使用ImageSwitcher点击按钮浏览图片

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity" >

<LinearLayout
android:layout_width="fill_parent"
android:layout_height="250dp"
android:gravity="center">

<ImageSwitcher
android:id="@+id/IS01"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
>
</ImageSwitcher>
</LinearLayout>

<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">

<Button
android:id="@+id/pre"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="上一张" />

<Button
android:id="@+id/next"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="下一张" />
</LinearLayout>

</LinearLayout>

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.ViewSwitcher.ViewFactory;

public class MainActivity extends Activity implements ViewFactory, OnClickListener {

private final static Integer[] INTEGERS = {
R.drawable.a,
R.drawable.d,
R.drawable.c,
R.drawable.d,
R.drawable.e,
R.drawable.f,
R.drawable.g,
R.drawable.h,
};

ImageSwitcher imageSwitcher;

Button button,button2;

private  static int index=0;

private final static int DOWN_ID = 0x123456;
private final static int UP_ID = 0x123456;
private final static int SWICHER_ID = 0x123456;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

imageSwitcher = (ImageSwitcher)findViewById(R.id.IS01);
button = (Button)findViewById(R.id.pre);
button2 = (Button)findViewById(R.id.next);

imageSwitcher.setFactory(this);
imageSwitcher.setImageResource(INTEGERS[index]);

button.setOnClickListener(this);
button2.setOnClickListener(this);

}

@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;
}

@Override
public View makeView() {
return new ImageView(this);
}

@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.pre:
index--;
if(index<0){
index = INTEGERS.length-1;

}
imageSwitcher.setImageResource(INTEGERS[index]);
break;

case R.id.next:
index++;
if(index>=INTEGERS.length){
index = 0;
}
imageSwitcher.setImageResource(INTEGERS[index]);

break;
}

}

}