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转载自:http://blog.csdn.net/lmj623565791/article/details/43371299 ,本文出自:【张鸿洋的博客】
1、概述
最近需要用进度条,秉着不重复造轮子的原则,上github上搜索了一番,看了几个觉得比较好看的ProgressBar,比如:daimajia的等。简单看了下代码,基本都是继承自View,彻彻底底的自定义了一个进度条。盯着那绚丽滚动条,忽然觉得,为什么要通过View去写一个滚动条,系统已经提供了ProgressBar以及属于它的特性,我们没必要重新去构建一个,但是系统的又比较丑,不同版本变现还不一定一样。那么得出我们的目标:改变系统ProgressBar的样子。
对没错,我们没有必要去从0打造一个ProgressBar,人家虽然长的不好看,但是特性以及稳定性还是刚刚的,我们只需要为其整下容就ok了。
说到整容,大家都知道我们的控件是通过onDraw()画出来的,那么我们只需要去覆盖它的onDraw()方法,自己写下就ok 。
对了,我创建了一个微信公众号,欢迎关注,左边栏目上扫一扫即可。
接下来,我们贴下效果图:
2、效果图
1、横向的进度条
2、圆形的进度条
没错,这就是我们的进度条效果,横向的模仿了daimajia的进度条样子。不过我们继承子ProgressBar,简单的为其整个容,代码清晰易懂 。为什么说,易懂呢?
横向那个进度条,大家会drawLine()和drawText()吧,那么通过getWidth()拿到控件的宽度,再通过getProgress()拿到进度,按比例控制绘制线的长短,字的位置还不是分分钟的事。
github源码地址:Android-ProgressBarWidthNumber欢迎大家star or fork 。
3、实现
横向的滚动条绘制肯定需要一些属性,比如已/未到达进度的颜色、宽度,文本的颜色、大小等。
本来呢,我是想通过系统ProgressBar的progressDrawable,从里面提取一些属性完成绘制需要的参数的。但是,最终呢,反而让代码变得复杂。所以最终还是改用自定义属性。 说道自定义属性,大家应该已经不陌生了。
1、HorizontalProgressBarWithNumber
1、自定义属性
values/attr_progress_bar.xml:
- <?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>
2、构造中获取
- 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;
-
-
- protected Paint mPaint = new Paint();
-
- protected int mTextColor = DEFAULT_TEXT_COLOR;
-
- protected int mTextSize = sp2px(DEFAULT_TEXT_SIZE);
-
-
- protected int mTextOffset = dp2px(DEFAULT_SIZE_TEXT_OFFSET);
-
-
- protected int mReachedProgressBarHeight = dp2px(DEFAULT_HEIGHT_REACHED_PROGRESS_BAR);
-
-
- protected int mReachedBarColor = DEFAULT_TEXT_COLOR;
-
- protected int mUnReachedBarColor = DEFAULT_COLOR_UNREACHED_COLOR;
-
- protected int mUnReachedProgressBarHeight = dp2px(DEFAULT_HEIGHT_UNREACHED_PROGRESS_BAR);
-
- 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);
-
- setHorizontalScrollBarEnabled(true);
-
- obtainStyledAttributes(attrs);
-
- mPaint.setTextSize(mTextSize);
- mPaint.setColor(mTextColor);
-
- }
-
-
- private void obtainStyledAttributes(AttributeSet attrs)
- {
-
- 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();
- }
嗯,看起来代码挺长,其实都是在获取自定义属性,没什么技术含量。
3、onMeasure
刚才不是出onDraw里面写写就行了么,为什么要改onMeasure呢,主要是因为我们所有的属性比如进度条宽度让用户自定义了,所以我们的测量也得稍微变下。
- @Override
- protected synchronized void onMeasure(int widthMeasureSpec,
- int heightMeasureSpec)
- {
- int heightMode = MeasureSpec.getMode(heightMeasureSpec);
-
- if (heightMode != MeasureSpec.EXACTLY)
- {
-
- float textHeight = (mPaint.descent() + mPaint.ascent());
- int exceptHeight = (int) (getPaddingTop() + getPaddingBottom() + Math
- .max(Math.max(mReachedProgressBarHeight,
- mUnReachedProgressBarHeight), Math.abs(textHeight)));
-
- heightMeasureSpec = MeasureSpec.makeMeasureSpec(exceptHeight,
- MeasureSpec.EXACTLY);
- }
- super.onMeasure(widthMeasureSpec, heightMeasureSpec);
-
- }
宽度我们不变,所以的自定义属性不涉及宽度,高度呢,只考虑不是EXACTLY的情况(用户明确指定了,我们就不管了),根据padding和进度条宽度算出自己想要的,如果非EXACTLY下,我们进行exceptHeight封装,传入给控件进行测量高度。
测量完,就到我们的onDraw了~~~
4、onDraw
- @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() + "%";
-
-
- float textWidth = mPaint.measureText(text);
- float textHeight = (mPaint.descent() + mPaint.ascent()) / 2;
-
-
- if (progressPosX + textWidth > mRealWidth)
- {
- progressPosX = mRealWidth - textWidth;
- noNeedBg = true;
- }
-
-
- float endX = progressPosX - mTextOffset / 2;
- if (endX > 0)
- {
- mPaint.setColor(mReachedBarColor);
- mPaint.setStrokeWidth(mReachedProgressBarHeight);
- canvas.drawLine(0, 0, endX, 0, mPaint);
- }
-
-
- if (mIfDrawText)
- {
- mPaint.setColor(mTextColor);
- canvas.drawText(text, progressPosX, -textHeight, mPaint);
- }
-
-
- if (!noNeedBg)
- {
- float start = progressPosX + mTextOffset / 2 + textWidth;
- mPaint.setColor(mUnReachedBarColor);
- mPaint.setStrokeWidth(mUnReachedProgressBarHeight);
- canvas.drawLine(start, 0, mRealWidth, 0, mPaint);
- }
-
- canvas.restore();
-
- }
-
- @Override
- protected void onSizeChanged(int w, int h, int oldw, int oldh)
- {
- super.onSizeChanged(w, h, oldw, oldh);
- mRealWidth = w - getPaddingRight() - getPaddingLeft();
-
- }
其实核心方法就是onDraw了,但是呢,onDraw也很简单,绘制线、绘制文本、绘制线,结束。
还有两个简单的辅助方法:
- protected int dp2px(int dpVal)
- {
- return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
- dpVal, getResources().getDisplayMetrics());
- }
-
- protected int sp2px(int spVal)
- {
- return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP,
- spVal, getResources().getDisplayMetrics());
-
- }
好了,到此我们的横向进度就结束了,是不是很简单~~如果你是自定义View,你还得考虑progress的更新,考虑状态的销毁与恢复等等复杂的东西。
接下来看我们的RoundProgressBarWidthNumber圆形的进度条。
2、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 {
-
- private int mRadius = dp2px(30);
-
- 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();
-
- mTextSize = sp2px(14);
-
- mPaint.setStyle(Style.STROKE);
- mPaint.setAntiAlias(true);
- mPaint.setDither(true);
- mPaint.setStrokeCap(Cap.ROUND);
-
- }
-
- @Override
- protected synchronized void onMeasure(int widthMeasureSpec,
- int heightMeasureSpec) {
- int heightMode = MeasureSpec.getMode(heightMeasureSpec);
- int widthMode = MeasureSpec.getMode(widthMeasureSpec);
-
- int paintWidth = Math.max(mReachedProgressBarHeight,
- mUnReachedProgressBarHeight);
-
- if (heightMode != MeasureSpec.EXACTLY) {
-
- int exceptHeight = (int) (getPaddingTop() + getPaddingBottom()
- + mRadius * 2 + paintWidth);
- heightMeasureSpec = MeasureSpec.makeMeasureSpec(exceptHeight,
- MeasureSpec.EXACTLY);
- }
- if (widthMode != MeasureSpec.EXACTLY) {
- int exceptWidth = (int) (getPaddingLeft() + getPaddingRight()
- + mRadius * 2 + paintWidth);
- widthMeasureSpec = MeasureSpec.makeMeasureSpec(exceptWidth,
- MeasureSpec.EXACTLY);
- }
-
- super.onMeasure(heightMeasureSpec, heightMeasureSpec);
-
- }
-
- @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(), getPaddingTop());
- mPaint.setStyle(Style.STROKE);
-
- mPaint.setColor(mUnReachedBarColor);
- mPaint.setStrokeWidth(mUnReachedProgressBarHeight);
- canvas.drawCircle(mRadius, mRadius, mRadius, mPaint);
-
- 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);
-
- 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~~~
4、使用
布局文件
- <ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
- xmlns:tools="http://schemas.android.com/tools"
- xmlns:zhy="http://schemas.android.com/apk/res-auto"
- android:layout_width="match_parent"
- android:layout_height="match_parent" >
-
- <LinearLayout
- android:layout_width="match_parent"
- android:layout_height="match_parent"
- android:orientation="vertical"
- android:padding="25dp" >
-
- <com.zhy.view.HorizontalProgressBarWithNumber
- android:id="@+id/id_progressbar01"
- android:layout_width="match_parent"
- android:layout_height="wrap_content"
- android:layout_marginTop="50dip"
- android:padding="5dp" />
-
-
-
- <com.zhy.view.HorizontalProgressBarWithNumber
- android:layout_width="match_parent"
- android:layout_height="wrap_content"
- android:layout_marginTop="50dip"
- android:padding="5dp"
- android:progress="50"
- zhy:progress_text_color="#ffF53B03"
- zhy:progress_unreached_color="#ffF7C6B7" />
-
- <com.zhy.view.RoundProgressBarWidthNumber
- android:id="@+id/id_progress02"
- android:layout_width="match_parent"
- android:layout_height="wrap_content"
- android:layout_marginTop="50dip"
- android:padding="5dp"
- android:progress="30" />
-
- <com.zhy.view.RoundProgressBarWidthNumber
- android:layout_width="match_parent"
- android:layout_height="wrap_content"
- android:layout_marginTop="50dip"
- android:padding="5dp"
- android:progress="50"
- zhy:progress_reached_bar_height="20dp"
- zhy:progress_text_color="#ffF53B03"
- zhy:radius="60dp" />
-
- </LinearLayout>
-
- </ScrollView>
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);
-
- }
-
- }
最后,本篇博客的目的呢?就是为了说下,类似ProgressBar这样的控件,如果你只是想去改变显示的样子,完全没必要从0去创建,复写onDraw即可,当然是个人观点,提出供大家参考。
源码点击下载
(六十六)Android打造形形色色的进度条 (转载自:http://blog.csdn.net/lmj623565791/article/details/43371299)
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原文地址:http://www.cnblogs.com/fuyanan/p/4530655.html