先看效果圖：

public class FastScrollView extends ScrollView { private Rect mBarRect = new Rect(); private int mScrollExWidth; private int mScrollExHeight; private boolean mScrollStart; private int dx, dy; private int mRightPadding; public FastScrollView(Context context) {super(context);init(); } public FastScrollView(Context context, AttributeSet attrs) {super(context, attrs);init(); } public FastScrollView(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);init(); } private void init() {mScrollExWidth = dip2px(16); //擴展拖動區域寬度，可自行修改mScrollExHeight = dip2px(50); //擴展拖動區域高度，可自行修改 } @Override public boolean dispatchTouchEvent(MotionEvent ev) {switch (ev.getAction() & ev.getActionMasked()) { case MotionEvent.ACTION_DOWN://Log.e('fly', 'down');mScrollStart = false;if (canScroll()) { dx = (int) ev.getX(); dy = (int) ev.getY(); float scrollPos = (float) getHeight() / getChildView().getHeight(); int barHeight = (int) (scrollPos * getHeight()); //Log.e('fly', scrollPos+', '+ barHeight); mBarRect.left = getWidth() - mRightPadding - getVerticalScrollbarWidth(); mBarRect.right = getWidth() - mRightPadding; mBarRect.top = (int) (getScrollY() * scrollPos); mBarRect.bottom = mBarRect.top + barHeight; //Dbg.print(mBarRect.left, mBarRect.right, mBarRect.top, mBarRect.bottom, dx, dy); if (dx >= mBarRect.left - mScrollExWidth && dx < mBarRect.right && dy >= mBarRect.top - mScrollExHeight && dy < mBarRect.bottom + mScrollExHeight) {//Log.e('fly', 'mScrollStart');mScrollStart = true; }}break; case MotionEvent.ACTION_MOVE:if (mScrollStart) { int offsetY = (int) ev.getY() - dy; //Log.e('fly', 'move: ' + ev.getY()); int top = mBarRect.top + offsetY; float scrollPos = (float) top / getHeight(); int scrollY = (int) (scrollPos * getChildView().getHeight()); if (scrollY < 0) {scrollY = 0; } if (scrollY > getChildView().getHeight() - getHeight()) {scrollY = getChildView().getHeight() - getHeight(); } setScrollY(scrollY); return true;}break;}return super.dispatchTouchEvent(ev); } private boolean canScroll() {View child = getChildView();if (child != null && child.getHeight() > getHeight()) { return true;} else { return false;} } private View getChildView() {if (getChildCount() > 0) { return getChildAt(0);} else { return null;} } private int dip2px(float dpValue) {final float scale = getContext().getResources().getDisplayMetrics().density;return (int) (dpValue * scale + 0.5f); } /** * 這里不用view的paddding，用于預留特殊空隙 * * @param mRightPadding */ public void setRightPadding(int mRightPadding) {this.mRightPadding = mRightPadding; }}

布局中設置了大滾動條樣式，滾動時更加明顯：

<com.zwxuf.apkparserdemo.FastScrollViewandroid:id='@+id/mScrollView'android:layout_width='0dp'android:layout_weight='1'android:scrollbarSize='10dp' android:paddingRight='10dp'android:scrollbarThumbVertical='@drawable/fast_scroll_thumb_drawable'android:layout_height='match_parent'> <HorizontalScrollViewandroid:layout_width='match_parent'android:layout_height='match_parent' > <EditTextandroid:id='@+id/et_xml'android:layout_width='wrap_content'android:layout_height='wrap_content'android:background='@null'android:editable='false'android:textColor='#000000'android:textSize='10sp'android:typeface='monospace'/></HorizontalScrollView> </com.zwxuf.apkparserdemo.FastScrollView>

同理，可以依此制作快速滾動的 HorizontalScrollView。

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