Android异步任务中的网络状态监听

在Android中，我们可以使用ConnectivityManager来监听网络状态变化。以下是一个简单的示例，展示了如何在异步任务中监听网络状态：

1. 首先，创建一个名为NetworkStateReceiver的广播接收器，用于接收网络状态变化的事件：

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo; public class NetworkStateReceiver extends BroadcastReceiver { private OnNetworkStateChangeListener listener; public void setOnNetworkStateChangeListener(OnNetworkStateChangeListener listener) { this.listener = listener;
    } @Override public void onReceive(Context context, Intent intent) { if (intent.getAction().equals(ConnectivityManager.CONNECTIVITY_ACTION)) { ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo(); boolean isConnected = networkInfo != null && networkInfo.isConnectedOrConnecting(); if (listener != null) {
                listener.onNetworkStateChanged(isConnected);
            }
        }
    } public interface OnNetworkStateChangeListener { void onNetworkStateChanged(boolean isConnected);
    }
}

1. 在你的异步任务类中，注册并监听网络状态变化：

import android.content.Context;
import android.content.IntentFilter;
import android.os.AsyncTask; public class MyAsyncTask extends AsyncTask<Void, Void, Void> { private Context context; private NetworkStateReceiver networkStateReceiver; public MyAsyncTask(Context context) { this.context = context;
    } @Override protected void onPreExecute() { super.onPreExecute();
        registerNetworkStateReceiver();
    } @Override protected Void doInBackground(Void... voids) { // 在这里执行你的异步任务 return null;
    } @Override protected void onPostExecute(Void aVoid) { super.onPostExecute(aVoid);
        unregisterNetworkStateReceiver();
    } private void registerNetworkStateReceiver() {
        networkStateReceiver = new NetworkStateReceiver();
        networkStateReceiver.setOnNetworkStateChangeListener(new NetworkStateReceiver.OnNetworkStateChangeListener() { @Override public void onNetworkStateChanged(boolean isConnected) { // 在这里处理网络状态变化 }
        }); IntentFilter intentFilter = new IntentFilter();
        intentFilter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
        context.registerReceiver(networkStateReceiver, intentFilter);
    } private void unregisterNetworkStateReceiver() { if (networkStateReceiver != null) {
            context.unregisterReceiver(networkStateReceiver);
            networkStateReceiver = null;
        }
    }
}

现在，当网络状态发生变化时，onNetworkStateChanged方法将被调用，你可以在这里处理网络状态变化。请注意，不要忘记在异步任务结束时取消注册广播接收器。

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