EditText 字段得到不正确的输出

Question

所以，我有这个测试应用程序，我试图让两个片段通过 MainActivity 进行通信。经过一些研究，我设法将数据从 MainFragment 传递到 FragmentTwo。但是，每当我从 MainFragment 传递字符串值时，我都会收到一条消息说

"android.support.v7.widget.AppCompatEditText{cce883f VFED ..... app:id/editText}"

我找不到这个案例的问题所在。请帮忙。顺便说一句，我知道如何使用意图，并且它们比片段更灵活（有时），但这只是为了让我知道片段可以走多远。

这是我的 MainActivity

import android.app.FragmentManager;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.NavigationView;
import android.support.design.widget.Snackbar;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;

public class    MainActivity extends AppCompatActivity
    implements NavigationView.OnNavigationItemSelectedListener,                     MainFragment.OnHeadlineSelectedListener {

private String dataReceiver;



@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                    .setAction("Action", null).show();
        }
    });

    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
            this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
    drawer.setDrawerListener(toggle);
    toggle.syncState();

    NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
    navigationView.setNavigationItemSelectedListener(this);


}

@Override
public void sendInformations(String message) {
    FragmentTwo fragmentTwo = new FragmentTwo();
    Bundle args = new Bundle();
    args.putString(fragmentTwo.DATA_RECEIVE, message);
    fragmentTwo.setArguments(args);
    getFragmentManager().beginTransaction()
            .replace(R.id.container, fragmentTwo)
            .commit();
}

@Override
public void onBackPressed() {
    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    if (drawer.isDrawerOpen(GravityCompat.START)) {
        drawer.closeDrawer(GravityCompat.START);
    } else {
        super.onBackPressed();
    }
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}

@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {

    FragmentManager fragmentManager = getFragmentManager();

    int id = item.getItemId();

    if (id == R.id.frag_one) {
        fragmentManager.beginTransaction().replace(R.id.container, new FragmentOne()).commit();
    } else if (id == R.id.frag_two) {
        fragmentManager.beginTransaction().replace(R.id.container, new FragmentTwo()).commit();
    } else if (id == R.id.frag_three) {
        fragmentManager.beginTransaction().replace(R.id.container, new FragmentThree()).commit();
    } else if (id == R.id.frag_four) {
        fragmentManager.beginTransaction().replace(R.id.container, new FragmentFour()).commit();
    } else if (id == R.id.main_frag) {
        fragmentManager.beginTransaction().replace(R.id.container, new MainFragment()).commit();


    } else if (id == R.id.nav_share) {

    } else if (id == R.id.nav_send) {

    }

    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    drawer.closeDrawer(GravityCompat.START);
    return true;
}
}

主要片段class

import android.app.Activity;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;


public class MainFragment extends Fragment   {
OnHeadlineSelectedListener mCallback;
Button sendData;


public interface OnHeadlineSelectedListener {
    public void sendInformations(String message);
}

@Override
public void onAttach(Activity activity) {
    super.onAttach(activity);


    try {
        mCallback = (OnHeadlineSelectedListener) activity;
    } catch (ClassCastException e) {
        throw new ClassCastException(activity.toString()
                + " must implement OnHeadlineSelectedListener");
    }
}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

    View rootView = inflater.inflate(R.layout.main_fragment, container, false);

    final EditText userInput = (EditText) rootView.findViewById(R.id.editText);
    sendData = (Button) rootView.findViewById(R.id.button);


    sendData.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (v.getId() == R.id.button) {
                mCallback.sendInformations(userInput.toString());
            }
        }
    });

    return rootView;
}
}

片段二class

import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;



public class FragmentTwo extends Fragment {
final static String DATA_RECEIVE = "data_receive";
TextView textView;
String input;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

    View rootView = inflater.inflate(R.layout.fragment_two, container, false);
    textView = (TextView) rootView.findViewById(R.id.data_receiver2);
    savedInstanceState = getArguments();
    if(savedInstanceState != null) {
        input = savedInstanceState.getString(DATA_RECEIVE);
    }
    textView.setText(input);
    return rootView;
}
}

哦，我收到的消息是当我运行应用程序在文本字段中输入内容并按下按钮时，我收到了奇怪的消息。如果有人能告诉我是什么导致了奇怪的输出，我将不胜感激..

如果这是我在某些相关情况下注意到的错误，是否是因为我弃用了 v7.Fragment & v7.FragmentManager？

Answer 1

您基本上是将 EditText 作为字符串传递，而不是 EditText 值。

在您的 MainFragment 中将 mCallback.sendInformations(userInput.toString()); 更改为 mCallback.sendInformations(userInput.getText().toString());

sendData.setOnClickListener(new View.OnClickListener() {
     @Override
     public void onClick(View v) {
         if (v.getId() == R.id.button) {
             mCallback.sendInformations(userInput.getText().toString());
         }
     }
 });

EditText 字段得到不正确的输出

EditText field gets an incorrect output

java

android-fragments

android-studio

fragmentmanager

android-bundle