android实现图片查看器

如图是程序的运行界面

点击下一张，可以查看下一张图片

具体实现代码

package com.example.imageswitcher;import android.os.Bundle;import android.app.Activity;import android.view.Menu;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 MainActivity extends Activity implements OnClickListener,ViewFactory{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 m_Switcher;private static int index=0;private static final int BUTTON_DOWN_ID=0X123456;private static final int BUTTON_UP_ID=0X123457;private static final int SWITCHER_ID=0X123458;@Overridepublic void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);LinearLayout main_view=new LinearLayout(this);m_Switcher=new ImageSwitcher(this);main_view.addView(m_Switcher);m_Switcher.setId(SWITCHER_ID);m_Switcher.setId(SWITCHER_ID);m_Switcher.setFactory(this);m_Switcher.setImageResource(imagelist[index]);setContentView(main_view);Button next=new Button(this);next.setId(BUTTON_DOWN_ID);next.setText("下一张");next.setOnClickListener(this);LinearLayout.LayoutParams param=new LinearLayout.LayoutParams(100,100);main_view.addView(next,param);Button pre=new Button(this);pre.setId(BUTTON_UP_ID);pre.setText("上一张");pre.setOnClickListener(this);main_view.addView(pre,param);}@Overridepublic void onClick(View v){switch(v.getId()){case BUTTON_DOWN_ID:index++;if(index>=imagelist.length){index=0;}m_Switcher.setImageResource(imagelist[index]);break;case BUTTON_UP_ID:index--;if(index<0){index=imagelist.length-1;}m_Switcher.setImageResource(imagelist[index]);break;default:break;}}public View makeView(){return new ImageView(this);}}

需要实现ViewFactory类并且重写makeView方法