android 自定义View（3）圆形View 加速条

分析加速条 一个圆环两种颜色， 加速的速度 圆环的宽度

firstColor

secondColor

speed

circleWidth;

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

    <attr name="firstColor" format="color"></attr>
    <attr name="secondColor" format="color"></attr>
    <attr name="circleWidth" format="dimension"></attr>
    <attr name="speed" format="integer"></attr>

    <declare-styleable name="CustomProgress">
        <attr name="firstColor"></attr>
        <attr name="secondColor"></attr>
        <attr name="circleWidth"></attr>
        <attr name="speed"></attr>
    </declare-styleable>

</resources>

package com.zhy.customview02;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.View;

public class CustomProgress extends View {
    /**
     * 第一圈颜色
     */
    private int firstColor;
    /**
     * 第二圈颜色
     */
    private int secondColor;
    /**
     * 圆的宽度
     */
    private int circleWidth;
    /**
     * 速度
     */
    private int speed;
    /**
     * 当前的进度
     */
    private int curProgress;
    /**
     * 画笔
     */
    private Paint mPaint;

    boolean isNext = false;

    public CustomProgress(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        TypedArray typedArray = context.getTheme().obtainStyledAttributes(attrs, R.styleable.CustomProgress, defStyle, 0);
        initView(typedArray);
    }
    public CustomProgress(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }
    public CustomProgress(Context context) {
        super(context, null);
    }

    public void initView(TypedArray typedArray){
        int n = typedArray.getIndexCount();
        for (int i = 0; i < n; i++) {
            int attr = typedArray.getIndex(i);
            switch (attr) {
            case R.styleable.CustomProgress_firstColor:
                firstColor = typedArray.getColor(attr, Color.GREEN);
                break;
            case R.styleable.CustomProgress_secondColor:
                secondColor = typedArray.getColor(attr, Color.RED);
                break;
            case R.styleable.CustomProgress_speed:
                speed = typedArray.getInt(attr, 20);
                break;
            case R.styleable.CustomProgress_circleWidth:
                circleWidth = typedArray.getDimensionPixelSize(attr, (int) TypedValue.applyDimension(
                        TypedValue.COMPLEX_UNIT_PX, 20, getResources().getDisplayMetrics()));
                break;
            default:
                break;
            }
        }
        typedArray.recycle();
        mPaint = new Paint();

        new Thread(new Runnable(){
            @Override
            public void run() {
                while(true){
                    curProgress += speed;
                    if(curProgress == 360){
                        curProgress = 0;
                        if(!isNext){
                            isNext = true;
                        }else {
                            isNext = false;
                        }
                    }
                    postInvalidate();
                    try {
                        Thread.sleep(500);
                    } catch (InterruptedException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }

                }
            }
        }).start();
    }

    @Override
    protected void onDraw(Canvas canvas) {

        int center =getWidth()/2;
        int radius = center - circleWidth/2;
        mPaint.setStrokeWidth(circleWidth);
        mPaint.setStyle(Paint.Style.STROKE);
        mPaint.setAntiAlias(true);
        RectF oval = new RectF(center-radius, center-radius, center+radius, center+radius);
        //canvas.drawArc(oval, 0, 360, false, mPaint);
        if(isNext){
            mPaint.setColor(firstColor);
            canvas.drawCircle(center, center, radius, mPaint);//画圆

            mPaint.setColor(secondColor);
            canvas.drawArc(oval, -90, curProgress, false, mPaint);

        }else{
            mPaint.setColor(secondColor);
            canvas.drawCircle(center, center, radius, mPaint);//画圆

            mPaint.setColor(firstColor);
            canvas.drawArc(oval, -90, curProgress, false, mPaint);
        }

    }

}