Question

我希望在互联网关闭时显示全屏图像，以便用户无法使用该应用，因为他没有互联网连接。我想使用像这样的广播接收器：

public class ConnectivityChangeReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {

        Bundle extras = intent.getExtras();
        if (extras != null)
            if (extras.get("EXTRA_NO_CONNECTIVITY") == true) {
              //show splash screen
            }

    }
}

if指令为true时显示启动画面。

请告诉我这是否正确以及如何显示启动画面。

Answer 1

你走在正确的轨道上。这就是你如何做到的：

1：如果网络发生变化，则创建带有回调的NetworkChangeReceiver

public class NetworkChangeReceiver extends BroadcastReceiver {
private NetworkLostCallback mNetworkLostCallback;

public interface NetworkLostCallback {
    public void onNetworkLost();
    public void onNetworkRegained();
}

public void setNetworkLostCallback(NetworkLostCallback callback) {
    mNetworkLostCallback = callback;
}

@Override
public void onReceive(final Context context, final Intent intent) {
    if (mNetworkLostCallback != null) {
        ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo activeNetwork = cm.getActiveNetworkInfo();

        if (activeNetwork != null
                && (activeNetwork.getType() == ConnectivityManager.TYPE_MOBILE || activeNetwork.getType() == ConnectivityManager.TYPE_WIFI)) {
            mNetworkLostCallback.onNetworkRegained();
        } else {
            mNetworkLostCallback.onNetworkLost();
        }
    }
}

}

2：注册接收器和回调

mNetworkChangeReceiver = new NetworkChangeReceiver();
mNetworkChangeReceiver.setNetworkLostCallback(this);

IntentFilter networkFilter = new IntentFilter();
networkFilter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);

getActivity().registerReceiver(mNetworkChangeReceiver, networkFilter);

3：监听更改并在网络丢失时显示对话框。

public void onNetworkLost() {
    Fragment f = getFragmentManager().findFragmentByTag(DisconnectedDialog.class.getSimpleName());
    if (f == null) {
        DisconnectedDialog dialog = DisconnectedDialog.newInstance();
        dialog.setCancelable(false);
        dialog.show(getFragmentManager(), DisconnectedDialog.class.getSimpleName());
    }
}

完成。

如果您打开对话框或其他活动，则取决于您。

如何在互联网连接关闭时显示启动画面？ Android的

1 个答案: