ImageSwitcher 右向左滑动的实现方式

imgSwitcher.setOnTouchListener(new OnTouchListener() {

            @Override
            public boolean onTouch(View v, MotionEvent event) {
                // TODO Auto-generated method stub

                if (event.getAction() == MotionEvent.ACTION_DOWN) {

                    downX = (int) event.getX(); // 取得按下时的坐标

                    Log.i("event.getX()", " downX " + downX);
                    return true;
                } else if (event.getAction() == MotionEvent.ACTION_UP) {

                    upX = (int) event.getX(); // 取得松开时的坐标

                    Log.i("event.getX()", " upX " + downX);

                    // 从左拖到右，即看前一张
                    if (upX - downX > 100) {

                        imgSwitcher.setInAnimation(AnimationUtils
                                .loadAnimation(firstActivity.this,
                                        android.R.anim.slide_in_left));
                        imgSwitcher.setOutAnimation(AnimationUtils
                                .loadAnimation(firstActivity.this,
                                        android.R.anim.slide_out_right));
                        curIndex--;

                        if (curIndex < 0) {
                            curIndex = 5;
                        }

                        imgSwitcher.setImageResource(IMAGE_LIST[curIndex]);
                        firstActivity.this.switchTitle(curIndex);

                    } else if (downX - upX > 100) { // 从右拖到左，即看后一张

                        imgSwitcher.setInAnimation(AnimationUtils
                                .loadAnimation(firstActivity.this,
                                        R.anim.slide_out_left));
                        imgSwitcher.setOutAnimation(AnimationUtils
                                .loadAnimation(firstActivity.this,
                                        R.anim.slide_in_right));
                        curIndex++;
                        if (curIndex > 5) {
                            curIndex = 0;
                        }
                        imgSwitcher.setImageResource(IMAGE_LIST[curIndex]);
                        firstActivity.this.switchTitle(curIndex);
                    }
                    return true;
                }
                return false;
            }
        });