Android进阶之自定义View(2)高仿钉钉运动步数实现可动的进度圆环(上)

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Android进阶之自定义View(2)高仿钉钉运动步数实现可动的进度圆环(上)

懂音乐码虫 2018-08-08 08:42:00 浏览557
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本文比较详细的介绍了绘制圆环及圆弧的基础知识,为实现钉钉运动步数打下基础,实现了下面的效果,实现钉钉运动就灰常简单了,本文实现的初步效果如下:

如果想直接看钉钉运动的最终效果,请戳:Android进阶之自定义控件(2)高仿钉钉运动步数实现可动的进度圆环(下)

img_e846d6fd2f1477a28685e0ca588310f3.gif
Animation.gif

1、圆环的绘制
2、绘制背景圆环和进度圆环
3、绘制中间的文字
(1)使用drawArc(RectF oval, float startAngle, float sweepAngle, boolean useCenter, Paint paint)绘制圆环:
img_d093e0d8f03bba697e61b48648c9f60f.png
image.png

 public class SportStepView extends View {
    private Paint mPaint;
    //圆环绘制的宽度
    private int mRoundWidth = 40;

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

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

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

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        //获取宽的模式
        int widthMode = MeasureSpec.getMode(widthMeasureSpec);
        int heightMode = MeasureSpec.getMode(heightMeasureSpec);
        //获取宽的尺寸
        int widthSize = MeasureSpec.getSize(widthMeasureSpec);
        int heightSize = MeasureSpec.getSize(heightMeasureSpec);
        
        //对wrap_content这种模式进行处理
        if (heightMode == MeasureSpec.AT_MOST) {
            heightSize = widthSize;
        } 
        //绘制圆环以宽度为标准,保存丈量结果
        setMeasuredDimension(widthSize, heightSize);
    }

    private void init() {
        mPaint = new Paint();
        mPaint.setAntiAlias(true);
        mPaint.setStyle(Paint.Style.STROKE);
        mPaint.setColor(Color.RED);
        mPaint.setStrokeWidth(mRoundWidth);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
      //绘制圆,设置画笔的Style为Paint.Style.STROKE,则绘制出来的为圆环,否则绘制出来的为圆
      //canvas.drawCircle(getWidth() / 2, getHeight() / 2, getWidth() / 2 - mRoundWidth / 2, mPaint);
        RectF oval = new RectF(0 , 0, getWidth(), getWidth());
        //画圆弧 useCenter:是否显示圆内的横线 下面的绘制0,360的圆弧,也可以实现绘制圆环的效果
        canvas.drawArc(oval, 0, 360, false, mPaint);
    }
}

img_bc56fc212710b235922a872b0d41e758.png
image.png

会发现显示不全,绘制超出边界了,因为圆的宽度是在当前半径向两边展开的。如下图分析得知,圆所在的矩形区域不是rect(为屏幕的矩形区域),而是real Rect所在的区域:


img_35ad1d27d9f604baf5a47e96ce1818b0.png
image.png

因此只需要修改如下即可。

 RectF oval = new RectF(0 + mRoundWidth / 2, 0 + mRoundWidth / 2, getWidth() - mRoundWidth / 2, getWidth() - mRoundWidth / 2);
// RectF oval = new RectF(0 , 0, getWidth(), getWidth());
//画圆弧 useCenter:是否显示圆内的横线 下面的绘制0,360的圆弧,也可以实现绘制圆环的效果
 canvas.drawArc(oval, 0, 360, false, mPaint);

修改后达到我们的预期效果:


img_7049025487a8d2a977d848813310a1f4.png
image.png

(2)如果只是绘制上面的圆环效果,还可以使用: canvas.drawCircle()的方式实现,这种方法更简单:

 //绘制圆,设置画笔的Style为Paint.Style.STROKE,则绘制出来的为圆环,否则绘制出来的为圆
 //由于圆环本身有宽度,所以半径要减去圆环宽度的一半,不然一部分圆会在view外面。
 canvas.drawCircle(getWidth() / 2, getHeight() / 2, getWidth() / 2 - mRoundWidth / 2, mPaint);

(3)接下来我们来实现背景圆环+进度圆环的效果了,利用drawCircle绘制背景圆环,drawArc()绘制进度圆环,预期效果如下:


img_ea8e49fd6f4d511baf2cf4beeea53ce4.png
image.png

这个很简单,再画个圆弧即可:

   @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        //绘制背景圆环,设置画笔的Style为Paint.Style.STROKE,则绘制出来的为圆环,否则绘制出来的为圆
        //正常情况下
       canvas.drawCircle(getWidth() / 2, getHeight() / 2, getWidth() / 2 - mRoundWidth / 2, mPaint);

       //正常情况下,绘制进度圆环
      RectF oval = new RectF(0 + mProgressRoundWidth / 2, 0 + mProgressRoundWidth / 2, getWidth() - mProgressRoundWidth / 2, getWidth() - mProgressRoundWidth / 2);
            //画圆弧 useCenter:是否显示圆内的横线 下面的绘制0,360的圆弧,也可以实现绘制圆环的效果
            canvas.drawArc(oval, 0, 300, false, mProgressPaint);
    }

但是光这样处理,会有个小问题,就是当背景圆环和进度圆环宽度不一致时,会出现下面的问题。


img_89b3beb3d5af1c96eec93ef216c81808.png
image.png

解决方法:以宽度较大为准即可。

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

        /**
         * 如果背景圆环和进度圆环宽度不一致,都以较大的宽度为准绘制。避免出现两者显示不居中的问题
         */
        //绘制背景圆环,设置画笔的Style为Paint.Style.STROKE,则绘制出来的为圆环,否则绘制出来的为圆
//        canvas.drawCircle(getWidth() / 2, getHeight() / 2, getWidth() / 2, mPaint);
        if (mRoundWidth < mProgressRoundWidth) {
            canvas.drawCircle(getWidth() / 2, getHeight() / 2, getWidth() / 2 - mProgressRoundWidth / 2, mPaint);
        } else {
            //正常情况下
            canvas.drawCircle(getWidth() / 2, getHeight() / 2, getWidth() / 2 - mRoundWidth / 2, mPaint);
        }

        if (mRoundWidth < mProgressRoundWidth) {
            // //正常情况下,绘制进度圆环
            RectF oval = new RectF(0 + mProgressRoundWidth / 2, 0 + mProgressRoundWidth / 2, getWidth() - mProgressRoundWidth / 2, getWidth() - mProgressRoundWidth / 2);
            //        RectF oval = new RectF(0 , 0, getWidth(), getWidth());
            //画圆弧 useCenter:是否显示圆内的横线 下面的绘制0,360的圆弧,也可以实现绘制圆环的效果
            canvas.drawArc(oval, 0, 300, false, mProgressPaint);
        } else {
            //绘制进度圆环
            RectF oval = new RectF(0 + mRoundWidth / 2, 0 + mRoundWidth / 2, getWidth() - mRoundWidth / 2, getWidth() - mRoundWidth / 2);
            //画圆弧 useCenter:是否显示圆内的横线 下面的绘制0,360的圆弧,也可以实现绘制圆环的效果
            canvas.drawArc(oval, 0, 300, false, mProgressPaint);
        }
    }

(4)绘制居中的进度文字


img_33877873086c24770fbf490c806dcb34.png
image.png

代码实现:


   //绘制中间的文字
        Rect textRect = new Rect();
        //进度百分比
        int progressPercent = (int) (mCurrentProgress * 1f / mMaxProgress * 100);
        String mShowText = progressPercent + "%";
        mTextPaint.getTextBounds(mShowText, 0, mShowText.length(), textRect);
        canvas.drawText(mShowText, getWidth() / 2 - textRect.width() / 2, getHeight() / 2 + textRect.height() / 2, mTextPaint);
img_f84f2366e0fc9010e48b4c28fbd83336.png
image.png

(5)处理圆环进度和文字进度的动态显示
方法一:开一个分线程,动态改变进度的值,不断绘制达到进度变化的效果。
方法二:下篇会介绍到_
在测试的Activity中使用:

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
//        mytextview = findViewById(R.id.mytextview);
        final SportStepView sportStepView = findViewById(R.id.sportstepview);
        mCurrentProgress = 80;
        //速度,值越大,变化速度越快
        rate = 1;
        //开一个分线程,动态改变进度的值,不断绘制达到进度变化的效果
        new Thread(new Runnable() {
            @Override
            public void run() {
                sportStepView.setCurrentProgress(0);

                for (int i = 0; i < mCurrentProgress / rate; i++) {
                    sportStepView.setCurrentProgress(sportStepView.getCurrentProgress() + rate);
                    SystemClock.sleep(20);
//                pb_progress.invalidate();//invalidate()必须在主线程中执行,此处不能使用
                    sportStepView.postInvalidate();//强制重绘,postInvalidate()可以在主线程也可以在分线程中执行
                }
            }
        }).start();
    }

完整代码:

package com.example.jojo.learn.customview;

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

import com.example.jojo.learn.R;

/**
 * Created by JoJo on 2018/7/31.
 * wechat:18510829974
 * description: 仿钉钉运动步数
 */

public class SportStepView extends View {

    //绘制背景圆环的画笔
    private Paint mPaint;
    //绘制外面进度的圆环的画笔
    private Paint mProgressPaint;
    //绘制外面进度的圆环的画笔
    private Paint mTextPaint;
    //背景圆弧的绘制的宽度
    private int mRoundWidth = 40;
    //进度圆环的宽度
    private float mProgressRoundWidth = 60;
    private int mTextSize = 40;//单位 sp

    //圆环最大进度
    private int mMaxProgress = 100;
    //圆环当前进度
    private int mCurrentProgress = 0;

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

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

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

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        //获取宽的模式
        int widthMode = MeasureSpec.getMode(widthMeasureSpec);
        int heightMode = MeasureSpec.getMode(heightMeasureSpec);
        //获取宽的尺寸
        int widthSize = MeasureSpec.getSize(widthMeasureSpec);
        int heightSize = MeasureSpec.getSize(heightMeasureSpec);

        //对wrap_content这种模式进行处理
        if (heightMode == MeasureSpec.AT_MOST) {
            heightSize = widthSize;
        }
        //以宽度为标准保存丈量结果
        setMeasuredDimension(widthSize, heightSize);
    }

    private void init() {
        mPaint = new Paint();
        mPaint.setAntiAlias(true);
        mPaint.setStyle(Paint.Style.STROKE);
        mPaint.setColor(Color.RED);
        mPaint.setStrokeWidth(mRoundWidth);

        mProgressPaint = new Paint();
        mProgressPaint.setAntiAlias(true);// 抗锯齿效果
        mProgressPaint.setStyle(Paint.Style.STROKE);
        mProgressPaint.setColor(Color.YELLOW);
        mProgressPaint.setStrokeCap(Paint.Cap.ROUND);// 圆形笔头
        mProgressPaint.setStrokeWidth(mProgressRoundWidth);

        mTextPaint = new Paint();
        mTextPaint.setAntiAlias(true);// 抗锯齿效果
        mTextPaint.setStyle(Paint.Style.STROKE);
        mTextPaint.setColor(Color.BLACK);
        mTextPaint.setTextSize(sp2px(mTextSize));


    }

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


        /**
         * 如果背景圆环和进度圆环宽度不一致,都以较大的宽度为准绘制。避免出现两者显示不居中的问题
         */
        //绘制背景圆环,设置画笔的Style为Paint.Style.STROKE,则绘制出来的为圆环,否则绘制出来的为圆
//        canvas.drawCircle(getWidth() / 2, getHeight() / 2, getWidth() / 2, mPaint);
        if (mRoundWidth < mProgressRoundWidth) {
            canvas.drawCircle(getWidth() / 2, getHeight() / 2, getWidth() / 2 - mProgressRoundWidth / 2, mPaint);
        } else {
            //正常情况下
            canvas.drawCircle(getWidth() / 2, getHeight() / 2, getWidth() / 2 - mRoundWidth / 2, mPaint);
        }

        if (mRoundWidth < mProgressRoundWidth) {
            // //正常情况下,绘制进度圆环
            RectF oval = new RectF(0 + mProgressRoundWidth / 2, 0 + mProgressRoundWidth / 2, getWidth() - mProgressRoundWidth / 2, getWidth() - mProgressRoundWidth / 2);
            //        RectF oval = new RectF(0 , 0, getWidth(), getWidth());
            //画圆弧 useCenter:是否显示圆内的横线 下面的绘制0,360的圆弧,也可以实现绘制圆环的效果
            canvas.drawArc(oval, 0 + 90, mCurrentProgress * 1f / mMaxProgress * 360, false, mProgressPaint);
        } else {
            //绘制进度圆环
            RectF oval = new RectF(0 + mRoundWidth / 2, 0 + mRoundWidth / 2, getWidth() - mRoundWidth / 2, getWidth() - mRoundWidth / 2);
            //画圆弧 useCenter:是否显示圆内的横线 下面的绘制0,360的圆弧,也可以实现绘制圆环的效果
            canvas.drawArc(oval, 0 + 90, mCurrentProgress * 1f / mMaxProgress * 360, false, mProgressPaint);
        }


        //绘制中间的文字
        Rect textRect = new Rect();
        //进度百分比
        int progressPercent = (int) (mCurrentProgress * 1f / mMaxProgress * 100);
        String mShowText = progressPercent + "%";
        mTextPaint.getTextBounds(mShowText, 0, mShowText.length(), textRect);
        canvas.drawText(mShowText, getWidth() / 2 - textRect.width() / 2, getHeight() / 2 + textRect.height() / 2, mTextPaint);
    }

    public void setCurrentProgress(int currentProgress) {
        this.mCurrentProgress = currentProgress;
    }

    public void setMaxProgress(int maxProgress) {
        this.mMaxProgress = maxProgress;
    }

    public int getMaxProgress() {
        return mMaxProgress;
    }

    public int getCurrentProgress() {
        return mCurrentProgress;
    }


    /**
     * 将sp转换成px
     *
     * @param sp
     * @return
     */
    private int sp2px(int sp) {
        return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, sp,
                getResources().getDisplayMetrics());
    }
}

涉及到的自定义属性

   <!--SportStepView-->
    <declare-styleable name="SportStepView">
        <!--圆环半径-->
        <attr name="radius" format="dimension"></attr>
        <attr name="outerRoundColor" format="color"></attr>
        <attr name="innerRoundColor" format="color"></attr>
    </declare-styleable>

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