通过自定义ListView实现元素前移后退的动画特效，被点击元素A向前移，A之前元素往后移动.
具体的动画效果如下(效果图是丑了点，有录制gif图片软件请推荐一下吧)：
重点在于动画的，具体代码如下：
package com.open.widget;
import java.util.ArrayList;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PaintFlagsDrawFilter;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.os.Handler;
import android.util.AttributeSet;
import android.util.Log;
import android.view.GestureDetector;
import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.MotionEvent;
import android.view.View;
/**
*
* @author yanglonghui
*
*/
public class HorImageListView extends View {
private int current_OffsetX=0;//当前屏X轴的偏移量
private int cuurent_OffsetY=0;//当前屏Y轴的偏移量
private int moving_OffsetX=0;//当前S手势X轴偏移量
private int moving_OffsetY=0;//当前S手势Y轴偏移量
private int current_Page=1;//当前页码，开始页码为1
private int portraitNumberPerScreen;//每屏头像个数
private int charHeight=0;//一个字的高度
private int maxPage=1;//最大页码
private int current_foucsIndex=0;//当前焦点
private int current_longPressIndex=-1;//当前长按焦点
private int current_clickIndex=0;//当前点击
private int headWidth=0;//头像宽度
private int paddingLeft;//左边距
private Bitmap []bitmapArray;//头像数组
private Rect headRectArray[]=null;//头像位置
private Rect drawingRect=new Rect();
private Bitmap mCircleBitmap=null;
private PorterDuffXfermode xfermode=new PorterDuffXfermode(PorterDuff.Mode.MULTIPLY);
private PaintFlagsDrawFilter pdf=new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG|Paint.FILTER_BITMAP_FLAG);
private Paint paint = new Paint();
{
paint.setStyle(Paint.Style.STROKE);
paint.setFlags(Paint.ANTI_ALIAS_FLAG);
paint.setAntiAlias(true);// 设置画笔的锯齿效果。 true是去除，大家一看效果就明白了
}
private static final int LAYER_FLAGS = Canvas.MATRIX_SAVE_FLAG |
Canvas.CLIP_SAVE_FLAG |
Canvas.HAS_ALPHA_LAYER_SAVE_FLAG |
Canvas.FULL_COLOR_LAYER_SAVE_FLAG |
Canvas.CLIP_TO_LAYER_SAVE_FLAG;
private IHeadClick headClickListener;
private Handler mHandler=new Handler();
private ArrayList<String> headList=new ArrayList<String>();
public HorImageListView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}
public HorImageListView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public HorImageListView(Context context) {
super(context);
init();
}
private void init()
{
try {
if(android.os.Build.VERSION.SDK_INT>=11)
{
setLayerType(LAYER_TYPE_SOFTWARE, null);
}
} catch (Exception e) {
e.printStackTrace();
}
mGestureDetector=new GestureDetector(new CusGestureListener());
setLongClickable(true);
setOnTouchListener(onTouchListener);
}
public void setAdapter(ArrayList<String> headList)
{
this.headList=headList;
current_Page=1;
current_OffsetX=0;
current_clickIndex=0;
current_foucsIndex=0;
current_longPressIndex=-1;
if(headWidth==0)
{
headWidth=DensityUtil.dip2px(getContext(), 60);
}
mCircleBitmap=WindowMgr.getInstance().getCircleBitmap(headWidth, headWidth);
bitmapArray=WindowMgr.getInstance().getAllBitmaps(headList);
headRectArray=new Rect[bitmapArray.length];
for(int i=0;i<headRectArray.length;i++)//随时滑动
{
headRectArray[i]=new Rect();
}
requestLayout();
invalidate();
}
private void calculate()
{
if(getMeasuredWidth()<=0)
{
return;
}
portraitNumberPerScreen=getMeasuredWidth()/headWidth;
portraitNumberPerScreen--;//少一个元素，使不会那么拥挤
paddingLeft=(int)((float)(getMeasuredWidth()-portraitNumberPerScreen*headWidth)/(float)(portraitNumberPerScreen+1)+0.5f);
if(bitmapArray.length>portraitNumberPerScreen)
{
maxPage=(bitmapArray.length%portraitNumberPerScreen==0)?bitmapArray.length/portraitNumberPerScreen:this.bitmapArray.length/portraitNumberPerScreen+1;
}
else
{
maxPage=1;
}
int left = 0;
int top = DensityUtil.dip2px(getContext(), 10);
int right = 0;
int bottom = top+headWidth;
for(int i=0;i<maxPage;i++)//分页效果
{
int pageWidthPadding=i*getMeasuredWidth();
for(int j=0;j<portraitNumberPerScreen&&(i*portraitNumberPerScreen+j)<bitmapArray.length;j++)
{
left=pageWidthPadding+paddingLeft*(j+1)+j*headWidth;
right=left+headWidth;
headRectArray[i*portraitNumberPerScreen+j].set(left, top, right, bottom);
}
}
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int height=DensityUtil.dip2px(getContext(), 80);
setMeasuredDimension(MeasureSpec.getSize(widthMeasureSpec), height);
calculate();
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if(null!=bitmapArray)
{
if(current_clickIndex>0)
{
canvas.setDrawFilter(pdf);
for(int i=0;i<bitmapArray.length;i++)
{
drawingRect.left=headRectArray[i].left+current_OffsetX+clickOffsetBackDx;
drawingRect.top=headRectArray[i].top+cuurent_OffsetY;
drawingRect.right=headRectArray[i].right+current_OffsetX+clickOffsetBackDx;
drawingRect.bottom=headRectArray[i].bottom+cuurent_OffsetY;
if(i>current_clickIndex)//还需要优化
{
if(current_Page==1)
{
drawingRect.left=headRectArray[i].left+current_OffsetX;
drawingRect.top=headRectArray[i].top+cuurent_OffsetY;
drawingRect.right=headRectArray[i].right+current_OffsetX;
drawingRect.bottom=headRectArray[i].bottom+cuurent_OffsetY;
}
else if(current_Page>1)
{
}
}
if(drawingRect.right<getLeft())
{
continue;
}
else if(drawingRect.left>getRight())
{
break;
}
if(current_clickIndex!=i)
{
//绘制头像
canvas.drawBitmap(mCircleBitmap, null, drawingRect, paint);
paint.setXfermode(xfermode);
canvas.drawBitmap(bitmapArray[i], null, drawingRect, paint);
paint.setXfermode(null);
}
}
drawingRect.left=headRectArray[0].left+clickOffsetforwarDx;
drawingRect.top=headRectArray[0].top;
drawingRect.right=headRectArray[0].right+clickOffsetforwarDx;
drawingRect.bottom=headRectArray[0].bottom;
int sc = canvas.saveLayer(drawingRect.left, drawingRect.top, drawingRect.right, drawingRect.bottom, null,LAYER_FLAGS);
//绘制头像
canvas.drawBitmap(mCircleBitmap, null, drawingRect, paint);
paint.setXfermode(xfermode);
canvas.drawBitmap(bitmapArray[current_clickIndex], null, drawingRect, paint);
paint.setXfermode(null);
canvas.restoreToCount(sc);
}
else
{
canvas.setDrawFilter(pdf);
for(int i=0;i<bitmapArray.length;i++)
{
drawingRect.left=headRectArray[i].left+current_OffsetX+moving_OffsetX;
drawingRect.top=headRectArray[i].top+cuurent_OffsetY;
drawingRect.right=headRectArray[i].right+current_OffsetX+moving_OffsetX;
drawingRect.bottom=headRectArray[i].bottom+cuurent_OffsetY;
if(drawingRect.right<getLeft())
{
continue;
}
else if(drawingRect.left>getRight())
{
break;
}
if(current_longPressIndex==i)
{
int insetDx=(int)((float)drawingRect.height()/(float)8);
drawingRect.inset(insetDx, insetDx);
}
//绘制头像
canvas.drawBitmap(mCircleBitmap, null, drawingRect, paint);
paint.setXfermode(xfermode);
canvas.drawBitmap(bitmapArray[i], null, drawingRect, paint);
paint.setXfermode(null);
}
}
}
}
private OnTouchListener onTouchListener=new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
boolean isConsumed =mGestureDetector.onTouchEvent(event);
if (isConsumed) return true;
if(event.getAction()==MotionEvent.ACTION_CANCEL||event.getAction()==MotionEvent.ACTION_UP)
{
//----分页代码
int direct=0;//往左边为1，右边为-1,保持不变为0
if(moving_OffsetX>getMeasuredWidth()/2)//向右边滑过半屏
{
current_Page--;
direct=1;
if(current_Page<1)
{
current_Page=1;
direct=0;
}
}
else if(moving_OffsetX<-getMeasuredWidth()/2)//向左边滑过半屏
{
current_Page++;
direct=-1;
if(current_Page>maxPage)
{
current_Page=maxPage;
direct=0;
}
}
int old=current_OffsetX+moving_OffsetX;
int newX=current_OffsetX+direct*getMeasuredWidth();
if(direct!=0)
{
current_foucsIndex=(current_Page-1)*portraitNumberPerScreen;
if(null!=headClickListener)
headClickListener.onItemClick(current_foucsIndex);
}
Log.v("dx:"+current_OffsetX, "----------------------");
if(current_longPressIndex!=-1)
{
invalidate();
current_longPressIndex=-1;//恢复
return false;
}
else
{
mHandler.post(new SmoothRunnable(old, newX));
}
return false;
}
invalidate();
return isConsumed;
}
};
private GestureDetector mGestureDetector;
private class CusGestureListener extends SimpleOnGestureListener
{
private Rect mDragRect=new Rect();
@Override
public boolean onSingleTapUp(MotionEvent e) {
Log.v("CusGestureListener", "onSingleTapUp");
int x=(int) e.getX();
int y=(int) e.getY();
boolean isInner=false;
Rect mRect=new Rect();
for(int i=0;i<bitmapArray.length;i++)
{
mRect.left=headRectArray[i].left+current_OffsetX+moving_OffsetX;
mRect.top=headRectArray[i].top+cuurent_OffsetY;
mRect.right=headRectArray[i].right+current_OffsetX+moving_OffsetX;
mRect.bottom=headRectArray[i].bottom+cuurent_OffsetY;
if(!isInner)
{
if(mRect.top<=y&&mRect.bottom>=y)
{
isInner=true;
}
else
{
break;
}
}
if(mRect.contains(x, y))
{
current_foucsIndex=i;
current_clickIndex=i;
//动画：被点击向前移动，未点击向后移动
if(null!=mClickRunnable)
{
mClickRunnable.stop();
}
mClickRunnable=new ClickRunnable(current_clickIndex);
mHandler.post(mClickRunnable);
}
}
return super.onSingleTapUp(e);
}
@Override
public void onLongPress(MotionEvent e) {
// Log.v("CusGestureListener", "onLongPress");
int x=(int) e.getRawX();
int y=(int) (e.getRawY()-WindowMgr.getInstance().getStatusBarHeight(getContext()));
Rect mRect=new Rect();
for(int i=0;i<bitmapArray.length;i++)
{
mRect.left=headRectArray[i].left+current_OffsetX+moving_OffsetX;
mRect.top=headRectArray[i].top+cuurent_OffsetY;
mRect.right=headRectArray[i].right+current_OffsetX+moving_OffsetX;
mRect.bottom=headRectArray[i].bottom+cuurent_OffsetY;
if(mRect.contains(x, y))
{
current_longPressIndex=i;
return ;
}
}
super.onLongPress(e);
}
@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2,
float distanceX, float distanceY) {
// Log.v("CusGestureListener", "onScroll");
int tx=(int) e1.getRawX();
int ty=(int) (e1.getRawY()-WindowMgr.getInstance().getStatusBarHeight(getContext()));
int tx2=(int) e2.getRawX();
int ty2=(int) (e2.getRawY()-WindowMgr.getInstance().getStatusBarHeight(getContext()));
if(mDragRect.contains(tx, ty)&&mDragRect.contains(tx2, ty2))
{
moving_OffsetX=(int) (e2.getRawX()-e1.getRawX());
}
return super.onScroll(e1, e2, distanceX, distanceY);
}
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
float velocityY) {
// Log.d("CDH", "onFling currentPage:"+currentPage+" x1:"+e1.getRawX()+" x2:"+e2.getRawX()+" velocityX:"+velocityX+"velocityY:"+velocityY);
if (Math.abs(velocityX) < 1000) return false;
int direct=0;//往左边为1，右边为-1,保持不变为0
if(velocityX > 0)
{
current_Page--;
direct=1;
if(current_Page<1)
{
current_Page=1;
direct=0;
}
}
else
{
current_Page++;
direct=-1;
if(current_Page>maxPage)
{
current_Page=maxPage;
direct=0;
}
}
int old=current_OffsetX+moving_OffsetX;
int newX=current_OffsetX+direct*getMeasuredWidth();
mHandler.post(new SmoothRunnable(old, newX));
return true;
}
@Override
public void onShowPress(MotionEvent e) {
// Log.v("CusGestureListener", "onShowPress");
super.onShowPress(e);
}
@Override
public boolean onDown(MotionEvent e) {
// Log.v("CusGestureListener", "onDown");
moving_OffsetX=0;
mDragRect.set(getLeft(), getTop(), getRight(), getBottom());
return super.onDown(e);
}
@Override
public boolean onDoubleTap(MotionEvent e) {
// Log.v("CusGestureListener", "onDoubleTap");
return super.onDoubleTap(e);
}
@Override
public boolean onDoubleTapEvent(MotionEvent e) {
// Log.v("CusGestureListener", "onDoubleTapEvent");
return super.onDoubleTapEvent(e);
}
@Override
public boolean onSingleTapConfirmed(MotionEvent e) {
// Log.v("CusGestureListener", "onSingleTapConfirmed");
return super.onSingleTapConfirmed(e);
}
}
//平滑移动
private class SmoothRunnable implements Runnable
{
private int startDx;
private int endDx;
private long duration=250;
private long interval=10;
private long startTime;
private long endTime;
public SmoothRunnable(int startDx, int endDx) {
super();
this.startDx = startDx;
this.endDx = endDx;
}
@Override
public void run() {
if(startTime==0)
{
moving_OffsetX=0;
startTime=System.currentTimeMillis();
endTime=startTime+duration;
}
long currentTime=System.currentTimeMillis();
if(currentTime<endTime)
{
current_OffsetX=(int)(startDx+(endDx-startDx)*((float)(currentTime-startTime)/(float)(duration)));
invalidate();
mHandler.postDelayed(this, interval);
}
else
{
current_OffsetX=endDx;
moving_OffsetX=0;
invalidate();
}
}
}
private int clickOffsetforwarDx=0;
private int clickOffsetBackDx;
//点击移动到队头部,其他往后面移动
private ClickRunnable mClickRunnable=null;
private class ClickRunnable implements Runnable
{
private int current_clickIndex;
private int forwardDx=0;//到队列头部的总长度
private int backwardsDx=0;//到第二个的长度
private long duration=300;
private long interval=10;
private long startTime;
private long endTime;
public ClickRunnable(int current_clickIndex)
{
this.current_clickIndex=current_clickIndex;
duration=Math.max((long) (duration*(float)current_clickIndex/(float)portraitNumberPerScreen),duration);
duration=Math.min(duration, 700);
}
public void stop()
{
mHandler.removeCallbacks(this);
}
@Override
public void run() {
if(startTime==0)
{
Rect mRect=new Rect();
mRect.left=headRectArray[current_clickIndex].left+current_OffsetX+moving_OffsetX;
mRect.top=headRectArray[current_clickIndex].top+cuurent_OffsetY;
mRect.right=headRectArray[current_clickIndex].right+current_OffsetX+moving_OffsetX;
mRect.bottom=headRectArray[current_clickIndex].bottom+cuurent_OffsetY;
forwardDx=mRect.left-headRectArray[0].left;
int left=paddingLeft*2+headWidth;
int top=DensityUtil.dip2px(getContext(), 10);
Rect secord=new Rect(left,top, left+headWidth, top+headWidth);
backwardsDx=secord.left-headRectArray[0].left+Math.abs(current_OffsetX);
startTime=System.currentTimeMillis();
endTime=startTime+duration;
}
long currentTime=System.currentTimeMillis();
if(currentTime<endTime)
{
clickOffsetforwarDx=(int) (forwardDx-forwardDx*((float)(currentTime-startTime)/(float)(duration)));
clickOffsetBackDx=(int) (backwardsDx*((float)(currentTime-startTime)/(float)(duration)));
invalidate();
mHandler.postDelayed(this, interval);
}
else
{
clickOffsetforwarDx=0;
clickOffsetBackDx=0;
String tmp=headList.remove(current_clickIndex);
headList.add(0, tmp);
bitmapArray=WindowMgr.getInstance().getAllBitmaps(headList);
HorImageListView.this.current_clickIndex=0;
HorImageListView.this.current_Page=1;
HorImageListView.this.current_OffsetX=0;
HorImageListView.this.current_clickIndex=0;
HorImageListView.this.current_foucsIndex=0;
HorImageListView.this.current_longPressIndex=-1;
invalidate();
if(null!=headClickListener)
headClickListener.onItemClick(current_clickIndex);
}
}
}
public void setOnHeadClickListener(IHeadClick headClickListener)
{
this.headClickListener=headClickListener;
}
public static interface IHeadClick
{
public void onItemClick(int position);
}
}
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