ImageAdapter.java

/*
 * Copyright (C) 2011 Patrik �kerfeldt
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.viewflowtest.cjy;

import java.util.List;

import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.Toast;

import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.display.RoundedBitmapDisplayer;
import com.yooeee.ziyoutong.R;

public class ImageAdapter extends BaseAdapter {
//	private DisplayImageOptions options;
	protected ImageLoader imageLoader;
	private Context mContext;
	private List<String> list;
	private LayoutInflater mInflater;

	public ImageAdapter(Context context,List<String> list) {
		mContext = context;
		this.list = list;
		imageLoader = imageLoader.getInstance();
//		options = new DisplayImageOptions.Builder().showStubImage(R.drawable.ic_launcher).showImageForEmptyUri(R.drawable.ic_launcher).showImageOnFail(R.drawable.ic_launcher).cacheInMemory().cacheOnDisc().displayer(new RoundedBitmapDisplayer(15)).build();
		mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
	}

	@Override
	public int getCount() {
		return Integer.MAX_VALUE;   //返回很大的值使得getView中的position不断增大来实现循环
	}

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

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

	@Override
	public View getView(final int position, View convertView, ViewGroup parent) {
		if (convertView == null) {
			convertView = mInflater.inflate(R.layout.image_item, null);
		}
		ImageView imageView = ((ImageView) convertView.findViewById(R.id.imgView));
		imageLoader.displayImage(list.get(position%list.size()), imageView);
		convertView.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				Toast.makeText(mContext, "" + position, Toast.LENGTH_SHORT).show();
//				Intent intent = new Intent(mContext,ABSclass.class);
				Bundle bundle = new Bundle();
				bundle.putString("image_id", list.get(position%list.size()));
//				intent.putExtras(bundle);
//				mContext.startActivity(intent);
			}
		});
		return convertView;
	}

}

 
application中

@Override
	public void onCreate() {
		// 初始化下载图片jar包
		initImageLoader(getApplicationContext());
	}

	public static void initImageLoader(Context context)
	{
		ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(context).threadPriority(Thread.NORM_PRIORITY - 2).denyCacheImageMultipleSizesInMemory().discCacheFileNameGenerator(new Md5FileNameGenerator()).tasksProcessingOrder(QueueProcessingType.LIFO).enableLogging().build();

		ImageLoader.getInstance().init(config);
	}

 在你用的activity中加入

  viewFlow = (ViewFlow)findViewById(R.id.viewflow);
        viewFlow.setAdapter(new ImageAdapter(this));
        viewFlow.setmSideBuffer(3); // 实际图片张数， 我的ImageAdapter实际图片张数为3
        
        CircleFlowIndicator indic = (CircleFlowIndicator) findViewById(R.id.viewflowindic);
        viewFlow.setFlowIndicator(indic);
        viewFlow.setTimeSpan(4500);
        viewFlow.setSelection(3*1000);	//设置初始位置
        viewFlow.startAutoFlowTimer();  //启动自动播放

 
传个源码和网络获取图片的jar包

背景:对图片的部分区域进行点击,响应相应的事件(可对图片进行放大,边界反弹,以及图片移动)

针对于前次的热区点击做了个补充

 1.对图片的部分区域进行可响应事件

 2.对图片进行缩放后,仍可响应区域点击事件

 3.对图片进行移动后.仍可响应区域点击事件

 4.当图片移出边界区域后,可进行回弹.

其效果图如下(GIF图片较大,只截取一部分,在模拟器上,缩放效果无法演示)

 部分关键性代码:

 a.对点击的区域进行判断,

		/**
		 * 检测是否在区域范围内
		 * @param rectf 从外部传可以重用
		 * @param x
		 * @param y
		 * @return
		 */
		public boolean isInArea(RectF rectf, float x, float y) {
			boolean resStatus = false;
			if(this.path != null) {
				rectf.setEmpty();
				path.computeBounds(rectf, true);
				if(isRectF) {
					//当是矩形时
					resStatus = rectf.contains(x, y);
				}else {
					//如果是多边形时
					Region region = new Region();
					region.setPath(path, region);
					region.setPath(path, new Region((int)rectf.left, (int)rectf.top, (int)rectf.right, (int)rectf.bottom));
					resStatus = region.contains((int)x, (int)y);
				}
			}
			return resStatus;
		}

 b. 滑动或缩放完成后,是否移出边界检测

	/**
	 * 边界反弹事件检测
	 * @param event
	 */
	protected void upToCheckOutOfSide(MotionEvent event) {
		float scale = getCurrentScale();
		float[] moveXY = getCurrentMoveXY();
		float curBitWidth = scale * BIT_WIDTH;
		float curBitHeight = scale * BIT_HEIGHT;
		float[] dstXY = new float[2];
		boolean needMove = false;
		dstXY[0] = moveXY[0];
		dstXY[1] = moveXY[1];
		//当图片的高度小于视图高度时
		if(curBitHeight <= VIEW_HEIGHT) {
			needMove = true;
			dstXY[1] = (VIEW_HEIGHT - curBitHeight) / 2.0f;
		}
		
		//当图片的宽度小于视图宽度时
		if(curBitWidth <= VIEW_WIDTH) {
			needMove = true;
			dstXY[0] = (VIEW_WIDTH - curBitWidth) / 2.0f;
		}
		
		//当图片高度大于视图的高度时
		if(curBitHeight > VIEW_HEIGHT) {
			float distance = event.getY() - mPointF.y;
			//手向下滑动
			if(distance > 0) {
				if(moveXY[1] > 0) {
					dstXY[1] = 0;
					needMove = true;
				}
				//手向上滑动
			}else if(distance < 0) {
				float goalY = VIEW_HEIGHT - curBitHeight;
				if(moveXY[1] < goalY) {
					dstXY[1] = goalY;
					needMove = true;
				}
			}
		}
		//图片的当前宽度大小视图的高度时
		if(curBitWidth > VIEW_WIDTH) {
			float distance = event.getX() - mPointF.x;
			//向右滑动
			if(distance > 0) {
				if(moveXY[0] > 0) {
					dstXY[0] = 0;
					needMove = true;
				}
				//向左滑动
			}else if(distance < 0) {
				float goalX = VIEW_WIDTH - curBitWidth;
				if(moveXY[0] < goalX) {
					dstXY[0] = goalX;
					needMove = true;
				}
			}
		}
		
		if(needMove) {
			mViewHandler.postDelayed(new MoveRunnable(moveXY[0], moveXY[1], dstXY[0], dstXY[1]), 0);
		}
	}

 c.边界移动的Runnable

	/**
	 * 反弹时的动画线程
	 */
	protected class MoveRunnable implements Runnable {
		
		//移动的步长
		private final static int MOVE_STEEP = 20;
		//移动的方向
		private float direct;
		//是X方向上的移动还是Y方向上的移动
		private boolean isMoveX;
		
		private float srcX, srcY, dstX, dstY;
		
		//一元一次方程
		private float a, b;
		
		public MoveRunnable(float srcX,  float srcY, float dstX, float dstY) {
			this.srcX = srcX;
			this.srcY = srcY;
			this.dstX = dstX;
			this.dstY = dstY;
			//求解A，B
			if((dstY - srcY) != 0 && (dstX - srcX) != 0) {
				a = (dstY - srcY) / (dstX - srcX);
				b = dstY - a * dstX;
			}
			//以长的作为出发点
			isMoveX = Math.abs(srcX - dstX) > Math.abs(srcY - dstY);
			direct = isMoveX ? ((dstX - srcX) > 0 ? 1.0f : -1.0f) : ((dstY - srcY) > 0 ? 1.0f : -1.0f);
			isAnimation = true;
		}
		@Override
		public void run() {
			float distanceX = 0;
			float distanceY = 0;
			boolean isEnd = false;
			if(isMoveX) {
				distanceX = direct * MOVE_STEEP;
				srcX += distanceX;
				if(direct > 0) {
					if(srcX >= dstX) {
						isEnd = true;
						srcX -= distanceX;
						distanceX = dstX - srcX;
						srcX = dstX;
					}
				}else {
					if(srcX <= dstX) {
						isEnd = true;
						srcX -= distanceX;
						distanceX = dstX - srcX;
						srcX = dstX;
					}
				}
				
				if(a == 0 && b == 0) {
					distanceY = 0;
				}else {
					float tempY = a * srcX + b;
					distanceY = tempY - srcY;
					srcY = tempY;
				}
			}else {
				distanceY = direct * MOVE_STEEP;
				srcY += distanceY;
				if(direct > 0 ) {
					if(srcY >= dstY) {
						isEnd = true;
						srcY -= distanceY;
						distanceY = dstY - srcY;
						srcY = dstY;
					}
				}else {
					if(srcY <= dstY) {
						isEnd = true;
						srcY -= distanceY;
						distanceY = dstY - srcY;
						srcY = dstY;
					}
				}
				
				if(a == 0 && b == 0 ) {
					distanceX = 0;
				}else {
					float tempX = (srcY - b) / a;
					distanceX = tempX - srcX;
					srcX = tempX;
				}
			}
			mViewHandler.obtainMessage(0, new Float[]{distanceX, distanceY}).sendToTarget();
			if(!isEnd) {
				mViewHandler.postDelayed(this, 10);
			}else {
				isAnimation = false;
				LogUtils.d(TAG, isAnimation + ", End!");
			}
		}
	}

  其它的一些代码在程序中均已经做过注释