Android 判断app是不是在前台还是在后台运行

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=100				GONE=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;	}