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。
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