android开发之图片转换的实例代码

package com.zhang.showPhoto;
import android.app.ActionBar.LayoutParams;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.animation.AnimationUtils;
import android.widget.Button;
import android.widget.ImageSwitcher;
import android.widget.ImageView;
import android.widget.ViewSwitcher.ViewFactory;
public class MainActivity extends Activity {

 private int[] imagId=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.img09,R.drawable.img10
  };
 private int index=0;
 private ImageSwitcher imageSwitcher;
 private Button up,down;
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {

  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);

  up=(Button) findViewById(R.id.bt1);
  down=(Button) findViewById(R.id.bt2);

 
  imageSwitcher=(ImageSwitcher) findViewById(R.id.imagSw1);
  imageSwitcher.setInAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_in));
  imageSwitcher.setOutAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_out));
  imageSwitcher.setFactory(new ViewFactory() {

  
   public View makeView() {
    ImageView imageView = new ImageView(MainActivity.this);
    imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);
    imageView.setLayoutParams(new ImageSwitcher.LayoutParams(
      LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT
      ));
    return imageView;
   }
  });

  imageSwitcher.setImageResource(imagId[index]);

  up.setOnClickListener(new OnClickListener() {

   @Override
   public void onClick(View v) {
    if(index>0){
     index--;
    }else{
     index=imagId.length-1;
    }
    imageSwitcher.setImageResource(imagId[index]);
   }
  });

  down.setOnClickListener(new OnClickListener() {

   @Override
   public void onClick(View v) {
    if(index<imagId.length-1){
     index++;
    }else{
     index=0;
    }
    imageSwitcher.setImageResource(imagId[index]);
   }
  });
 }
}
 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:background="@drawable/bg1"
    android:id="@+id/llayout"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:gravity="center"
    android:orientation="horizontal" >
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" 
        android:text="上一张"
        android:id="@+id/bt1"
        />
    <ImageSwitcher 
         android:layout_width="wrap_content"
        android:layout_height="wrap_content" 
        android:id="@+id/imagSw1"
        android:layout_gravity="center"
        />
     <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" 
        android:text="下一张"
        android:id="@+id/bt2"
        />
</LinearLayout>