Gallery用法之百家姓显示

package com.example.testgallary;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.graphics.Color;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity implements OnItemClickListener{
private Gallery mGallery;
private MyAdapter adapter;
private List<Map<String, Object>> data = null;
private List<Map<String, Object>> list;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mGallery = (Gallery) findViewById(R.id.gallery1);
data = getData();// 获取数据
adapter = new MyAdapter(this);
mGallery.setAdapter(adapter);
mGallery.setOnItemClickListener(this);
}
private List<Map<String, Object>> getData(){
list = new ArrayList<Map<String, Object>>();
Map<String, Object> map;
for(int i=0; i<str.length; i++){
map = new HashMap<String, Object>();
map.put("title", str[i]);
list.add(map);
}
return list;
}
// ViewHolder静态类
static class ViewHolder {
public TextView title;
}
public class MyAdapter extends BaseAdapter {
private LayoutInflater mInflater = null;
private MyAdapter(Context context) {
// 根据context上下文加载布局
this.mInflater = LayoutInflater.from(context);
}
@Override
public int getCount() {
// 在此适配器中所代表的数据集中的条目数
return data.size();
}
@Override
public Object getItem(int position) {
// 获取数据集中与指定索引对应的数据项
return position;
}
@Override
public long getItemId(int position) {
// 获取在列表中与指定索引对应的行id
return position;
}
// 获取一个在数据集中指定索引的视图来显示数据
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
// 如果缓存convertView为空，则需要创建View
if (convertView == null) {
holder = new ViewHolder();
// 根据自定义的Item布局加载布局
convertView = mInflater.inflate(R.layout.list_item, null);
holder.title = (TextView) convertView.findViewById(R.id.title);
holder.title.setTextSize(32);
// 将设置好的布局保存到缓存中，并将其设置在Tag里，以便后面方便取出Tag
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.title.setText((String) data.get(position).get("title"));
holder.title.setTextColor(Color.BLACK);//
return convertView;
}
}
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
Toast.makeText(MainActivity.this, data.get(arg2).get("title").toString(), Toast.LENGTH_SHORT).show();
}
String[] str = {"李","王","孙","杜","赵","吴","陆","杨","侯","屈","宋","周","张","陈","冯",
"朱","蒋","沈","韩","秦","许","何","吕","孔","诸葛","夏侯"};
}

//activity_main layout布局文件

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >
    <Gallery
        android:id="@+id/gallery1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"/>
</LinearLayout>

//list_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:orientation="horizontal">
    <TextView
        android:id="@+id/title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="20sp"
        android:layout_marginRight="20sp"
        android:text="" />
</LinearLayout>

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