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

Question

Background

I\'m trying to get app-launched statistics, and on Lollipop it\'s possible by using the UsageStatsManager class, as such (original post here):

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Answer 1

The extra check in Chris Li's answer is unnecessary unless you're developing a system app.

When an app is first installed and the user hasn't touched the app's usage access permission, then checkOpNoThrow() returns MODE_DEFAULT.

Chris says we then need to check if the app has the PACKAGE_USAGE_STATS manifest permission:

if (mode == AppOpsManager.MODE_DEFAULT) {
    granted = (context.checkCallingOrSelfPermission(Manifest.permission.PACKAGE_USAGE_STATS) == PackageManager.PERMISSION_GRANTED);
} else {
    granted = (mode == AppOpsManager.MODE_ALLOWED);
}

However, unless your app is a system app, checking this permission always returns PERMISSION_DENIED because it's a signature permission. So you can simplify the code down to this:

if (mode == AppOpsManager.MODE_DEFAULT) {
    granted = false;
} else {
    granted = (mode == AppOpsManager.MODE_ALLOWED);
}

Which you can then simplify down to this:

granted = (mode == AppOpsManager.MODE_ALLOWED);

Which brings us back to the original, simpler solution:

AppOpsManager appOps = (AppOpsManager) context.getSystemService(Context.APP_OPS_SERVICE);
int mode = appOps.checkOpNoThrow(AppOpsManager.OPSTR_GET_USAGE_STATS, Process.myUid(), context.getPackageName());
boolean granted = (mode == AppOpsManager.MODE_ALLOWED);

Tested and verified in Android 5, 8.1 and 9.