Gallery用法之百家姓顯示

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();// 獲取數據
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靜態類
static class ViewHolder {
public TextView title;
}
public class MyAdapter extends BaseAdapter {
private LayoutInflater mInflater = null;
private MyAdapter(Context context) {
// 根據context上下文加載布局
this.mInflater = LayoutInflater.from(context);
}
@Override
public int getCount() {
// 在此適配器中所代表的數據集中的條目數
return data.size();
}
@Override
public Object getItem(int position) {
// 獲取數據集中與指定索引對應的數據項
return position;
}
@Override
public long getItemId(int position) {
// 獲取在列表中與指定索引對應的行id
return position;
}
// 獲取一個在數據集中指定索引的視圖來顯示數據
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
// 如果緩存convertView為空，則需要創建View
if (convertView == null) {
holder = new ViewHolder();
// 根據自定義的Item布局加載布局
convertView = mInflater.inflate(R.layout.list_item, null);
holder.title = (TextView) convertView.findViewById(R.id.title);
holder.title.setTextSize(32);
// 將設置好的布局保存到緩存中，并將其設置在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","孫","杜","趙","吳","陸","楊","侯","屈","宋","周","張","陳","馮",
"朱","蔣","沈","韓","秦","許","何","呂","孔","諸葛","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>

http://670176656.blog.51cto.com/addblog.php