Android 判断app是否在前台还是在后台运行，，直接看代码，可直接使用。
public static boolean isBackground(Context context) {ActivityManager activityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);List<RunningAppProcessInfo> appProcesses = activityManager.getRunningAppProcesses();for (RunningAppProcessInfo appProcess : appProcesses) {if (appProcess.processName.equals(context.getPackageName())) {/*BACKGROUND=400 EMPTY=500 FOREGROUND=100GONE=1000 PERCEPTIBLE=130 SERVICE=300 ISIBLE=200*/Log.i(context.getPackageName(), "此appimportace ="+ appProcess.importance+ ",context.getClass().getName()="+ context.getClass().getName());if (appProcess.importance != RunningAppProcessInfo.IMPORTANCE_FOREGROUND) {Log.i(context.getPackageName(), "处于后台"+ appProcess.processName);return true;} else {Log.i(context.getPackageName(), "处于前台"+ appProcess.processName);return false;}}}return false;}
总结成功的经验能够让人越来越聪明，
