Android控件之ListView

来源：互联网发布：intent 获取数据编辑：程序博客网时间：2024/04/17 02:27

实现代码：

xml:

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<span style="font-size:18px;"><?xml version="1.0" encoding="utf-8"?>    
<LinearLayout    
    xmlns:android="http://schemas.android.com/apk/res/android"    
    xmlns:app="http://schemas.android.com/apk/res-auto"    
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"    
    android:layout_height="match_parent" tools:context="com.zking.laci.android08.MainActivity">    
    
    <ListView    
        android:layout_width="match_parent"    
        android:layout_height="wrap_content"    
        android:id="@+id/lv_list"    
        android:layout_weight="1"    
        ></ListView>    
    
    
</LinearLayout>  </span>  

注意：如果不写Android:descendantFocusability="blocksDescendants",ListView的点击事件就会和Button的点击事件冲突，只出现Button的点击效果

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<span style="font-size:18px;"><?xml version="1.0" encoding="utf-8"?>    
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    
    android:orientation="horizontal" android:layout_width="match_parent"    
    android:layout_height="match_parent"    
    android:descendantFocusability="blocksDescendants"    
    >    
    
    <ImageView    
        android:layout_width="wrap_content"    
        android:layout_height="wrap_content"    
        android:id="@+id/res_iv"    
        />    
    <TextView    
        android:layout_width="0dp"    
        android:layout_height="wrap_content"    
        android:layout_weight="1"    
        android:id="@+id/res_tv"    
        android:text="xx"    
        />    
    <Button    
        android:layout_width="wrap_content"    
        android:layout_height="wrap_content"    
        android:text="下载"    
        android:id="@+id/res_bt"    
        />    
</LinearLayout> </span>  

Java:

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<span style="font-size:18px;">    
import android.widget.Button;    
import android.widget.ImageView;    
import android.widget.TextView;    
    
/**   
 * Created by Laci on 2017/6/9.   
 */    
    
public class ItemTag {    
    public ImageView iv;    
    public TextView tv;    
    public Button bt;    
}  </span>  

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<span style="font-size:18px;">import android.support.v7.app.AppCompatActivity;    
import android.os.Bundle;    
import android.view.View;    
import android.view.ViewGroup;    
import android.widget.AdapterView;    
import android.widget.BaseAdapter;    
import android.widget.Button;    
import android.widget.ImageView;    
import android.widget.ListView;    
import android.widget.SimpleAdapter;    
import android.widget.TextView;    
import android.widget.Toast;    
    
import java.util.ArrayList;    
import java.util.HashMap;    
import java.util.List;    
import java.util.Map;    
    
public class MainActivity extends AppCompatActivity {    
    private ListView lv;    
    private int images[]={R.drawable.bird,R.drawable.cat,R.drawable.chicken};    
    private String titles[]={"小鸟","猫猫","火鸡"};    
    private Button bt;    
    
    @Override    
    protected void onCreate(Bundle savedInstanceState) {    
        super.onCreate(savedInstanceState);    
        setContentView(R.layout.activity_main);    
    
        lv= (ListView) findViewById(R.id.lv_list);    
        lv.setAdapter(new MyAdapter());    
        lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {    
            @Override    
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {    
                Toast.makeText(MainActivity.this, "跳转到"+titles[position%titles.length], Toast.LENGTH_SHORT).show();    
            }    
        });    
    
    }    
    class MyAdapter extends BaseAdapter{    
    
        //指定的view有多少个    
        @Override    
        public int getCount() {    
            return 1000;    
        }    
    
        //内容    
        @Override    
        public Object getItem(int position) {    
            return titles[position%titles.length];    
        }    
    
        //每一行的下标    
        @Override    
        public long getItemId(int position) {    
            return position;    
        }    
    
        //拿到每一行的view    
        @Override    
        public View getView(final int position, View convertView, ViewGroup parent) {    
            //把布局文件转成view    
            if(convertView==null){    
                convertView=getLayoutInflater().inflate(R.layout.res,null);    
                //实例化自己写的实体类    
                ItemTag it=new ItemTag();    
                it.iv= (ImageView) convertView.findViewById(R.id.res_iv);    
                it.tv= (TextView) convertView.findViewById(R.id.res_tv);    
                it.bt= (Button) convertView.findViewById(R.id.res_bt);    
                convertView.setTag(it);    
            }    
            ItemTag itg= (ItemTag) convertView.getTag();    
    
            //设置    
            itg.iv.setImageResource(images[position%titles.length]);    
            itg.tv.setText(titles[position%titles.length]);    
            itg.bt.setOnClickListener(new View.OnClickListener() {    
                @Override    
                public void onClick(View v) {    
                    Toast.makeText(MainActivity.this, "状态下载"+titles[position%titles.length], Toast.LENGTH_SHORT).show();    
                }    
            });    
            return convertView;    
        }    
    }    
}  </span>  

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