Android判斷當前應用程序處於前台還是後台

1、通過RunningTaskInfo類判斷（需要額外權限）：

/**
     *判斷當前應用程序處於前台還是後台
     */
    public static boolean isApplicationBroughtToBackground(final Context context) {
        ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
        List tasks = am.getRunningTasks(1);
        if (!tasks.isEmpty()) {
            ComponentName topActivity = tasks.get(0).topActivity;
            if (!topActivity.getPackageName().equals(context.getPackageName())) {
                return true;
            }
        }
        return false;

    }

需要在AndroidMenitfest.xml文件中添加以下權限

public static boolean isBackground(Context context) {

    ActivityManager activityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
    List appProcesses = activityManager.getRunningAppProcesses();
    for (RunningAppProcessInfo appProcess : appProcesses) {
         if (appProcess.processName.equals(context.getPackageName())) {
                if (appProcess.importance == RunningAppProcessInfo.IMPORTANCE_BACKGROUND) {
                          Log.i("後台", appProcess.processName);
                          return true;
                }else{
                          Log.i("前台", appProcess.processName);
                          return false;
                }
           }
    }
    return false;
}