Android高級組件Gallery畫廊視圖使用方法詳解

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
 android:layout_width="fill_parent" 
 android:layout_height="fill_parent" 
 android:orientation="horizontal" 
 android:id="@+id/layout" 
 android:gravity="center"> 
 <Gallery 
 android:id="@+id/gallery1" 
 android:spacing="5px" 
 android:unselectedAlpha="0.6" 
 android:layout_width="match_parent" 
 android:layout_height="wrap_content"/> 
</LinearLayout> 

<?xml version="1.0" encoding="utf-8"?> 
<resources> 
 <declare-styleable name="Gallery"> 
 <attr name="android:galleryItemBackground"/> 
 </declare-styleable> 
</resources> 

package com.example.test; 
 
 
import android.app.Activity; 
import android.content.res.TypedArray; 
import android.os.Bundle; 
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.Toast; 
 
 
public class MainActivity extends Activity{ 
 
 
 @Override 
 protected void onCreate(Bundle savedInstanceState) { 
 super.onCreate(savedInstanceState); 
 setContentView(R.layout.main); 
  
 Gallery gallery=(Gallery)findViewById(R.id.gallery1); 
 final int [] imageId=new int[]{R.drawable.img01,R.drawable.img02,R.drawable.img03,R.drawable.img04, 
  R.drawable.img05,R.drawable.img06,R.drawable.img07,R.drawable.img08, 
  R.drawable.img_top,R.drawable.ic_launcher,R.drawable.in,R.drawable.stop,};//定義并初始化保存圖片id的數(shù)組 
 //創(chuàng)建并改寫B(tài)aseAdapter適配器 
 BaseAdapter adapter=new BaseAdapter(){ 
 
 
  @Override 
  public View getView(int position, View convertView, ViewGroup parent) { 
  ImageView imageView;//聲明一個ImageView的對象 
  if(convertView==null){ 
   imageView=new ImageView(MainActivity.this);//實(shí)例化ImageView對象 
   imageView.setScaleType(ImageView.ScaleType.FIT_XY);//設(shè)置縮放方式 
   imageView. setLayoutParams(new Gallery.LayoutParams(180, 135));//設(shè)置ImageView寬高 
   TypedArray typedArray=obtainStyledAttributes(R.styleable.Gallery);//獲取自定義屬性對象 
   //為imageView設(shè)置背景圖片的資源，使用了自定義屬性對象typedArray獲取自定義背景資源值 
   imageView.setBackgroundResource( 
    typedArray.getResourceId(R.styleable.Gallery_android_galleryItemBackground, 0)); 
   imageView.setPadding(5, 0, 5, 0);//設(shè)置內(nèi)邊距 
  }else{ 
   //如果以前new過View就使用convertView的緩存 
   imageView=(ImageView)convertView; 
  } 
  imageView.setImageResource(imageId[position]); 
  return imageView; 
  } 
  
  //功能:獲得當(dāng)前選項(xiàng)的id 
  @Override 
  public long getItemId(int position) { 
  return position; 
  } 
  
  //功能：獲得當(dāng)前選項(xiàng) 
  @Override 
  public Object getItem(int position) { 
  return position; 
  } 
  
  //獲得數(shù)量 
  @Override 
  public int getCount() { 
  return imageId.length; 
  } 
 
 
 }; 
  
 gallery.setAdapter(adapter); 
 gallery.setSelection(imageId.length/2); 
 gallery.setOnItemClickListener(new OnItemClickListener() { 
 
 
  @Override 
  public void onItemClick(AdapterView<?> parent, View v, int position, 
   long id) { 
  Toast.makeText(MainActivity.this, "您選擇了第"+String.valueOf(position)+"張圖片", 
    Toast.LENGTH_SHORT).show(); 
  } 
 }); 
 } 
}