Android应用中炫酷的横向和环形进度条的实例分享

一、概述
最近需要用进度条，秉着不重复造*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。
接下来，我们贴下效果图：
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。

二、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; 
 
  /** 
   * 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); 
     
    sethorizontalscrollbarenabled(true); 
 
    obtainstyledattributes(attrs); 
 
    mpaint.settextsize(mtextsize); 
    mpaint.setcolor(mtextcolor); 
 
  } 
   
  /** 
   * 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(); 
  } 

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(); 
    //画笔平移到指定paddingleft， getheight() / 2位置，注意以后坐标都为以此为0，0 
    canvas.translate(getpaddingleft(), getheight() / 2); 
 
    boolean noneedbg = false; 
    //当前进度和总值的比例 
    float radio = getprogress() * 1.0f / getmax(); 
    //已到达的宽度 
    float progressposx = (int) (mrealwidth * radio); 
    //绘制的文本 
    string text = getprogress() + "%"; 
 
    //拿到字体的宽度和高度 
    float textwidth = mpaint.measuretext(text); 
    float textheight = (mpaint.descent() + mpaint.ascent()) / 2; 
 
    //如果到达最后，则未到达的进度条不需要绘制 
    if (progressposx + textwidth > mrealwidth) 
    { 
      progressposx = mrealwidth - textwidth; 
      noneedbg = true; 
    } 
 
    // 绘制已到达的进度 
    float endx = progressposx - mtextoffset / 2; 
    if (endx > 0) 
    { 
      mpaint.setcolor(mreachedbarcolor); 
      mpaint.setstrokewidth(mreachedprogressbarheight); 
      canvas.drawline(0, 0, endx, 0, mpaint); 
    } 
   
    // 绘制文本 
    if (mifdrawtext) 
    { 
      mpaint.setcolor(mtextcolor); 
      canvas.drawtext(text, progressposx, -textheight, mpaint); 
    } 
 
    // 绘制未到达的进度条 
    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：

/** 
 * 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()); 
 
} 

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 { 
  /** 
   * mradius of view 
   */ 
  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() + "%"; 
    // mpaint.gettextbounds(text, 0, text.length(), mtextbound); 
    float textwidth = mpaint.measuretext(text); 
    float textheight = (mpaint.descent() + mpaint.ascent()) / 2; 
 
    canvas.save(); 
    canvas.translate(getpaddingleft(), getpaddingtop()); 
    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~~~

三、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); 
 
  } 
 
}