无法禁用主页按钮

Question

I am trying to disable home button but getting an error that I don't understand.I have tried many code to disable Home Button but did not got success. This code seems to be better but this error crashes my application. As my application opens and goes to InputPassword Activity it crashes. My homeLockKey code is as follows:

public class HomeKeyLocker {
private OverlayDialog mOverlayDialog;

public void lock(Activity activity) {
    if (mOverlayDialog == null) {
        mOverlayDialog = new OverlayDialog(activity);
        mOverlayDialog.show();
    }
}

public void unlock() {
    if (mOverlayDialog != null) {
        mOverlayDialog.dismiss();
        mOverlayDialog = null;
    }
}

private static class OverlayDialog extends AlertDialog {

    public OverlayDialog(Activity activity) {
        super(activity, R.style.OverlayDialog);
        WindowManager.LayoutParams params = getWindow().getAttributes();
        params.type = TYPE_SYSTEM_ERROR;
        params.dimAmount = 0.0F; // transparent
        params.width = 0;
        params.height = 0;
        params.gravity = Gravity.BOTTOM;
        getWindow().setAttributes(params);
        getWindow().setFlags(FLAG_SHOW_WHEN_LOCKED | FLAG_NOT_TOUCH_MODAL, 0xffffff);
        setOwnerActivity(activity);
        setCancelable(false);
    }

    public final boolean dispatchTouchEvent(MotionEvent motionevent) {
        return true;
    }

    protected final void onCreate(Bundle bundle) {
        super.onCreate(bundle);
        FrameLayout framelayout = new FrameLayout(getContext());
        framelayout.setBackgroundColor(0);
        setContentView(framelayout);
    }
}

My activity is:

public class InputPassword extends AppCompatActivity {
  HomeKeyLocker homeKeyLocker;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_input_password);

    homeKeyLocker = new HomeKeyLocker();
    homeKeyLocker.lock(this);
     }
    }

My logcat is:

    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.rutabaazmat.lockpattern/com.example.rutabaazmat.lockpattern.InputPassword}: android.view.WindowManager$BadTokenException: Unable to add window android.view.ViewRootImpl$W@1abfe808 -- permission denied for this window type
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2521)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2595)
    at android.app.ActivityThread.access$800(ActivityThread.java:178)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1470)
    at android.os.Handler.dispatchMessage(Handler.java:111)
    at android.os.Looper.loop(Looper.java:194)
    at android.app.ActivityThread.main(ActivityThread.java:5631)
    at java.lang.reflect.Method.invoke(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:372)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:959)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:754)
 Caused by: android.view.WindowManager$BadTokenException: Unable to add window android.view.ViewRootImpl$W@1abfe808 -- permission denied for this window type
    at android.view.ViewRootImpl.setView(ViewRootImpl.java:704)
    at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:289)
    at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:85)
    at android.app.Dialog.show(Dialog.java:311)
    at com.example.rutabaazmat.lockpattern.HomeKeyLocker.lock(HomeKeyLocker.java:27)
    at com.example.rutabaazmat.lockpattern.InputPassword.onCreate(InputPassword.java:39)
    at android.app.Activity.performCreate(Activity.java:6092)
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1112)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2468)

Thanks for help in advance:).

Answer 1

Try using this permission in AndroidManifest.

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