android判断应用是否在后台运行的方法

 //检查应用是否在后台运行public static boolean isBackground(Context context) {ActivityManager activityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);KeyguardManager keyguardManager = (KeyguardManager) context.getSystemService(KEYGUARD_SERVICE);List<ActivityManager.RunningAppProcessInfo> appProcesses = activityManager.getRunningAppProcesses();for (ActivityManager.RunningAppProcessInfo appProcess : appProcesses) {if (TextUtils.equals(appProcess.processName, context.getPackageName())) {boolean isBackground = (appProcess.importance != ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND && appProcess.importance != ActivityManager.RunningAppProcessInfo.IMPORTANCE_VISIBLE);boolean isLockedState = keyguardManager.inKeyguardRestrictedInputMode();return isBackground || isLockedState;}}return false;}