I have seen Kioware and SureLock applications. They simply block every control in tablet. I'm aware about overriding back button and handling the home and recent task options as well. But I'm not sure how they managed to control the setting option on system bar. Settings appear for a fraction of seconds and then disappear. In the same way Statusbar of mobile which appear on swipe down need to be block.
If anyone have idea about it please share it. Any guidance/help is appreciated.
You can try to add a transparent View at desidered position using the WindowManager (follow this example). In this way, you will intercept any tap events from the user.
Be sure to set the proper flags/type, because you need to overlay the system bars:
WindowManager.LayoutParams dismissParams = new WindowManager.LayoutParams(
viewWidth,
viewHeight,
WindowManager.LayoutParams.TYPE_SYSTEM_ALERT, //you can also try with TYPE_SYSTEM_OVERLAY, TYPE_SYSTEM_ERROR
WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE | WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS,
PixelFormat.TRANSPARENT);
The trick is to add transparent custom view that overlays on the system bar, that way all user interaction like touch, drag will be consumed by the custom view.
Here is a working code:
windowManager = (WindowManager) getSystemService(WINDOW_SERVICE);
activityManager = (ActivityManager) getSystemService(ACTIVITY_SERVICE);
statusBarOverlay = new CustomViewGroup(this);
final WindowManager.LayoutParams localLayoutParams =
new WindowManager.LayoutParams();
localLayoutParams.type = WindowManager.LayoutParams.TYPE_SYSTEM_ERROR;
localLayoutParams.gravity = Gravity.TOP;
localLayoutParams.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE |
// this is to enable the notification to receive touch events
WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL |
// Draws over status bar
WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN;
localLayoutParams.width = WindowManager.LayoutParams.MATCH_PARENT;
localLayoutParams.height =
(int) (50 * getResources().getDisplayMetrics().scaledDensity);
localLayoutParams.format = PixelFormat.TRANSPARENT;
windowManager.addView(statusBarOverlay, localLayoutParams);
Custom ViewGroup:
public class CustomViewGroup extends ViewGroup {
public CustomViewGroup(Context context) {
super(context);
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
return true;
}
}
I myself have done locking feature to my app though I have separated the locking feature into a different app for many reasons. You can ask for more information and I will put them here if necessary.
Finally I found the solution of the above problem. onWindowFocus change I just closed the system generated Dialogs and my problem was solved. below is the sample code.
@Override
public void onWindowFocusChanged(boolean hasFocus) {
super.onWindowFocusChanged(hasFocus);
if(!hasFocus)
{// Close every kind of system dialog
Intent closeDialog = new Intent(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);
sendBroadcast(closeDialog);
}
}
Update:
In Mobile to block the status bar which appear on swipe down on the screen use below way.
private Handler collapseNotificationHandler;
@Override
public void onWindowFocusChanged(boolean hasFocus) {
boolean currentFocus = hasFocus;
if (!hasFocus) {
collapseNow(true,currentFocus);
}
}
public void collapseNow(final boolean shouldCollapse, final boolean currentFocus ) {
// Initialize 'collapseNotificationHandler'
if (collapseNotificationHandler == null) {
collapseNotificationHandler = new Handler();
}
// If window focus has been lost && activity is not in a paused state
// Its a valid check because showing of notification panel
// steals the focus from current activity's window, but does not
// 'pause' the activity
if (!currentFocus && !isPaused) {
// Post a Runnable with some delay - currently set to 50 ms
collapseNotificationHandler.postDelayed(new Runnable() {
@Override
public void run() {
// Use reflection to trigger a method from 'StatusBarManager'
Object statusBarService = getSystemService("statusbar");
Class<?> statusBarManager = null;
try {
statusBarManager = Class.forName("android.app.StatusBarManager");
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
Method collapseStatusBar = null;
try {
// Prior to API 17, the method to call is 'collapse()'
// API 17 onwards, the method to call is `collapsePanels()`
if (Build.VERSION.SDK_INT > 16) {
collapseStatusBar = statusBarManager.getMethod("collapsePanels");
} else {
collapseStatusBar = statusBarManager.getMethod("collapse");
}
} catch (NoSuchMethodException e) {
e.printStackTrace();
}
collapseStatusBar.setAccessible(shouldCollapse);
try {
collapseStatusBar.invoke(statusBarService);
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
}
// Check if the window focus has been returned
// If it hasn't been returned, post this Runnable again
// Currently, the delay is 50 ms. You can change this
// value to suit your needs.
if (!currentFocus && !isPaused) {
collapseNotificationHandler.postDelayed(this, 50);
}
}
}, 0);
}
}
"isPaused" boolean which set true when app is in Pause state.