使用ImageSwitcher显示视图

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本例子主要是展示使用ImageSwitcher来展示视图,伴随有淡入淡出效果,避免突兀的展示
主程序

package com.example.myimageswitcher;

import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.content.res.TypedArray;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.AnimationUtils;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.Gallery.LayoutParams;
import android.widget.ImageSwitcher;
import android.widget.ImageView;
import android.widget.ViewSwitcher.ViewFactory;

public class MainActivity extends Activity implements ViewFactory {
	Integer[] imagesIDs = {
            R.drawable.pic1,
            R.drawable.pic2,
            R.drawable.pic3,
            R.drawable.pic4,
            R.drawable.pic5,
            R.drawable.pic6,
            R.drawable.pic7
	};
	
	private ImageSwitcher imageSwitcher;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		imageSwitcher = (ImageSwitcher) findViewById(R.id.switcher1);
		imageSwitcher.setFactory(this);
		
		imageSwitcher.setInAnimation(AnimationUtils.loadAnimation(this, android.R.anim.slide_in_left));
		imageSwitcher.setOutAnimation(AnimationUtils.loadAnimation(this, android.R.anim.slide_out_right));
		
		Gallery gallery = (Gallery) findViewById(R.id.gallery1);
		gallery.setAdapter(new ImageAdapter(this));
		gallery.setOnItemClickListener(new OnItemClickListener() {

			@Override
			public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
					long arg3) {
				// TODO Auto-generated method stub
				imageSwitcher.setImageResource(imagesIDs[arg2]);
				
			}
		});
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

	@Override
	public View makeView() {
		// TODO Auto-generated method stub
		ImageView imageView = new ImageView(this);
		imageView.setBackgroundColor(0xFF000000);
		imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);
        imageView.setLayoutParams(new
                ImageSwitcher.LayoutParams(
                        LayoutParams.FILL_PARENT,
                        LayoutParams.FILL_PARENT));
		return imageView;
	}
	
	public class ImageAdapter extends BaseAdapter{
		private Context context;
		private int itemBackground;
		
		public ImageAdapter(Context c){
			context = c;
			TypedArray a = obtainStyledAttributes(R.styleable.Gallery1);
			itemBackground = a.getResourceId(R.styleable.Gallery1_android_galleryItemBackground, 0);
			a.recycle();
		}
		@Override
		public int getCount() {
			// TODO Auto-generated method stub
			return imagesIDs.length;
		}

		@Override
		public Object getItem(int position) {
			// TODO Auto-generated method stub
			return position;
		}

		@Override
		public long getItemId(int position) {
			// TODO Auto-generated method stub
			return position;
		}

		@Override
		public View getView(int position, View convertView, ViewGroup parent) {
			// TODO Auto-generated method stub
			ImageView imageView = new ImageView(context);
			imageView.setImageResource(imagesIDs[position]);
			imageView.setScaleType(ImageView.ScaleType.FIT_XY);
			imageView.setLayoutParams(new Gallery.LayoutParams(150,120));
			imageView.setBackgroundResource(itemBackground);
			
			return imageView;
		}
		
	}

}

主布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
    
    <TextView 
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Images of City" />
    
    <Gallery
        android:id="@+id/gallery1" 
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"/>
    
    <ImageSwitcher android:id="@+id/switcher1"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentBottom="true" />
    
</LinearLayout>

新建资源文件/res/values/attrs.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <declare-styleable name="Gallery1">
        <attr name="android:galleryItemBackground" />
    </declare-styleable>
</resources>

完整项目下载
http://pan.baidu.com/s/1pJ59KU3

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