How to check if “android.permission.PACKAGE_USAGE_STATS” permission is given?

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Special permissions that are granted by the user in the system settings (usage stats access, notification access, …) are handled by AppOpsManager, which was added in Android 4.4.

Note that besides user granting you access in the system settings you typically need a permission in the Android manifest (or some component), without that your app doesn’t even show in the system settings. For usage stats you need android.permission.PACKAGE_USAGE_STATS permission.

There’s not much documentation about that but you can always check Android sources for it.
The solution might seem bit hacky because some constants were added later to the AppOpsManager, and some constants (e.g. for checking different permissions) are still hidden in private APIs.

AppOpsManager appOps = (AppOpsManager) context
        .getSystemService(Context.APP_OPS_SERVICE);
int mode = appOps.checkOpNoThrow("android:get_usage_stats", 
        android.os.Process.myUid(), context.getPackageName());
boolean granted = mode == AppOpsManager.MODE_ALLOWED;

This tells you if the permission was granted by the user.
Note that since API level 21 there is constant AppOpsManager.OPSTR_GET_USAGE_STATS = "android:get_usage_stats".

I tested this check on Lollipop (including 5.1.1) and it works as expected. It tells me whether the user gave the explicit permission without any crash.
There’s also method appOps.checkOp() which might throw a SecurityException.

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