始终检查在线连接 Returns True

Question

我在我的 Main Activity 中设置了一个动态广播接收器，只要我的网络状态发生变化，它就会显示 Toast 消息。我在线连接，运行应用程序，显示 "You are online!" Toast 消息，然后我关闭笔记本电脑上的互联网，导航回我的 Main Activity，我一直得到相同的 "You are online!"吐司。我正在检查我的日志语句，我的 NetworkInfo 对象不断返回我确实在线，而我显然不在线。我在我的模拟器和 phone 上试过这个。有谁知道为什么？

这是我的 Main Activity，其中包含我的嵌套广播接收器 Class、Intent 过滤器和执行 Toast 的方法：

public class MainActivity extends AppCompatActivity {
private IntentFilter onlineIntentFilter;
private CheckOnlineReceiver checkOnlineReceiver;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    onlineIntentFilter = new IntentFilter();
    checkOnlineReceiver = new CheckOnlineReceiver();
    onlineIntentFilter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);

    }


@Override
protected void onResume() {
    super.onResume();
    registerReceiver(checkOnlineReceiver, onlineIntentFilter);
}

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


public void isNetworkAvailable() {
    ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo networkInfo = cm.getActiveNetworkInfo();
    Log.v("TAG", "NETWORK INFO =========== " + networkInfo);
    if (networkInfo != null && networkInfo.isConnected()) {
        Toast.makeText(this,"You Are Online!",Toast.LENGTH_LONG).show();
    }else{
        Toast.makeText(this,"You Are Not Online!",Toast.LENGTH_LONG).show();
    }
}
private class CheckOnlineReceiver extends BroadcastReceiver{

    @Override
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        boolean stateChanged = (action.equals(ConnectivityManager.CONNECTIVITY_ACTION));
        if (stateChanged){
            isNetworkAvailable();
        }
    }
}}

Answer 1

您是否尝试关闭模拟器上的 WiFi，看看会发生什么？ networkInfo.isConnected() 不检查 Internet。这只是意味着有一个活动连接。

Answer 2

我会这样做：

private class CheckOnlineReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        Log.d(TAG, "onReceive action: " + intent.getAction());
        Log.d(TAG, "onReceive component: " + intent.getComponent());
        NetworkInfo networkInfo = intent.getParcelableExtra(ConnectivityManager.EXTRA_NETWORK_INFO);
        stateChanged = networkInfo != null && networkInfo.isConnectedOrConnecting();

    if (stateChanged) {
        Toast.makeText(this,"You Are Online!",Toast.LENGTH_LONG).show();
    }else{
        Toast.makeText(this,"You Are Not Online!",Toast.LENGTH_LONG).show();
       }
    }
}

用以下内容替换您的接收者代码：

registerReceiver(
            checkOnlineReceiver,
            new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION)
    );

始终检查在线连接 Returns True

Checking Online Connectivity Always Returns True

android

broadcastreceiver

android-connectivitymanager