Android高级控件系列之ListView的用法

效果图：

布局代码：

<?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>

<?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>

注意：如果 不写android:descendantFocusability="blocksDescendants"的话，就会有文字点击没有效果了

Java代码：

ItemTag：

package com.zking.laci.android08;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;}

package com.zking.laci.android08;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;        }    }}