我的Android进阶之旅------>Android之Gallery和GridView两种方式与ImageSwitcher实现带预览的和幻灯片方式的两种图片浏览器

一、简介

a.GridView（网络视图）的功能和用法

b.ImageSwitcher（图形切换器）的功能和用法

c.Gallery（画廊视图）的功能和用法

二、通过一个实例来学习Gallery、GridView和ImageSwitcher

step1:新建一个项目MyGridViewAndGallery

                                          

三:我们先写用GridView和ImageSwitcher实现

step1:设计所需的UI界面

a.   /layout/gridview.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:gravity="center"    >   <GridView      android:id="@+id/grid01"    android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:horizontalSpacing="2pt"    android:verticalSpacing="2pt"    android:numColumns="4"    android:gravity="center"    />    <ImageSwitcher     android:id="@+id/switcher"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:layout_gravity="center_horizontal"    /></LinearLayout>

b.  每个单元格的UI界面     /layout/cell.xml

<?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">   <ImageView  android:id="@+id/image1" android:layout_width="50dp"    android:layout_height="50dp"    android:layout_gravity="center_horizontal"/></LinearLayout>

step2:MyGridViewActivity.java

package cn.roco.gridview;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.ViewGroup.LayoutParams;import android.view.animation.AnimationUtils;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.AdapterView.OnItemSelectedListener;import android.widget.GridView;import android.widget.ImageSwitcher;import android.widget.ImageView;import android.widget.SimpleAdapter;import android.widget.ViewSwitcher.ViewFactory;public class MyGridViewActivity extends Activity {int[] imageIDs = new int[] { R.drawable.beautiful_001,R.drawable.beautiful_002, R.drawable.beautiful_003,R.drawable.beautiful_004, R.drawable.beautiful_005,R.drawable.beautiful_006, R.drawable.beautiful_007,R.drawable.beautiful_008, R.drawable.beautiful_009,R.drawable.beautiful_010, R.drawable.beautiful_011,R.drawable.beautiful_012, R.drawable.beautiful_013 };/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.gridview);List<Map<String, Object>> listItems = new ArrayList<Map<String, Object>>();for (int i = 0; i < imageIDs.length; i++) {Map<String, Object> listItem = new HashMap<String, Object>();listItem.put("image", imageIDs[i]);listItems.add(listItem);}//获取显示拖的ImageSwitcherfinal ImageSwitcher switcher = (ImageSwitcher) findViewById(R.id.switcher);// 设置图片切换的动画效果switcher.setInAnimation(AnimationUtils.loadAnimation(this,android.R.anim.fade_in));switcher.setOutAnimation(AnimationUtils.loadAnimation(this,android.R.anim.fade_out));// 为ImageSwitch设置图片切换的图片switcher.setFactory(new ViewFactory() {@Overridepublic View makeView() {ImageView imageView = new ImageView(MyGridViewActivity.this);imageView.setBackgroundColor(0xff0000);imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);imageView.setLayoutParams(new ImageSwitcher.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));return imageView;}});//创建一个SimpleAdapter//使用    /layout/cell.xml作为界面布局SimpleAdapter simpleAdapter = new SimpleAdapter(this, listItems,R.layout.cell, new String[] { "image" },new int[] { R.id.image1 });GridView gridView = (GridView) findViewById(R.id.grid01);//为 GridView设置 simpleAdaptergridView.setAdapter(simpleAdapter);// 处理被选中事件gridView.setOnItemSelectedListener(new OnItemSelectedListener() {@Overridepublic void onItemSelected(AdapterView<?> parent, View view,int position, long id) {// 显示当前被选中的图片switcher.setImageResource(imageIDs[position % imageIDs.length]);}@Overridepublic void onNothingSelected(AdapterView<?> parent) {}});// 处理被点击事件gridView.setOnItemClickListener(new OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> parent, View view,int position, long id) {// 显示被单击的图片switcher.setImageResource(imageIDs[position % imageIDs.length]);}});}}

四:用Gallery和ImageSwitch实现幻灯片方式的图片浏览器

step1:设计UI界面   /layout/gallery.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:gravity="center"    >    <ImageSwitcher     android:id="@+id/gallerySwitcher"    android:layout_width="320dp"    android:layout_height="320dp"    />        <Gallery android:id="@+id/gallery"    android:layout_width="fill_parent"    android:layout_height="wrap_content"    android:layout_marginTop="25dp"    android:unselectedAlpha="0.6"    android:spacing="3dp"     /></LinearLayout>

step2:MyGralleryActivity.java

package cn.roco.gridview;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.ViewGroup;import android.view.ViewGroup.LayoutParams;import android.view.animation.AnimationUtils;import android.widget.AdapterView;import android.widget.AdapterView.OnItemSelectedListener;import android.widget.BaseAdapter;import android.widget.Gallery;import android.widget.ImageSwitcher;import android.widget.ImageView;import android.widget.ViewSwitcher.ViewFactory;public class MyGralleryActivity extends Activity {int[] imageIDs = new int[] { R.drawable.beautiful_001,R.drawable.beautiful_002, R.drawable.beautiful_003,R.drawable.beautiful_004, R.drawable.beautiful_005,R.drawable.beautiful_006, R.drawable.beautiful_007,R.drawable.beautiful_008, R.drawable.beautiful_009,R.drawable.beautiful_010, R.drawable.beautiful_011,R.drawable.beautiful_012, R.drawable.beautiful_013 };/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.gallery);final Gallery gallery = (Gallery) findViewById(R.id.gallery);final ImageSwitcher switcher = (ImageSwitcher) findViewById(R.id.gallerySwitcher);// 为ImageSwitch设置图片切换的图片switcher.setFactory(new ViewFactory() {@Overridepublic View makeView() {ImageView imageView = new ImageView(MyGralleryActivity.this);imageView.setBackgroundColor(0xff0000);imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);imageView.setLayoutParams(new ImageSwitcher.LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT));return imageView;}});// 设置图片切换的动画效果switcher.setInAnimation(AnimationUtils.loadAnimation(this,android.R.anim.fade_in));switcher.setOutAnimation(AnimationUtils.loadAnimation(this,android.R.anim.fade_out));//创建一个 BaseAdapter对象，该对象负责提供 Gallery所显示的每张图片BaseAdapter adapter = new BaseAdapter() {@Overridepublic View getView(int position, View convertView, ViewGroup parent) {ImageView imageView = new ImageView(MyGralleryActivity.this);imageView.setImageResource(imageIDs[position % imageIDs.length]);imageView.setScaleType(ImageView.ScaleType.FIT_XY);imageView.setLayoutParams(new Gallery.LayoutParams(75,100));return imageView;}@Overridepublic long getItemId(int position) {return position;}@Overridepublic Object getItem(int position) {return position;}@Overridepublic int getCount() {return imageIDs.length;}};gallery.setAdapter(adapter);// 处理被选中事件gallery.setOnItemSelectedListener(new OnItemSelectedListener() {@Overridepublic void onItemSelected(AdapterView<?> parent, View view,int position, long id) {// 显示当前被选中的图片switcher.setImageResource(imageIDs[position % imageIDs.length]);}@Overridepublic void onNothingSelected(AdapterView<?> parent) {}});}}

五、用TabHost将两种方式的图片浏览器展现出来

MyIntentTab.java

package cn.roco.gridview;import android.app.TabActivity;import android.content.Intent;import android.os.Bundle;import android.view.Window;import android.view.WindowManager;import android.widget.TabHost;public class MyIntentTab extends TabActivity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN); //请求全屏getWindow().requestFeature(Window.FEATURE_NO_TITLE); //请求没有标题栏TabHost tabhost = getTabHost();//使用Intent添加到第一个Tab页面tabhost.addTab(tabhost.newTabSpec("Grallery").setIndicator("Grallery").setContent(new Intent(this, MyGralleryActivity.class)));//使用Intent添加到第二个Tab页面tabhost.addTab(tabhost.newTabSpec("GridView").setIndicator("GridView").setContent(new Intent(this, MyGridViewActivity.class)));}}

六、AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"      package="cn.roco.gridview"      android:versionCode="1"      android:versionName="1.0">    <uses-sdk android:minSdkVersion="8" />    <application android:icon="@drawable/icon" android:label="@string/app_name">        <activity android:name=".MyIntentTab"                  android:label="@string/app_name">            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity><activity android:name=".MyGralleryActivity"/><activity android:name=".MyGridViewActivity"/>    </application></manifest>

七、部署应用到模拟器上，查看运行效果

a.幻灯片方式的图片浏览器

                  

b.带图片预览的图片浏览器

                 

    ==================================下面看一个gif动画===========================================

                                                       

本文源代码可以在以下地址进行免费下载

1. http://download.csdn.net/detail/qq446282412/6467783
2. http://pan.baidu.com/share/link?shareid=407417&uk=805959799
   

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  作者：欧阳鹏  欢迎转载，与人分享是进步的源泉！

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