判断当前APP处于前台或者后台

实用方法功能记录！

/**
* 程序是否在前台运行
* 
* @return
*/
public boolean isAppOnForeground() {
// Returns a list of application processes that are running on the
// device


ActivityManager activityManager = (ActivityManager) getApplicationContext()
.getSystemService(Context.ACTIVITY_SERVICE);
String packageName = getApplicationContext().getPackageName();


List<RunningAppProcessInfo> appProcesses = activityManager
.getRunningAppProcesses();
if (appProcesses == null)
return false;


for (RunningAppProcessInfo appProcess : appProcesses) {
// The name of the process that this object is associated with.
if (appProcess.processName.equals(packageName)
&& appProcess.importance == RunningAppProcessInfo.IMPORTANCE_FOREGROUND) {
return true;
}
}
return false;
}

    返回true为前台     返回false为后台