Check if your Android app is in foreground or background

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In this example I will explain how to check if your Android Application is running in foreground or it is in background.

Note: we do not need to add any permission for this code. we will be using ActivityManager class
and its method getRunningAppProcesses()
getRunningAppProcesses() Returns a list of application processes that are running on the device.

Also I am using AsyncTask because we should not call ActivityManager.getRunningAppProcesses()
from UI thread it will return importance IMPORTANCE_FOREGROUND for your task no matter whether it is actually in the foreground or not.

 private class CheckIfForeground extends AsyncTask<Void, Void, Void> {
    @Override
    protected Void doInBackground(Void... voids) {

        ActivityManager activityManager = (ActivityManager) mContext.getSystemService(Context.ACTIVITY_SERVICE);
        List<ActivityManager.RunningAppProcessInfo> appProcesses = activityManager.getRunningAppProcesses();
        for (ActivityManager.RunningAppProcessInfo appProcess : appProcesses) {
            if (appProcess.importance == ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND) {
                Log.i("Foreground App", appProcess.processName);

                if (mContext.getPackageName().equalsIgnoreCase(appProcess.processName)) {
                    Log.i(Constants.TAG, "foreground true:" + appProcess.processName);
                    foreground = true;
                    // close_app();
                }
            }
        }
        Log.d(Constants.TAG, "foreground value:" + foreground);
        if (foreground) {
            foreground = false;
            close_app();
            Log.i(Constants.TAG, "Close App and start Login Activity:");

        } else {
            //if not foreground
            close_app();
            foreground = false;
            Log.i(Constants.TAG, "Close App");

        }

        return null;
    }
}

and execute AsyncTask like this.

new CheckIfForeground().execute();

Please Note this code is tested on Android Version 5.0.2

Author:

Hammad Tariq

Android Developer