in this method. See my answer for related question.

Answer 4

Have you tried this code?

public void onWindowFocusChanged(boolean hasFocus) {
    super.onWindowFocusChanged(hasFocus);


    Log.d("Focus debug", "Focus changed !");

if(!hasFocus) {
    Log.d("Focus debug", "Lost focus !");

    Intent closeDialog = new Intent(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);
    sendBroadcast(closeDialog);
}
}

From: http://www.juliencavandoli.com/how-to-disable-recent-apps-dialog-on-long-press-home-button/

Answer 5

This will close the RecentActivity dialog. Put it in your activity class.

    @Override
    public void onWindowFocusChanged(boolean hasFocus) {
        super.onWindowFocusChanged(hasFocus);

        if (!hasFocus) {
            windowCloseHandler.postDelayed(windowCloserRunnable, 250);
        }
    }

    private void toggleRecents() {
        Intent closeRecents = new Intent("com.android.systemui.recent.action.TOGGLE_RECENTS");
        closeRecents.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);
        ComponentName recents = new ComponentName("com.android.systemui", "com.android.systemui.recent.RecentsActivity");
        closeRecents.setComponent(recents);
        this.startActivity(closeRecents);
    }

    private Handler windowCloseHandler = new Handler();
    private Runnable windowCloserRunnable = new Runnable() {
        @Override
        public void run() {
            ActivityManager am = (ActivityManager)getApplicationContext().getSystemService(Context.ACTIVITY_SERVICE);
            ComponentName cn = am.getRunningTasks(1).get(0).topActivity;

            if (cn != null && cn.getClassName().equals("com.android.systemui.recent.RecentsActivity")) {
                toggleRecents();
            }
        }
    }

You will need to put the following permission in your manifest.

    <uses-permission android:name="android.permission.GET_TASKS" />