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基本视图——ImageSwitcher

作者：追风剑情 发布于：2015-9-21 22:44 分类：Android

attrs.xml文件

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

视图

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"
    tools:context="${relativePackage}.${activityClass}" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Images of San Francisco" />
    
    <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>

代码

package com.example.androidtest;

import android.app.Activity;
import android.content.Context;
import android.content.res.TypedArray;
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.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageSwitcher;
import android.widget.ImageView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ViewSwitcher.ViewFactory;

public class ImageSwitcherActivity extends Activity implements ViewFactory {

	Integer[] imageIDs = {
			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_image_switcher);
		
		imageSwitcher = (ImageSwitcher) findViewById(R.id.switcher1);
		imageSwitcher.setFactory(this);
		//设置淡入淡出效果
		imageSwitcher.setInAnimation(AnimationUtils.loadAnimation(this, 
				android.R.anim.fade_in));
		imageSwitcher.setOutAnimation(AnimationUtils.loadAnimation(this, 
				android.R.anim.fade_out));
		//设置从左边滑入，右边滑出效果
		/*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<?> parent, View view,
					int position, long id) {
				imageSwitcher.setImageResource(imageIDs[position]);
			}
			
		});
	}

	@Override
	public View makeView() {
		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
	{
		Context context;
		int itemBackground;
		
		public ImageAdapter(Context c)
		{
			context = c;
			//设置样式
			TypedArray a = obtainStyledAttributes(R.styleable.Gallery1);
			itemBackground = a.getResourceId(
					R.styleable.Gallery1_android_galleryItemBackground, 0);
			a.recycle();//回收a对象
		}

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

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

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

		@Override
		public View getView(int position, View convertView, ViewGroup parent) {
			ImageView imageView;
			if(convertView == null) {
				imageView = new ImageView(context);
				imageView.setImageResource(imageIDs[position]);
				imageView.setScaleType(ImageView.ScaleType.FIT_XY);
				imageView.setLayoutParams(new Gallery.LayoutParams(150, 120));
			}else{
				imageView = (ImageView) convertView;
			}
			imageView.setBackgroundResource(itemBackground);
			return imageView;
		}
		
	}
}

运行效果

标签: Android