ImageSwitcher 练习（android）

ImageSwitch 需要一个 ViewFactory 接口方法，返回一个 ImageView 对像，同时指定 setFactory 方法

其中试了试用 ImageView 实现 ImageSwitcher ，并没有发现有什么不同，还有是其它什么不同呢？

 

代码如下：

xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello" />
     <ImageView 
         android:id="@+id/iv"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         />
     <Button 
         android:id="@+id/btn"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="切换图片"
         />
     
     <ImageSwitcher 
         android:id="@+id/imageswitch"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"  
         ></ImageSwitcher>
     <Button 
         android:id="@+id/btn2"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="切换图片2"
         />
</LinearLayout>

java代码

package zziss.android.imageswitchtest;

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

public class ImageSwitchTestActivity extends Activity implements ViewFactory {
    /** Called when the activity is first created. */
    private ImageView iv;
    private ImageSwitcher imw;
    private Button    btn;
    private Button    btn2;
    private int       i;
    private int       index;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        iv = (ImageView)this.findViewById(R.id.iv);
        btn = (Button)this.findViewById(R.id.btn);
        btn2 = (Button)this.findViewById(R.id.btn2);
        
        imw  = (ImageSwitcher)this.findViewById(R.id.imageswitch);
        imw.setFactory(this);
        i = 0;
        index =0;
        btn.setOnClickListener(new View.OnClickListener() {
            
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                /*if (i==0)
                {
                    iv.setImageResource(R.drawable.png1410);
                    i=1;
                }
                else
                {
                    iv.setImageResource(R.drawable.png1411);
                    i=0;
                }*/
                if (index>=3)
                    index = 0;
                iv.setImageResource(imagelist[index]);
                index++;
            }
        });
        
        btn2.setOnClickListener(new View.OnClickListener() {
            
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                if (index>=3)
                    index = 0;
                imw.setImageResource(imagelist[index]);
                index++;
            }
        });
        
    }
    
    private static int[] imagelist =
        {
            R.drawable.png1410,
            R.drawable.png1411,
            R.drawable.png1412
        };
    @Override
    public View makeView() {
        // TODO Auto-generated method stub
        return new ImageView(this);
    }
}