android - 监控 Android 服务中的网络连接类型变化

Question

我想捕获 Android 服务中的网络连接类型更改，并在事件触发时运行此服务的代码。如何在没有单独类(class)的情况下仅在服务类(class)中做到这一点？我有这段代码，但它不起作用。

 BroadcastReceiver networkStateReceiver = new BroadcastReceiver() {

        @Override
        public void onReceive(Context context, Intent intent) {
            playlist="NETWORK TYPE CHANGED";
        }
    };

 public void playSong(Context c, String url) {

        try
        {

IntentFilter filter = new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION);        
            registerReceiver(networkStateReceiver, filter);

Answer 1

你的BroadcastReceiver需要接收系统的Intent，所以你需要在你的AndroidManifest中注册你的BroadcastReceiver

<receiver
    android:name=".ConnectivityReceiver
    android:exported="false" >
    <intent-filter>
        <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
    </intent-filter>
</receiver>

不要忘记权限

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />