device-2017-03-22-153115.png

圆形百分比view主要是对canvas的操作以及坐标的计算

/**
 * Description:
 * - - - - - - - - - - - - - - - - - - -
 * Created by HUI on 17/3/20.
 * - - - - - - - - - - - - - - - - - - -
 * Version 1.0.0
 */

public class CircleProgressView extends View {
    private static final int CIRCLE_RADIUS = 360;
    private static final int MAX_RADIUS = 300;    //外圆半径
    private static final int MIN_RADIUS = 280;    //内圆半径
    private static final float SCALE_SPACE = 3.6f;//刻度之间的间隔-->每3.6度画一格

    private int mWidth; //view宽
    private int mHeight;//View高
    private int centerX;    //view中心点 x
    private int centerY;    //view中心点 y
    private int mProgress = -1;  //当前进度
    private Paint circlePaint;//画圆画笔
    private Paint textPaint;//文字画笔
    private int defaultProgressColor = Color.parseColor("#bfcabf"); //默认刻度线颜色
    private int doneProgressColor = Color.parseColor("#ae850d");    //已完成刻度线颜色
    private float progressStrokeWidth = 4.0f;   //刻度线宽
    private int textSize = 40;  //中心文字大小
    private int textColor = Color.parseColor("#000000");    //文字颜色


    public CircleProgressView(Context context) {
        super(context);
        init(context, null);
    }

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

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

    private void init(Context context, AttributeSet attrs) {
        if (attrs != null) {
            //获取自定义属性
            TypedArray attributes = context.obtainStyledAttributes(attrs, R.styleable.CircleProgressView);
            defaultProgressColor = attributes.getColor(R.styleable.CircleProgressView_default_progress_color, Color.parseColor("#bfcabf"));
            doneProgressColor = attributes.getColor(R.styleable.CircleProgressView_done_progress_color, Color.parseColor("#ae850d"));
            progressStrokeWidth = attributes.getFloat(R.styleable.CircleProgressView_progress_stroke_width, 4.0f);
            textSize = attributes.getDimensionPixelSize(R.styleable.CircleProgressView_center_text_size, 40);
            textColor = attributes.getColor(R.styleable.CircleProgressView_center_text_color, Color.parseColor("#000000"));
            attributes.recycle();
        }

        //画圆画笔
        circlePaint = new Paint();
        circlePaint.setColor(defaultProgressColor);
        circlePaint.setAntiAlias(true);
        circlePaint.setStrokeWidth(progressStrokeWidth);
        circlePaint.setStyle(Paint.Style.FILL);

        //文字画笔
        textPaint = new Paint();
        textPaint.setColor(textColor);
        textPaint.setAntiAlias(true);
        textPaint.setTextSize(textSize);
        textPaint.setStyle(Paint.Style.FILL);
        textPaint.setTextAlign(Paint.Align.CENTER);
    }


    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        mWidth = MeasureSpec.getSize(widthMeasureSpec);
        mHeight = MeasureSpec.getSize(heightMeasureSpec);
        centerX = mWidth / 2;
        centerY = mHeight / 2;
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }

    @Override
    protected void onDraw(final Canvas canvas) {
        //①绘制一圈默认刻度
        circlePaint.setColor(defaultProgressColor);
        drawScale(canvas, CIRCLE_RADIUS, circlePaint);

        //②绘制文字
        Paint.FontMetrics fontMetrics = textPaint.getFontMetrics();
        float top = fontMetrics.top;
        float bottom = fontMetrics.bottom;
        //重新计算出文字中心点的Y坐标
        int textY = (int) (mHeight / 2 - top / 2 - bottom / 2);
        //展示进度
        canvas.drawText(Math.max(mProgress, 0) + "%", centerX, textY, textPaint);

        //③绘制已完成的刻度
        circlePaint.setColor(doneProgressColor);
        drawScale(canvas, mProgress * SCALE_SPACE, circlePaint);
    }

    //绘制刻度线
    private void drawScale(Canvas canvas, float progress, Paint paint) {
        if (progress <= 0) {
            return;
        }

        float degree;   //弧度
        float startX, startY, endX, endY;
        for (float i = 1, j; (j = i * SCALE_SPACE) <= progress ; i++) {
            degree = (float) getRadian(j);
            //刻度线的长度就是大圆与小圆的半径差
            startX = centerX + (float) Math.sin(degree) * MIN_RADIUS;
            startY = centerY - (float) Math.cos(degree) * MIN_RADIUS;
            endX = centerX + (float) Math.sin(degree) * MAX_RADIUS;
            endY = centerY - (float) Math.cos(degree) * MAX_RADIUS;
            canvas.drawLine(startX, startY, endX, endY, paint);
        }
    }


    //设置当前已完成进度
    public synchronized void setCurrentProgress(final int progress) {
        if (progress < 0 || progress > 100) {
            throw new RuntimeException("当前进度不合法");
        }
        new Thread(new Runnable() {
            @Override
            public void run() {
                for (int i = 0; i <= progress; i++) {
                    try {
                        Thread.sleep(15);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    mProgress = i;
                    postInvalidate();
                }

            }
        }).start();
    }

    //转化角度
    private double getRadian(float i) {
        return i * Math.PI / 180;
    }
}

</br>
在values文件夹下新建自定义属性文件attrs.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <declare-styleable name="CircleProgressView">
        <!--默认刻度颜色-->
        <attr name="default_progress_color" format="color|reference"/>
        <!--已完成刻度颜色-->
        <attr name="done_progress_color" format="color|reference"/>
        <!--刻度线宽度-->
        <attr name="progress_stroke_width" format="float"/>
        <!--文字大小-->
        <attr name="center_text_size" format="dimension"/>
        <!--文字颜色-->
        <attr name="center_text_color" format="color|reference"/>
    </declare-styleable>
</resources>

</br>
在布局中使用该自定义控件:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              xmlns:app="http://schemas.android.com/apk/res-auto"
              android:orientation="vertical"
              android:layout_width="match_parent"
              android:layout_height="match_parent">
    <Button
        android:text="设置进度75"
        android:id="@+id/start"
        android:layout_gravity="center_horizontal"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>
    
    
    <com.summer.tree.widget.CircleProgressView
        android:id="@+id/cv"
        android:layout_marginTop="20dp"
        app:default_progress_color="#bfcabf"
        app:done_progress_color="#ae850d"
        app:center_text_size="20dp"
        app:progress_stroke_width="6.0"
        app:center_text_color="#0000ff"
        android:layout_width="match_parent"
        android:layout_height="320dp"/>

</LinearLayout>

在代码中调用setCurrentProgress()方法设置具体进度范围0-100

效果图:

circleprogress.gif