java - 从布局中包含的 ListView 接收字符串。安卓

Question

我正在 Android 上制作聊天应用程序。

这些是一些文件

我正在尝试获取 ListView 中的字符串(名称)。当我单击该名称时，我希望它转到新 Activity ChatBox。我如何获得用户点击的字符串？我在 freindslist.java 中尝试了几次 contactOnClick() 方法，我猜我只需要以某种方式修复它，以便能够按照我想要的方式运行。因为，似乎 contactOnClick() 没有与 ListView 正确连接。

FriendsList.Java:

package com.example.swagmessenger5;

import android.os.Bundle;
import android.app.ListActivity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.EditText;
import android.widget.ListView;

public class FriendsList extends ListActivity {

    ListView listOfContacts;
    static String data;


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

        //create string names
        String[] names = {"tim", "liz" , "ori" , "john" , "bryan","tim", "liz" , "ori" , "john" , "bryan","tim", "liz" , "ori" , "john" , "bryan" };
        //get online status boolean
        boolean[] status = {true, false, true, false, true, true, false, true, false, true,true, false, true, false, true };
        //they should be intertwined, meaning boolean lined up with string.


        MyArrayAdapter adapter = new MyArrayAdapter(this, names, status );
        this.setListAdapter(adapter);

    }



    public void contactOnClick(View view){ //go to chat box with the talker name on top
        //View myLayout = findViewById( R.id.lol );
        listOfContacts = (ListView) findViewById( R.id.lol );  //need to et rigt text

        listOfContacts.setOnItemClickListener(new OnItemClickListener()
        {
          public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,long arg3)
          {
             data = (String)arg0.getItemAtPosition(arg2);
        }});

        Intent intent = new Intent(this, ChatBox.class);
        startActivity(intent);
    }





      //** code to make arrays go forever can keep adding.
/*    public static void main(String[] args) {
            int[] series = {4,2};
            series = addElement(series, 3);
            series = addElement(series, 1);
        }

        static int[] addElement(int[] a, int e) {
            a  = Arrays.copyOf(a, a.length + 1);
            a[a.length - 1] = e;
            return a;
        } */


    public void addfriend(View view){ //go to add friend page
        Intent intent = new Intent(this, AddFriend.class);
        startActivity(intent);
    }



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

}

这是包含在其中的布局。Activity_friends_list.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:text="@string/swag_plus"
        android:onClick="addfriend" />

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@+id/button1"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_toLeftOf="@+id/button1"
        android:paddingTop="10dp"
        android:paddingLeft="10dp"
        android:text="@string/swag_list"
        android:textAppearance="?android:attr/textAppearanceLarge" />

    <include
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_below="@+id/button1"
        layout="@layout/activity_box_in_list_view"
        android:onClick="contactOnClick"
        android:id="@+id/lol" />

</RelativeLayout>

BoxInListView.java

package com.example.swagmessenger5;

import android.os.Bundle;
import android.app.ListActivity;
import android.view.Menu;

public class BoxInListView extends ListActivity {

    //this is the friends list where it will inflate all the friends into the list veiw

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



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

}

这是创建 ListView 的文件。这是包含在 Friendslit xml 中的文件。Activity_box_in_list_view.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_toLeftOf="@+id/imageView1"
        android:padding="15dp"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:textSize="20sp"
        android:textStyle="bold" />

    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:layout_marginRight="14dp"
        android:paddingTop="25dp"/>

    <ListView
        android:id="@android:id/list"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true" >

    </ListView>

</RelativeLayout>

这是我的ArrayAdapter阵列适配器在 box_in_list_view 中膨胀MyArrayAdapter.java

package com.example.swagmessenger5;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;


public class MyArrayAdapter extends ArrayAdapter<String> {
      private Context context;
      private String[] names;
      private boolean[] status;

      public MyArrayAdapter(Context context, String[] names, boolean[] status) {
        super(context, R.layout.activity_box_in_list_view, names);
        this.context = context;
        this.names = names; //names in array
        this.status = status;   //names in status
      }


      public View getView(int position, View convertView, ViewGroup parent) {

        LayoutInflater inflater = (LayoutInflater) context
            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        View rowView = inflater.inflate(R.layout.activity_box_in_list_view, parent, false);

        //Text view
        TextView nameView = (TextView) rowView.findViewById(R.id.textView1);    //set id to text view variable
        ImageView onlineView = (ImageView) rowView.findViewById(R.id.imageView1); //set id to image view variable

        nameView.setText(names[position]);  //set textview(name) of the name in the right position

        // Check the status if online or offline
        boolean online = status[position];

        if (online)     //if online is true, the picture will be set to on
          onlineView.setImageResource(android.R.drawable.button_onoff_indicator_on);
        else            //if online is false, the picture will be set to off
          onlineView.setImageResource(android.R.drawable.button_onoff_indicator_off);

        return rowView;
      }
    } 

Answer 1

为适配器中 getView 内的 View 设置 OnClickListener。另外，您可以将名称设置为 Root View 的标签，以使事情变得更容易。然后你可以在 OnClickListener 中使用这样的代码:

public void onClick(View v){
    String name  = (String)v.getTag();
    doStuffWithName(name);
}