Android联系人字母排序 Android仿微信联系人字母排序效果

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
  xmlns:tools="http://schemas.android.com/tools" 
  android:layout_width="match_parent" 
  android:layout_height="match_parent" > 
 
  <ListView 
    android:id="@+id/listview" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:cacheColorHint="@android:color/transparent" > 
  </ListView> 
 
  <com.wxcontacts.www.view.QuickIndexBar 
    android:id="@+id/quickindexbar" 
    android:layout_width="30dp" 
    android:layout_height="match_parent" 
    android:layout_alignParentRight="true" 
     /> 
   
  <!-- 默认隐藏，当点击自定义view的时候显示 --> 
  <TextView  
    android:visibility="gone" 
    android:id="@+id/tv_hint" 
    android:gravity="center" 
    android:layout_centerInParent="true" 
    android:layout_width="60dp" 
    android:layout_height="60dp" 
    android:background="@drawable/bg_text" 
    android:text="A" 
    android:textSize="24sp"/> 
 
</RelativeLayout> 

//自定义view 
public class QuickIndexBar extends View{ 
 
  //画笔 
  private Paint paint; 
   
  String[] lettres={"↑","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","↓"}; 
 
  //自定义view的宽高 
  private int viewHight; 
  private int viewWidth; 
  //每个文本的高度；（文本高度等于view高度除以文本个数） 
  private int cellHeight; 
 
  //文本的高度 
  private float textHeight; 
 
  private int currentIndex=-1; 
 
  public OnLetterChangeListen onLetterChangeListen; 
   
  public OnLetterChangeListen getOnLetterChangeListen(){ 
    return onLetterChangeListen; 
  } 
   
   
  public void setOnLetterChangeListener(OnLetterChangeListen onLetterChangeListen){ 
    this.onLetterChangeListen=onLetterChangeListen; 
  } 
  //自定义一个字母改变的监听 
  public interface OnLetterChangeListen{ 
    void onLetterChange(String letter); 
    void onResert(); 
  } 
   
  public QuickIndexBar(Context context) { 
    this(context,null); 
  } 
  public QuickIndexBar(Context context, AttributeSet attrs) { 
    this(context, attrs,0); 
  } 
 
  public QuickIndexBar(Context context, AttributeSet attrs, int defStyle) { 
    super(context, attrs, defStyle); 
    paint=new Paint(); 
    //设置字体颜色；默认为黑色；我们这里使用黑色 
    //paint.setColor(Color.WHITE); 
    //设置字体大小 
    paint.setTextSize(20); 
    //抗锯齿 
    paint.setAntiAlias(true); 
    //获取字体宽高，因为每个字体宽度不一样，所以获得宽度必须放在循环中做 
    //首先获取字体的属性 
    FontMetrics fontMetrics = paint.getFontMetrics(); 
    //下边界 - 上边界 
    textHeight = (float) Math.ceil(fontMetrics.descent-fontMetrics.ascent); 
  } 
   
  @Override 
  protected void onDraw(Canvas canvas) { 
    super.onDraw(canvas); 
    //获取文本的宽高 
//   getTextWH(); 
    //每个文本的高度； 
    cellHeight=viewHight/lettres.length; 
     
    //通过循环把字母画出来 
    for(int x=0;x<lettres.length;x++){ 
      String text=lettres[x]; 
       
      //paint给我们提供了一个测量字体宽度的方法 
      float textWidth = paint.measureText(text); 
      if(currentIndex==x){ 
        //当点击某个字母的时候变色 
        paint.setColor(Color.GRAY); 
      }else{ 
        paint.setColor(Color.BLACK); 
      } 
       
      /* 
       * 参数1：要画的内容   参数23：要画的位置   参数4：画笔 
       * 参数23所画的位置指的是字母左下角坐标 
       */ 
      canvas.drawText(text,viewWidth/2-textWidth/2,cellHeight/2+textHeight/2+cellHeight*x,paint); 
    } 
     
  } 
   
  //测量view的宽高 
  @Override 
  protected void onSizeChanged(int w, int h, int oldw, int oldh) { 
    super.onSizeChanged(w, h, oldw, oldh); 
    viewHight =getMeasuredHeight(); 
    viewWidth =getMeasuredWidth(); 
  } 
   
  @Override 
  public boolean onTouchEvent(MotionEvent event) { 
    switch (event.getAction()) { 
     
    case MotionEvent.ACTION_DOWN: 
      //计算当前点击的字母，宽度不用考虑，因为宽度都是一样的，计算高度即可，根据你点击或者移动的高度计算你当前所点击的是哪个字母 
      float downY=event.getY(); 
      currentIndex = (int)downY/cellHeight; 
      if(currentIndex<0 || currentIndex>lettres.length-1){ 
      }else{ 
        if(onLetterChangeListen!=null){ 
          onLetterChangeListen.onLetterChange(lettres[currentIndex]); 
        } 
      } 
      //重新绘制;相当于重新调用onDraw()方法 
      invalidate(); 
      break; 
    case MotionEvent.ACTION_MOVE: 
      float moveY=event.getY(); 
      currentIndex = (int)moveY/cellHeight; 
      if(currentIndex<0 || currentIndex>lettres.length-1){ 
      }else{ 
        if(onLetterChangeListen!=null){ 
          onLetterChangeListen.onLetterChange(lettres[currentIndex]); 
        } 
      } 
      //重新绘制 
      invalidate(); 
      break; 
    case MotionEvent.ACTION_UP: 
      currentIndex=-1; 
      if(onLetterChangeListen!=null){ 
        onLetterChangeListen.onResert(); 
      } 
      break; 
 
    default: 
      break; 
    } 
    return true; 
  } 
 
} 

public class MainActivity extends Activity { 
 
  private com.wxcontacts.www.view.QuickIndexBar quickIndexBar; 
  private ListView mListView; 
  //当点击自定义view的时候屏幕中间显示一个方块，显示当前点击的字母，默认是隐藏的，当点击的时候才显示 
  private TextView tvHint; 
   
  private List<HaoHan> hhList=new ArrayList<HaoHan>(); 
  Context context; 
  @Override 
  protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    requestWindowFeature(Window.FEATURE_NO_TITLE); 
    setContentView(R.layout.activity_main); 
    tvHint=(TextView) findViewById(R.id.tv_hint); 
    context=this; 
    //listview 和 自定义view 
    mListView=(ListView) findViewById(R.id.listview); 
    quickIndexBar=(QuickIndexBar) findViewById(R.id.quickindexbar); 
     
    initHHListData(); 
     
    mListView.setAdapter(new MainListViewAdapter(context,hhList)); 
     
    //给自定义view设置自定义监听，当点击到某个字母的时候弹出吐司显示这个字母； 
    //当点击字母的时候遍历集合，找到首字母为点击字母的HaoHan的下标，让listview跳转到响应位置 
    quickIndexBar.setOnLetterChangeListener(new QuickIndexBar.OnLetterChangeListen() { 
       
      @Override 
      public void onLetterChange(String letter) { 
         
        quickIndexBar.setBackgroundResource(R.drawable.bg_text); 
         
        tvHint.setVisibility(View.VISIBLE); 
        tvHint.setText(letter); 
         
        for(int x=0;x<hhList.size();x++){ 
          if((hhList.get(x).pinyin.charAt(0)+"").equals(letter)){ 
            mListView.setSelection(x); 
            //找到第一个字母相同的直接结束，不再向下找； 
            break; 
          } 
        } 
      } 
 
      @Override 
      //当手指弹起的时候此方法执行 
      public void onResert() { 
        tvHint.setVisibility(View.GONE); 
        quickIndexBar.setBackgroundResource(Color.TRANSPARENT); 
      } 
    }); 
  } 
   
  //初始化集合数据 
  private void initHHListData() { 
     
    HaoHan hh; 
    for(int x=0;x<Cheeses.NAMES.length;x++){ 
      hh=new HaoHan(Cheeses.NAMES[x]); 
      hhList.add(hh); 
    } 
     
    //给集合排序 
    Collections.sort(hhList); 
     
  } 
 
}