我如何将一个文本视图从一个片段更新到另一个

问题描述：

我有一个活动"MainActivity"，其中包含两个片段. Fragment1有一个EditText和一个按钮.当用户按下按钮时，EditText中的文本将被发送到仅具有TextView的Fragment2.但是我不太清楚如何将文本从Fragment1中的EditText发送到Fragment2中的TextView.如果有人可以帮忙?感激不尽谢谢片段1

I have an activity "MainActivity" that contains two fragments. Fragment1 has a EditText and a button. When the user presses the button the text inside the EditText will be sent to Fragment2 which only has a TextView. But I can't quite figureout how to send the text from EditText in Fragment1 to TextView in Fragment2. If someone could help? Appreciated. Thanks Fragment1

package org.pctechtips.myfragmentapp;


/**
 * Created by george on 5/16/17.
 */

public class ButtonFragment extends Fragment {

    Button bt;
    EditText editText;
    TextView txtView;

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View view =  inflater.inflate(R.layout.button_fragment,
                container, false);

        txtView = (TextView) view.findViewById(R.id.textView_fragment1);
        editText = (EditText) view.findViewById(R.id.editText_fragment1);


        bt = (Button) view.findViewById(R.id.button_fragment1);
        bt.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                buttonClicked(v);
            }
        });

        return view;
    }

    public void buttonClicked (View view) {
        .onButtonClick(edittext.getText().toString());
    }

}

MainActivity

package org.pctechtips.myfragmentapp;

public class MainActivity extends FragmentActivity {

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

        /*fragments 1 section*/
        FragmentManager fm1 = getFragmentManager();
        FragmentTransaction ft1 = fm1.beginTransaction();
        ButtonFragment bf = new ButtonFragment();
        ft1.add(R.id.button_fragment1, bf);
        ft1.commit();

        /*Fragment 2 section*/
        FragmentManager fm2 = getFragmentManager();
        FragmentTransaction ft2 = fm2.beginTransaction();
        TextviewFragment tf = new TextviewFragment();
        ft2.add(R.id.textView_fragment2, tf);
        ft2.commit();

        }

}

Fragment2

public class TextviewFragment extends Fragment {

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.text_fragment, container, false);
    }
}

答

您可以通过几种方法来做到这一点.例如，通过Activity，例如官方文档.但是，我更喜欢通过LocalBroadcastManager发送广播消息，例如war_Hero :

You can do it by several ways. For example via Activity like in Official Docs. But, I'm prefer send broadcast messages via LocalBroadcastManager like in this answer of war_Hero:

在发送片段中(片段B-您的ButtonFragment)

In Sending Fragment(Fragment B - Your ButtonFragment)

public class FragmentB {

    private void sendMessage() {
      Intent intent = new Intent("custom-event-name");
      intent.putExtra("message", "your message");
      LocalBroadcastManager.getInstance(this).sendBroadcast(intent);
    }
 }

在要接收的消息中，片段(FRAGMENT A-您的TextviewFragment)

And in the Message to be Received Fragment(FRAGMENT A - Your TextviewFragment)

  public class FragmentA {
    @Override
    public void onCreate(Bundle savedInstanceState) {

      ...

      // Register receiver
      LocalBroadcastManager.getInstance(this).registerReceiver(receiver,
          new IntentFilter("custom-event-name"));
    }

//    This will be called whenever an Intent with an action named "custom-event-name" is broadcasted.
    private BroadcastReceiver receiver = new BroadcastReceiver() {
      @Override
      public void onReceive(Context context, Intent intent) {
        String message = intent.getStringExtra("message");
      }
    };
}

别忘了取消注册接收者:

And don't forget to unregister receiver:

protected void onPause() {
  super.onPause();
  LocalBroadcastManager.getInstance(this).unregisterReceiver(receiver);
}

我如何将一个文本视图从一个片段更新到另一个

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