阅读《Android 从入门到精通》（24）——切换图片

java.lang.Object;
android.view.View;
android.widget.ViewGroup;
android.widget.FrameLayout;
android.widget.ViewAnimator;
android.widget.ImageSwitcher;

ImageSwitcher 提供了显示图片以及图片切换的动画，这一块能够应用于制作动感影集。

ImageSwitcher 类方法

ImageSwitcher 和 Gallery 演示样例

完整project：http://download.csdn.net/detail/sweetloveft/9428069

ViewFactory下述project中主要演示了 ImageSwitcher 和 Gallery 的使用方法，须要注意的是：ViewFactory.makeView 的实现中，ImageView 所要设置的布局类型是 FrameLayout.LayoutParams，除此之外，其它地方出现要设置的參数均为 Gallery.LayoutParams。否则会导致崩溃！
此外还能够学习下，Window 相关的属性

1.MainActivity.java

package com.sweetlover.activity;

import com.sweetlover.imageswitcher.R;

import android.app.Activity;
import android.content.Context;
import android.graphics.Color;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.view.animation.AnimationUtils;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.FrameLayout;
import android.widget.Gallery.LayoutParams;
import android.widget.ImageView;
import android.widget.ImageView.ScaleType;
import android.widget.ViewSwitcher.ViewFactory;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageSwitcher;

@SuppressWarnings("deprecation")
public class MainActivity extends Activity implements ViewFactory,
		OnItemSelectedListener {

	public class SelfAdapter extends BaseAdapter {

		private Context context = null;
		
		public SelfAdapter(Context context) {
			super();
			this.context = context;
		}

		@Override
		public int getCount() {
			// TODO Auto-generated method stub
			return pic.length;
		}

		@Override
		public Object getItem(int position) {
			// TODO Auto-generated method stub
			return pic[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);
			LayoutParams param = new LayoutParams(WIDTH, HEIGHT);
			imageView.setImageResource(pic[position]);
			imageView.setAdjustViewBounds(true);
			imageView.setLayoutParams(param);
			return imageView;
		}
	}

	private Gallery gallery = null;
	private SelfAdapter selfAdapter = null;
	private ImageSwitcher imageSwitcher = null;
	private FrameLayout.LayoutParams param = null;
	
	private static final int WIDTH = 480;
	private static final int HEIGHT = 640;
	private static final int BACKGND_COLOR = Color.BLACK;
	private static final int IN_ANIM = android.R.anim.fade_in;
	private static final int OUT_ANIM = android.R.anim.fade_out;
	private static final Integer[] pic = { R.drawable.pic1, R.drawable.pic2,
			R.drawable.pic3 };

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		requestWindowFeature(Window.FEATURE_NO_TITLE);
		setContentView(R.layout.activity_main);

		gallery = (Gallery) findViewById(R.id.gallery);
		imageSwitcher = (ImageSwitcher) findViewById(R.id.imageSwitcher);
		selfAdapter = new SelfAdapter(this);
		imageSwitcher.setFactory(this);
		imageSwitcher.setInAnimation(AnimationUtils
				.loadAnimation(this, IN_ANIM));
		imageSwitcher.setOutAnimation(AnimationUtils.loadAnimation(this,
				OUT_ANIM));
		gallery.setAdapter(selfAdapter);
		gallery.setOnItemSelectedListener(this);
	}

	@Override
	public void onItemSelected(AdapterView<?> parent, View view, int position,
			long id) {
		// TODO Auto-generated method stub
		imageSwitcher.setImageResource(pic[position]);
	}

	@Override
	public void onNothingSelected(AdapterView<?
> parent) {
		// TODO Auto-generated method stub

	}

	@Override
	public View makeView() {
		// TODO Auto-generated method stub
		ImageView imageView = new ImageView(this);
		param = new FrameLayout.LayoutParams(WIDTH, HEIGHT, Gravity.CENTER);
		imageView.setBackgroundColor(BACKGND_COLOR);
		imageView.setScaleType(ScaleType.CENTER);
		imageView.setLayoutParams(param);
		return imageView;
	}
}

2.activity_main.xml

3.AndroidManifest.xml