Check if my application has usage access enabled

Detecting when the usage access changes

Use this class to be notified when your app is granted or revoked usage access.

@TargetApi(Build.VERSION_CODES.LOLLIPOP)
public class UsagePermissionMonitor {

    private final Context context;
    private final AppOpsManager appOpsManager;
    private final Handler handler;
    private boolean isListening;
    private Boolean lastValue;

    public UsagePermissionMonitor(Context context) {
        this.context = context;
        appOpsManager = (AppOpsManager) context.getSystemService(Context.APP_OPS_SERVICE);
        handler = new Handler();
    }

    public void startListening() {
        appOpsManager.startWatchingMode(AppOpsManager.OPSTR_GET_USAGE_STATS, context.getPackageName(), usageOpListener);
        isListening = true;
    }

    public void stopListening() {
        lastValue = null;
        isListening = false;
        appOpsManager.stopWatchingMode(usageOpListener);
        handler.removeCallbacks(checkUsagePermission);
    }

    private final AppOpsManager.OnOpChangedListener usageOpListener = new AppOpsManager.OnOpChangedListener() {
        @Override
        public void onOpChanged(String op, String packageName) {
            // Android sometimes sets packageName to null
            if (packageName == null || context.getPackageName().equals(packageName)) {
                // Android actually notifies us of changes to ops other than the one we registered for, so filtering them out
                if (AppOpsManager.OPSTR_GET_USAGE_STATS.equals(op)) {
                    // We're not in main thread, so post to main thread queue
                    handler.post(checkUsagePermission);
                }
            }
        }
    };

    private final Runnable checkUsagePermission = new Runnable() {
        @Override
        public void run() {
            if (isListening) {
                int mode = appOpsManager.checkOpNoThrow(AppOpsManager.OPSTR_GET_USAGE_STATS, Process.myUid(), context.getPackageName());
                boolean enabled = mode == AppOpsManager.MODE_ALLOWED;

                // Each change to the permission results in two callbacks instead of one.
                // Filtering out the duplicates.
                if (lastValue == null || lastValue != enabled) {
                    lastValue = enabled;

                    // TODO: Do something with the result
                    Log.i(UsagePermissionMonitor.class.getSimpleName(), "Usage permission changed: " + enabled);
                }
            }
        }
    };

}

Credits

Based on code from epicality in another answer.

Here's my all-around solution for this (based on similar question and answer here) :

public static PermissionStatus getUsageStatsPermissionsStatus(Context context) {
    if (VERSION.SDK_INT < VERSION_CODES.LOLLIPOP)
        return PermissionStatus.CANNOT_BE_GRANTED;
    AppOpsManager appOps = (AppOpsManager) context.getSystemService(Context.APP_OPS_SERVICE);
    final int mode = appOps.checkOpNoThrow(AppOpsManager.OPSTR_GET_USAGE_STATS, android.os.Process.myUid(), context.getPackageName());
    boolean granted = mode == AppOpsManager.MODE_DEFAULT ?
            (context.checkCallingOrSelfPermission(android.Manifest.permission.PACKAGE_USAGE_STATS) == PackageManager.PERMISSION_GRANTED)
            : (mode == AppOpsManager.MODE_ALLOWED);
    return granted ? PermissionStatus.GRANTED : PermissionStatus.DENIED;
}

public enum PermissionStatus {
    GRANTED, DENIED, CANNOT_BE_GRANTED
}

I previously used the same code as Bao Le, but I've run into the problem that certain devices (e.g. VF-895N) report usage stats as enabled even when they're not. As a workaround I've modified my code like this:

public static boolean hasPermission(@NonNull final Context context) {
    // Usage Stats is theoretically available on API v19+, but official/reliable support starts with API v21.
    if (VERSION.SDK_INT < VERSION_CODES.LOLLIPOP) {
        return false;
    }

    final AppOpsManager appOpsManager = (AppOpsManager) context.getSystemService(Context.APP_OPS_SERVICE);

    if (appOpsManager == null) {
        return false;
    }

    final int mode = appOpsManager.checkOpNoThrow(AppOpsManager.OPSTR_GET_USAGE_STATS, android.os.Process.myUid(), context.getPackageName());
    if (mode != AppOpsManager.MODE_ALLOWED) {
        return false;
    }

    // Verify that access is possible. Some devices "lie" and return MODE_ALLOWED even when it's not.
    final long now = System.currentTimeMillis();
    final UsageStatsManager mUsageStatsManager = (UsageStatsManager) context.getSystemService(Context.USAGE_STATS_SERVICE);
    final List<UsageStats> stats = mUsageStatsManager.queryUsageStats(UsageStatsManager.INTERVAL_DAILY, now - 1000 * 10, now);
    return (stats != null && !stats.isEmpty());
}

Successfully tested on multiple devices.

Received a great answer by someone on Twitter, tested working:

try {
   PackageManager packageManager = context.getPackageManager();
   ApplicationInfo applicationInfo = packageManager.getApplicationInfo(context.getPackageName(), 0);
   AppOpsManager appOpsManager = (AppOpsManager) context.getSystemService(Context.APP_OPS_SERVICE);
   int mode = appOpsManager.checkOpNoThrow(AppOpsManager.OPSTR_GET_USAGE_STATS, applicationInfo.uid, applicationInfo.packageName);
   return (mode == AppOpsManager.MODE_ALLOWED);

} catch (PackageManager.NameNotFoundException e) {
   return false;
}