package com.loaderman.beautyseekbarviewdemo;

import android.os.Bundle;

import android.support.v7.app.AppCompatActivity;

import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    private BeautySeekBarView beautySeekBarView;

    private TextView mTextView;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        initView();

        beautySeekBarView.setPointLocation(2) ;

    }

    private void initView() {

        mTextView = (TextView) findViewById(R.id.tv);

        beautySeekBarView = (BeautySeekBarView) findViewById(R.id.myView);

        beautySeekBarView.setIndexListener(new BeautySeekBarView.indexListener() {

            @Override

            public void getIndex(int index) {

                mTextView.setText("index="+index);

            }

        });

    }

}

package com.loaderman.beautyseekbarviewdemo;

import android.animation.ValueAnimator;

import android.content.Context;

import android.content.res.TypedArray;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Paint;

import android.graphics.Paint.FontMetricsInt;

import android.util.AttributeSet;

import android.util.Log;

import android.util.TypedValue;

import android.view.MotionEvent;

import android.view.View;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.concurrent.Semaphore;

public class BeautySeekBarView extends View {

    private Semaphore sePoolTH=new Semaphore(0);//信号量，解决并发问题

    private int valueCountent;//等级点的数量

    private int pointColor;

    private int lineColor;

    private Bitmap mBitmap;

    private int bitmapWidth;

    private int bitmapHeight;

    private float bitmapPointX;

    private ArrayList<Float> pointList;//储存画出的点的point值

    private HashMap<Float, Float> mHashMap;////把差值和listX当做键值对保存起来，便于后期找出

    private int index=1;//索引

    private float mListX;//移动后最小的点

    private int smallPic;

    private int bigPic;

    private int viewPadding;

    private Paint pointPaint;

    private Paint linePaint;

    private Paint textPaint;

    private FontMetricsInt fontMetrics;

    public BeautySeekBarView(Context context) {

        this(context,null);

    }

    public BeautySeekBarView(Context context, AttributeSet attrs) {

        this(context, attrs,0);

    }

    public BeautySeekBarView(Context context, AttributeSet attrs, int defStyleAttr) {

        super(context, attrs, defStyleAttr);

        /**

         * 获得我们所定义的自定义样式属性

         */

        TypedArray a = context.getTheme().obtainStyledAttributes(attrs, R.styleable.BeautySeekBarView, defStyleAttr, 0);

        //等级数量即点的个数

        valueCountent=a.getInteger(R.styleable.BeautySeekBarView_valueCountent, 5);

        //点的颜色

        pointColor = a.getColor(R.styleable.BeautySeekBarView_pointColor, Color.WHITE);

        //线的颜色

        lineColor = a.getColor(R.styleable.BeautySeekBarView_lineColor, Color.WHITE);

        //小图片

        smallPic=a.getResourceId(R.styleable.BeautySeekBarView_smallPic, R.drawable.ic_launcher);

        //滑动过程中的大图片

        bigPic=a.getResourceId(R.styleable.BeautySeekBarView_bigPic, R.drawable.ic_launcher);

        //控件的内边距

        viewPadding=a.getDimensionPixelSize(R.styleable.BeautySeekBarView_padding, (int) TypedValue.applyDimension(

                TypedValue.COMPLEX_UNIT_SP, 16, getResources().getDisplayMetrics()));

        a.recycle();

        initData();//初始化数据

        initPaint();//初始化画笔

    }

    public void initData() {

        //      valueCountent=7;

        //      pointColor=Color.WHITE;

        //      lineColor=Color.WHITE;

        //      setBackgroundColor(Color.BLACK);

        setPadding(viewPadding, viewPadding, viewPadding, viewPadding);

        bitmapPointX=getPaddingLeft();

        mBitmap=BitmapFactory.decodeResource(getResources(), smallPic);

        bitmapWidth=mBitmap.getWidth();

        bitmapHeight=mBitmap.getHeight();

        pointList=new ArrayList<Float>();

        mHashMap=new HashMap<Float, Float>();

    }

    public void initPaint() {

        pointPaint=new Paint();

        pointPaint.setColor(pointColor);

        pointPaint.setStyle(Paint.Style.FILL);

        pointPaint.setStrokeWidth(10);

        pointPaint.setStrokeJoin(Paint.Join.ROUND);

        pointPaint.setStrokeCap(Paint.Cap.ROUND);

        pointPaint.setAntiAlias(true);

        linePaint=new Paint();

        linePaint.setColor(lineColor);

        linePaint.setStyle(Paint.Style.STROKE);

        linePaint.setStrokeWidth(4);

        linePaint.setAntiAlias(true);

        textPaint=new Paint();

        textPaint.setStrokeWidth(3);

        textPaint.setTextSize(24);

        textPaint.setColor(Color.WHITE);

        textPaint.setTextAlign(Paint.Align.CENTER);

        fontMetrics = textPaint.getFontMetricsInt();

        textPaint.setAntiAlias(true);

    }

    @Override

    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

        // TODO Auto-generated method stub

        super.onMeasure(widthMeasureSpec, heightMeasureSpec);

    }

    @Override

    protected void onDraw(Canvas canvas) {

        // TODO Auto-generated method stub

        super.onDraw(canvas);

        float PointX = 0;

        float PointY=getHeight()/2;

        canvas.drawLine(0+getPaddingLeft(),PointY, getWidth()-getPaddingRight(), PointY, linePaint); //绘制直线

        int averageLength =(getWidth()-getPaddingLeft()-getPaddingRight())/(valueCountent-1);

        for(int i=0;i<valueCountent;i++){

            PointX=i*averageLength+getPaddingLeft();

            canvas.drawPoint(PointX, PointY, pointPaint);//绘制点

            if(pointList!=null && pointList.size()<valueCountent){

                pointList.add(PointX);//把每个点都放入集合中；

            }

        }

        sePoolTH.release();

        canvas.drawBitmap(mBitmap, bitmapPointX-bitmapWidth/2, PointY-bitmapHeight/2, null);//绘制拖动的图片

        canvas.drawText(""+index, bitmapPointX, (getHeight() - fontMetrics.ascent - fontMetrics.descent) / 2, textPaint); //绘制文字

    }

    long  startTime = 0;

    @Override

    public boolean onTouchEvent(MotionEvent event) {

        //获取手指的操作--》按下、移动、松开

        int action = event.getAction();

        switch (action) {

            case MotionEvent.ACTION_DOWN:

                startTime=System.currentTimeMillis();

                mBitmap=BitmapFactory.decodeResource(getResources(), bigPic);

                bitmapWidth=mBitmap.getWidth();

                bitmapHeight=mBitmap.getHeight();

                textPaint.setTextSize(30);

                //invalidate();

                break;

            case MotionEvent.ACTION_MOVE:

                long endTimeMove=System.currentTimeMillis();

                if(endTimeMove-startTime>100){//如果按下，抬起时间过大才认为是拖动，要执行动画。

                    bitmapPointX=event.getX();

                    updateIndex(bitmapPointX);

                    invalidate();

                }

                break;

            case MotionEvent.ACTION_UP:

                long  endTime=System.currentTimeMillis();

                bitmapPointX=event.getX();

                mBitmap=BitmapFactory.decodeResource(getResources(),smallPic);

                bitmapWidth=mBitmap.getWidth();

                bitmapHeight=mBitmap.getHeight();

                textPaint.setTextSize(24);

                if(endTime-startTime>200){//如果按下，抬起时间过大才认为是拖动，要执行动画。

                    updateBitmapUI(bitmapPointX);

                }else{

                    bitmapPointX=updateIndex(bitmapPointX);

                    invalidate();

                }

                startTime = 0;

                break;

        }

        return true;

    }

    //更新索引

    public float updateIndex(float pointX){

        float lastValue=100000;

        float currentValue=0;

        float minValue=0;

        for(float listX:pointList){

            currentValue= Math.abs(pointX-listX);

            mHashMap.put(currentValue, listX);//把差值和listX当做键值对保存起来，便于后期找出

            minValue=Math.min(lastValue,currentValue);

            lastValue=minValue;

        }

        if(mHashMap.containsKey(minValue)){

            mListX=mHashMap.get(minValue);

        }else{

            Log.e("BeautySeekBarView", "updateBitmapUI--->mHashMap.containsKey(minValue) is null");

            return -1;

        }

        if(pointList.contains(mListX)){

            index=pointList.indexOf(mListX)+1;

            if(mListener!=null){

                mListener.getIndex(index);

            }

        }else{

            Log.e("BeautySeekBarView", "updateBitmapUI--->pointList.contains(mListX) is null");

            return -1;

        }

        return mListX;

    }

    //当手指抬起后更新Bitmap的位置

    private void updateBitmapUI(float PointX2) {

        mListX=updateIndex(PointX2);

        //执行动画

        ValueAnimator anim = ValueAnimator.ofFloat(PointX2, mListX);

        anim.setDuration(50);

        anim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {

            @Override

            public void onAnimationUpdate(ValueAnimator animation) {

                bitmapPointX =(Float) animation.getAnimatedValue();

                invalidate();

            }

        });

        anim.start();

    }

    //设置等级点的数量

    public void pointValueCountent(int countent){

        if(countent<2){

            valueCountent=2;

        }else{

            valueCountent=countent;

        }

        invalidate();

    }

    //设置默认位置

    public void setPointLocation(final int location){

        new Thread(new Runnable() {

            @Override

            public void run() {

                try {

                    sePoolTH.acquire();

                } catch (InterruptedException e) {

                    // TODO Auto-generated catch block

                    e.printStackTrace();

                }

                if(location>0&&pointList!=null&& !pointList.isEmpty()){

                    bitmapPointX=pointList.get(location-1);

                    postInvalidate();

                }

            }

        }).start();

    }

    //提供接口回调，获取索引

    private indexListener mListener=null;

    public interface indexListener{

        void getIndex(int index);

    }

    public void setIndexListener(indexListener listener){

        mListener=listener;

    }

}

activity-main.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout

    xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    xmlns:ws="http://schemas.android.com/apk/res-auto"

    android:id="@+id/activity_main"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical"

    android:background="#ccc"

    tools:context="com.loaderman.beautyseekbarviewdemo.MainActivity">

    <com.loaderman.beautyseekbarviewdemo.BeautySeekBarView

        android:id="@+id/myView"

        android:layout_width="match_parent"

        android:layout_height="100dp"

        android:layout_centerVertical="true"

        ws:bigPic="@drawable/avatar_left"

        ws:lineColor="#FFFFFF"

        ws:padding="20dp"

        ws:pointColor="#FFFFFF"

        ws:smallPic="@drawable/number_bg"

        ws:valueCountent="6"/>

    <TextView

        android:id="@+id/tv"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"/>

</LinearLayout>

自定义属性assets.xml

<?xml version="1.0" encoding="utf-8"?>

<resources>

    <declare-styleable name="BeautySeekBarView">

        <attr name="valueCountent" format="integer"/>

        <attr name="padding" format="dimension"/>

        <attr name="pointColor" format="color"/>

        <attr name="lineColor" format="color"/>

        <attr name="smallPic" format="reference"/>

        <attr name="bigPic" format="reference"/>

    </declare-styleable>

</resources>

效果图:

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