android的ListView图文混搭

<?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" > <ListView android:id="@+id/listView4_1_1" android:layout_width="match_parent" android:layout_height="wrap_content" ></ListView> </LinearLayout>

<?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" android:orientation="horizontal" android:gravity="center" > <ImageView android:id="@+id/p_w_picpathView4_1_1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/ic_launcher" /> <TextView android:id="@+id/textView4_1_1" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="textView" /> </LinearLayout>

package com.example.listview; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import android.R.anim; import android.R.drawable; import android.app.Activity; import android.os.Bundle; import android.widget.ListView; import android.widget.SimpleAdapter; public class MainActivity4 extends Activity{ private ListView listView; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.main4); listView=(ListView) findViewById(R.id.listView4_1_1); //一个列表项的内容 Map<String, Object> map=new HashMap<String, Object>(); map.put("p_w_picpath", R.drawable.ic_launcher); map.put("name", "张三"); Map<String, Object> map2=new HashMap<String, Object>(); map2.put("p_w_picpath", R.drawable.ic_launcher); map2.put("name", "王五"); List<Map<String, Object>> list=new ArrayList<Map<String,Object>>(); list.add(map); list.add(map2); SimpleAdapter simpleAdapter=new SimpleAdapter(this, list, R.layout.main4_item, new String [] {"p_w_picpath","name"}, new int [] {R.id.p_w_picpathView4_1_1,R.id.textView4_1_1}); listView.setAdapter(simpleAdapter); } }

<?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" > <ListView android:id="@+id/listView5_1_1" android:layout_width="match_parent" android:layout_height="wrap_content" ></ListView> </LinearLayout>

<?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" android:orientation="horizontal" android:gravity="center" > <ImageView android:id="@+id/p_w_picpathView5_1_1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/a" /> <TextView android:id="@+id/textView5_1_1" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="textView" /> </LinearLayout>

<?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" > <ListView android:id="@+id/listView5_1_1" android:layout_width="match_parent" android:layout_height="fill_parent" ></ListView> </LinearLayout>

//屏幕一次显示7(假设)条记录，则调用7次getView方法，只负责在屏幕中显示的内容的创建，其他的在滑动显示时才创建 //因为ListView的高度设置为 android:layout_height="wrap_content" //调用一次getView，绘制一次，增加子组件时会重新绘制(计算高度),所以会多次调用getView()方法 //增加一个组件，重新绘制ListView， //每绘制一次ListView，每一个子组件都重新绘制(有几个子组件调用几次) //ListView设置成 android:layout_height="fill_parent" //只输出0,1,2,3,4,5一次 System.out.println("position:"+position);

System.out.print("position:"+position); System.out.println(" "+convertView); //获取布局填充器 LayoutInflater layoutInflater=getLayoutInflater(); //获取main5_item的布局模板,创建布局对象 //如果没有空闲的convertView，创建convertView，否则重复利用convertView if(convertView==null){ convertView=layoutInflater.inflate(R.layout.main5_item, null); }

package com.example.listview; import android.app.Activity; import android.os.Bundle; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.ImageView; import android.widget.ListView; import android.widget.TextView; public class MainActivity5 extends Activity { private ListView listView; //定义的数据 private int [] p_w_picpaths={R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher}; private String [] names={"xiaobai","xiaoming","xiaobai","xiaoming","xiaobai","xiaoming","xiaobai","xiaoming","xiaobai","xiaoming","xiaobai","xiaoming"}; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.main5); listView=(ListView) findViewById(R.id.listView5_1_1); listView.setAdapter(new MyAdapter()); } //自定义适配器 //ListView的优化： //1.重复使用convertView对象 //2.使用viewHolder提高在容器中查找组件的效率 class MyAdapter extends BaseAdapter{ //获取列表项总数 @Override public int getCount() { // TODO Auto-generated method stub return names.length; } //获取每一个列表项(根据下标获取) @Override public Object getItem(int position) { // TODO Auto-generated method stub return names[position]; } //获取每一个列表项的id @Override public long getItemId(int position) { // TODO Auto-generated method stub return position; } // @Override public View getView(int position, View convertView, ViewGroup parent) { // TODO Auto-generated method stub //屏幕一次显示7(假设)条记录，则调用7次getView方法，只负责在屏幕中显示的内容的创建，其他的在滑动显示时才创建 //因为ListView的高度设置为 android:layout_height="wrap_content" //调用一次getView，绘制一次，增加子组件时会重新绘制(计算高度),所以会多次调用getView()方法 //增加一个组件，重新绘制ListView， //每绘制一次ListView，每一个子组件都重新绘制(有几个子组件调用几次) //ListView设置成 android:layout_height="fill_parent" //只输出0,1,2,3,4,5一次 System.out.print("position:"+position); System.out.println(" "+convertView); //获取布局填充器 LayoutInflater layoutInflater=getLayoutInflater(); //获取main5_item的布局模板,创建布局对象 //如果没有空闲的convertView，创建convertView，否则重复利用convertView ViewHolder viewHolder; if(convertView==null){ convertView=layoutInflater.inflate(R.layout.main5_item, null); viewHolder=new ViewHolder(); viewHolder.p_w_picpathView=(ImageView) convertView.findViewById(R.id.p_w_picpathView5_1_1); viewHolder.textView=(TextView) convertView.findViewById(R.id.textView5_1_1); convertView.setTag(viewHolder); }else { viewHolder=(ViewHolder) convertView.getTag(); } //View convertView=layoutInflater.inflate(R.layout.main5_item, null); //从得到的view查找相应view /*ImageView p_w_picpathView=(ImageView) convertView.findViewById(R.id.p_w_picpathView5_1_1); TextView textView=(TextView) convertView.findViewById(R.id.textView5_1_1); p_w_picpathView.setImageResource(p_w_picpaths[position]); textView.setText(names[position]);*/ viewHolder.p_w_picpathView.setImageResource(p_w_picpaths[position]); viewHolder.textView.setText(names[position]); return convertView; } } class ViewHolder{ ImageView p_w_picpathView; TextView textView; } }

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