Android課程---最佳化ListView列表視圖

標籤：

activity_ui4.xml

<?xml version="1.0" encoding="utf-8"?><ListView xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:id="@+id/sa_1"></ListView>

layout_simple.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="wrap_content">    <ImageView        android:layout_width="70dp"        android:layout_height="70dp"        android:src="@drawable/yuantu"        android:id="@+id/lv2"/>    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:orientation="vertical"        android:layout_gravity="center_vertical"        android:layout_marginLeft="20dp">        <TextView            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="美食圖片"            android:id="@+id/tv1"/>        <TextView            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="很好吃啊"            android:id="@+id/tv2"/>    </LinearLayout></LinearLayout>

UIActivity4.java

package com.hanqi.test5;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.widget.ListView;import android.widget.SimpleAdapter;import java.util.ArrayList;import java.util.Hashtable;import java.util.List;import java.util.Map;public class UIActivity4 extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_ui4);        ListView sa_1 =(ListView)findViewById(R.id.sa_1);        //準備資料來源        List<Map<String,Object>> lm =new ArrayList<Map<String,Object>>();        Map<String,Object> map = new Hashtable<String, Object>();        map.put("image",R.drawable.yuantu);        map.put("name","美食圖片01");        map.put("content","很好吃啊01");        lm.add(map);        map = new Hashtable<String, Object>();        map.put("image",R.drawable.yuantu);        map.put("name","美食圖片02");        map.put("content","很好吃啊02");        lm.add(map);        map = new Hashtable<String, Object>();        map.put("image",R.drawable.yuantu);        map.put("name","美食圖片03");        map.put("content","很好吃啊03");        lm.add(map);        map = new Hashtable<String, Object>();        map.put("image",R.drawable.yuantu);        map.put("name","美食圖片04");        map.put("content","很好吃啊04");        lm.add(map);        //1.數組源裡key數組        String[] str ={"image","name","content"};        //2.layout檔案裡面子視圖的id        int[] viewid = {R.id.lv2,R.id.tv1,R.id.tv2,};        SimpleAdapter sa = new SimpleAdapter(this,lm,R.layout.layout_simple,str,viewid);        sa_1.setAdapter(sa);    }}

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Android課程---最佳化ListView列表視圖