Android自定义progressBar

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通过继承系统ProgressBar实现

效果图

实现

HorizontalProgressBarWithNumber

自定义属性

<?xml version="1.0" encoding="utf-8"?> <resources> <declare-styleable name="HorizontalProgressBarWithNumber"> <attr name="progress_unreached_color" format="color" /> <attr name="progress_reached_color" format="color" /> <attr name="progress_reached_bar_height" format="dimension" /> <attr name="progress_unreached_bar_height" format="dimension" /> <attr name="progress_text_size" format="dimension" /> <attr name="progress_text_color" format="color" /> <attr name="progress_text_offset" format="dimension" /> <attr name="progress_text_visibility" format="enum"> <enum name="visible" value="0" /> <enum name="invisible" value="1" /> </attr> </declare-styleable> <declare-styleable name="RoundProgressBarWidthNumber"> <attr name="radius" format="dimension" /> </declare-styleable></resources>

HorizontalProgressBarWithNumber

package com.zhy.view;import android.content.Context; import android.content.res.TypedArray; import android.graphics.Canvas; import android.graphics.Paint; import android.util.AttributeSet; import android.util.Log; import android.util.TypedValue; import android.widget.ProgressBar;import com.zhy.library.view.R;public class HorizontalProgressBarWithNumber extends ProgressBar { private static final int DEFAULT_TEXT_SIZE = 10; private static final int DEFAULT_TEXT_COLOR = 0XFFFC00D1; private static final int DEFAULT_COLOR_UNREACHED_COLOR = 0xFFd3d6da; private static final int DEFAULT_HEIGHT_REACHED_PROGRESS_BAR = 2; private static final int DEFAULT_HEIGHT_UNREACHED_PROGRESS_BAR = 2; private static final int DEFAULT_SIZE_TEXT_OFFSET = 10; /** * painter of all drawing things */ protected Paint mPaint = new Paint(); /** * color of progress number */ protected int mTextColor = DEFAULT_TEXT_COLOR; /** * size of text (sp) */ protected int mTextSize = sp2px(DEFAULT_TEXT_SIZE); /** * offset of draw progress */ protected int mTextOffset = dp2px(DEFAULT_SIZE_TEXT_OFFSET); /** * height of reached progress bar */ protected int mReachedProgressBarHeight = dp2px(DEFAULT_HEIGHT_REACHED_PROGRESS_BAR); /** * color of reached bar */ protected int mReachedBarColor = DEFAULT_TEXT_COLOR; /** * color of unreached bar */ protected int mUnReachedBarColor = DEFAULT_COLOR_UNREACHED_COLOR; /** * height of unreached progress bar */ protected int mUnReachedProgressBarHeight = dp2px(DEFAULT_HEIGHT_UNREACHED_PROGRESS_BAR); /** * view width except padding */ protected int mRealWidth; protected boolean mIfDrawText = true; protected static final int VISIBLE = 0; public HorizontalProgressBarWithNumber(Context context, AttributeSet attrs) { this(context, attrs, 0); } public HorizontalProgressBarWithNumber(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); obtainStyledAttributes(attrs); mPaint.setTextSize(mTextSize); mPaint.setColor(mTextColor); } @Override protected synchronized void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { int width = MeasureSpec.getSize(widthMeasureSpec); int height = measureHeight(heightMeasureSpec); setMeasuredDimension(width, height); mRealWidth = getMeasuredWidth() - getPaddingRight() - getPaddingLeft(); } private int measureHeight(int measureSpec) { int result = 0; int specMode = MeasureSpec.getMode(measureSpec); int specSize = MeasureSpec.getSize(measureSpec); if (specMode == MeasureSpec.EXACTLY) { result = specSize; } else { float textHeight = (mPaint.descent() - mPaint.ascent()); result = (int) (getPaddingTop() + getPaddingBottom() + Math.max( Math.max(mReachedProgressBarHeight, mUnReachedProgressBarHeight), Math.abs(textHeight))); if (specMode == MeasureSpec.AT_MOST) { result = Math.min(result, specSize); } } return result; } /** * get the styled attributes * * @param attrs */ private void obtainStyledAttributes(AttributeSet attrs) { // init values from custom attributes final TypedArray attributes = getContext().obtainStyledAttributes( attrs, R.styleable.HorizontalProgressBarWithNumber); mTextColor = attributes .getColor( R.styleable.HorizontalProgressBarWithNumber_progress_text_color, DEFAULT_TEXT_COLOR); mTextSize = (int) attributes.getDimension( R.styleable.HorizontalProgressBarWithNumber_progress_text_size, mTextSize); mReachedBarColor = attributes .getColor( R.styleable.HorizontalProgressBarWithNumber_progress_reached_color, mTextColor); mUnReachedBarColor = attributes .getColor( R.styleable.HorizontalProgressBarWithNumber_progress_unreached_color, DEFAULT_COLOR_UNREACHED_COLOR); mReachedProgressBarHeight = (int) attributes .getDimension( R.styleable.HorizontalProgressBarWithNumber_progress_reached_bar_height, mReachedProgressBarHeight); mUnReachedProgressBarHeight = (int) attributes .getDimension( R.styleable.HorizontalProgressBarWithNumber_progress_unreached_bar_height, mUnReachedProgressBarHeight); mTextOffset = (int) attributes .getDimension( R.styleable.HorizontalProgressBarWithNumber_progress_text_offset, mTextOffset); int textVisible = attributes .getInt(R.styleable.HorizontalProgressBarWithNumber_progress_text_visibility, VISIBLE); if (textVisible != VISIBLE) { mIfDrawText = false; } attributes.recycle(); } @Override protected synchronized void onDraw(Canvas canvas) { canvas.save(); canvas.translate(getPaddingLeft(), getHeight() / 2); boolean noNeedBg = false; float radio = getProgress() * 1.0f / getMax(); float progressPosX = (int) (mRealWidth * radio); String text = getProgress() + "%"; // mPaint.getTextBounds(text, 0, text.length(), mTextBound); float textWidth = mPaint.measureText(text); float textHeight = (mPaint.descent() + mPaint.ascent()) / 2; if (progressPosX + textWidth > mRealWidth) { progressPosX = mRealWidth - textWidth; noNeedBg = true; } // draw reached bar float endX = progressPosX - mTextOffset / 2; if (endX > 0) { mPaint.setColor(mReachedBarColor); mPaint.setStrokeWidth(mReachedProgressBarHeight); canvas.drawLine(0, 0, endX, 0, mPaint); } // draw progress bar // measure text bound if (mIfDrawText) { mPaint.setColor(mTextColor); canvas.drawText(text, progressPosX, -textHeight, mPaint); } // draw unreached bar if (!noNeedBg) { float start = progressPosX + mTextOffset / 2 + textWidth; mPaint.setColor(mUnReachedBarColor); mPaint.setStrokeWidth(mUnReachedProgressBarHeight); canvas.drawLine(start, 0, mRealWidth, 0, mPaint); } canvas.restore(); } /** * dp 2 px * * @param dpVal */ protected int dp2px(int dpVal) { return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dpVal, getResources().getDisplayMetrics()); } /** * sp 2 px * * @param spVal * @return */ protected int sp2px(int spVal) { return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, spVal, getResources().getDisplayMetrics()); }}

主要重写了onMeasure与onDraw方法

RoundProgressBarWidthNumber

圆形的进度条和横向的进度条基本变量都是一致的，于是我就让RoundProgressBarWidthNumber extends HorizontalProgressBarWithNumber 了。

然后需要改变的就是测量和onDraw了：

完整代码

package com.zhy.view;import android.content.Context; import android.content.res.TypedArray; import android.graphics.Canvas; import android.graphics.Paint.Cap; import android.graphics.Paint.Style; import android.graphics.RectF; import android.util.AttributeSet;import com.zhy.library.view.R;public class RoundProgressBarWidthNumber extends HorizontalProgressBarWithNumber { /** * mRadius of view */ private int mRadius = dp2px(30); private int mMaxPaintWidth; public RoundProgressBarWidthNumber(Context context) { this(context, null); } public RoundProgressBarWidthNumber(Context context, AttributeSet attrs) { super(context, attrs); mReachedProgressBarHeight = (int) (mUnReachedProgressBarHeight * 2.5f); TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.RoundProgressBarWidthNumber); mRadius = (int) ta.getDimension( R.styleable.RoundProgressBarWidthNumber_radius, mRadius); ta.recycle(); mPaint.setStyle(Style.STROKE); mPaint.setAntiAlias(true); mPaint.setDither(true); mPaint.setStrokeCap(Cap.ROUND); } /** * 这里默认在布局中padding值要么不设置，要么全部设置 */ @Override protected synchronized void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { mMaxPaintWidth = Math.max(mReachedProgressBarHeight, mUnReachedProgressBarHeight); int expect = mRadius * 2 + mMaxPaintWidth + getPaddingLeft() + getPaddingRight(); int width = resolveSize(expect, widthMeasureSpec); int height = resolveSize(expect, heightMeasureSpec); int realWidth = Math.min(width, height); mRadius = (realWidth - getPaddingLeft() - getPaddingRight() - mMaxPaintWidth) / 2; setMeasuredDimension(realWidth, realWidth); } @Override protected synchronized void onDraw(Canvas canvas) { String text = getProgress() + "%"; float textWidth = mPaint.measureText(text); float textHeight = (mPaint.descent() + mPaint.ascent()) / 2; canvas.save(); canvas.translate(getPaddingLeft() + mMaxPaintWidth / 2, getPaddingTop() + mMaxPaintWidth / 2); mPaint.setStyle(Style.STROKE); // draw unreaded bar mPaint.setColor(mUnReachedBarColor); mPaint.setStrokeWidth(mUnReachedProgressBarHeight); canvas.drawCircle(mRadius, mRadius, mRadius, mPaint); // draw reached bar mPaint.setColor(mReachedBarColor); mPaint.setStrokeWidth(mReachedProgressBarHeight); float sweepAngle = getProgress() * 1.0f / getMax() * 360; canvas.drawArc(new RectF(0, 0, mRadius * 2, mRadius * 2), 0, sweepAngle, false, mPaint); // draw text mPaint.setStyle(Style.FILL); canvas.drawText(text, mRadius - textWidth / 2, mRadius - textHeight, mPaint); canvas.restore(); }}

首先获取它的专有属性mRadius，然后根据此属性去测量，测量完成绘制；

绘制的过程呢？

先绘制一个细一点的圆，然后绘制一个粗一点的弧度，二者叠在一起就行。文本呢，绘制在中间~~~总体，没什么代码量。

好了，两个进度条就到这了，是不是发现简单很多。总体设计上，存在些问题，如果抽取一个BaseProgressBar用于获取公共的属性；然后不同样子的进度条继承分别实现自己的测量和样子，这样结构可能会清晰些~

使用

布局文件

MainActivity

package com.zhy.sample.progressbar;import android.app.Activity; import android.os.Bundle; import android.os.Handler;import com.zhy.annotation.Log; import com.zhy.view.HorizontalProgressBarWithNumber;public class MainActivity extends Activity { private HorizontalProgressBarWithNumber mProgressBar; private static final int MSG_PROGRESS_UPDATE = 0x110; private Handler mHandler = new Handler() { @Log public void handleMessage(android.os.Message msg) { int progress = mProgressBar.getProgress(); mProgressBar.setProgress(++progress); if (progress >= 100) { mHandler.removeMessages(MSG_PROGRESS_UPDATE); } mHandler.sendEmptyMessageDelayed(MSG_PROGRESS_UPDATE, 100); }; }; @Log @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mProgressBar = (HorizontalProgressBarWithNumber) findViewById(R.id.id_progressbar01); mHandler.sendEmptyMessage(MSG_PROGRESS_UPDATE); }}

知识点

paint.ascent()和paint.descent()

1.基准点是baseline

2.ascent：是baseline之上至字符最高处的距离

3.descent：是baseline之下至字符最低处的距离

4.leading：是上一行字符的descent到下一行的ascent之间的距离,也就是相邻行间的空白距离

5.top：是指的是最高字符到baseline的值,即ascent的最大值

6.bottom：是指最低字符到baseline的值,即descent的最大值

View.resolveSize(int size,int measureSpec)

代码如下

public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { int result = size; int specMode = MeasureSpec.getMode(measureSpec); int specSize = MeasureSpec.getSize(measureSpec); switch (specMode) { case MeasureSpec.UNSPECIFIED: result = size; break; case MeasureSpec.AT_MOST: if (specSize < size) { result = specSize | MEASURED_STATE_TOO_SMALL; } else { result = size; } break; case MeasureSpec.EXACTLY: result = specSize; break; } return result | (childMeasuredState&MEASURED_STATE_MASK); }