調(diào)用此方法：
//當(dāng)前應(yīng)用是否處于前臺
private boolean isForeground(Context context) {
if (context !=null) {
ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
? ? ? ComponentName cn = am.getRunningTasks(1).get(0).topActivity;
? ? ? String currentPackageName = cn.getPackageName();
? ? ? if (!TextUtils.isEmpty(currentPackageName) && currentPackageName.equals(context.getPackageName())) {
return true;
? ? ? }
return false;
? }
return false;
}
