利用Camera实现图片叠加效果
先看看效果：


主要是利用了android.graphics.Camera类和android.graphics.Matrix还有处理View的onTouchEvent事件

 @Overrideprotected void onDraw(Canvas canvas) { super.onDraw(canvas); transformationImage(canvas,list.size());}

private void transformationImage(Canvas canvas,int size){Paint paint = new Paint();//paint.setAlpha(230);paint.setAntiAlias(true);for(int i = 0 ;i<size;i++){mCamera.save();mCamera.translate((size-i)*10.0f, 0.0f,-60.0f*(size-i));mCamera.rotateY(-30.0f);mCamera.getMatrix(matrix);matrix.preScale((float)(i+1)/(float)(size), (float)(i+1)/(float)(size));matrix.preTranslate(-centerX, -centerY);matrix.postTranslate(centerX, centerY);canvas.drawBitmap(list.get((5-currentIndex+i)%5), matrix, paint);mCamera.restore();}}

 @Override public boolean onTouchEvent(MotionEvent event) { int x = (int) event.getX(); int y = (int) event.getY();  int dx; int dy;    switch(event.getAction()) {  case MotionEvent.ACTION_DOWN:  mLastMotionX = x;  mLastMotionY = y;  break;  case MotionEvent.ACTION_MOVE:   dx = x - mLastMotionX;   dy = y - mLastMotionY;   mLastMotionX = x;   mLastMotionY = y;   if(dx<0&&Math.abs(dx)>30){   currentIndex--;   if(currentIndex<1){   currentIndex = 5;   }   }else if(dx>0&&Math.abs(dx)>30){   currentIndex++;   if(currentIndex>5){   currentIndex = 1;   }   }   break;  case MotionEvent.ACTION_UP:  break;  } invalidate(); return true; }  @Override public void dispatchDraw(Canvas canvas) {  super.dispatchDraw(canvas); }