Android 判断当前程序是否在前台运行

public boolean isRunningForeground(Context context){
ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
List<ActivityManager.RunningAppProcessInfo> list = am.getRunningAppProcesses();

int myPid = android.os.Process.myPid();
for (ActivityManager.RunningAppProcessInfo info: list){
if (myPid == info.pid) {
if (ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND==info.importance){
return true;
}
}
}
return false;
}