安卓中制作横向和圆形进度条 Android应用中炫酷的横向和环形进度条的实例分享

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安卓中制作横向和圆形进度条 Android应用中炫酷的横向和环形进度条的实例分享

鸿洋_   2021-03-22 我要评论
想了解Android应用中炫酷的横向和环形进度条的实例讲解的相关内容吗,鸿洋_在本文为您仔细讲解安卓中制作横向和圆形进度条的相关知识和一些Code实例,欢迎阅读和指正,我们先划重点:Android,进度条,ProgressBar,安卓,下面大家一起来学习吧。

一、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。
接下来,我们贴下效果图:
1、横向的进度条

2、圆形的进度条

2016419170129190.jpg (414×620)

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); 
 
  } 
 
} 

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