ListView去滑动效果

平台：Android2.1
场景：Eink电子书项目，滑动效果会严重影响屏幕的刷新显示。
时间：2011.8.24

前提：
1.ListView继承与AbsListView，主要实现代码都在AbsListView中。

2.其onTouchEvent()函数，对滑动动作做了设置和响应。原理是根据手指在屏幕上的滑动，计算出移动距离，如果足够，则触发滑动。当滑动时，又根据滑动的快慢，计算出滑动的速度值，并不停的连续响应Action_Move动作，不停的小距离滑动，刷新。最后通过一个滑动优化函数，使得滑动显示出的锯齿感的效果明显减弱。

3.滑动函数为trackMotionScroll(),而且滑动优化函数为mFlingRunnable.start()。

4.具体修改，注释Action_Move中滑动函数，同时计算滑动函数需要的2个参数，得出每次屏幕触动完成后的总值。在Action_Up中，调用trackMotionScroll()(此时传入值为之前Action_Move中计算出的总值)，同时将其下面的滑动超出判断部分同时加入到其后面。注释掉滑动优化函数。

修改：

+    /* + * my data used for scroll + */
+    private int totaldeltaY = 0;
+    private int totalincrementalDeltaY = 0;

 // No need to do all this work if we're not going to move anyway
                     if (incrementalDeltaY != 0) {
- trackMotionScroll(deltaY, incrementalDeltaY); +                       //<BB><AC><B6><AF><BA><AF><CA><FD>
+                     //   trackMotionScroll(deltaY, incrementalDeltaY);
+                       totaldeltaY += deltaY;
+                       totalincrementalDeltaY += incrementalDeltaY;
+
+
+
                     }

- // Check to see if we have bumped into the scroll limit - View motionView = this.getChildAt(mMotionPosition - mFirstPosition); - if (motionView != null) { - // Check if the top of the motion view is where it is - // supposed to be - if (motionView.getTop() != mMotionViewNewTop) { - // We did not scroll the full amount. Treat this essentially like the - // start of a new touch scroll - final int motionPosition = findMotionRow(y); - - mMotionCorrection = 0; - motionView = getChildAt(motionPosition - mFirstPosition); - mMotionViewOriginalTop = motionView.getTop(); - mMotionY = y; - mMotionPosition = motionPosition; - } - } 

             case TOUCH_MODE_SCROLL:
+
+
+
+
+
+ //<BB><AC><B6><AF><BA><AF><CA><FD>
+ trackMotionScroll(totaldeltaY, totalincrementalDeltaY);
+ //<BB><AC><B6><AF><BA><AF><CA><FD>
+ trackMotionScroll(totaldeltaY, totalincrementalDeltaY);
+
+ // Check to see if we have bumped into the scroll limit
+ View motionView = this.getChildAt(mMotionPosition - mFirstPosition);
+ if (motionView != null) {
+ // Check if the top of the motion view is where it is
+ // supposed to be
+
+
+ if (motionView.getTop() != mMotionViewNewTop) {
+
+
+ // We did not scroll the full amount. Treat this essentially like the
+ // start of a new touch scroll
+
+ final int mmotionPosition = findMotionRow(y);
+
+ mMotionCorrection = 0;
+ motionView = getChildAt(mmotionPosition - mFirstPosition);
+ mMotionViewOriginalTop = motionView.getTop();
+ mMotionY = y;
+ mMotionPosition = mmotionPosition;
+
+ }
+ }
+ totaldeltaY = 0;
+ totalincrementalDeltaY = 0;

                             reportScrollStateChange(OnScrollListener.SCROLL_STATE_FLING);
-                            mFlingRunnable.start(-initialVelocity);
+                            //<BB><AC><B6><AF>Ч<B9><FB><D3>Ż<AF><BA><AF><CA><FD>
+                      //      mFlingRunnable.start(-initialVelocity);

             if (!awakenScrollBars()) {
                 invalidate();
             }
-            mMotionViewNewTop = mMotionViewOriginalTop + deltaY;
+    // mMotionViewNewTop = mMotionViewOriginalTop + deltaY;

@@ -2517,11 +2668,12 @@ public abstract class AbsListView extends AdapterView<ListAdapter> implements Te } } - mMotionViewNewTop = mMotionViewOriginalTop + deltaY; + // mMotionViewNewTop = mMotionViewOriginalTop + deltaY; 

后话：
刚接触android framework做的第一次改动。当时编译ROM烧录开不了机，连log都不会抓，只会不停的make clean，make。然后祈祷烧录后能够正常开机。
没调试方法，没代码阅读能力，硬着头皮，勉强改了出来。