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Android開(kāi)發(fā)之自定義view實(shí)現(xiàn)通訊錄列表A~Z字母提示效果【附demo源碼下載】

更新時(shí)間：2017年07月20日 12:17:03 作者：luck_apple

這篇文章主要介紹了Android開(kāi)發(fā)之自定義view實(shí)現(xiàn)通訊錄列表A~Z字母提示效果,結(jié)合完整實(shí)例形式分析了Android獲取通訊錄列表及采用自定義view排列顯示的相關(guān)操作技巧,需要的朋友可以參考下

本文實(shí)例講述了Android開(kāi)發(fā)之自定義view實(shí)現(xiàn)通訊錄列表A~Z字母提示效果。分享給大家供大家參考，具體如下：

開(kāi)發(fā)工具：eclipse

運(yùn)行環(huán)境：htc G9 android2.3.3

話不多說(shuō)，先看效果圖

其實(shí)左右邊的A~Z是一個(gè)自定義的View，它直接覆蓋在ListView上。

MyLetterListView：

public class MyLetterListView extends View {
  OnTouchingLetterChangedListener onTouchingLetterChangedListener;
  String[] b = {"#","A","B","C","D","E","F","G","H","I","J","K","L"
      ,"M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z"};
  int choose = -1;
  Paint paint = new Paint();
  boolean showBkg = false;
  public MyLetterListView(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
  }
  public MyLetterListView(Context context, AttributeSet attrs) {
    super(context, attrs);
  }
  public MyLetterListView(Context context) {
    super(context);
  }
  @Override
  protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    if(showBkg){
      canvas.drawColor(Color.parseColor("#40000000"));
    }
    int height = getHeight();
    int width = getWidth();
    int singleHeight = height / b.length;
    for(int i=0;i<b.length;i++){
      paint.setColor(Color.WHITE);
      paint.setTypeface(Typeface.DEFAULT_BOLD);
      paint.setAntiAlias(true);
      if(i == choose){
        paint.setColor(Color.parseColor("#3399ff"));
        paint.setFakeBoldText(true);
      }
      float xPos = width/2 - paint.measureText(b[i])/2;
      float yPos = singleHeight * i + singleHeight;
      canvas.drawText(b[i], xPos, yPos, paint);
      paint.reset();
    }
  }
  @Override
  public boolean dispatchTouchEvent(MotionEvent event) {
    final int action = event.getAction();
    final float y = event.getY();
    final int oldChoose = choose;
    final OnTouchingLetterChangedListener listener = onTouchingLetterChangedListener;
    final int c = (int) (y/getHeight()*b.length);
    switch (action) {
      case MotionEvent.ACTION_DOWN:
        showBkg = true;
        if(oldChoose != c && listener != null){
          if(c > 0 && c< b.length){
            listener.onTouchingLetterChanged(b[c]);
            choose = c;
            invalidate();
          }
        }
        break;
      case MotionEvent.ACTION_MOVE:
        if(oldChoose != c && listener != null){
          if(c > 0 && c< b.length){
            listener.onTouchingLetterChanged(b[c]);
            choose = c;
            invalidate();
          }
        }
        break;
      case MotionEvent.ACTION_UP:
        showBkg = false;
        choose = -1;
        invalidate();
        break;
    }
    return true;
  }
  @Override
  public boolean onTouchEvent(MotionEvent event) {
    return super.onTouchEvent(event);
  }
  public void setOnTouchingLetterChangedListener(
      OnTouchingLetterChangedListener onTouchingLetterChangedListener) {
    this.onTouchingLetterChangedListener = onTouchingLetterChangedListener;
  }
  public interface OnTouchingLetterChangedListener{
    public void onTouchingLetterChanged(String s);
  }
}

然后我在Activity中OnTouchingLetterChangedListener中監(jiān)聽(tīng)手指觸摸到了哪個(gè)字母，然后讓列表跳轉(zhuǎn)到對(duì)應(yīng)的位置，

彈出首字母提示框：

private class LetterListViewListener implements OnTouchingLetterChangedListener{
    @Override
    public void onTouchingLetterChanged(final String s) {
      if(alphaIndexer.get(s) != null) {
        int position = alphaIndexer.get(s);
        personList.setSelection(position);
        overlay.setText(sections[position]);
        overlay.setVisibility(View.VISIBLE);
        handler.removeCallbacks(overlayThread);
        //延遲一點(diǎn)五秒后執(zhí)行，讓overlay為不可見(jiàn)
        handler.postDelayed(overlayThread, 1500);
      }
    }
}

延遲一秒讓彈出的首字母提示框變?yōu)椴豢梢?jiàn)，也就是那個(gè)首字母提示框只會(huì)顯示一秒鐘的時(shí)間：

//設(shè)置overlay不可見(jiàn)
private class OverlayThread implements Runnable {
    @Override
    public void run() {
      overlay.setVisibility(View.GONE);
    }
}

還有關(guān)于解析漢子的首字母拼音的問(wèn)題，我這里是查的系統(tǒng)數(shù)據(jù)庫(kù)，里面正好有sort_key這一列，比如名字是張三，那么他對(duì)應(yīng)的sort_key就是：ZHANG張SAN三，這樣一來(lái)就容易多了：

//獲得漢語(yǔ)拼音首字母
private String getAlpha(String str) {
    if (str == null) {
      return "#";
    }
    if (str.trim().length() == 0) {
      return "#";
    }
    char c = str.trim().substring(0, 1).charAt(0);
    // 正則表達(dá)式，判斷首字母是否是英文字母
    Pattern pattern = Pattern.compile("^[A-Za-z]+{1}quot;);
    if (pattern.matcher(c + "").matches()) {
      return (c + "").toUpperCase();
    } else {
      return "#";
    }
}

如果你的數(shù)據(jù)不是從聯(lián)系人表中查的，那可以使用第三方j(luò)ar包，就是pinyin4j-2.5.0。

activity代碼和布局文件比較長(zhǎng)，我就不在這里貼了。

附：demo源碼點(diǎn)擊此處本站下載。

更多關(guān)于Android相關(guān)內(nèi)容感興趣的讀者可查看本站專題：《Android開(kāi)發(fā)入門與進(jìn)階教程》、《Android布局layout技巧總結(jié)》、《Android視圖View技巧總結(jié)》、《Android編程之a(chǎn)ctivity操作技巧總結(jié)》、《Android操作json格式數(shù)據(jù)技巧總結(jié)》、《Android資源操作技巧匯總》及《Android控件用法總結(jié)》

希望本文所述對(duì)大家Android程序設(shè)計(jì)有所幫助。

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