ListView分组和字母导航，自定义Toast

 

效果还是不错的噢，滚动的时候有分组的挤压效果，右侧字母表导航，Toast提示。这不是ExpendableListView噢，用ListView+AlphabetIndexer辅助类实现

LetterView的代码

 

public class LetterView extends View{/**触摸到view的时候的背景颜色**/public static final int COLOR_BG = 0xaa876881;/**没触摸view的时候的背景颜色**/public static final int COLOR_NO_BG = 0x00000000;/**选中的字母的字体颜色**/public static final int COLOR_TEXT_SELECTED = 0xff386AB7;/**没选中的字母的字体颜色**/public static final int COLOR_TEXT_NORMAL = 0xff000000;/**字母的字体大小**/public static final int SIZE_TEXT = 22;/**字母表**/private static final String letters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";private Paint paint;/**该View的宽**/private int width;/**该View的高**/private int height;/**单个字母的高**/private int singleHight;public LetterView(Context context, AttributeSet attrs) {super(context, attrs);init();}private void init() {paint = new Paint();paint.setAntiAlias(true); //抗锯齿paint.setTextSize(SIZE_TEXT); //设置字体大小paint.setFakeBoldText(true); //设置文字为粗体}@Overrideprotected void onDraw(Canvas canvas) {super.onDraw(canvas);if(width == 0 || height == 0){width = getWidth();height = getHeight();singleHight = height/letters.length();}for (int i = 0; i < letters.length(); i++) {if(currentSelectedIndex == i){paint.setColor(COLOR_TEXT_SELECTED);}else{paint.setColor(COLOR_TEXT_NORMAL);}//paint.measureText(str)  测量str的宽float xPos = (width-paint.measureText(letters.charAt(i)+""))/2;float yPos = singleHight*i+singleHight;canvas.drawText(letters.charAt(i)+"", xPos, yPos, paint);}}private int currentSelectedIndex = 0;@Overridepublic boolean onTouchEvent(MotionEvent event) {currentSelectedIndex = (int) (event.getY()/singleHight);if(currentSelectedIndex < 0 ){currentSelectedIndex = 0;}if(currentSelectedIndex > letters.length() - 1){currentSelectedIndex = letters.length() - 1;}if(letterChangeListener != null){//回调letterChangeListener.onLetterChange(currentSelectedIndex);}invalidate();switch (event.getAction()) {case MotionEvent.ACTION_DOWN:setBackgroundColor(COLOR_BG);break;case MotionEvent.ACTION_MOVE:break;case MotionEvent.ACTION_UP:setBackgroundColor(COLOR_NO_BG);break;}return true;}private OnLetterChangeListener letterChangeListener;public void setOnLetterChangeListener(OnLetterChangeListener letterChangeListener){this.letterChangeListener = letterChangeListener;}public interface OnLetterChangeListener{void onLetterChange(int selectedIndex);}public void setSelectedIndex(int selectedIndex) {currentSelectedIndex = selectedIndex;invalidate();}

}

 

源码：http://download.csdn.net/detail/by317966834/7698455