用ImageSwitcher实现图片的动画切换
实现图片的从左到右或者从右到左的出场入场动画，看代码：
private ImageSwitcher mShowPicArea = null;......mShowPicArea.setOnTouchListener(new View.OnTouchListener() {private float downX;@Overridepublic boolean onTouch(View v, MotionEvent event) {switch(event.getAction()) {case MotionEvent.ACTION_DOWN:downX = event.getX();break;case MotionEvent.ACTION_UP:int totalCount = getPictureCount();if(event.getX()+60 < downX && selectPosition < totalCount-1) {// to next image, the distance of gesture should be longer than 100 int selection = selectPosition+1;updateSelectedImage(selection, TO_RIGHT);} else if(event.getX()-60 > downX && selectPosition > 0){// to previous imageint selection = selectPosition - 1;updateSelectedImage(selection, TO_LEFT);}break;}return true;}private void updateSelectedImage(int selection, boolean toRight) {if(toRight) {mShowPicArea.setInAnimation(AnimationUtils.loadAnimation(PictureSlideActivity.this,android.R.anim.slide_in_left));mShowPicArea.setOutAnimation(AnimationUtils.loadAnimation(PictureSlideActivity.this,android.R.anim.slide_out_right));} else {mShowPicArea.setInAnimation(AnimationUtils.loadAnimation(PictureSlideActivity.this,R.anim.slide_in_right));mShowPicArea.setOutAnimation(AnimationUtils.loadAnimation(PictureSlideActivity.this,R.anim.slide_out_left));}showImage(selection);selectPosition = selection;mPictureSlide.setSelection(selectPosition);updateGallerySelection(selectPosition);}});?实现一个OnTouchListener，实现onTouch方法，捕获滑动的操作，当滑动超过60dip后触发图片切换动作