只要互联网无法正常工作，我如何才能重新打开对话框

Question

我的应用程序需要互联网才能工作，所以我正在尝试检查互联网连接是否正常我想在互联网关闭时应用程序向用户显示 dialog 再试一次 按钮，当用户点击 TRY AGAIN 按钮和 interent 连接仍然不起作用显示 Dialog（互联网不起作用再试一次）

检查互联网连接方法：

public Boolean CheckInternetConnection(){
    ConnectivityManager manager = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo networkInfo = manager.getActiveNetworkInfo();
    if(networkInfo != null && networkInfo.isConnected()) {
        return true;
    }
    else
        return false;
}

里面onCreate

 protected void onCreate(){
  ......
  ......
 if(CheckInternetConnection()){
        Toast.makeText(this, "OK", Toast.LENGTH_SHORT).show();
    }
    else{
    AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
        builder.setIcon(R.mipmap.info)
                .setTitle("Internet Connection !")
                .setMessage("No Internet Connection")
                .setNegativeButton("Try Again", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        if(CheckInternetConnection()){

                            //TRY AGAIN and REOPEN DIALOG   



                        }
                    }
                });
        builder.setCancelable(false);
        AlertDialog about = builder.create();
        about.show();
        TextView messageText = (TextView) about.findViewById(android.R.id.message);
        assert messageText != null;
        messageText.setGravity(Gravity.CENTER);
        Button nbutton = about.getButton(DialogInterface.BUTTON_NEGATIVE);
        nbutton.setTextColor(Color.BLACK);

  }

Answer 1

如果连接失败，然后显示 "your connection fail" 之类的对话框，请尝试下面的代码。

主要活动

public class MyActivity implements NetworkStateReceiverListener {
        private NetworkStateReceiver networkStateReceiver;
    }

创建

public void onCreate(Bundle savedInstanceState) {
    /* ... */
    networkStateReceiver = new NetworkStateReceiver();
    networkStateReceiver.addListener(this);
    this.registerReceiver(networkStateReceiver, new IntentFilter(android.net.ConnectivityManager.CONNECTIVITY_ACTION));
}

主要活动

@Override
public void networkAvailable() {
  // internet connection success
}

@Override
public void networkUnavailable() {
      //REOPEN DIALOG           
}

接受者

public class NetworkStateReceiver extends BroadcastReceiver {

    protected List<NetworkStateReceiverListener> listeners;
    protected Boolean connected;

    public NetworkStateReceiver() {
        listeners = new ArrayList<NetworkStateReceiverListener>();
        connected = null;
    }

    public void onReceive(Context context, Intent intent) {
        if(intent == null || intent.getExtras() == null)
            return;

        ConnectivityManager manager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo ni = manager.getActiveNetworkInfo();

        if(ni != null && ni.getState() == NetworkInfo.State.CONNECTED) {
            connected = true;
        } else if(intent.getBooleanExtra(ConnectivityManager.EXTRA_NO_CONNECTIVITY,Boolean.FALSE)) {
            connected = false;
        }

        notifyStateToAll();
    }

    private void notifyStateToAll() {
        for(NetworkStateReceiverListener listener : listeners)
            notifyState(listener);
    }

    private void notifyState(NetworkStateReceiverListener listener) {
        if(connected == null || listener == null)
            return;

        if(connected == true)
            listener.networkAvailable();
        else
            listener.networkUnavailable();
    }

    public void addListener(NetworkStateReceiverListener l) {
        listeners.add(l);
        notifyState(l);
    }

    public void removeListener(NetworkStateReceiverListener l) {
        listeners.remove(l);
    }

    public interface NetworkStateReceiverListener {
        public void networkAvailable();
        public void networkUnavailable();
    }
}

Answer 2

创建 showDialog() 单独的方法并在需要再次显示对话框时调用它。

@Override
protected void onCreate(Bundle savedInstanceState) {
    // ...
    if (isNetworkConnected()) {
        Toast.makeText(this, "OK", Toast.LENGTH_SHORT).show();
    } else {
        showDialog();
    }
}

private void showDialog() {
    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    builder.setCancelable(false);
    builder.setMessage("No Internet Connection");
    builder.setNegativeButton("Try Again", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            if (isNetworkConnected()) {
                Toast.makeText(MainActivity.this, "OK", Toast.LENGTH_SHORT).show();
            } else {
                showDialog();
            }
        }
    });
    AlertDialog alertDialog = builder.create();
    alertDialog.show();
}

只要互联网无法正常工作，我如何才能重新打开对话框

how i can Reopen Dialog long as the Internet does not work

android

dialog

internet-connection