Interfering with the Keyguard
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20-06-2021 - |
题
I am currently working on an app that can draw views over the statusbar.
Here is my code:
@Override
public void onCreate() {
// TODO Auto-generated method stub
super.onCreate();
wm = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
v = new StatusView(this);
lp = new WindowManager.LayoutParams(
WindowManager.LayoutParams.WRAP_CONTENT,
WindowManager.LayoutParams.WRAP_CONTENT,
**WindowManager.LayoutParams.TYPE_STATUS_BAR_PANEL**,
WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
| WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE,
PixelFormat.TRANSLUCENT);
wm.addView(v, lp);
Log.d(TAG, "Added view");
}
However I get a security exception saying I don't have permission to use this view type. So I tried adding several permissions. Here are the ones i've tried so far:
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
<uses-permission android:name="android.permission.INTERNAL_SYSTEM_WINDOW"/>
<uses-permission android:name="android.permission.EXPAND_STATUS_BAR"/>
<uses-permission android:name="android.permission.DISABLE_KEYGUARD"/>
<uses-permission android:name="android.permission.BIND_REMOTEVIEWS"/>
<uses-permission android:name="android.permission.STATUS_BAR"/>
Any suggestions? This may not be possible as the statusbar is not considered part of the window.
EDIT:
The specific error is:
android.view.WindowManager$BadTokenException: unable to add window
android.view.ViewRoot$W@40518c50 - permission denied for this window type
解决方案
Nevermind, I solved it! The problem wasn't TYPE , but FLAGS.
其他提示
In order to draw views on top of the status bar, this is the combinations that worked for me after reading so many Stackoverflow posts:
You need to have WindowManager of this LayoutParameters on either your service or your activity:
WindowManager.LayoutParams params = new WindowManager.LayoutParams(WindowManager.LayoutParams.MATCH_PARENT, statusBarHeight, WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY, WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE | WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN | WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE | WindowManager.LayoutParams.FLAG_FULLSCREEN, PixelFormat.TRANSLUCENT);
You just need this permission on your android manifest:
uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"
Hope that helps. In my case I just needed to tint the statusbar with a tranluscent yellow or green to indicate that user is currently in an active call.