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
	}

	@Override
	protected 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;
	@Override
	public 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