android自定义view制作圆形进度条效果

还是我们自定View的那几个步骤：
1、自定义View的属性
2、在View的构造方法中获得我们自定义的属性
[ 3、重写onMesure ]
4、重写onDraw

1、自定义属性：

2、在View的构造方法中获得我们自定义的属性

 
 private int mProgress; 
  
 private int mFirstColor; 
  
 private int mSecondColor; 
  
 private int mCircleWidth; 
  
 private int mSpeed; 
  
 private float textSize; 
 private boolean isNext = false; 
 private Paint mPaint; 
 
 public CustomTitleView(Context context, AttributeSet attrs) { 
  super(context, attrs); 
  TypedArray typearray = context.obtainStyledAttributes(attrs, R.styleable.CustomTitleView); 
  int count= typearray.getIndexCount(); 
  for(int i=0;i

3、直接重写onDraw，这不需要重写onMeasure



protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec){ 
    super.onMeasure(widthMeasureSpec, heightMeasureSpec); 
 } 
 protected void onDraw(Canvas canvas) 
 { 
   
  mPaint.setStrokeWidth(0); 
  mPaint.setColor(Color.BLACK); 
  mPaint.setTextSize(textSize); 
  mPaint.setTypeface(Typeface.DEFAULT_BOLD); //设置字体 
  int percent = (int)(((float)mProgress / (float)360) * 100); 
  int centre = getWidth() / 2; // 获取圆心的x坐标 
  int radius = centre - mCircleWidth / 2;// 半径 
  float textWidth = mPaint.measureText(percent + "%"); //测量字体宽度，我们需要根据字体的宽度设置在圆环中间 
  canvas.drawText(percent + "%",centre-textWidth/ 2,centre+textSize/2, mPaint); //画出进度百分比 
  mPaint.setStrokeWidth(mCircleWidth); // 设置圆环的宽度 
  mPaint.setAntiAlias(true); // 消除锯齿 
  mPaint.setStyle(Paint.Style.STROKE); // 设置空心 
  RectF oval = new RectF(centre - radius, centre - radius, centre + radius, centre + radius); // 用于定义的圆弧的形状和大小的界限 
  if(isNext){ 
   mPaint.setColor(mSecondColor); // 设置圆环的颜色 
   canvas.drawCircle(centre, centre, radius, mPaint); // 画出圆环 
   mPaint.setColor(mFirstColor); // 设置圆环的颜色 
   canvas.drawArc(oval, -90, mProgress, false, mPaint); // 根据进度画圆弧 
  }else{ 
   mPaint.setColor(mFirstColor); // 设置圆环的颜色 
   canvas.drawCircle(centre, centre, radius, mPaint); // 画出圆环 
   mPaint.setColor(mSecondColor); // 设置圆环的颜色 
   canvas.drawArc(oval, -90, mProgress, false, mPaint); // 根据进度画圆弧 
  } 
 } 


activity_main.xml



 
 
  
  
 

效果预览

源码下载：http://xiazai.jb51.net/201701/yuanma/AndroidProgressbar(jb51.net).rar
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