高仿微信通讯录，解决SideBarView下标越界问题

来源：互联网发布：大连软件招聘会编辑：程序博客网时间：2024/05/22 07:00
自定义右侧字母检索栏view。SideBarView.java
package com.gucc.contacts;import android.content.Context;import android.content.res.TypedArray;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Typeface;import android.util.AttributeSet;import android.util.Log;import android.view.MotionEvent;import android.view.View;/** *  * @author: guc * @create_time:2017年5月8日  上午9:57:56 * @类描述： * @version: * */public class SideBarView extends View{    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 int selectPos = -1;    private final int defaultNormalColor = Color.TRANSPARENT;    private final int defaultPressColor = Color.parseColor("#1F000000");    private final int defaultTextSize = 30;    private final int defaultNorTextColor = Color.parseColor("#cc181818");    private final int defaultPressTextColor = Color.parseColor("#ff000000");    private int sideBarBgNorColor;    private int sideBarBgPressColor;    private int sideBarTextSize;    private int sideBarNorTextColor;    private int sideBarPressTextColor;    public SideBarView(Context context) {        this(context, null);    }    public SideBarView(Context context, AttributeSet attrs) {        this(context, attrs, 0);        init();    }    public SideBarView(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.SideBarView, defStyleAttr, 0);        sideBarBgNorColor = typedArray.getColor(R.styleable.SideBarView_sidebar_nor_background,defaultNormalColor);        sideBarBgPressColor = typedArray.getColor(R.styleable.SideBarView_sidebar_press_background,defaultPressColor);        sideBarTextSize = typedArray.getInt(R.styleable.SideBarView_sidebar_text_size, defaultTextSize);        sideBarNorTextColor = typedArray.getColor(R.styleable.SideBarView_sidebar_text_color_nor, defaultNorTextColor);        sideBarPressTextColor = typedArray.getColor(R.styleable.SideBarView_sidebar_text_color_press, defaultPressTextColor);        typedArray.recycle();        init();    }    Paint paint;    Paint paintSelect;    private void init() {        paint= new Paint() ;        paint.setAntiAlias(true);        paint.setColor(sideBarNorTextColor);        paint.setTypeface(Typeface.DEFAULT_BOLD);        paint.setTextSize(sideBarTextSize);        paintSelect= new Paint() ;        paintSelect.setAntiAlias(true);        paintSelect.setTypeface(Typeface.DEFAULT_BOLD);        paintSelect.setTextSize(sideBarTextSize);        paintSelect.setColor(sideBarPressTextColor);    }    int height;    int width;    int perHeight;    @Override    public boolean onTouchEvent(MotionEvent event) {        float x = event.getY();        int position = (int) (x / perHeight);        //防止滑动或点击两端时出现下标越界        if (position >= b.length) {            position = b.length -1;        }else if (position<= -1) {            position = 0;        }        switch (event.getAction()){            case MotionEvent.ACTION_DOWN:                setBackgroundColor(sideBarBgPressColor);                selectPos = position;                if(listener != null)                    listener.onLetterSelected(b[selectPos]);                invalidate();                break;            case MotionEvent.ACTION_MOVE:                if(position != selectPos){                    //切换到其他字母                    selectPos = position;                    if(listener != null){                    //防止滑动到两端时出现下标越界                         if (selectPos >= b.length) {                             selectPos = b.length -1;                        }else if (selectPos<= -1) {                            selectPos = 0;                        }                            listener.onLetterChanged(b[selectPos]);                    }                    invalidate();                }                break;            case MotionEvent.ACTION_UP:            case MotionEvent.ACTION_CANCEL:                setBackgroundColor(sideBarBgNorColor);                if(listener != null){                    listener.onLetterReleased(b[selectPos]);                }                break;        }        return true;    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        height = getHeight();        width = getWidth();        perHeight = height / b.length;        for (int i = 0; i < b.length; i++) {            canvas.drawText(b[i],width/2 - paint.measureText(b[i])/2,perHeight * i+perHeight,paint);            if(selectPos == i){                canvas.drawText(b[i],width/2 - paint.measureText(b[i])/2,perHeight * i+perHeight,paintSelect);            }        }    }    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        int width = resolveMeasure(widthMeasureSpec, true);        int height = resolveMeasure(heightMeasureSpec,false);        setMeasuredDimension(width,height);    }    private int resolveMeasure(int measureSpec ,boolean isWidth) {        int result = 0 ;        int padding = isWidth ? getPaddingLeft() + getPaddingRight() : getPaddingTop() + getPaddingBottom();        // 获取宽度测量规格中的mode        int mode = MeasureSpec.getMode(measureSpec);        // 获取宽度测量规格中的size        int size = MeasureSpec.getSize(measureSpec);        switch (mode){            case MeasureSpec.EXACTLY:                result = size;                break;            case MeasureSpec.AT_MOST:                case MeasureSpec.UNSPECIFIED:                    float textWidth = paint.measureText(b[0]);                    if(isWidth){                        result = getSuggestedMinimumWidth() > textWidth ? getSuggestedMinimumWidth() : (int) textWidth;                        result += padding;                        result = Math.min(result,size);                    }else{                        result = size;                        result = Math.max(result,size);                    }                break;        }        return result;    }    public float dp2px(float dp) {        final float scale = getResources().getDisplayMetrics().density;        return dp * scale + 0.5f;    }    @Override    protected int getSuggestedMinimumWidth() {        return (int) dp2px(25);    }    public interface LetterSelectListener{        void onLetterSelected(String letter);        void onLetterChanged(String letter);        void onLetterReleased(String letter);    }    private LetterSelectListener listener;    public void setOnLetterSelectListen(LetterSelectListener listen){        this.listener = listen;    }}
完整源码请点击：Contacts
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