103 lines
3.7 KiB
Java
103 lines
3.7 KiB
Java
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License
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*/
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package com.android.settings.widget;
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import android.content.Context;
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import android.graphics.Canvas;
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import android.graphics.Paint;
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import android.text.TextPaint;
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import android.util.AttributeSet;
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import android.view.View;
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import com.android.settings.R;
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import com.android.settings.Utils;
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/**
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* DonutView represents a donut graph. It visualizes a certain percentage of fullness with a
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* corresponding label with the fullness on the inside (i.e. "50%" inside of the donut.
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*/
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public class DonutView extends View {
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private static final int TOP = -90;
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private float mStrokeWidth;
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private int mPercent;
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private Paint mBackgroundCircle;
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private Paint mFilledArc;
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private TextPaint mTextPaint;
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public DonutView(Context context) {
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super(context);
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}
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public DonutView(Context context, AttributeSet attrs) {
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super(context, attrs);
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float density = getResources().getDisplayMetrics().density;
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mStrokeWidth = 6f * density;
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mBackgroundCircle = new Paint();
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mBackgroundCircle.setAntiAlias(true);
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mBackgroundCircle.setStrokeCap(Paint.Cap.BUTT);
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mBackgroundCircle.setStyle(Paint.Style.STROKE);
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mBackgroundCircle.setStrokeWidth(mStrokeWidth);
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mBackgroundCircle.setColor(getResources().getColor(R.color.donut_background_grey));
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mFilledArc = new Paint();
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mFilledArc.setAntiAlias(true);
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mFilledArc.setStrokeCap(Paint.Cap.BUTT);
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mFilledArc.setStyle(Paint.Style.STROKE);
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mFilledArc.setStrokeWidth(mStrokeWidth);
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mFilledArc.setColor(Utils.getColorAccent(getContext()));
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mTextPaint = new TextPaint();
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mTextPaint.setColor(Utils.getColorAccent(getContext()));
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mTextPaint.setAntiAlias(true);
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mTextPaint.setTextSize(18f * density);
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mTextPaint.setTextAlign(Paint.Align.CENTER);
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}
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@Override
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protected void onDraw(Canvas canvas) {
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super.onDraw(canvas);
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canvas.drawArc(0 + mStrokeWidth, 0 + mStrokeWidth, getWidth() - mStrokeWidth,
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getHeight() - mStrokeWidth, TOP, 360, false, mBackgroundCircle);
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canvas.drawArc(0 + mStrokeWidth, 0 + mStrokeWidth, getWidth() - mStrokeWidth,
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getHeight() - mStrokeWidth, TOP, (360 * mPercent / 100), false, mFilledArc);
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int centerX = getWidth() / 2;
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int centerY = getHeight() / 2;
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String percentString =
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String.format(getContext().getString(R.string.storage_percent_used), mPercent);
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// drawText uses the Y dimension as the floor of the text, so we do this to center.
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canvas.drawText(percentString, centerX,
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centerY + getTextHeight(mTextPaint) / 2 - mTextPaint.descent(),
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mTextPaint);
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}
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/**
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* Set a percentage full to have the donut graph.
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*/
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public void setPercentage(int percent) {
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mPercent = percent;
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invalidate();
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}
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private float getTextHeight(TextPaint paint) {
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// Technically, this should be the cap height, but I can live with the descent - ascent.
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return paint.descent() - paint.ascent();
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}
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}
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