杭州阿里云代理商：android实时监听网络

luotuoemo • 2024年2月28日 08:32 • 阿里云 • 阅读 263

实时监听网络状态需要注册BroadcastReceiver来捕获系统发送的网络变化广播，然后通过判断网络状态实现动态的网络状态展示。具体方法如下：

创建BroadcastReceiver:

public class NetworkStateReceiver extends BroadcastReceiver {
    private static final String TAG = "NetworkStateReceiver";
    @Override
    public void onReceive(Context context, Intent intent) {
        ConnectivityManager manager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo activeNetwork = manager.getActiveNetworkInfo();
        if (activeNetwork != null) {
            if (activeNetwork.isConnected()) {
                Log.d(TAG, "网络连接成功");
            } else {
                Log.d(TAG, "网络连接断开");
            }
        } else {
            Log.d(TAG, "没有可用网络");
        }
    }
}

注册BroadcastReceiver:

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

取消BroadcastReceiver广播:

unregisterReceiver(receiver);

建议在Activity的生命周期方法内注册和取消BroadcastReceiver:

@Override
protected void onResume() {
    super.onResume();
    registerReceiver(receiver, filter);
}

@Override
protected void onPause() {
    super.onPause();
    unregisterReceiver(receiver);
}

以上就是android实时监听网络状态的基本思路。在实际开发中，可以根据需要增加更多的功能，比如判断网络类型、实现网络断开自动重连等。

Android实时监听网络的方法如下：

1.在AndroidManifest.xml文件中添加权限：

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

在Activity中注册BroadcastReceiver：

public class MainActivity extends AppCompatActivity {

    private NetworkStatusReceiver mNetworkStatusReceiver;

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

        // 注册BroadcastReceiver
        mNetworkStatusReceiver = new NetworkStatusReceiver();
        registerReceiver(mNetworkStatusReceiver, new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        // 取消注册BroadcastReceiver
        unregisterReceiver(mNetworkStatusReceiver);
    }

    private class NetworkStatusReceiver extends BroadcastReceiver {

        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            if (action.equals(ConnectivityManager.CONNECTIVITY_ACTION)) {
                ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
                NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
                if (networkInfo != null && networkInfo.isConnected()) {
                    // 网络已连接
                } else {
                    // 网络未连接
                }
            }
        }
    }
}

这时当网络状态发生改变时，BroadcastReceiver会接收到相应的广播并调用onReceive()方法。

注意：一定要记得在Activity销毁时取消注册广播，在Activity中注册的广播只有在Activity处于运行状态时才能接收到广播，因此在不需要监听网络状态时，一定要取消注册，以避免广播泄漏造成不必要的资源占用和安全隐患。