Android实现仿通讯录侧边栏滑动SiderBar效果代码

本文实例讲述了Android实现仿通讯录侧边栏滑动SiderBar效果代码。分享给大家供大家参考，具体如下：

之前看到某些应用的侧边栏做得不错，想想自己也弄一个出来，现在分享出来，当然里面还有不足的地方，请大家多多包涵。

先上图：

具体实现的代码如下：

package com.freesonfish.listview_index;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
public class MySideBar extends View {
 private OnTouchingLetterChangedListener touchListener;
 // 26个字母
 public static 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" };
 private boolean showBkg = false;
 int choose = -1;
 int scrollChoose = -1;
 Paint paint = new Paint();
 Paint rectPaint = new Paint();
 float rectWidth = 0f;
 public MySideBar(Context context, AttributeSet attrs, int defStyle) {
   super(context, attrs, defStyle);
   init();
 }
 public MySideBar(Context context, AttributeSet attrs) {
   super(context, attrs);
   init();
 }
 public MySideBar(Context context) {
   super(context);
   init();
 }
 private void init() {
   rectPaint.setColor(Color.parseColor("#CCCCCC"));
   rectWidth = paint.measureText("#");
 }
 /**
  * 重写这个方法
  */
 protected void onDraw(Canvas canvas) {
   super.onDraw(canvas);
   if (showBkg) {
     canvas.drawColor(Color.parseColor("#CCCCCC"));
   }
   final int height = getHeight();
   final int width = getWidth();
   final int singleHeight = height / b.length;
   final float xRectPos = ((float) width - paint.measureText("#")) / 2.0f - rectWidth;
   final float xRectPos2 = xRectPos + 3.0f * rectWidth;
   for (int i = 0; i < b.length; i++) {
     paint.setFakeBoldText(true);
     paint.setAntiAlias(true);
     final float xPos = ((float) width - paint.measureText(b[i])) / 2.0f;
     final float yPos = singleHeight * i + singleHeight;
     if (i == choose) {
       paint.setColor(Color.RED);
       canvas.drawRect(xRectPos, yPos - singleHeight / 2.0f, xRectPos2, yPos + rectWidth, rectPaint);
     }
     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 c = (int) (y / getHeight() * b.length);
   switch (action) {
   case MotionEvent.ACTION_DOWN:
     showBkg = true;
     if (choose != c && touchListener != null) {
       doOnActionDown(c);
     }
     break;
   case MotionEvent.ACTION_MOVE:
     if (choose != c && touchListener != null) {
       doOnActionDown(c);
     }
     break;
   case MotionEvent.ACTION_UP:
     showBkg = false;
     invalidate();
     break;
   }
   return true;
 }
 /**
  * listview滚动时候调用它
  *
  * @param c
  */
 public void setColorWhenListViewScrolling(int c) {
   if (scrollChoose != c) {
     scrollChoose = c;
     String string = ListContantsUtil.AbcList.get(c);
     for (int i = c; i < b.length; ++i) {
       if (string.equals(b[i])) {
         choose = i;
         invalidate();
         break;
       }
     }
   }
 }
 /**
  * 当侧边栏被按下的动作
  * @param c
  */
 private void doOnActionDown(int c) {
   if (c > 0 && c < b.length) {
     if (ListContantsUtil.indexPositionMap.containsKey(b[c])) {
       touchListener.onTouchingLetterChanged(b[c]);
       choose = c;
       invalidate();
     } else {
       c = c - 1;
       doOnActionDown(c);
     }
   }
 }
 @Override
 public boolean onTouchEvent(MotionEvent event) {
   return super.onTouchEvent(event);
 }
 public void setOnTouchingLetterChangedListener(OnTouchingLetterChangedListener touchListener) {
   this.touchListener = touchListener;
 }
 /**
  * 用来通知activity显示选中的字母
  * @author freeson
  *
  */
 public interface OnTouchingLetterChangedListener {
   public void onTouchingLetterChanged(String s);
 }
}

然后ListContantsUtil类是存储通讯录名字的拼音等的类，具体也如下：

package com.freesonfish.listview_index;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
public class ListContantsUtil {
 static final List<Integer> indexPositionList = new ArrayList<Integer>();
 static final List<String> AbcList = new ArrayList<String>();
 static final HashMap<String, Integer> indexPositionMap = new HashMap<String, Integer>();
 static void putNameIndexToMap(List<String> list, HashMap<String, String> nameAndPinyin) {
   int lenght = list.size();
   for (int i = 0; i < lenght; ++i) {
     String name = nameAndPinyin.get(list.get(i)).substring(0, 1);
     // 判断该字符是属于字母还是数字或其他的
     int ascii = name.toCharArray()[0];
     if (ascii >= 65 && ascii <= 90) {
       if (!indexPositionMap.containsKey(name)) {
         indexPositionMap.put(name, i);
         AbcList.add(name);
         indexPositionList.add(i);
       }
     } else {
       if (!indexPositionMap.containsKey("#")) {
         indexPositionMap.put("#", i);
         AbcList.add("#");
         indexPositionList.add(i);
       }
     }
   }
 }
}

注意，上面的程序还是有些小问题的，请大家注意优化解决。

完整实例代码代码点击此处本站下载。

希望本文所述对大家Android程序设计有所帮助。