監控Android 上的網路狀態變化
問題：如何偵測Android 上網路狀態的變化設備，特別是網路離線時？
為了捕捉網路狀態變化，Android 提供了 BroadcastReceiver 類別。 ConnectivityManager 類別可讓您取得活動網路連線的資訊。
解決方案：
1.建立一個擴充 BroadcastReceiver
<code class="java">public class ConnectionChangeReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetInfo = connectivityManager.getActiveNetworkInfo();
NetworkInfo mobNetInfo = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
if (activeNetInfo != null) {
Toast.makeText(context, "Active Network Type: " + activeNetInfo.getTypeName(), Toast.LENGTH_SHORT).show();
}
if (mobNetInfo != null) {
Toast.makeText(context, "Mobile Network Type: " + mobNetInfo.getTypeName(), Toast.LENGTH_SHORT).show();
}
}
}</code>2 的 Java 類。在AndroidManifest.xml中加入必要的權限
<code class="xml"><uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /></code>
3.在AndroidManifest.xml中註冊BroadcastReceiver
<code class="xml"><receiver android:name="com.blackboard.androidtest.receiver.ConnectionChangeReceiver"
android:label="NetworkConnection">
<intent-filter>
<action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
</intent-filter>
</receiver></code>4.動態註冊BroadcastReceiver（可選）
如果您需要在程式碼中動態註冊BroadcastReceiver，您可以使用以下方法：<code class="java">BroadcastReceiver receiver = new ConnectionChangeReceiver();
IntentFilter filter = new IntentFilter("android.net.conn.CONNECTIVITY_CHANGE");
context.registerReceiver(receiver, filter);</code>以上是如何在 Android 上偵測網路狀態變化和離線事件？的詳細內容。更多資訊請關注PHP中文網其他相關文章！
