Android 图片轮番 继承ViewGroup实现 可以直接使用

代码有注释应该都能看的懂

上代码：

import java.util.ArrayList;import android.content.Context;import android.graphics.Bitmap;import android.os.Handler;import android.os.Message;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.VelocityTracker;import android.view.View;import android.view.ViewGroup;import android.widget.ImageView;import android.widget.Scroller;public class ImageViewGroup extends ViewGroup {private InageViewGardenSwitch gardenSwitch = null;//用于返回当前界面的编号（对外编号）private Context mContext;private Scroller mScroller = null;//滑动动画private int cens = 0;//当前显示界面的编号（初始值为0   0是中间  比如有五张图片那么0代表第三张图片，排序是-2，-1，0，1，2）/*总共view的数量总共图片数量为当前图片加2，因为这图片循环是伪无限循环， 需要添两张图片作为过渡，这两张图片添加规则为：比如有5张图片1，2，3，4，5      进来的图片的编号5，1，2，3，4，5，1   添加两张图片之后的队列-3，-2，-1，0，1，2，3   重新编号*/private int max = 0;//最左边的view编号 （添加两张图片后的最左边位置）private int leftJump = 0;//同上方向是右边private int rightJump = 0;//如果当前显示为最左边的图片则跳转的目标图片编号private int targetRight = 0;private int targetLeft = 0;//同上private boolean isTouch = false;//判断手指是否在控件上（是则不执行自动跳转）private static final int TOUCH_STATE_REST = 0;private static final int TOUCH_STATE_SCROLLING = 1;private int mTouchState = TOUCH_STATE_REST;private boolean isThread = true;//自动跳转线程开关//--------------------------public static int  SNAP_VELOCITY = 600 ;private int mTouchSlop = 0 ;private float mLastionMotionX = 0 ;private VelocityTracker mVelocityTracker = null ;private int sizeWidth = 0;//控件的宽度private int sizeHeight= 0;//控件的高度public ImageViewGroup(Context context, AttributeSet attrs) {super(context, attrs);// TODO Auto-generated constructor stubthis.mContext = context;mScroller = new Scroller(context);}/** 滑动到下一张图片*/public void startMove(){if(cens == rightJump){cens = leftJump + 1;}cens++ ;mScroller.startScroll((cens-1)*getWidth(), 0,getWidth(), 0,2000);invalidate();theCurrentlyDisplayed();}/** 开启线程定时滑动到下一张图片*/public void timingMove(){Handler handler = new Handler(){/* (non-Javadoc)* @see android.os.Handler#handleMessage(android.os.Message)*/@Overridepublic void handleMessage(Message msg) {// TODO Auto-generated method stubsuper.handleMessage(msg);if(!isTouch){//判断当时是不是在执行手势if(mScroller != null){//判断当前是不是正在执行动画startMove();}}}};new Thread(new timing(handler)).start();}//线程定时class timing implements Runnable{private Handler handler;public timing(Handler handler) {// TODO Auto-generated constructor stubthis.handler = handler;}@Overridepublic void run() {while (isThread) {try {Thread.sleep(4000);handler.sendMessage(new Message());} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}/** 初始化*/@Overridepublic void computeScroll() {// TODO Auto-generated method stubif (mScroller.computeScrollOffset()) {scrollTo(mScroller.getCurrX(), mScroller.getCurrY());postInvalidate();}else{}}/** 设置图片并在首尾添加过渡图片*/public void setListImageView(ArrayList<Bitmap> list,InageViewGardenSwitch gardenSwitch){this.gardenSwitch = gardenSwitch;if(list != null && list.size() != 0){ImageView top = new ImageView(mContext);top.setImageBitmap(list.get(list.size()-1));addView(top);for (int i = 0; i < list.size(); i++) {ImageView img = new ImageView(mContext);img.setImageBitmap(list.get(i));addView(img);}ImageView buttom = new ImageView(mContext);buttom.setImageBitmap(list.get(0));addView(buttom);}}/** 手势监听*/@Overridepublic boolean onTouchEvent(MotionEvent event) {// TODO Auto-generated method stubif(mVelocityTracker == null){mVelocityTracker = VelocityTracker.obtain();}mVelocityTracker.addMovement(event);super.onTouchEvent(event);float x = event.getX();float y = event.getY();switch (event.getAction()) {case MotionEvent.ACTION_DOWN:isTouch = true;//设置手势正在监听中if(mScroller != null){//判断当前是否在执行动画mScroller.abortAnimation();//停止动画}if(cens == leftJump){//判断当前显示是否是最左边的图片scrollBy(targetRight, 0);//跳转到最右侧-1的图片cens = rightJump - 1;}if(cens == rightJump){//同上scrollBy(targetLeft, 0);cens = leftJump + 1;}mLastionMotionX = x;break;case MotionEvent.ACTION_MOVE:isTouch = true;int dataX = (int)(mLastionMotionX - x);scrollBy(dataX, 0);mLastionMotionX = x;break;case MotionEvent.ACTION_UP:isTouch = false;final VelocityTracker velocityTracker = mVelocityTracker;velocityTracker.computeCurrentVelocity(1000);int velocityX = (int) velocityTracker.getXVelocity();System.out.println(velocityX+"aa");if(velocityX > SNAP_VELOCITY){snapToScreen(cens - 1);}else if(velocityX < -SNAP_VELOCITY){snapToScreen(cens + 1);}else{snapToDestination();}if (mVelocityTracker != null) {mVelocityTracker.recycle();mVelocityTracker = null;}mTouchState = TOUCH_STATE_REST ;case MotionEvent.ACTION_CANCEL:mTouchState = TOUCH_STATE_REST ;break;default:break;}return true;}public boolean commOnTouchEvent(MotionEvent ev) {// TODO Auto-generated method stubfinal int action = ev.getAction();if ((action == MotionEvent.ACTION_MOVE) && (mTouchState != TOUCH_STATE_REST)) {return true;}final float x = ev.getX();final float y = ev.getY();switch (action) {dd23case MotionEvent.ACTION_MOVE:final int xDiff = (int) Math.abs(mLastionMotionX - x);if (xDiff > mTouchSlop) {mTouchState = TOUCH_STATE_SCROLLING;}break;case MotionEvent.ACTION_DOWN:mLastionMotionX = x;mTouchState = mScroller.isFinished() ? TOUCH_STATE_REST : TOUCH_STATE_SCROLLING;break;case MotionEvent.ACTION_CANCEL:case MotionEvent.ACTION_UP:mTouchState = TOUCH_STATE_REST;break;}return mTouchState != TOUCH_STATE_REST;}private void snapToDestination(){int destScreen = (getScrollX() + getWidth() / 2 ) / getWidth() ;snapToScreen(destScreen);}private void snapToScreen(int whichScreen){cens = whichScreen;int dx = (cens)*getWidth() - getScrollX();int time = Math.abs(dx) * 2;mScroller.startScroll(getScrollX(), 0, dx, 0,time);invalidate();System.out.println(cens);theCurrentlyDisplayed();}@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {// TODO Auto-generated method stubsuper.onMeasure(widthMeasureSpec, heightMeasureSpec);sizeWidth = MeasureSpec.getSize(widthMeasureSpec);sizeHeight = MeasureSpec.getSize(heightMeasureSpec);setMeasuredDimension(sizeWidth, sizeHeight);}@Overrideprotected void onLayout(boolean arg0, int arg1, int arg2, int arg3, int arg4) {// TODO Auto-generated method stubint count = getChildCount();int ce = 0;System.out.println(count);if(count <= 2)return;int childL = 0;int childR = sizeWidth;int childLs = 0;int childRs = sizeWidth;ce = count/2;View cen = getChildAt(ce);cen.layout(childL, 0, childR, sizeHeight);for (int i = ce+1; i < count; i++) {View view = getChildAt(i);childL+=sizeWidth;childR+=sizeWidth;view.layout(childL, 0, childR, sizeHeight);}for (int i = ce-1; i >= 0; i--) {View view = getChildAt(i);childLs-=sizeWidth;childRs-=sizeWidth;view.layout(childLs, 0, childRs, sizeHeight);}max = count;leftJump = -count/2;if(count%2 == 0){rightJump = count / 2 - 1;}else{rightJump = count / 2;}targetRight = (max - 2)*sizeWidth;targetLeft = -(max - 2)*sizeWidth;if(isTiming){timingMove();}isTiming = false;}private boolean isTiming = true;@Overrideprotected void onDetachedFromWindow() {// TODO Auto-generated method stubsuper.onDetachedFromWindow();isThread = false;}public void theCurrentlyDisplayed(){System.out.println(cens +"dangqiande "+leftJump);if(cens == leftJump)gardenSwitch.onSwitch((max-2)-1);else      if(cens == rightJump)gardenSwitch.onSwitch(0);elsegardenSwitch.onSwitch(cens - (leftJump+1));}//手势监听获取@Overridepublic boolean dispatchTouchEvent(MotionEvent ev) {getParent().requestDisallowInterceptTouchEvent(true);super.dispatchTouchEvent(ev);commOnTouchEvent(ev);return true;}}

//接口类  用于返回当前显示的是第几张图片。

public interface InageViewGardenSwitch {public void onSwitch(int i);}

使用方法：

xml:

<main.diyview.ImageViewGroupandroid:id="@+id/homePageImageGroup"android:layout_width="match_parent"android:layout_height="match_parent"></main.diyview.ImageViewGroup>

activity:

public class main extends Activity implements InageViewGardenSwitch{

   private ImageViewGroup imageViewGroup;

   protected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);

    setContentView(R.layout.home_page);imageViewGroup = (ImageViewGroup)findViewById(R.id.homePageImageGroup);

ArrayList<Bitmap> imagelist = new ArrayList<Bitmap>();

Bitmap bitmap1 = BitmapFactory.decodeResource(this.getResources(), R.drawable.banner1); Bitmap bitmap2 = BitmapFactory.decodeResource(this.getResources(), R.drawable.banner2); Bitmap bitmap3 = BitmapFactory.decodeResource(this.getResources(), R.drawable.banner3); imagelist.add(bitmap1); imagelist.add(bitmap2); imagelist.add(bitmap3); imageViewGroup.setListImageView(imagelist, this);  

}

   @Override   public void onSwitch(int i) {

//返回当前显示第几张图片  可以用于小圆点切换

}

}

代码可能有一些错误 或者可以优化的地方请指出