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。