图片设置[置顶] 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

时间紧张，先记一笔，后续优化与完善。

    一、简介

    a.GridView（络网图视）的功能和用法

    

    

    

    

    b.ImageSwitcher（图形切换器）的功能和用法

    

    

    

    c.Gallery（画廊图视）的功能和用法

    

    

    二、通过一个实例来习学Gallery、GridView和ImageSwitcher

    step1:新建一个目项MyGridViewAndGallery

                                              

    

    三:我们先写用GridView和ImageSwitcher实现

    step1:计设所需的UI面界

    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.  个每单元格的UI面界     /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. */
	@Override
	public 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);
		}
		//获得表现拖的ImageSwitcher
		final ImageSwitcher switcher = (ImageSwitcher) findViewById(R.id.switcher);
		// 设置图片切换的动画果效
		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() {
			@Override
			public 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;
			}
		});
		//创立一个SimpleAdapter
		//用使    /layout/cell.xml作为面界布局
		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 simpleAdapter
		gridView.setAdapter(simpleAdapter);

		// 理处被选中事件
		gridView.setOnItemSelectedListener(new OnItemSelectedListener() {
			@Override
			public void onItemSelected(AdapterView<?> parent, View view,
					int position, long id) {
				// 表现以后被选中的图片
				switcher.setImageResource(imageIDs[position % imageIDs.length]);
			}

			@Override
			public void onNothingSelected(AdapterView<?> parent) {
			}
		});
		// 理处被点击事件
		gridView.setOnItemClickListener(new OnItemClickListener() {
			@Override
			public void onItemClick(AdapterView<?> parent, View view,
					int position, long id) {
				// 表现被单击的图片
				switcher.setImageResource(imageIDs[position % imageIDs.length]);
			}
		});
	}
}

    四:用Gallery和ImageSwitch实现幻灯片方法的图片浏览器

    step1:计设UI面界   /layout/gallery.xml

    

    每日一道理
微笑，是春天里的一丝新绿，是秋日里的一缕阳光，是骄阳下的一片浓荫，是冬雪中的一株梅红……微笑着去面对吧，你会感到人生是那样的温馨与甜蜜！

<?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. */
	@Override
	public 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() {
			@Override
			public 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果效
		switcher.setInAnimation(AnimationUtils.loadAnimation(this,
				android.R.anim.fade_in));
		switcher.setOutAnimation(AnimationUtils.loadAnimation(this,
				android.R.anim.fade_out));
		//创立一个 BaseAdapter对象，该对象责负供给 Gallery所表现的每张图片
		BaseAdapter adapter = new BaseAdapter() {
			@Override
			public 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;
			}

			@Override
			public long getItemId(int position) {
				return position;
			}

			@Override
			public Object getItem(int position) {
				return position;
			}

			@Override
			public int getCount() {
				return imageIDs.length;
			}
		};

		gallery.setAdapter(adapter);

		// 理处被选中事件
		gallery.setOnItemSelectedListener(new OnItemSelectedListener() {
			@Override
			public void onItemSelected(AdapterView<?> parent, View view,
					int position, long id) {
				// 表现以后被选中的图片
				switcher.setImageResource(imageIDs[position % imageIDs.length]);
			}

			@Override
			public void onNothingSelected(AdapterView<?> parent) {
			}
		});
	}
}

    五、用TabHost将两种方法的图片浏览器现展出来

    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 {
	@Override
	protected 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();
		//用使Intent添加到第一个Tab面页
		tabhost.addTab(tabhost.newTabSpec("Grallery").setIndicator("Grallery")
				.setContent(new Intent(this, MyGralleryActivity.class)));
		//用使Intent添加到第二个Tab面页
		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，查看行运果效

    

    a.幻灯片方法的图片浏览器

                      

    

    

    b.带图片预览的图片浏览器

                     

    

文章结束给大家分享下程序员的一些笑话语录： 一条狗在街上闲逛，看见橱窗里一张告示：「招聘程序员。会编程，有团队精神，至少精通两种语言。均等机会。」
　　那条狗就进去申请，但是被拒绝了。
　　「我不能雇一条狗在公司里做事。」经理说。
　　狗不服气，指着告示上「均等机会」几字抗议。
　　经理没法，叹了口气，不屑地问道：「你会编程吗？」
　　那条狗默默地走到电脑前，编了个程序，运作准确。
　　「你有团队精神吗？」经理问。
　　那条狗掉头看了看门外，一大群野狗在外面虎视耽耽。
　　「我真的不能雇狗做这份工作。」经理气急败坏地说。
　　「就算会编程、有团队精神，但是我需要的雇员至少要能精通两种语言。」
　　那条狗抬头看着经理说：「喵－噢。」