src/com/android/settings/widget/DonutView.java - platform/packages/apps/Settings - Git at Google

 /*
  * Copyright (C) 2017 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License
  */
 package com.android.settings.widget;

 import android.content.Context;
 import android.content.res.Resources;
 import android.content.res.TypedArray;
 import android.graphics.Canvas;
 import android.graphics.ColorFilter;
 import android.graphics.Paint;
 import android.graphics.PorterDuff;
 import android.graphics.PorterDuffColorFilter;
 import android.graphics.Typeface;
 import android.icu.text.DecimalFormatSymbols;
 import android.text.Layout;
 import android.text.Spannable;
 import android.text.SpannableString;
 import android.text.Spanned;
 import android.text.StaticLayout;
 import android.text.TextPaint;
 import android.text.TextUtils;
 import android.text.style.RelativeSizeSpan;
 import android.util.AttributeSet;
 import android.view.View;

 import androidx.annotation.ColorRes;
 import androidx.annotation.VisibleForTesting;

 import com.android.settings.R;
 import com.android.settings.Utils;

 import java.util.Locale;

 /**
  * DonutView represents a donut graph. It visualizes a certain percentage of fullness with a
  * corresponding label with the fullness on the inside (i.e. "50%" inside of the donut).
  */
 public class DonutView extends View {
     private static final int TOP = -90;
     // From manual testing, this is the longest we can go without visual errors.
     private static final int LINE_CHARACTER_LIMIT = 10;
     private float mStrokeWidth;
     private double mPercent;
     private Paint mBackgroundCircle;
     private Paint mFilledArc;
     private TextPaint mTextPaint;
     private TextPaint mBigNumberPaint;
     private String mPercentString;
     private String mFullString;
     private boolean mShowPercentString = true;
     private int mMeterBackgroundColor;
     private int mMeterConsumedColor;

     public DonutView(Context context) {
         super(context);
     }

     public DonutView(Context context, AttributeSet attrs) {
         super(context, attrs);
         mMeterBackgroundColor = context.getColor(R.color.meter_background_color);
         mMeterConsumedColor = Utils.getColorStateListDefaultColor(mContext,
                 R.color.meter_consumed_color);
         boolean applyColorAccent = true;
         Resources resources = context.getResources();
         mStrokeWidth = resources.getDimension(R.dimen.storage_donut_thickness);

         if (attrs != null) {
             TypedArray styledAttrs = context.obtainStyledAttributes(attrs, R.styleable.DonutView);
             mMeterBackgroundColor = styledAttrs.getColor(R.styleable.DonutView_meterBackgroundColor,
                     mMeterBackgroundColor);
             mMeterConsumedColor = styledAttrs.getColor(R.styleable.DonutView_meterConsumedColor,
                     mMeterConsumedColor);
             applyColorAccent = styledAttrs.getBoolean(R.styleable.DonutView_applyColorAccent,
                     true);
             mShowPercentString = styledAttrs.getBoolean(R.styleable.DonutView_showPercentString,
                     true);
             mStrokeWidth = styledAttrs.getDimensionPixelSize(R.styleable.DonutView_thickness,
                     (int) mStrokeWidth);
             styledAttrs.recycle();
         }

         mBackgroundCircle = new Paint();
         mBackgroundCircle.setAntiAlias(true);
         mBackgroundCircle.setStrokeCap(Paint.Cap.BUTT);
         mBackgroundCircle.setStyle(Paint.Style.STROKE);
         mBackgroundCircle.setStrokeWidth(mStrokeWidth);
         mBackgroundCircle.setColor(mMeterBackgroundColor);

         mFilledArc = new Paint();
         mFilledArc.setAntiAlias(true);
         mFilledArc.setStrokeCap(Paint.Cap.BUTT);
         mFilledArc.setStyle(Paint.Style.STROKE);
         mFilledArc.setStrokeWidth(mStrokeWidth);
         mFilledArc.setColor(mMeterConsumedColor);

         if (applyColorAccent) {
             final ColorFilter mAccentColorFilter =
                     new PorterDuffColorFilter(
                             Utils.getColorAttrDefaultColor(context, android.R.attr.colorAccent),
                             PorterDuff.Mode.SRC_IN);
             mBackgroundCircle.setColorFilter(mAccentColorFilter);
             mFilledArc.setColorFilter(mAccentColorFilter);
         }

         final Locale locale = resources.getConfiguration().locale;
         final int layoutDirection = TextUtils.getLayoutDirectionFromLocale(locale);
         final int bidiFlags = (layoutDirection == LAYOUT_DIRECTION_LTR)
                 ? Paint.BIDI_LTR
                 : Paint.BIDI_RTL;

         mTextPaint = new TextPaint();
         mTextPaint.setColor(Utils.getColorAccentDefaultColor(getContext()));
         mTextPaint.setAntiAlias(true);
         mTextPaint.setTextSize(
                 resources.getDimension(R.dimen.storage_donut_view_label_text_size));
         mTextPaint.setTextAlign(Paint.Align.CENTER);
         mTextPaint.setBidiFlags(bidiFlags);

         mBigNumberPaint = new TextPaint();
         mBigNumberPaint.setColor(Utils.getColorAccentDefaultColor(getContext()));
         mBigNumberPaint.setAntiAlias(true);
         mBigNumberPaint.setTextSize(
                 resources.getDimension(R.dimen.storage_donut_view_percent_text_size));
         mBigNumberPaint.setTypeface(Typeface.create(
                 context.getString(com.android.internal.R.string.config_headlineFontFamily),
                 Typeface.NORMAL));
         mBigNumberPaint.setBidiFlags(bidiFlags);
     }

     @Override
     protected void onDraw(Canvas canvas) {
         super.onDraw(canvas);
         drawDonut(canvas);
         if (mShowPercentString) {
             drawInnerText(canvas);
         }
     }

     private void drawDonut(Canvas canvas) {
         canvas.drawArc(
                 0 + mStrokeWidth,
                 0 + mStrokeWidth,
                 getWidth() - mStrokeWidth,
                 getHeight() - mStrokeWidth,
                 TOP,
                 360,
                 false,
                 mBackgroundCircle);

         canvas.drawArc(
                 0 + mStrokeWidth,
                 0 + mStrokeWidth,
                 getWidth() - mStrokeWidth,
                 getHeight() - mStrokeWidth,
                 TOP,
                 (360 *  (float) mPercent),
                 false,
                 mFilledArc);
     }

     private void drawInnerText(Canvas canvas) {
         final float centerX = getWidth() / 2;
         final float centerY = getHeight() / 2;
         final float totalHeight = getTextHeight(mTextPaint) + getTextHeight(mBigNumberPaint);
         final float startY = centerY + totalHeight / 2;
         // Support from Android P
         final String localizedPercentSign = new DecimalFormatSymbols().getPercentString();

         // The first line y-coordinates start at (total height - all TextPaint height) / 2
         canvas.save();
         final Spannable percentStringSpan =
                 getPercentageStringSpannable(getResources(), mPercentString, localizedPercentSign);
         final StaticLayout percentStringLayout = new StaticLayout(percentStringSpan,
                 mBigNumberPaint, getWidth(), Layout.Alignment.ALIGN_CENTER, 1, 0, false);
         canvas.translate(0, (getHeight() - totalHeight) / 2);
         percentStringLayout.draw(canvas);
         canvas.restore();

         // The second line starts at the bottom + room for the descender.
         canvas.drawText(mFullString, centerX, startY - mTextPaint.descent(), mTextPaint);
     }

     /**
      * Set a percentage full to have the donut graph.
      */
     public void setPercentage(double percent) {
         mPercent = percent;
         mPercentString = Utils.formatPercentage(mPercent);
         mFullString = getContext().getString(R.string.storage_percent_full);
         if (mFullString.length() > LINE_CHARACTER_LIMIT) {
             mTextPaint.setTextSize(
                     getContext()
                             .getResources()
                             .getDimension(
                                     R.dimen.storage_donut_view_shrunken_label_text_size));
         }
         setContentDescription(getContext().getString(
                 R.string.join_two_unrelated_items, mPercentString, mFullString));
         invalidate();
     }

     @ColorRes
     public int getMeterBackgroundColor() {
         return mMeterBackgroundColor;
     }

     public void setMeterBackgroundColor(@ColorRes int meterBackgroundColor) {
         mMeterBackgroundColor = meterBackgroundColor;
         mBackgroundCircle.setColor(meterBackgroundColor);
         invalidate();
     }

     @ColorRes
     public int getMeterConsumedColor() {
         return mMeterConsumedColor;
     }

     public void setMeterConsumedColor(@ColorRes int meterConsumedColor) {
         mMeterConsumedColor = meterConsumedColor;
         mFilledArc.setColor(meterConsumedColor);
         invalidate();
     }

     @VisibleForTesting
     static Spannable getPercentageStringSpannable(
             Resources resources, String percentString, String percentageSignString) {
         final float fontProportion =
                 resources.getDimension(R.dimen.storage_donut_view_percent_sign_size)
                         / resources.getDimension(R.dimen.storage_donut_view_percent_text_size);
         final Spannable percentStringSpan = new SpannableString(percentString);
         int startIndex = percentString.indexOf(percentageSignString);
         int endIndex = startIndex + percentageSignString.length();

         // Fallback to no small string if we can't find the percentage sign.
         if (startIndex < 0) {
             startIndex = 0;
             endIndex = percentString.length();
         }

         percentStringSpan.setSpan(
                 new RelativeSizeSpan(fontProportion),
                 startIndex,
                 endIndex,
                 Spanned.SPAN_EXCLUSIVE_INCLUSIVE);
         return percentStringSpan;
     }

     private float getTextHeight(TextPaint paint) {
         // Technically, this should be the cap height, but I can live with the descent - ascent.
         return paint.descent() - paint.ascent();
     }
 }
	/*
	* Copyright (C) 2017 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License
	*/
	package com.android.settings.widget;

	import android.content.Context;
	import android.content.res.Resources;
	import android.content.res.TypedArray;
	import android.graphics.Canvas;
	import android.graphics.ColorFilter;
	import android.graphics.Paint;
	import android.graphics.PorterDuff;
	import android.graphics.PorterDuffColorFilter;
	import android.graphics.Typeface;
	import android.icu.text.DecimalFormatSymbols;
	import android.text.Layout;
	import android.text.Spannable;
	import android.text.SpannableString;
	import android.text.Spanned;
	import android.text.StaticLayout;
	import android.text.TextPaint;
	import android.text.TextUtils;
	import android.text.style.RelativeSizeSpan;
	import android.util.AttributeSet;
	import android.view.View;

	import androidx.annotation.ColorRes;
	import androidx.annotation.VisibleForTesting;

	import com.android.settings.R;
	import com.android.settings.Utils;

	import java.util.Locale;

	/**
	* DonutView represents a donut graph. It visualizes a certain percentage of fullness with a
	* corresponding label with the fullness on the inside (i.e. "50%" inside of the donut).
	*/
	public class DonutView extends View {
	private static final int TOP = -90;
	// From manual testing, this is the longest we can go without visual errors.
	private static final int LINE_CHARACTER_LIMIT = 10;
	private float mStrokeWidth;
	private double mPercent;
	private Paint mBackgroundCircle;
	private Paint mFilledArc;
	private TextPaint mTextPaint;
	private TextPaint mBigNumberPaint;
	private String mPercentString;
	private String mFullString;
	private boolean mShowPercentString = true;
	private int mMeterBackgroundColor;
	private int mMeterConsumedColor;

	public DonutView(Context context) {
	super(context);
	}

	public DonutView(Context context, AttributeSet attrs) {
	super(context, attrs);
	mMeterBackgroundColor = context.getColor(R.color.meter_background_color);
	mMeterConsumedColor = Utils.getColorStateListDefaultColor(mContext,
	R.color.meter_consumed_color);
	boolean applyColorAccent = true;
	Resources resources = context.getResources();
	mStrokeWidth = resources.getDimension(R.dimen.storage_donut_thickness);

	if (attrs != null) {
	TypedArray styledAttrs = context.obtainStyledAttributes(attrs, R.styleable.DonutView);
	mMeterBackgroundColor = styledAttrs.getColor(R.styleable.DonutView_meterBackgroundColor,
	mMeterBackgroundColor);
	mMeterConsumedColor = styledAttrs.getColor(R.styleable.DonutView_meterConsumedColor,
	mMeterConsumedColor);
	applyColorAccent = styledAttrs.getBoolean(R.styleable.DonutView_applyColorAccent,
	true);
	mShowPercentString = styledAttrs.getBoolean(R.styleable.DonutView_showPercentString,
	true);
	mStrokeWidth = styledAttrs.getDimensionPixelSize(R.styleable.DonutView_thickness,
	(int) mStrokeWidth);
	styledAttrs.recycle();
	}

	mBackgroundCircle = new Paint();
	mBackgroundCircle.setAntiAlias(true);
	mBackgroundCircle.setStrokeCap(Paint.Cap.BUTT);
	mBackgroundCircle.setStyle(Paint.Style.STROKE);
	mBackgroundCircle.setStrokeWidth(mStrokeWidth);
	mBackgroundCircle.setColor(mMeterBackgroundColor);

	mFilledArc = new Paint();
	mFilledArc.setAntiAlias(true);
	mFilledArc.setStrokeCap(Paint.Cap.BUTT);
	mFilledArc.setStyle(Paint.Style.STROKE);
	mFilledArc.setStrokeWidth(mStrokeWidth);
	mFilledArc.setColor(mMeterConsumedColor);

	if (applyColorAccent) {
	final ColorFilter mAccentColorFilter =
	new PorterDuffColorFilter(
	Utils.getColorAttrDefaultColor(context, android.R.attr.colorAccent),
	PorterDuff.Mode.SRC_IN);
	mBackgroundCircle.setColorFilter(mAccentColorFilter);
	mFilledArc.setColorFilter(mAccentColorFilter);
	}

	final Locale locale = resources.getConfiguration().locale;
	final int layoutDirection = TextUtils.getLayoutDirectionFromLocale(locale);
	final int bidiFlags = (layoutDirection == LAYOUT_DIRECTION_LTR)
	? Paint.BIDI_LTR
	: Paint.BIDI_RTL;

	mTextPaint = new TextPaint();
	mTextPaint.setColor(Utils.getColorAccentDefaultColor(getContext()));
	mTextPaint.setAntiAlias(true);
	mTextPaint.setTextSize(
	resources.getDimension(R.dimen.storage_donut_view_label_text_size));
	mTextPaint.setTextAlign(Paint.Align.CENTER);
	mTextPaint.setBidiFlags(bidiFlags);

	mBigNumberPaint = new TextPaint();
	mBigNumberPaint.setColor(Utils.getColorAccentDefaultColor(getContext()));
	mBigNumberPaint.setAntiAlias(true);
	mBigNumberPaint.setTextSize(
	resources.getDimension(R.dimen.storage_donut_view_percent_text_size));
	mBigNumberPaint.setTypeface(Typeface.create(
	context.getString(com.android.internal.R.string.config_headlineFontFamily),
	Typeface.NORMAL));
	mBigNumberPaint.setBidiFlags(bidiFlags);
	}

	@Override
	protected void onDraw(Canvas canvas) {
	super.onDraw(canvas);
	drawDonut(canvas);
	if (mShowPercentString) {
	drawInnerText(canvas);
	}
	}

	private void drawDonut(Canvas canvas) {
	canvas.drawArc(
	0 + mStrokeWidth,
	0 + mStrokeWidth,
	getWidth() - mStrokeWidth,
	getHeight() - mStrokeWidth,
	TOP,
	360,
	false,
	mBackgroundCircle);

	canvas.drawArc(
	0 + mStrokeWidth,
	0 + mStrokeWidth,
	getWidth() - mStrokeWidth,
	getHeight() - mStrokeWidth,
	TOP,
	(360 * (float) mPercent),
	false,
	mFilledArc);
	}

	private void drawInnerText(Canvas canvas) {
	final float centerX = getWidth() / 2;
	final float centerY = getHeight() / 2;
	final float totalHeight = getTextHeight(mTextPaint) + getTextHeight(mBigNumberPaint);
	final float startY = centerY + totalHeight / 2;
	// Support from Android P
	final String localizedPercentSign = new DecimalFormatSymbols().getPercentString();

	// The first line y-coordinates start at (total height - all TextPaint height) / 2
	canvas.save();
	final Spannable percentStringSpan =
	getPercentageStringSpannable(getResources(), mPercentString, localizedPercentSign);
	final StaticLayout percentStringLayout = new StaticLayout(percentStringSpan,
	mBigNumberPaint, getWidth(), Layout.Alignment.ALIGN_CENTER, 1, 0, false);
	canvas.translate(0, (getHeight() - totalHeight) / 2);
	percentStringLayout.draw(canvas);
	canvas.restore();

	// The second line starts at the bottom + room for the descender.
	canvas.drawText(mFullString, centerX, startY - mTextPaint.descent(), mTextPaint);
	}

	/**
	* Set a percentage full to have the donut graph.
	*/
	public void setPercentage(double percent) {
	mPercent = percent;
	mPercentString = Utils.formatPercentage(mPercent);
	mFullString = getContext().getString(R.string.storage_percent_full);
	if (mFullString.length() > LINE_CHARACTER_LIMIT) {
	mTextPaint.setTextSize(
	getContext()
	.getResources()
	.getDimension(
	R.dimen.storage_donut_view_shrunken_label_text_size));
	}
	setContentDescription(getContext().getString(
	R.string.join_two_unrelated_items, mPercentString, mFullString));
	invalidate();
	}

	@ColorRes
	public int getMeterBackgroundColor() {
	return mMeterBackgroundColor;
	}

	public void setMeterBackgroundColor(@ColorRes int meterBackgroundColor) {
	mMeterBackgroundColor = meterBackgroundColor;
	mBackgroundCircle.setColor(meterBackgroundColor);
	invalidate();
	}

	@ColorRes
	public int getMeterConsumedColor() {
	return mMeterConsumedColor;
	}

	public void setMeterConsumedColor(@ColorRes int meterConsumedColor) {
	mMeterConsumedColor = meterConsumedColor;
	mFilledArc.setColor(meterConsumedColor);
	invalidate();
	}

	@VisibleForTesting
	static Spannable getPercentageStringSpannable(
	Resources resources, String percentString, String percentageSignString) {
	final float fontProportion =
	resources.getDimension(R.dimen.storage_donut_view_percent_sign_size)
	/ resources.getDimension(R.dimen.storage_donut_view_percent_text_size);
	final Spannable percentStringSpan = new SpannableString(percentString);
	int startIndex = percentString.indexOf(percentageSignString);
	int endIndex = startIndex + percentageSignString.length();

	// Fallback to no small string if we can't find the percentage sign.
	if (startIndex < 0) {
	startIndex = 0;
	endIndex = percentString.length();
	}

	percentStringSpan.setSpan(
	new RelativeSizeSpan(fontProportion),
	startIndex,
	endIndex,
	Spanned.SPAN_EXCLUSIVE_INCLUSIVE);
	return percentStringSpan;
	}

	private float getTextHeight(TextPaint paint) {
	// Technically, this should be the cap height, but I can live with the descent - ascent.
	return paint.descent() - paint.ascent();
	}
	}