【Android开发】经典范例1-实现仿Windows7图片预览窗格效果

<?xml version="1.0" encoding="utf-8"?>  
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    android:orientation="horizontal"  
    android:layout_width="fill_parent"  
    android:layout_height="fill_parent"  
    android:id="@+id/layout1"
    >  
  	<GridView android:id="@+id/gridView1"
  	    android:layout_height="match_parent"
  	    android:layout_width="440px"
  	    android:layout_marginTop="10px"
  	    android:horizontalSpacing="3px"
  	    android:verticalSpacing="3px"
  	    android:numColumns="3"/>
  	<!-- 添加一个图像切换器 -->
  	<ImageSwitcher
  	    android:id="@+id/imageSwitcher1"
  	    android:padding="10px"
  	    android:layout_width="match_parent"
  	    android:layout_height="match_parent"/>
</LinearLayout>  

package com.example.test;  
  
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.view.animation.AnimationUtils;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageSwitcher;
import android.widget.ImageView;
import android.widget.ViewSwitcher.ViewFactory;
  
public class MainActivity extends Activity {  
	private int[] imageId=new int []{R.drawable.img1,R.drawable.img2,R.drawable.img3,R.drawable.img4,
			R.drawable.img5,R.drawable.img6,R.drawable.img7,R.drawable.img8,R.drawable.img9};
	private ImageSwitcher imageSwitcher;
    @Override  
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.main);  
       
        imageSwitcher=(ImageSwitcher)findViewById(R.id.imageSwitcher1);//获取图像切换器
        //设置动画效果
        imageSwitcher.setInAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_in));//设置淡入动画
        imageSwitcher.setOutAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_out));//设置淡出动画
        imageSwitcher.setFactory(new ViewFactory() {
			
			@Override
			public View makeView() {
				//实例化一个ImageView对象
				ImageView imageView=new ImageView(MainActivity.this);
				//设置保持纵横比居中缩放图像
				imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);
				imageView.setLayoutParams(new ImageSwitcher.LayoutParams(
						LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT));
				return imageView;//返回imageView对象
			}
		});
        imageSwitcher.setImageResource(R.drawable.img3);//设置默认显示的图像
        
        
        GridView gridview=(GridView)findViewById(R.id.gridView1);
        BaseAdapter adapter=new BaseAdapter(){


        	@Override
			public View getView(int position, View convertView, ViewGroup parent) {
				ImageView imageView = null;//声明一个ImageView对象
				if(convertView==null){
					imageView=new ImageView(MainActivity.this);//实例化ImageView对象
					/****************设置图像的宽度和高度*******************/
					imageView.setAdjustViewBounds(true);
					imageView.setMaxWidth(150);
					imageView.setMaxHeight(113);
					/*********************************************************/
					imageView.setPadding(5, 5, 5, 5);
				}else{
					imageView=(ImageView)convertView;
				}
				imageView.setImageResource(imageId[position]);
				return imageView;
			}
        	
        	//功能:获得当前选项的id
			@Override
			public long getItemId(int position) {
				return position;
			}
			
			//功能：获得当前选项
			@Override
			public Object getItem(int position) {
				return position;
			}
			
			//获得数量
			@Override
			public int getCount() {
				return imageId.length;
			}
        };
        gridview.setAdapter(adapter);
        gridview.setOnItemClickListener(new OnItemClickListener() {


			@Override
			public void onItemClick(AdapterView<?> parent, View view, int position,
					long id) {
					//显示选中的照片
			       imageSwitcher.setImageResource(imageId[position]);
			}
		});
    }  
}  

运行效果与开头描述相同，成功实现。

转载请注明出处：http://blog.csdn.net/acmman/article/details/45041127