联系人列表查找控件

此类查找控件有很多帖子，很久没有写过这个控件了  ^_^，闲着练练手。

下面贴出源码：

 

package com.lt.vs.come.custom;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
//import android.graphics.Rect;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
//import android.view.ViewGroup;
import android.widget.TextView;

/**
 * Created by 金色VS时空 on 2018/2/20.
 */

public class ContactBannerView extends View {

    public ContactBannerView(Context context) {
        super(context);

    }

    public ContactBannerView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public ContactBannerView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    private Paint mPaint;
    /**
     * 字母列表资源
     */
    private String []letters={"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 char[] chars={'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 OnLetterSelectedListener mOnLetterSelectedListener;

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        initPaint();

        //画初始默认背景色
        if (isTouch){
            //画按下时背景色
            mPaint.setColor(Color.parseColor(pressedColor));
        }else{
            //画默认背景色
            mPaint.setColor(Color.parseColor(defaultColor));
        }
        mPaint.setStyle(Paint.Style.FILL);
        canvas.drawRect(0,0,getWidth(),getHeight(),mPaint);


        //绘制字母列表
        mPaint.setColor(Color.BLACK);
        mPaint.setTextSize(35);
        int length=letters.length;
        float padding=getHeight()/length;
        float startX=getWidth()/2;
        float startY=padding-10;
        Log.e("==========",""+startY);
        for (int i = 0; i 

控件还可以拓展接口。喜欢的点个赞吧

 

这是更新的简洁版本代码如下，很简单不多解释了：

package com.example.myapplication.coustom;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Point;
import android.graphics.Rect;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import java.util.ArrayList;
import java.util.List;

/**
 * email:[email protected]
 * Created by gold on 2019/9/25
 * Describe:
 **/
public class ABarView extends View {

    public ABarView(Context context) {
        this(context,null);
    }

    public ABarView(Context context, @Nullable AttributeSet attrs) {
        this(context, attrs,0);
    }

    public ABarView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        initPaint();
    }

    private Paint paint;
    private int w = 100;
    private int h;
    private List abc;
    private int startX,startY;
    private int perLine;
    private int padding=100;//上下安全距离
    private void initPaint() {
        paint=new Paint();
        paint.setTextSize(12f);
        paint.setAntiAlias(true);
        //设置绘制整体区域
        abc=new ArrayList<>();
        for (int i = 0; i < 26; i++) {
            abc.add(String.valueOf((char)('A' + i)));
        }
        Log.e("@@@@==",abc.toString());
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        w = MeasureSpec.getSize(widthMeasureSpec);      //取出宽度的确切数值
        h = MeasureSpec.getSize(heightMeasureSpec);    //取出高度的确切数值
        perLine = (h-padding*2)/abc.size();
        setMeasuredDimension(w,h);
    }

    private boolean isPressed;
    private List points=new ArrayList<>();
    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        canvas.save();
        //绘制常态背景
        paint.setShadowLayer(20 , 0, 0, Color.parseColor("#436EEE"));
        if (!isPressed){
            paint.setColor(Color.parseColor("#F8F8FF"));
        }else{
            paint.setColor(Color.parseColor("#DEDEDE"));
        }
        paint.setStyle(Paint.Style.FILL);
        canvas.drawRect(new Rect(0,0,w,h),paint);

        //绘制字母
        for (int i = 0; i < abc.size(); i++) {
            if (getIndex()==i){
                paint.setColor(Color.parseColor("#000000"));
                paint.setTextSize(sp2px(getContext(),16));
                paint.setStyle(Paint.Style.FILL);
            }else{
                paint.setColor(Color.parseColor("#4682B4"));
                paint.setTextSize(sp2px(getContext(),12));
                paint.setStyle(Paint.Style.STROKE);
            }
            //x表示下限值  y表示上限值
            Point point = new Point();
            String per = abc.get(i);
            Paint.FontMetricsInt metrics=paint.getFontMetricsInt();
            int per_height = metrics.descent-metrics.ascent;
            Rect rect = new Rect();
            paint.getTextBounds(per,0,per.length(),rect);
            int per_width = rect.width();
            paint.setStyle(Paint.Style.FILL);

            startX = w/2-per_width/2;
            startY = (padding+per_height) +perLine*i;
            point.x=startY-perLine/2;
            point.y=startY+perLine/2;
            points.add(point);
            canvas.drawText(per,startX,startY,paint);
        }
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        int action =event.getAction();
        switch (action){
            case MotionEvent.ACTION_DOWN:
                isPressed=true;
                Log.e("@@@@==","ACTION_DOWN="+event.getY());
                choosed_ACTION_DOWN(event.getY());
                break;
            case MotionEvent.ACTION_MOVE:
                Log.e("@@@@==","ACTION_MOVE="+event.getY());
                choosed_ACTION_DOWN(event.getY());
                break;
            case MotionEvent.ACTION_UP:
                Log.e("@@@@==","ACTION_UP="+event.getY());
                isPressed=false;
                invalidate();
                break;
        }

        return true;

    }

    private void choosed_ACTION_DOWN(float rawY) {
        for (int i = 0; i < points.size(); i++) {
            if (rawY<=points.get(i).y && i==0){//选中第一个
                setIndex(0);
                return;
            }

            if (rawY>=points.get(i).x && i==points.size()-1){//选中最后一个
                setIndex(abc.size()-1);
                return;
            }

            if (rawY>points.get(i).x && rawY