PieProgressDrawable.java

package com.tinkeringinc.androidcommon;

/**
 * Created by liron on 1/12/15.
 * from https://gist.github.com/dcow/9493477
 */

import android.content.Context;
import android.graphics.Color;
import android.graphics.drawable.Drawable;
import android.graphics.Canvas;
import android.graphics.ColorFilter;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.view.MotionEvent;
import android.widget.ScrollView;

/**
 * A PieProgressDrawable does this:
 * <a href="http://stackoverflow.com/questions/12458476/how-to-create-circular-progress-barpie-chart-like-indicator-android">Circular Progress Bar Android</a>
 */
public class PieProgressDrawable extends Drawable
{
  Paint mPaint;
  Paint mBackgroundPaint;
  Paint mBorderPaint;
  RectF mBoundsF;
  RectF mInnerBoundsF;
  final float START_ANGLE = -90;
  float mDrawTo;

  public PieProgressDrawable() {
    super();
    mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
    mBackgroundPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
    mBackgroundPaint.setColor(Color.TRANSPARENT);
    mBorderPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
  }

  /**
   * Set the border width.
   * @param widthDp in dip for the pie border
   */
  public void setBorderWidth(float widthDp, DisplayMetrics dm) {
    float borderWidth = widthDp * dm.density;
    mBorderPaint.setStrokeWidth(borderWidth);
  }

  /**
   * @param color you want the pie to be drawn in
   */
  public void setBorderColor(int color) {
    mBorderPaint.setColor(color);
  }

  /**
   * @param color you want the pie to be drawn in
   */
  public void setBackgroundColor(int color) {
    mBackgroundPaint.setColor(color);
  }

  /**
   * @param color you want the pie to be drawn in
   */
  public void setColor(int color) {
    mPaint.setColor(color);
  }

  @Override
  public void draw(Canvas canvas) {
    // Rotate the canvas around the center of the pie by 90 degrees
    // counter clockwise so the pie stars at 12 o'clock.
    //canvas.rotate(0, getBounds().centerX(), getBounds().centerY());
    mBackgroundPaint.setStyle(Paint.Style.FILL);
    canvas.drawOval(mBoundsF, mBackgroundPaint);

    mBorderPaint.setStyle(Paint.Style.STROKE);
    canvas.drawOval(mBoundsF, mBorderPaint);

    mPaint.setStyle(Paint.Style.FILL);
    if(Math.abs(mDrawTo) > 0.0001)
      canvas.drawArc(mInnerBoundsF, START_ANGLE, mDrawTo, true, mPaint);

    // Draw inner oval and text on top of the pie (or add any other
    // decorations such as a stroke) here..
    // Don't forget to rotate the canvas back if you plan to add text!
    // ...
  }

  @Override
  protected void onBoundsChange(Rect bounds) {
    super.onBoundsChange(bounds);
    mBoundsF = mInnerBoundsF = new RectF(bounds);
    final int halfBorder = (int) (mBorderPaint.getStrokeWidth()/2f + 0.5f);
    mInnerBoundsF.inset(halfBorder, halfBorder);
  }

  @Override
  protected boolean onLevelChange(int level) {
    final float drawTo = ((float)360*level)/100f;
    boolean update = drawTo != mDrawTo;
    mDrawTo = drawTo;
    return update;
  }

  @Override
  public void setAlpha(int alpha) {
    mPaint.setAlpha(alpha);
  }

  @Override
  public void setColorFilter(ColorFilter cf) {
    mPaint.setColorFilter(cf);
  }

  @Override
  public int getOpacity() {
    return mPaint.getAlpha();
  }

}