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   源码介绍

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package com.example.imagewatch_text1;

import android.app.Activity;
import android.content.res.TypedArray;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.view.animation.Animation;
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.LinearLayout;
import android.widget.Toast;
import android.widget.ViewSwitcher.ViewFactory;

public class MainActivity extends Activity implements ViewFactory,
		OnTouchListener {
	private int[] imageId = new int[] { R.drawable.img01, R.drawable.img02,
			R.drawable.img03, R.drawable.img04, R.drawable.img05,
			R.drawable.img06, R.drawable.img07, R.drawable.img08,
			R.drawable.img09, R.drawable.img10, R.drawable.img11,
			R.drawable.img12, }; // 定义并初始化保存图片id的数组
	private ImageSwitcher imageSwitcher; // 声明一个图像切换器对象
	/** 当前选中的图片id序号 */
	private int currentPosition;
	/** 按下点的X坐标 */
	private float downX;
	private Adapter adapter;
	/** false为未出现gallery,否则反 */
	private Boolean flag = true;
	private LinearLayout galler_visble;
	private int position_current;
	@SuppressWarnings("deprecation")
	private Gallery gallery;

	@SuppressWarnings("deprecation")
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		gallery = (Gallery) findViewById(R.id.gallery1); // 获取Gallery组件
		imageSwitcher = (ImageSwitcher) findViewById(R.id.imageSwitcher1); // 获取图像切换器
		galler_visble = (LinearLayout) findViewById(R.id.galler_visble);
		imageSwitcher.setFactory(this);
		// 设置OnTouchListener，我们通过Touch事件来切换图片
		imageSwitcher.setOnTouchListener(this);
		// 这个我是从上一个界面传过来的，上一个界面是一个GridView
		// currentPosition = getIntent().getIntExtra("position", 0);
		adapter = new Adapter();
		// currentPosition = adapter.getPosition();
		// imageSwitcher.setImageResource(imageId[currentPosition]);
		Log.i("dony", "currentPosition//////////"   currentPosition);
		// setGalleryPosition(currentPosition);

		// 设置动画效果
		// imageSwitcher.setInAnimation(AnimationUtils.loadAnimation(this,
		// android.R.anim.fade_in)); // 设置淡入动画
		// imageSwitcher.setOutAnimation(AnimationUtils.loadAnimation(this,
		// android.R.anim.fade_out)); // 设置淡出动画
		// imageSwitcher.setFactory(new ViewFactory() {
		//
		// @Override
		// public View makeView() {
		// ImageView imageView = new ImageView(MainActivity.this); //
		// 实例化一个ImageView类的对象
		// imageView.setScaleType(ImageView.ScaleType.FIT_CENTER); //
		// 设置保持纵横比居中缩放图像
		// imageView.setLayoutParams(new ImageSwitcher.LayoutParams(
		// LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
		// return imageView; // 返回imageView对象
		// }
		//
		// });
		/********************** 使用BaseAdapter指定要显示的内容 *****************************/

		gallery.setAdapter(adapter); // 将适配器与Gallery关联
		/*********************************************************************************/
		gallery.setSelection(imageId.length / 2); // 让中间的图片选中
		gallery.setOnItemSelectedListener(new OnItemSelectedListener() {

			@Override
			public void onItemSelected(AdapterView<?> parent, View view,
					int position, long id) {
				imageSwitcher.setImageResource(imageId[position]);// 显示选中的图片
				currentPosition = position;
				// position_current = position;
				Log.i("dony", "currentPosition========="   currentPosition);
			}

			@Override
			public void onNothingSelected(AdapterView<?> arg0) {
			}

		});
	}

	class Adapter extends BaseAdapter {

		private int position;

		@SuppressWarnings("deprecation")
		@Override
		public View getView(int position, View convertView, ViewGroup parent) {
			ImageView imageview; // 声明ImageView的对象
			if (convertView == null) {
				imageview = new ImageView(MainActivity.this); // 实例化ImageView的对象
				imageview.setScaleType(ImageView.ScaleType.FIT_XY); // 设置缩放方式
				imageview.setLayoutParams(new Gallery.LayoutParams(180, 135));
				TypedArray typedArray = obtainStyledAttributes(R.styleable.Gallery);
				imageview.setBackgroundResource(typedArray.getResourceId(
						R.styleable.Gallery_android_galleryItemBackground, 0));
				imageview.setPadding(5, 0, 5, 0); // 设置ImageView的内边距
			} else {
				imageview = (ImageView) convertView;
			}
			this.position = position;
			imageview.setImageResource(imageId[position]); // 为ImageView设置要显示的图片
			Log.i("dony", "adapter position"   position);
			return imageview; // 返回ImageView
		}

		public int getPosition() {
			return this.position;
		}

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

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

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

	@Override
	public boolean onTouch(View v, MotionEvent event) {
		switch (event.getAction()) {
		case MotionEvent.ACTION_DOWN: {
			// 手指按下的X坐标
			downX = event.getX();
			break;
		}
		case MotionEvent.ACTION_UP: {
			float lastX = event.getX();
			// 抬起的时候的X坐标大于按下的时候就显示上一张图片
			if (lastX - downX > 100) {
				if (currentPosition > 0) {
					// 设置动画，这里的动画比较简单，不明白的去网上看看相关内容
					imageSwitcher.setInAnimation(AnimationUtils.loadAnimation(
							getApplication(), R.anim.left_in));
					imageSwitcher.setOutAnimation(AnimationUtils.loadAnimation(
							getApplication(), R.anim.right_out));
					currentPosition--;
					gallery.setSelection(currentPosition);
					Log.i("dony", "当前currentPosition====="   currentPosition);
					imageSwitcher.setImageResource(imageId[currentPosition
							% imageId.length]);
				} else {
					Toast.makeText(getApplication(), "已经是第一张",
							Toast.LENGTH_SHORT).show();
				}
			}

			if (downX - lastX > 100) {
				if (currentPosition < imageId.length - 1) {
					imageSwitcher.setInAnimation(AnimationUtils.loadAnimation(
							getApplication(), R.anim.right_in));
					imageSwitcher.setOutAnimation(AnimationUtils.loadAnimation(
							getApplication(), R.anim.lift_out));
					currentPosition  ;
					gallery.setSelection(currentPosition);
					Log.i("dony", "当前currentPosition====="   currentPosition);
					imageSwitcher.setImageResource(imageId[currentPosition]);

				} else {
					Toast.makeText(getApplication(), "到了最后一张",
							Toast.LENGTH_SHORT).show();
				}
			}

			if (lastX == downX) {
				if (flag == false) {
					Log.i("dony", "flag========false");
					galler_visble.setVisibility(View.VISIBLE);
					alphaImpl_in(v);
					flag = true;
				} else if (flag == true) {
					Log.i("dony", "flag========true");
					galler_visble.setVisibility(View.GONE);
					alphaImpl_out(v);
					flag = false;
				}
			}
		}

			break;
		}

		return true;
	}

	@Override
	public View makeView() {
		final ImageView i = new ImageView(this);
		i.setBackgroundColor(0xff000000);
		i.setScaleType(ImageView.ScaleType.CENTER_CROP);
		i.setLayoutParams(new ImageSwitcher.LayoutParams(
				LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
		return i;
	}

	// 设置淡入动画
	public void alphaImpl_in(View v) {

		Animation animation = AnimationUtils.loadAnimation(this,
				android.R.anim.fade_in);
		galler_visble.startAnimation(animation);
	}

	// 设置淡入动画
	public void alphaImpl_out(View v) {

		Animation animation = AnimationUtils.loadAnimation(this,
				android.R.anim.fade_out);
		galler_visble.startAnimation(animation);
	}
}