ImageSwitcher 图片切换的控件

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package com.zhu.testandroid;
 
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup.LayoutParams;
import android.view.animation.AnimationUtils;
import android.widget.Button;
import android.widget.ImageSwitcher;
import android.widget.ImageView;
import android.widget.ViewSwitcher.ViewFactory;
 
public class MyImageSwitcher extends Activity {
    private ImageSwitcher imageSwitcher;
    private Button btnPrevious;
    private Button btnNext;
    private int foot = 0;
    private int[] imgRes = new int[] { R.drawable.a, R.drawable.b,
            R.drawable.c, R.drawable.d, R.drawable.e, };
 
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState); // 生命周期方法
        super.setContentView(R.layout.activity_image_sw); // 设置要使用的布局管理器
        imageSwitcher = (ImageSwitcher) findViewById(R.id.imageSwitcher);
        btnPrevious = (Button) findViewById(R.id.btnPrevious);
        btnNext = (Button) findViewById(R.id.btnNext);
 
        imageSwitcher.setFactory(new ViewFactory() {// 设置转化工厂
 
                    @Override
                    public View makeView() {
                        ImageView imageView = new ImageView(
                                MyImageSwitcher.this);
                        imageView.setBackgroundColor(0xFFFFFFFF);
                        imageView.setScaleType(ImageView.ScaleType.CENTER);// 居中显示
                        imageView
                                .setLayoutParams(new ImageSwitcher.LayoutParams(
                                        LayoutParams.MATCH_PARENT,
                                        LayoutParams.MATCH_PARENT));// 定义组件
                        return imageView;
                    }
                });
        imageSwitcher.setImageResource(imgRes[foot++]);// 初始化时显示,必须放在工厂后面,否则会报NullPointerException
        imageSwitcher.setInAnimation(AnimationUtils.loadAnimation(this,
                android.R.anim.fade_in));// 设置动画
        imageSwitcher.setOutAnimation(AnimationUtils.loadAnimation(this,
                android.R.anim.fade_out));// 设置动画
        btnPrevious.setOnClickListener(new OnClickListener() {
 
            public void onClick(View v) {
                MyImageSwitcher.this.imageSwitcher
                        .setImageResource(imgRes[foot--]);
                MyImageSwitcher.this.checkBtnEnable();
 
            }
        });
        btnNext.setOnClickListener(new OnClickListener() {
 
            public void onClick(View v) {
                MyImageSwitcher.this.imageSwitcher
                        .setImageResource(imgRes[foot++]);
                MyImageSwitcher.this.checkBtnEnable();
 
            }
        });
 
    }
 
    protected void checkBtnEnable() {// 判断按钮可用状态
        if (this.foot < this.imgRes.length - 1) {
            this.btnNext.setEnabled(true);
        } else {
            this.btnNext.setEnabled(false);
        }
        if (this.foot == 0) {
            this.btnPrevious.setEnabled(false);
        } else {
            this.btnPrevious.setEnabled(true);
        }
 
    }
 
}

  

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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
 
    <ImageSwitcher
        android:id="@+id/imageSwitcher"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center" />
 
    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >
 
        <Button
            android:id="@+id/btnPrevious"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:enabled="false"
            android:text="上一张" />
 
        <Button
            android:id="@+id/btnNext"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:enabled="true"
            android:text="下一张" />
    </LinearLayout>
 
</LinearLayout>

  

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