在 Android 中监控网络连接
问题:
如何监控网络变化Android 设备上的连接并捕获网络中断事件?
答案:
要在 Android 中捕获网络中断事件,请按照以下步骤操作:
1。创建广播接收器:
创建一个扩展 BroadcastReceiver 类的新 Java 类:
<code class="java">public class ConnectionChangeReceiver extends BroadcastReceiver { @Override public void onReceive( Context context, Intent intent ) { // Network connectivity change handling code goes here } }</code>
2.注册广播接收器:
将以下 XML 代码添加到
<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>
3。授予权限:
将以下权限添加到
<code class="xml"><uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/></code>
4。处理网络连接更改:
在 ConnectionChangeReceiver 类的 onReceive 方法中,您可以处理网络连接更改。例如,您可以使用以下命令检查活动网络和移动网络信息:
<code class="java">ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService( Context.CONNECTIVITY_SERVICE ); NetworkInfo activeNetInfo = connectivityManager.getActiveNetworkInfo(); NetworkInfo mobNetInfo = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE );</code>
示例代码:
<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>
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