使用ImageSwitcher实现点击按钮浏览图片功能

import com.example.ui5_1.R;

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

public class MainActivity extends Activity {
private ImageSwitcher is_imageSwitcher;

//存放图片id的int数组
private int[] images={
R.drawable.katong1,
R.drawable.katong2,
R.drawable.katong3,
R.drawable.katong4,
R.drawable.katong5,
};
private Button btn_next;
private Button btn_last;
private int index=0;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
is_imageSwitcher=(ImageSwitcher)findViewById(R.id.is_imageswitch);
btn_last=(Button)findViewById(R.id.btn_last);
btn_next=(Button)findViewById(R.id.btn_next);
is_imageSwitcher.setFactory(new ImageViewFactory(this));
is_imageSwitcher.setBackgroundResource(images[index]);
}
class ImageViewFactory implements ViewFactory
{

private Context context;

public ImageViewFactory(Context context)
{
this.context = context;
}

public View makeView() {
// TODO Auto-generated method stub

//定义每个图像的显示大小
ImageView iv = new ImageView(this.contex
4000
t);
iv.setLayoutParams(new ImageSwitcher.LayoutParams(10,10));

return iv;
}

}
public void onClickLast(View v)
{
if(index>=0&&index<images.length-1)
{
index++;
is_imageSwitcher.setBackgroundResource(images[index]);
}else
{
index=images.length-1;
}
}
public void onClickNext(View v)
{
if(index>0&&index<images.length)
{
index--;
is_imageSwitcher.setBackgroundResource(images[index]);
}else
{
index=images.length-1;
}
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

}

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

<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
>

<ImageSwitcher
android:id="@+id/is_imageswitch"
android:layout_width="wrap_content"
android:layout_height="wrap_content"

>
</ImageSwitcher>
</LinearLayout>

<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
>
<Button
android:id="@+id/btn_last"
android:layout_width="150px"
android:layout_height="wrap_content"
android:onClick="onClickLast"
android:layout_marginTop="20dp"
android:text="上一张" >
</Button>

<Button
android:id="@+id/btn_next"
android:layout_marginTop="20dp"
android:layout_width="150px"
android:layout_height="wrap_content"
android:onClick="onClickNext"
android:text="下一张" >
</Button>
</LinearLayout>

</LinearLayout>