Circle ProgressBar

CircleProgressBar.java

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.support.annotation.NonNull;
import android.util.AttributeSet;
import android.view.View;

import com.theonepiano.smartpiano.R;

public class CircleProgressBar extends View {
    private int mProgress;
    private float mStrokeWidth;
    private int mTextRatio;
    private Paint mPaint;
    private RectF mOval;

    private int mStrokeColor, mProgressColor, mTextColor;


    public CircleProgressBar(Context context, AttributeSet attrs) {
        super(context, attrs);
        /*
        <declare-styleable name="CircleProgressBar">
        <attr name="strokeColor"/>
        <attr name="strokeWidth"/>
        <attr name="progressColor" format="reference|color"/>
        <attr name="textColor" format="reference|color"/>
        <attr name="textRatio" format="reference|integer"/>
        </declare-styleable>
         */
        TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.CircleProgressBar);
        mStrokeWidth = ta.getDimension(R.styleable.CircleProgressBar_strokeWidth, 4);
        mTextRatio = ta.getInt(R.styleable.CircleProgressBar_textRatio, 4);
        mStrokeColor = ta.getColor(R.styleable.CircleProgressBar_strokeColor,
                android.R.color.black);
        mProgressColor = ta.getColor(R.styleable.CircleProgressBar_progressColor,
                android.R.color.white);
        mTextColor = ta.getColor(R.styleable.CircleProgressBar_textColor, android.R.color.white);
        ta.recycle();

        mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        mOval = new RectF();
    }


    @Override
    public void draw(@NonNull Canvas canvas) {
        super.draw(canvas);

        canvas.drawColor(Color.TRANSPARENT);
        int diameter = Math.min(getWidth(), getHeight());

        mOval.left = mStrokeWidth / 2;
        mOval.top = mStrokeWidth / 2;
        mOval.right = diameter - mStrokeWidth / 2;
        mOval.bottom = diameter - mStrokeWidth / 2;

        mPaint.setStrokeWidth(mStrokeWidth);
        mPaint.setStyle(Paint.Style.STROKE);
        mPaint.setColor(mStrokeColor);
        canvas.drawArc(mOval, -90, 360, false, mPaint);

        mPaint.setColor(mProgressColor);
        float sweepAngel = mProgress / 100.0f * 360.0f;
        canvas.drawArc(mOval, -90, sweepAngel, false, mPaint);

        mPaint.setColor(mTextColor);
        String text = mProgress + "%";
        int textHeight = diameter / mTextRatio;
        mPaint.setTextSize(textHeight);
        float textWidth = mPaint.measureText(text);
        mPaint.setStyle(Paint.Style.FILL);
        canvas.drawText(text, diameter / 2 - textWidth / 2, diameter / 2 + textHeight / 2, mPaint);
    }

    public void setProgress(int progress) {
        this.mProgress = progress;
        invalidate();
    }

    public void setProgressNotInUiThread(int progress) {
        this.mProgress = progress;
        this.postInvalidate();
    }
}