android - 我应该在Android的每个 Activity 中检查连接性吗？

因此，我只是实现了一种检查连通性的方法，但是我应该对每个活动都这样做吗？有没有更简单的方法来持续检查连接性？

public static boolean isNetworkAvailable(Context context) {

    ConnectivityManager cm =
            (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);

    NetworkInfo activeNetwork = cm.getActiveNetworkInfo();

    boolean isConnected = activeNetwork != null &&
            activeNetwork.isConnectedOrConnecting();

    return isConnected;
}

最佳答案

首先创建一个ConnectivityChangeReceiver，如下所示：

public class ConnectivityChangeReceiver extends BroadcastReceiver {

    private OnConnectivityChangedListener listener;

    public ConnectivityChangeReceiver(OnConnectivityChangedListener listener) {
        this.listener = listener;
    }

    @Override
    public void onReceive(Context context, Intent intent) {
        ConnectivityManager connectivityManager = (ConnectivityManager)
                context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo activeNetInfo = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
        boolean isConnected = activeNetInfo != null && activeNetInfo.isConnectedOrConnecting();
        listener.onConnectivityChanged(isConnected);
    }

    public interface OnConnectivityChangedListener {
        void onConnectivityChanged(boolean isConnected);
    }
}

然后创建一个BaseActivity扩展您的所有活动：

public class BaseActivity extends Activity implements OnConnectivityChangedListener {

    private ConnectivityChangeReceiver connectivityChangeReceiver;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        connectivityChangeReceiver = new ConnectivityChangeReceiver(this);
        IntentFilter filter = new IntentFilter();
        filter.addAction("android.net.conn.CONNECTIVITY_CHANGE");
        registerReceiver(connectivityChangeReceiver, filter);
    }

    @Override
    public void onConnectivityChanged(boolean isConnected) {
        // TODO handle connectivity change
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        unregisterReceiver(connectivityChangeReceiver);
    }
}

（如果不想使用BaseActivity，则可以在所有活动中实现OnConnectivityChangedListener。但是在这种情况下，您必须在所有Activity中注册接收者。）

关于android - 我应该在Android的每个 Activity 中检查连接性吗？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/30018171/