Android ImageSwithcher的使用

图片切换ImageSwitcher的使用:

package com.Aina.Android;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageSwitcher;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ViewSwitcher.ViewFactory;

public class Test_ImageSwitcher extends Activity implements OnClickListener,ViewFactory{
    /** Called when the activity is first created. */
	//所有要显示的图片资源索引
	private static final Integer[] imagelist = {
		R.drawable.img1,
		R.drawable.img2,
		R.drawable.img3,
		R.drawable.img4,
		R.drawable.img5,
		R.drawable.img6,
		R.drawable.img7,
		R.drawable.img8
	};
	private ImageSwitcher imageswitcher;
	private static int index = 0;
	//设置各组件ID
	private static final int Button_NEXT = 0x123456;
	private static final int Button_BACK = 0x123457;
	private static final int ImageSwitcher = 0x123458;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //创建一个线性布局
        LinearLayout layout = new LinearLayout(this);
        layout.setOrientation(LinearLayout.HORIZONTAL);//水平布局
        imageswitcher = new ImageSwitcher(this);
        LinearLayout.LayoutParams p2 = new LinearLayout.LayoutParams(120,120);
        layout.addView(imageswitcher,p2);
        imageswitcher.setId(ImageSwitcher);//设置ID
        imageswitcher.setFactory(this);//设置此对象的数据源
        imageswitcher.setImageResource(imagelist[index]);        
        setContentView(layout);
        
        //创建下一张按钮
        Button next = new Button(this);
        next.setId(Button_NEXT);
        next.setText("下一张");
        next.setOnClickListener(this);
        LinearLayout.LayoutParams p = new LinearLayout.LayoutParams(100,100);
        layout.addView(next, p);
        //创建上一张按钮
        Button back = new Button(this);
        back.setId(Button_BACK);
        back.setText("上一张");
        back.setOnClickListener(this);
        layout.addView(back, p);
    }
	@Override
	public void onClick(View v) {
		if(v.getId()==Button_BACK){
			index--;
			if(index<0){
				index = imagelist.length-1;
			}
			imageswitcher.setImageResource(imagelist[index]);
		}else if(v.getId()==Button_NEXT){
			index++;
			if(index>=imagelist.length){
				index = 0;
			}
			imageswitcher.setImageResource(imagelist[index]);
		}
	}
	@Override
	public View makeView() {
		Log.i("TAG", "makeView()");
		return new ImageView(this);
	}
}