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Android應用中炫酷的橫向和環(huán)形進度條的實例分享

 更新時間：2016年04月19日 17:03:28   作者：鴻洋_  
這篇文章主要介紹了Android應用中炫酷的橫向和圓形進度條的實例分享,文中利用了一些GitHub上的插件進行改寫,也是一片很好的二次開發(fā)教學,需要的朋友可以參考下

一、概述
最近需要用進度條，秉著不重復造輪子的原則，上github上搜索了一番，看了幾個覺得比較好看的ProgressBar，比如：daimajia的等。簡單看了下代碼，基本都是繼承自View，徹徹底底的自定義了一個進度條。盯著那絢麗滾動條，忽然覺得，為什么要通過View去寫一個滾動條，系統(tǒng)已經(jīng)提供了ProgressBar以及屬于它的特性，我們沒必要重新去構建一個，但是系統(tǒng)的又比較丑，不同版本變現(xiàn)還不一定一樣。那么得出我們的目標：改變系統(tǒng)ProgressBar的樣子。
對沒錯，我們沒有必要去從0打造一個ProgressBar，人家雖然長的不好看，但是特性以及穩(wěn)定性還是剛剛的，我們只需要為其整下容就ok了。
接下來，我們貼下效果圖：
1、橫向的進度條

2、圓形的進度條

2016419170129190.jpg (414×620)

沒錯，這就是我們的進度條效果，橫向的模仿了daimajia的進度條樣子。不過我們繼承子ProgressBar，簡單的為其整個容，代碼清晰易懂 。為什么說，易懂呢？
橫向那個進度條，大家會drawLine()和drawText()吧，那么通過getWidth()拿到控件的寬度，再通過getProgress()拿到進度，按比例控制繪制線的長短，字的位置還不是分分鐘的事。

二、實現(xiàn)
 橫向的滾動條繪制肯定需要一些屬性，比如已/未到達進度的顏色、寬度，文本的顏色、大小等。
 本來呢，我是想通過系統(tǒng)ProgressBar的progressDrawable，從里面提取一些屬性完成繪制需要的參數(shù)的。但是，最終呢，反而讓代碼變得復雜。所以最終還是改用自定義屬性。 說道自定義屬性，大家應該已經(jīng)不陌生了。
1、HorizontalProgressBarWithNumber
（1）自定義屬性
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）構造中獲取

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，看起來代碼挺長，其實都是在獲取自定義屬性，沒什么技術含量。

（3）onMeasure
剛才不是出onDraw里面寫寫就行了么，為什么要改onMeasure呢，主要是因為我們所有的屬性比如進度條寬度讓用戶自定義了，所以我們的測量也得稍微變下。

@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); 
 
}

寬度我們不變，所以的自定義屬性不涉及寬度，高度呢，只考慮不是EXACTLY的情況（用戶明確指定了，我們就不管了），根據(jù)padding和進度條寬度算出自己想要的，如果非EXACTLY下，我們進行exceptHeight封裝，傳入給控件進行測量高度。
測量完，就到我們的onDraw了~~~
（4）onDraw

@Override 
  protected synchronized void onDraw(Canvas canvas) 
  { 
    canvas.save(); 
    //畫筆平移到指定paddingLeft， getHeight() / 2位置，注意以后坐標都為以此為0，0 
    canvas.translate(getPaddingLeft(), getHeight() / 2); 
 
    boolean noNeedBg = false; 
    //當前進度和總值的比例 
    float radio = getProgress() * 1.0f / getMax(); 
    //已到達的寬度 
    float progressPosX = (int) (mRealWidth * radio); 
    //繪制的文本 
    String text = getProgress() + "%"; 
 
    //拿到字體的寬度和高度 
    float textWidth = mPaint.measureText(text); 
    float textHeight = (mPaint.descent() + mPaint.ascent()) / 2; 
 
    //如果到達最后，則未到達的進度條不需要繪制 
    if (progressPosX + textWidth > mRealWidth) 
    { 
      progressPosX = mRealWidth - textWidth; 
      noNeedBg = true; 
    } 
 
    // 繪制已到達的進度 
    float endX = progressPosX - mTextOffset / 2; 
    if (endX > 0) 
    { 
      mPaint.setColor(mReachedBarColor); 
      mPaint.setStrokeWidth(mReachedProgressBarHeight); 
      canvas.drawLine(0, 0, endX, 0, mPaint); 
    } 
   
    // 繪制文本 
    if (mIfDrawText) 
    { 
      mPaint.setColor(mTextColor); 
      canvas.drawText(text, progressPosX, -textHeight, mPaint); 
    } 
 
    // 繪制未到達的進度條 
    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(); 
 
  }

其實核心方法就是onDraw了，但是呢，onDraw也很簡單，繪制線、繪制文本、繪制線，結束。

還有兩個簡單的輔助方法：

/** 
 * 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，到此我們的橫向進度就結束了，是不是很簡單~~如果你是自定義View，你還得考慮progress的更新，考慮狀態(tài)的銷毀與恢復等等復雜的東西。
接下來看我們的RoundProgressBarWidthNumber圓形的進度條。

2、RoundProgressBarWidthNumber   
圓形的進度條和橫向的進度條基本變量都是一致的，于是我就讓RoundProgressBarWidthNumber extends HorizontalProgressBarWithNumber 了。
然后需要改變的就是測量和onDraw了：
完整代碼：

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(); 
 
  } 
 
}

首先獲取它的專有屬性mRadius，然后根據(jù)此屬性去測量，測量完成繪制；
繪制的過程呢？
先繪制一個細一點的圓，然后繪制一個粗一點的弧度，二者疊在一起就行。文本呢，繪制在中間~~~總體，沒什么代碼量。
好了，兩個進度條就到這了，是不是發(fā)現(xiàn)簡單很多?？傮w設計上，存在些問題，如果抽取一個BaseProgressBar用于獲取公共的屬性；然后不同樣子的進度條繼承分別實現(xiàn)自己的測量和樣子，這樣結構可能會清晰些~~~

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); 
 
  } 
 
}

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