上次讲了如何使用Gallery控件，这次就讲Gallery 与ImageSwitcher的结合使用，本文实现一个简单的浏览图片的功能。先贴出程序运行截图：
除了Gallery可以拖拉切换图片，我在ImageSwitcher控件加入了setOnTouchListener事件实现，使得ImageSwitcher也可以在拖拉中切换图片。本例子依然使用JAVA的反射机制来自动读取资源中的图片。
main.xml的源码如下:
view plaincopy to clipboardprint?<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"><ImageSwitcher android:id="@+id/switcher"android:layout_width="match_parent" android:layout_height="match_parent"/><Gallery android:id="@+id/gallery"android:background="#55000000"android:layout_width="match_parent"android:layout_alignParentBottom="true"android:layout_alignParentLeft="true"android:gravity="center_vertical"android:spacing="16dp" android:layout_height="100dp"/></RelativeLayout><?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"><ImageSwitcher android:id="@+id/switcher"android:layout_width="match_parent" android:layout_height="match_parent"/><Gallery android:id="@+id/gallery"android:background="#55000000"android:layout_width="match_parent"android:layout_alignParentBottom="true"android:layout_alignParentLeft="true"android:gravity="center_vertical"android:spacing="16dp" android:layout_height="100dp"/></RelativeLayout>
程序的源码如下:
view plaincopy to clipboardprint?package com.testImageView;import java.lang.reflect.Field;import java.util.ArrayList;import android.app.Activity;import android.content.Context;import android.os.Bundle;import android.view.MotionEvent;import android.view.View;import android.view.View.OnTouchListener;import android.view.ViewGroup;import android.view.animation.AnimationUtils;import android.widget.AdapterView;import android.widget.BaseAdapter;import android.widget.Gallery;import android.widget.ImageSwitcher;import android.widget.ImageView;import android.widget.AdapterView.OnItemSelectedListener;import android.widget.Gallery.LayoutParams;import android.widget.ViewSwitcher.ViewFactory;public class testImageView extends Activity implements ViewFactory {private ImageSwitcher is;private Gallery gallery;private int downX,upX;private ArrayList<Integer> imgList=new ArrayList<Integer>();//图像ID@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);setContentView(R.layout.main);//用反射机制来获取资源中的图片IDField[] fields = R.drawable.class.getDeclaredFields();for (Field field : fields){if (!"icon".equals(field.getName()))//除了icon之外的图片{int index = 0;try {index = field.getInt(R.drawable.class);} catch (IllegalArgumentException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IllegalAccessException e) {// TODO Auto-generated catch blocke.printStackTrace();}//保存图片IDimgList.add(index);}}//设置ImageSwitcher控件is = (ImageSwitcher) findViewById(R.id.switcher);is.setFactory(this);is.setInAnimation(AnimationUtils.loadAnimation(this,&
