文档只提到“该顺序仅适用于同步消息;异步消息将被忽略。” 这是否意味着 Android 仅查看“有序广播”的优先级?
  <receiver android:name=".receivers.PhoneStateReceiver" >
        <!-- TODO it's supposed to be an un-ordered broadcast -->
        <intent-filter android:priority="99999999999" >
            <action android:name="android.intent.action.PHONE_STATE" />
        </intent-filter>
    </receiver>
...使上述“优先级”无用?