很多人用过ListViewFilter这个开源列表，做得确实相当不错，但是在使用的过程中好像有点bug，当点击右侧的字母时，总是会触发列表中的某一项的点击事件，这里就给出这个bug的解决办法，主要是IndexBarView.java和PinnedHeaderListView.java这两个文件：
1. PinnedHeaderListView.java
public class PinnedHeaderListView extends ListView implements IIndexBarFilter {
// interface object that configure pinned header view position in list view
IPinnedHeader mAdapter;
// view objects
View mHeaderView,mIndexBarView,mPreviewTextView;
// flags that decide view visibility
boolean mHeaderVisibility=false;
boolean mPreviewVisibility=false;
// initially show index bar view with it's content
boolean mIndexBarVisibility=true;
// context object
Context mContext;
// view height and width
int mHeaderViewWidth,
mHeaderViewHeight,
mIndexBarViewWidth,
mIndexBarViewHeight,
mIndexBarViewMargin,
mPreviewTextViewWidth,
mPreviewTextViewHeight;
// touched index bar Y axis position used to decide preview text view position
float mIndexBarY;
public PinnedHeaderListView(Context context) {
super(context);
this.mContext = context;
}
public PinnedHeaderListView(Context context, AttributeSet attrs) {
super(context, attrs);
this.mContext = context;
}
public PinnedHeaderListView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
this.mContext = context;
}
@Override
public void setAdapter(ListAdapter adapter) {
this.mAdapter = (PinnedHeaderAdapter)adapter;
super.setAdapter(adapter);
}
public void setPinnedHeaderView(View headerView) {
this.mHeaderView = headerView;
// Disable vertical fading when the pinned header is present
// TODO change ListView to allow separate measures for top and bottom fading edge;
// in this particular case we would like to disable the top, but not the bottom edge.
if (mHeaderView != null) {
setFadingEdgeLength(0);
}
}
public void setIndexBarView(View indexBarView) {
mIndexBarViewMargin = (int)mContext.getResources().getDimension(R.dimen.index_bar_view_margin);
this.mIndexBarView = indexBarView;
}
public void setPreviewView(View previewTextView) {
this.mPreviewTextView=previewTextView;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
if (mHeaderView != null) {
measureChild(mHeaderView, widthMeasureSpec, heightMeasureSpec);
mHeaderViewWidth = mHeaderView.getMeasuredWidth();
mHeaderViewHeight = mHeaderView.getMeasuredHeight();
}
if (mIndexBarView != null && mIndexBarVisibility) {
measureChild(mIndexBarView, widthMeasureSpec, heightMeasureSpec);
mIndexBarViewWidth = mIndexBarView.getMeasuredWidth();
mIndexBarViewHeight = mIndexBarView.getMeasuredHeight();
}
if (mPreviewTextView != null && mPreviewVisibility) {
measureChild(mPreviewTextView, widthMeasureSpec, heightMeasureSpec);
mPreviewTextViewWidth = mPreviewTextView.getMeasuredWidth();
mPreviewTextViewHeight = mPreviewTextView.getMeasuredHeight();
}
}
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
super.onLayout(changed, left, top, right, bottom);
if (mHeaderView != null) {
mHeaderView.layout(0, 0, mHeaderViewWidth, mHeaderViewHeight);
configureHeaderView(getFirstVisiblePosition());
}
if (mIndexBarView != null && mIndexBarVisibility) {
mIndexBarView.layout(getMeasuredWidth()- mIndexBarViewMargin - mIndexBarViewWidth, mIndexBarViewMargin
, getMeasuredWidth()- mIndexBarViewMargin, getMeasuredHeight()- mIndexBarViewMargin);
}
if (mPreviewTextView != null && mPreviewVisibility) {
mPreviewTextView.layout(mIndexBarView.getLeft()-mPreviewTextViewWidth, (int)mIndexBarY-(mPreviewTextViewHeight/2)
, mIndexBarView.getLeft(), (int)(mIndexBarY-(mPreviewTextViewHeight/2))+mPreviewTextViewHeight);
}
}
public void setIndexBarVisibility(Boolean isVisible) {
if(isVisible) {
mIndexBarVisibility=true;
}
else {
mIndexBarVisibility=false;
}
}
private void setPreviewTextVisibility(Boolean isVisible) {
if(isVisible) {
mPreviewVisibility=true;
}
else {
mPreviewVisibility=false;
}
}
public void configureHeaderView(int position) {
if (mHeaderView == null) {
return;
}
int state = mAdapter.getPinnedHeaderState(position);
switch (state) {
case IPinnedHeader.PINNED_HEADER_GONE:
mHeaderVisibility = false;
break;
case IPinnedHeader.PINNED_HEADER_VISIBLE:
if (mHeaderView.getTop() != 0) {
mHeaderView.layout(0, 0, mHeaderViewWidth, mHeaderViewHeight);
}
mAdapter.configurePinnedHeader(mHeaderView, position);
mHeaderVisibility = true;
break;
case IPinnedHeader.PINNED_HEADER_PUSHED_UP:
View firstView = getChildAt(0);
int bottom = firstView.getBottom();
// int itemHeight = firstView.getHeight();
int headerHeight = mHeaderView.getHeight();
int y;
if (bottom < headerHeight) {
y = (bottom - headerHeight);
}
else {
y = 0;
}
if (mHeaderView.getTop() != y) {
mHeaderView.layout(0, y, mHeaderViewWidth, mHeaderViewHeight + y);
}
mAdapter.configurePinnedHeader(mHeaderView, position);
mHeaderVisibility = true;
break;
}
}
@Override
protected void dispatchDraw(Canvas canvas) {
super.dispatchDraw(canvas);// draw list view elements (zIndex == 1)
if (mHeaderView != null && mHeaderVisibility) {
drawChild(canvas, mHeaderView, getDrawingTime()); // draw pinned header view (zIndex == 2)
}
if (mIndexBarView != null && mIndexBarVisibility) {
drawChild(canvas, mIndexBarView, getDrawingTime()); // draw index bar view (zIndex == 3)
}
if (mPreviewTextView != null && mPreviewVisibility) {
drawChild(canvas, mPreviewTextView, getDrawingTime()); // draw preview text view (zIndex == 4)
}
}
@Override
public boolean onTouchEvent(MotionEvent ev)
{
if (mIndexBarView != null && ((IndexBarView)mIndexBarView).onTouchEvent(ev))
{
setPreviewTextVisibility(true);
return true;
}
<span style="color:#ff0000;">else
{
if(ev.getAction() == MotionEvent.ACTION_UP)
{
setPreviewTextVisibility(false);//隐藏提示的textview
invalidate();
}
if(((IndexBarView)mIndexBarView).isTouchSide(ev))
return true;//如果点击的是侧边栏，就消化当前事件
return super.onTouchEvent(ev);
}</span>
}
@Override
public void filterList(float indexBarY, int position,String previewText) {
this.mIndexBarY=indexBarY;
if(mPreviewTextView instanceof TextView)
((TextView)mPreviewTextView).setText(previewText);
setSelection(position);
}
}2.IndexBarView.java
public class IndexBarView extends View
{
// index bar margin
float mIndexbarMargin;
// user touched Y axis coordinate value
float mSideIndexY;
// flag used in touch events manipulations
boolean mIsIndexing = false;
// holds current section position selected by user
int mCurrentSectionPosition = -1;
// array list to store section positions
public ArrayList<Integer> mListSections;
// array list to store listView data
ArrayList<MusicInfor> mListItems;
// paint object
Paint mIndexPaint;
// context object
Context mContext;
// interface object used as bridge between list view and index bar view for
// filtering list view content on touch event
IIndexBarFilter mIndexBarFilter;
public IndexBarView(Context context)
{
super(context);
this.mContext = context;
}
public IndexBarView(Context context, AttributeSet attrs)
{
super(context, attrs);
this.mContext = context;
}
public IndexBarView(Context context, AttributeSet attrs, int defStyle)
{
super(context, attrs, defStyle);
this.mContext = context;
}
public void setData(PinnedHeaderListView listView, ArrayList<MusicInfor> listItems,ArrayList<Integer> listSections)
{
this.mListItems = listItems;
this.mListSections = listSections;
// list view implements mIndexBarFilter interface
mIndexBarFilter = listView;
// set index bar margin from resources
mIndexbarMargin = mContext.getResources().getDimension(R.dimen.index_bar_view_margin);
// index bar item color and text size
mIndexPaint = new Paint();
mIndexPaint.setColor(mContext.getResources().getColor(R.color.text_black_off));
mIndexPaint.setAntiAlias(true);
mIndexPaint.setTextSize(mContext.getResources().getDimension(R.dimen.index_bar_view_text_size));
}
// draw view content on canvas using paint
@Override
protected void onDraw(Canvas canvas)
{
if (mListSections != null && mListSections.size() > 1)
{
float sectionHeight = (getMeasuredHeight() - 2 * mIndexbarMargin)/ mListSections.size();
float paddingTop = (sectionHeight - (mIndexPaint.descent() - mIndexPaint.ascent())) / 2;
for (int i = 0; i < mListSections.size(); i++)
{
float paddingLeft = (getMeasuredWidth() - mIndexPaint.measureText(getSectionText(mListSections.get(i)))) / 2;
canvas.drawText(getSectionText(mListSections.get(i)),
paddingLeft,
mIndexbarMargin + (sectionHeight * i) + paddingTop + mIndexPaint.descent(),
mIndexPaint);
}
}
super.onDraw(canvas);
}
public String getSectionText(int sectionPosition)
{
return mListItems.get(sectionPosition).getSortLetters();
}
private boolean contains(float x, float y)
{
// Determine if the point is in index bar region, which includes the
// right margin of the bar
return (x >= getLeft() && y >= getTop() && y <= getTop() + getMeasuredHeight());
}
<span style="color:#ff0000;">public boolean isTouchSide(MotionEvent ev)
{
return contains(ev.getX(), ev.getY());
}</span>
void filterListItem(float sideIndexY)
{
mSideIndexY = sideIndexY;
// filter list items and get touched section position with in index bar
mCurrentSectionPosition = (int) (((mSideIndexY) - getTop() - mIndexbarMargin) /
((getMeasuredHeight() - (2 * mIndexbarMargin)) / mListSections.size()));
if (mCurrentSectionPosition >= 0 && mCurrentSectionPosition < mListSections.size())
{
int position = mListSections.get(mCurrentSectionPosition);
String previewText = mListItems.get(position).getSortLetters();
mIndexBarFilter.filterList(mSideIndexY, position, previewText);
}
}
public boolean onTouchEvent(MotionEvent ev)
{
switch (ev.getAction())
{
case MotionEvent.ACTION_DOWN:
// If down event occurs inside index bar region, start indexing
if (contains(ev.getX(), ev.getY()))
{
// It demonstrates that the motion event started from index
// bar
mIsIndexing = true;
// Determine which section the point is in, and move the
// list to
// that section
filterListItem(ev.getY());
return true;
}
else
{
mCurrentSectionPosition = -1;
return false;
}
case MotionEvent.ACTION_MOVE:
if (mIsIndexing)
{
// If this event moves inside index bar
if (contains(ev.getX(), ev.getY()))
{
// Determine which section the point is in, and move the
// list to that section
filterListItem(ev.getY());
return true;
}
else
{
mCurrentSectionPosition = -1;
return false;
}
}
break;
case MotionEvent.ACTION_UP:
if (mIsIndexing)
{
mIsIndexing = false;
mCurrentSectionPosition = -1;
}
break;
}
return false;
}
}
关于开源项目侧边栏字母搜索列表ListViewFilter的bug解决办法
原文地址：http://blog.csdn.net/fireworkburn/article/details/45195251
