自定义圆环进度显示

/**

• Created by shkstart on 2016/12/3 0003.

• 自定义视图
  */
  public class RoundProgress extends View {

  //使用自定义属性来初始化如下的变量
  private int roundColor;//圆环的颜色
  private int roundProgressColor ;//圆弧的颜色
  private int textColor;//文本的颜色

  private float roundWidth ;//圆环的宽度
  private float textSize ;//文本的字体大小

  private int max;//圆环的最大值
  private int progress;//圆环的进度

  private int width;//当前视图的宽度（=高度）

  private Paint paint;//画笔

  public RoundProgress(Context context) {
  this(context, null);
  }

  public RoundProgress(Context context, AttributeSet attrs) {
  this(context, attrs, 0);
  }

  public RoundProgress(Context context, AttributeSet attrs, int defStyleAttr) {
  super(context, attrs, defStyleAttr);

   //初始化画笔
   paint = new Paint();
   paint.setAntiAlias(true);//去除毛边
  
   //获取自定义的属性
   //1.获取TypeArray的对象(调用两个参数的方法）
   TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.RoundProgress);
  
   //2.取出所有的自定义属性
   roundColor = typedArray.getColor(R.styleable.RoundProgress_roundColor, Color.GRAY);
   roundProgressColor = typedArray.getColor(R.styleable.RoundProgress_roundProgressColor,Color.RED);
   textColor = typedArray.getColor(R.styleable.RoundProgress_textColor,Color.GREEN);
   roundWidth = typedArray.getDimension(R.styleable.RoundProgress_roundWith,UIUtils.dp2px(10));
   textSize = typedArray.getDimension(R.styleable.RoundProgress_textSize,UIUtils.dp2px(20));
   max = typedArray.getInteger(R.styleable.RoundProgress_max,100);
   progress = typedArray.getInteger(R.styleable.RoundProgress_progress,30);
  
   //3.回收处理
   typedArray.recycle();
  

  }

  public int getMax() {
  return max;
  }

  public void setMax(int max) {
  this.max = max;
  }

  public int getProgress() {
  return progress;
  }

  public void setProgress(int progress) {
  this.progress = progress;
  }

  //测量：获取当前视图宽高
  @Override
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
  super.onMeasure(widthMeasureSpec, heightMeasureSpec);
  width = this.getMeasuredWidth();
  }

  //canvas:画布，对应着视图在布局中的范围区间。范围的左上顶点即为坐标原点
  @Override
  protected void onDraw(Canvas canvas) {
  //1.绘制圆环
  //获取圆心坐标
  int cx = width / 2;
  int cy = width / 2;
  float radius = width / 2 - roundWidth / 2;
  paint.setColor(roundColor);//设置画笔颜色
  paint.setStyle(Paint.Style.STROKE);//设置圆环的样式
  paint.setStrokeWidth(roundWidth);//设置圆环的宽度
  canvas.drawCircle(cx, cy, radius, paint);

   //2.绘制圆弧
   RectF rectF = new RectF(roundWidth / 2, roundWidth / 2, width - roundWidth / 2, width - roundWidth / 2);
   paint.setColor(roundProgressColor);//设置画笔颜色
   canvas.drawArc(rectF,0,progress * 360 / max ,false,paint);
  
   //3.绘制文本
   String text = progress * 100 / max  + "%";
   //设置paint
   paint.setColor(textColor);
   paint.setTextSize(textSize);
   paint.setStrokeWidth(0);
   Rect rect = new Rect();//创建了一个矩形，此时矩形没有具体的宽度和高度
   paint.getTextBounds(text,0,text.length(),rect);//此时的矩形的宽度和高度即为整好包裹文本的矩形的宽高
   //获取左下顶点的坐标
   int x = width / 2 - rect.width() / 2;
   int y = width / 2 + rect.height() / 2;
  
  
   canvas.drawText(text,x,y,paint);
  

  }
  }

我们的style自定义属性里：