Android-高级UI控件_ImageSwitcher图片切换

代码

package com.lxt008;

import android.app.Activity;
import android.os.Bundle;
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 Activity01 extends Activity implements OnClickListener,ViewFactory
{
    /* 所有要显示的图片资源索引 */
    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,
    }; 

    //创建ImageSwitcher对象
    private ImageSwitcher            m_Switcher;
    //索引
    private static int                index            = 0;

    //“下一页”按钮ID
    private static final int        BUTTON_DWON_ID    = 0x123456;
    //“上一页”按钮ID
    private static final int        BUTTON_UP_ID    = 0x123457;
    //ImageSwitcher对象的ID
    private static final int        SWITCHER_ID        = 0x123458;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);

        //创建一个线性布局LinearLayout
        LinearLayout main_view = new LinearLayout(this);
        //创建ImageSwitcher对象
        m_Switcher = new ImageSwitcher(this);
        //在线性布局中添加ImageSwitcher视图
        main_view.addView(m_Switcher);
        //设置ImageSwitcher对象的ID
        m_Switcher.setId(SWITCHER_ID);
        //设置ImageSwitcher对象的数据源
        m_Switcher.setFactory(this);
        m_Switcher.setImageResource(imagelist[index]);

        //设置显示上面创建的线性布局
        setContentView(main_view);

        //创建“下一张”按钮
        Button next = new Button(this);
        next.setId(BUTTON_DWON_ID);
        next.setText("下一张");
        next.setOnClickListener(this);
        LinearLayout.LayoutParams param = new LinearLayout.LayoutParams(100, 100);
        main_view.addView(next, param);

        //创建“上一张”按钮
        Button pre = new Button(this);
        pre.setId(BUTTON_UP_ID);
        pre.setText("上一张");
        pre.setOnClickListener(this);
        main_view.addView(pre, param);

    }

    //事件监听、处理
    public void onClick(View v)
    {
        switch (v.getId())
        {
            //下一页
            case BUTTON_DWON_ID:
                index++;
                if (index >= imagelist.length)
                {
                    index = 0;
                }
                //ImageSwitcher对象资源索引
                m_Switcher.setImageResource(imagelist[index]);
                break;
            //上一页
            case BUTTON_UP_ID:
                index--;
                if (index < 0)
                {
                    index = imagelist.length - 1;
                }
                //ImageSwitcher对象资源索引
                m_Switcher.setImageResource(imagelist[index]);
                break;
            default:
                break;
        }
    }

    public View makeView()
    {
        //将所有图片通过ImageView来显示
        return new ImageView(this);
    }
}