android动态注册断网,android动态注册监听网络变化异常

Android动态注册监听网络变化的方式是通过创建BroadcastReceiver来实现，然后在Manifest文件中添加相应的权限和声明。以下是一个简单的示例：

1. 创建BroadcastReceiver类

public class NetworkChangeReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        if (isNetworkAvailable(context)) {
            // 网络连接可用
        } else {
            // 网络连接不可用
        }
    }

    private boolean isNetworkAvailable(Context context) {
        ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
        return networkInfo != null && networkInfo.isConnected();
    }
}

2. 在Manifest中声明相应的权限和BroadcastReceiver

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

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

3. 在Activity中注册BroadcastReceiver

private NetworkChangeReceiver networkChangeReceiver;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    // 动态注册BroadcastReceiver
    IntentFilter intentFilter = new IntentFilter();
    intentFilter.addAction("android.net.conn.CONNECTIVITY_CHANGE");
    networkChangeReceiver = new NetworkChangeReceiver();
    registerReceiver(networkChangeReceiver, intentFilter);
}

@Override
protected void onDestroy() {
    super.onDestroy();
    // 注销BroadcastReceiver
    unregisterReceiver(networkChangeReceiver);
}

但是需要注意的是，如果使用动态注册方式监听网络变化，需要在Activity的onDestroy方法中注销BroadcastReceiver，否则会导致内存泄漏。

如果出现异常，可以先检查是否添加了相应的权限和声明，并且是否正确注册和注销BroadcastReceiver。另外，也可以尝试使用静态注册的方式来监听网络变化。