How to use

IndexBar

in

com.mcxtzhang.indexlib.IndexBar.widget

@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
  super.onSizeChanged(w, h, oldw, oldh);
  mWidth = w;
  mHeight = h;
  //add by zhangxutong 2016 09 08 :解决源数据为空 或者size为0的情况,
  if (null == mIndexDatas || mIndexDatas.isEmpty()) {
    return;
  }
  computeGapHeight();
}

/**
 * 以下情况调用：
 * 1 在数据源改变
 * 2 控件size改变时
 * 计算gapHeight
 */
private void computeGapHeight() {
  mGapHeight = (mHeight - getPaddingTop() - getPaddingBottom()) / mIndexDatas.size();
}

public IndexBar(Context context, AttributeSet attrs, int defStyleAttr) {
  super(context, attrs, defStyleAttr);
  init(context, attrs, defStyleAttr);
}

  @Override
  public void onClick(View v) {
    ((SwipeMenuLayout) holder.itemView).quickClose();
    mDatas.remove(holder.getAdapterPosition());
    mIndexBar.setmPressedShowTextView(mTvSideBarHint)//设置HintTextView
        .setNeedRealIndex(true)//设置需要真实的索引
        .setmLayoutManager(mManager)//设置RecyclerView的LayoutManager
        .setmSourceDatas(mDatas)//设置数据
        .invalidate();
    notifyDataSetChanged();
  }
});

  /**
   * 更新数据源
   *
   * @param view
   */
  public void updateDatas(View view) {
    for (int i = 0; i < 5; i++) {
      mDatas.add(new CityBean("东京"));
      mDatas.add(new CityBean("大阪"));
    }
    mIndexBar.setmSourceDatas(mDatas)
        .invalidate();
    mHeaderAdapter.notifyDataSetChanged();
  }
}

switch (event.getAction()) {
  case MotionEvent.ACTION_DOWN:
    setBackgroundColor(mPressedBackground);//手指按下时背景变色
    int pressI = (int) ((y - getPaddingTop()) / mGapHeight);
  case MotionEvent.ACTION_CANCEL:
  default:
    setBackgroundResource(android.R.color.transparent);//手指抬起时背景恢复透明

  @Override
  public void run() {
    mDatas = new ArrayList<>();
    for (int i = 0; i < data.length; i++) {
      CityBean cityBean = new CityBean();
      cityBean.setCity(data[i]);//设置城市名称
      mDatas.add(cityBean);
    }
    mIndexBar.setmSourceDatas(mDatas)//设置数据
        .setHeaderViewCount(mHeaderAdapter.getHeaderViewCount())//设置HeaderView数量
        .invalidate();
    mAdapter.setDatas(mDatas);
    mHeaderAdapter.notifyDataSetChanged();
    mDecoration.setmDatas(mDatas);
  }
}, 200);

  @Override
  public void run() {
    mBodyDatas = new ArrayList<>();
    for (int i = 0; i < data.length; i++) {
      MeiTuanBean cityBean = new MeiTuanBean();
      cityBean.setCity(data[i]);//设置城市名称
      mBodyDatas.add(cityBean);
    }
    //先排序
    mIndexBar.getDataHelper().sortSourceDatas(mBodyDatas);
    mAdapter.setDatas(mBodyDatas);
    mHeaderAdapter.notifyDataSetChanged();
    mSourceDatas.addAll(mBodyDatas);
    mIndexBar.setmSourceDatas(mSourceDatas)//设置数据
        .invalidate();
    mDecoration.setmDatas(mSourceDatas);
  }
}, 1000);

private void init(Context context, AttributeSet attrs, int defStyleAttr) {
  int textSize = (int) TypedValue.applyDimension(
      TypedValue.COMPLEX_UNIT_SP, 16, getResources().getDisplayMetrics());//默认的TextSize
  initIndexDatas();
  setmOnIndexPressedListener(new onIndexPressedListener() {
    @Override
    public void onIndexPressed(int index, String text) {

  /**
   * 更新数据源
   *
   * @param view
   */
  public void updateDatas(View view) {
    for (int i = 0; i < 5; i++) {
      mBodyDatas.add(new MeiTuanBean("东京"));
      mBodyDatas.add(new MeiTuanBean("大阪"));
    }
    //先排序
    mIndexBar.getDataHelper().sortSourceDatas(mBodyDatas);
    mSourceDatas.clear();
    mSourceDatas.addAll(mHeaderDatas);
    mSourceDatas.addAll(mBodyDatas);

    mHeaderAdapter.notifyDataSetChanged();
    mIndexBar.invalidate();
  }
}

public IndexBar setmSourceDatas(List<? extends BaseIndexPinyinBean> mSourceDatas) {
  this.mSourceDatas = mSourceDatas;
  initSourceDatas();//对数据源进行初始化
  return this;
}

/**
 * 一定要在设置数据源{@link #setmSourceDatas(List)}之前调用
 *
 * @param needRealIndex
 * @return
 */
public IndexBar setNeedRealIndex(boolean needRealIndex) {
  isNeedRealIndex = needRealIndex;
  initIndexDatas();
  return this;
}

@Override
protected void onDraw(Canvas canvas) {
  int t = getPaddingTop();//top的基准点(支持padding)
  String index;//每个要绘制的index内容
  for (int i = 0; i < mIndexDatas.size(); i++) {
    index = mIndexDatas.get(i);
    Paint.FontMetrics fontMetrics = mPaint.getFontMetrics();//获得画笔的FontMetrics，用来计算baseLine。因为drawText的y坐标，代表的是绘制的文字的baseLine的位置
    int baseline = (int) ((mGapHeight - fontMetrics.bottom - fontMetrics.top) / 2);//计算出在每格index区域，竖直居中的baseLine值
    canvas.drawText(index, mWidth / 2 - mPaint.measureText(index) / 2, t + mGapHeight * i + baseline, mPaint);//调用drawText，居中显示绘制index
  }
}

/**
 * 根据传入的pos返回tag
 *
 * @param tag
 * @return
 */
private int getPosByTag(String tag) {
  //add by zhangxutong 2016 09 08 :解决源数据为空 或者size为0的情况,
  if (null == mSourceDatas || mSourceDatas.isEmpty()) {
    return -1;
  }
  if (TextUtils.isEmpty(tag)) {
    return -1;
  }
  for (int i = 0; i < mSourceDatas.size(); i++) {
    if (tag.equals(mSourceDatas.get(i).getBaseIndexTag())) {
      return i + getHeaderViewCount();
    }
  }
  return -1;
}

  @Override
  public void run() {
    mDatas = new ArrayList<>();
    //微信的头部 也是可以右侧IndexBar导航索引的，
    // 但是它不需要被ItemDecoration设一个标题titile
    mDatas.add((CityBean) new CityBean("新的朋友").setTop(true).setBaseIndexTag(INDEX_STRING_TOP));
    mDatas.add((CityBean) new CityBean("群聊").setTop(true).setBaseIndexTag(INDEX_STRING_TOP));
    mDatas.add((CityBean) new CityBean("标签").setTop(true).setBaseIndexTag(INDEX_STRING_TOP));
    mDatas.add((CityBean) new CityBean("公众号").setTop(true).setBaseIndexTag(INDEX_STRING_TOP));
    for (int i = 0; i < data.length; i++) {
      CityBean cityBean = new CityBean();
      cityBean.setCity(data[i]);//设置城市名称
      mDatas.add(cityBean);
    }
    mAdapter.setDatas(mDatas);
    mAdapter.notifyDataSetChanged();
    mIndexBar.setmPressedShowTextView(mTvSideBarHint)//设置HintTextView
        .setNeedRealIndex(true)//设置需要真实的索引
        .setmLayoutManager(mManager)//设置RecyclerView的LayoutManager
        .setmSourceDatas(mDatas)//设置数据
        .invalidate();
    mDecoration.setmDatas(mDatas);
  }
}, 2000);

/**
 * 更新数据源
 *
 * @param view
 */
public void updateDatas(View view) {
  for (int i = 0; i < 5; i++) {
    mDatas.add(new CityBean("东京"));
    mDatas.add(new CityBean("大阪"));
  }
  mIndexBar.setmSourceDatas(mDatas)
      .invalidate();
  mAdapter.notifyDataSetChanged();
}

  /**
   * 更新数据源
   *
   * @param view
   */
  public void updateDatas(View view) {
    for (int i = 0; i < 5; i++) {
      mDatas.add(new CityBean("东京"));
      mDatas.add(new CityBean("大阪"));
    }

    mIndexBar.setmSourceDatas(mDatas)
        .invalidate();
    mAdapter.notifyDataSetChanged();
  }
}

/**
 * 初始化原始数据源，并取出索引数据源
 *
 * @return
 */
private void initSourceDatas() {
  //add by zhangxutong 2016 09 08 :解决源数据为空 或者size为0的情况,
  if (null == mSourceDatas || mSourceDatas.isEmpty()) {
    return;
  }
  if (!isSourceDatasAlreadySorted) {
    //排序sourceDatas
    mDataHelper.sortSourceDatas(mSourceDatas);
  } else {
    //汉语->拼音
    mDataHelper.convert(mSourceDatas);
    //拼音->tag
    mDataHelper.fillInexTag(mSourceDatas);
  }
  if (isNeedRealIndex) {
    mDataHelper.getSortedIndexDatas(mSourceDatas, mIndexDatas);
    computeGapHeight();
  }
  //sortData();
}

  @Override
  public void run() {
    mDatas = new ArrayList<>();
    //微信的头部 也是可以右侧IndexBar导航索引的，
    // 但是它不需要被ItemDecoration设一个标题titile
    mDatas.add((CityBean) new CityBean("新的朋友").setTop(true).setBaseIndexTag(INDEX_STRING_TOP));
    mDatas.add((CityBean) new CityBean("群聊").setTop(true).setBaseIndexTag(INDEX_STRING_TOP));
    mDatas.add((CityBean) new CityBean("标签").setTop(true).setBaseIndexTag(INDEX_STRING_TOP));
    mDatas.add((CityBean) new CityBean("公众号").setTop(true).setBaseIndexTag(INDEX_STRING_TOP));
    for (int i = 0; i < data.length; i++) {
      CityBean cityBean = new CityBean();
      cityBean.setCity(data[i]);//设置城市名称
      mDatas.add(cityBean);
    }
    mAdapter.setDatas(mDatas);
    mAdapter.notifyDataSetChanged();
    mIndexBar.setmSourceDatas(mDatas)//设置数据
        .invalidate();
    mDecoration.setmDatas(mDatas);
  }
}, 500);