分别使用simpleAdapter和baseAdapter为ListView的Item添加按钮响应事件

其他 2018-08-30 11:42:57 阅读次数: 0
版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/a13570320979/article/details/46850337

       昨天在ListView Item上添加ImageButton时，发现item点击没响应，上网查找时发现有的文章认为不能使用simpleAdapter为ListView的item添加按钮响应事件，有的则认为simpleAdapter可以。下面一起解决这两个问题：

1.亲测可以分别使用simpleAdapter和baseAdapter为ListView的Item添加按钮响应事件。

（1）使用simpleAdapter为listView的item添加按钮响应事件

         MainActivity.java

package com.example.arrayadapter;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import android.widget.Toast;


/**
 * 继承simpleAdapter实现listView每个Item上面的按钮添加事件
 *
 */
public class MainActivity extends Activity {
	
	private ListView lv ;       //声明一个列表
	/* 显示ListView的两种方法：
     * 1)在activity对应的布局里声明ListView控件，使用findViewById初始listView对象，最后listView.setAdapter显示listVIew
     * 2)直接初始化ListVIew = new ListView(this),setAdapter后，通过setContentView(listView)把listView显示出来
     */
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        lv = (ListView)findViewById(R.id.listview) ;       
//        lv = new ListView(this) ;
        //String[]的img 要和int[]的img名称一致
        MySimpleAdapter adapter = new MySimpleAdapter(this,getData(),R.layout.item,
        		new String[]{"view1","view2","img","imageButton"},
        		new int[]{R.id.view1,R.id.view2,R.id.img,R.id.imageButton}) ;
        
        lv.setAdapter(adapter) ;
//        setContentView(lv) ;
        
        //添加监听器
      lv.setOnItemClickListener(new OnItemClickListener(){

			@Override
			public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
					long arg3) {
				// TODO Auto-generated method stub
				Toast.makeText(MainActivity.this, "点击的是ListView的item："+arg2, Toast.LENGTH_LONG).show() ;
			}
      	
      }) ;
        
    }


    private ArrayList<Map<String,Object>> getData()
    {
    	ArrayList<Map<String,Object>> data = new ArrayList<Map<String,Object>>() ;
    	Map<String,Object> item ;
    	item = new HashMap<String,Object>() ;
    	item.put("view1", "张三") ;
    	item.put("view2", "23") ;
    	item.put("img", R.drawable.ic_launcher) ;
    	item.put("imageButton", R.drawable.ic_launcher) ;
    	data.add(item) ;
    	item = new HashMap<String,Object>() ;
    	item.put("view1", "李四") ;
    	item.put("view2", "20") ;
    	item.put("img", R.drawable.ic_launcher) ;
    	item.put("imageButton", R.drawable.ic_launcher) ;
    	data.add(item) ;
    	return data ;
    }
    @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();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}
        MySimpleAdapter.java 

package com.example.arrayadapter;

import java.util.List;
import java.util.Map;

import android.content.Context;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.ImageButton;
import android.widget.SimpleAdapter;
import android.widget.Toast;

public class MySimpleAdapter extends SimpleAdapter {

	Context context ;
	public MySimpleAdapter(Context context,
			List<? extends Map<String, ?>> data, int resource, String[] from,
			int[] to) {
		super(context, data, resource, from, to);
		this.context = context ; 
		// TODO Auto-generated constructor stub
	}

	/* (non-Javadoc)
	 * @see android.widget.SimpleAdapter#getView(int, android.view.View, android.view.ViewGroup)
	 */
	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
		// TODO Auto-generated method stub
		View view= super.getView(position, convertView, parent);
		   ImageButton btn=(ImageButton) view.findViewById(R.id.imageButton);
		   btn.setTag(position);
		   btn.setOnClickListener(new OnClickListener() {
		    
		    @Override
		    public void onClick(View v) {
		     // TODO Auto-generated method stub
		     Toast.makeText(getApplicationContext(), "点击的是ImageButton"+v.getTag(), 1).show();
		    }
		   });
		   return view;
	}

	protected Context getApplicationContext() {
		// TODO Auto-generated method stub
		return context;
	}

	
}
         activity_main.xml 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.arrayadapter.MainActivity" >

    <!-- 点击ListView item空白地方没响应的原因：ListView的layout_width设置为“wrap_content”,应该为fill_parent或match_parent -->
    <ListView  
        android:id="@+id/listview"  
        android:layout_width="match_parent"  
        android:layout_height="fill_parent" >  
    </ListView>  

</LinearLayout>
         item.xml 
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:descendantFocusability="blocksDescendants"
    android:orientation="horizontal" >

    <ImageView
        android:id="@+id/img"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/ic_launcher" />

    <LinearLayout
        android:layout_width="174dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:orientation="vertical" >

        <TextView
            android:id="@+id/view1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="view1" />

        <TextView
            android:id="@+id/view2"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="view2" />
    </LinearLayout>

    <ImageButton
        android:id="@+id/imageButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:clickable="true"
        android:focusable="false"
        android:gravity="right"
        android:src="@drawable/ic_launcher" />

</LinearLayout>


（2）使用baseAdapter为listView的item添加按钮响应事件

        MainActivity.java

 package com.example.listviewdemo;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;


/**
 * @author Devel_000
 *使用baseAdapter为listView的item添加按钮响应事件
 */
public class MainActivity extends Activity {

	private ListView lv ;       //声明一个列表
	ArrayList<Map<String,Object>> listData ;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        lv = (ListView)findViewById(R.id.listview) ;
        listData = getData() ;
        MyAdapter myAdapter = new MyAdapter(this,listData) ;
        lv.setAdapter(myAdapter) ;
        
      //添加监听器
        lv.setOnItemClickListener(new OnItemClickListener(){

  			@Override
  			public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
  					long arg3) {
  				// TODO Auto-generated method stub
  				Toast.makeText(MainActivity.this, "点击的是ListView的item："+arg2, Toast.LENGTH_LONG).show() ;
  			}
        	
        }) ;
    }


    //Item的内容
    private ArrayList<Map<String,Object>> getData()
    {
    	ArrayList<Map<String,Object>> data = new ArrayList<Map<String,Object>>() ;
    	Map<String,Object> item ;
    	item = new HashMap<String,Object>() ;
    	item.put("view1", "张三") ;
    	item.put("view2", "23") ;
    	item.put("img", R.drawable.ic_launcher) ;
    	item.put("imageButton", R.drawable.ic_launcher) ;
    	data.add(item) ;
    	item = new HashMap<String,Object>() ;
    	item.put("view1", "李四") ;
    	item.put("view2", "20") ;
    	item.put("img", R.drawable.ic_launcher) ;
    	item.put("imageButton", R.drawable.ic_launcher) ;
    	data.add(item) ;
    	return data ;
    }
    
    @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();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}
     MyAdapter.java 

package com.example.listviewdemo;

import java.util.ArrayList;
import java.util.Map;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

public class MyAdapter extends BaseAdapter {

	private LayoutInflater mInflater ;
	private ArrayList<Map<String,Object>> listData ;
	private Context context ;
	public MyAdapter(Context context,ArrayList<Map<String,Object>> listData)
	{
		mInflater = LayoutInflater.from(context) ;
		this.listData = listData ;
		this.context = context ;
	}
	@Override
	public int getCount() {
		// TODO Auto-generated method stub
		return listData.size() ;
	}

	@Override
	public Object getItem(int arg0) {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public long getItemId(int arg0) {
		// TODO Auto-generated method stub
		return 0;
	}

	//这里arg0被定义为final是java语法规范（Cannot refer to a non-final variable arg0 inside an inner class defined in a different method）
	@Override
	public View getView(final int arg0, View arg1, ViewGroup arg2) {
		// TODO Auto-generated method stub
		ViewHolder holder = null ;
		if(arg1 == null)
		{
			holder = new ViewHolder() ;
			arg1 = mInflater.inflate(R.layout.item, null);
			//需要为每个控件指定内容，如指定textView的显示文字（这就是引用的listData作用）
            holder.imageButton = (ImageButton)arg1.findViewById(R.id.imageButton) ;
            holder.imageView = (ImageView)arg1.findViewById(R.id.img) ;
            holder.textView1 = (TextView)arg1.findViewById(R.id.view1) ;
            holder.textView1.setText(listData.get(arg0).get("view1").toString()) ;
            holder.textView2 = (TextView)arg1.findViewById(R.id.view2) ;
            holder.textView2.setText(listData.get(arg0).get("view2").toString()) ;
			arg1.setTag(holder) ;
		}
		else
		{
			holder = (ViewHolder)arg1.getTag();
		}
		
		holder.imageButton.setOnClickListener(new OnClickListener(){  
			  
            @Override  
            public void onClick(View v) {  
                // TODO Auto-generated method stub  
            	 Toast.makeText(getApplicationContext(), "点击的是ImageButton "+arg0, 1).show();
            }});
		return arg1;
	}

	protected Context getApplicationContext() {
		// TODO Auto-generated method stub
		return context;
	}

	public class ViewHolder
	{
		public ImageView imageView ;
		public TextView textView1 ;
		public TextView textView2 ;
		public ImageButton imageButton ;
	}
}
        activity_main.xml 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.arrayadapter.MainActivity" >

    <!-- 点击ListView item空白地方没响应的原因：ListView的layout_width设置为“wrap_content”,应该为fill_parent或match_parent -->
    <ListView  
        android:id="@+id/listview"  
        android:layout_width="match_parent"  
        android:layout_height="fill_parent" >  
    </ListView>  

</LinearLayout>
        item.xml 
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:descendantFocusability="blocksDescendants"
    android:orientation="horizontal" >

    <ImageView
        android:id="@+id/img"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/ic_launcher" />

    <LinearLayout
        android:layout_width="174dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:orientation="vertical" >

        <TextView
            android:id="@+id/view1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="view1" />

        <TextView
            android:id="@+id/view2"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="view2" />
    </LinearLayout>

    <ImageButton
        android:id="@+id/imageButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:clickable="true"
        android:focusable="false"
        android:gravity="right"
        android:src="@drawable/ic_launcher" />

</LinearLayout>

运行截图：


在此过程中可能会遇到的问题（上述代码是可正常运行的，没有问题的）：

1.为listView添加button等控件时，点击item没响应：

解决方法：在ListView的Item的xml文件中添加如下属性：

                1）整个xml文件的根元素如LinearLayout中添加属性android:descendantFocusability="blocksDescendants"

                2）被点击的控件如ImageButton中添加属性android:focusable="false"和android:clickable="true"

2.点击listView item中的空白地方没响应：

解决方法：在含ListView的布局中将listView的layout_width设置为fill_parent或match_parent,而不是“wrap_content”

仅供参考



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