Android实现简洁的APP更新dialog数字进度条

public class NumberProgressBar extends View {


 /**
  * 右侧未完成进度条的颜色
  */
 private int paintStartColor = 0xffe5e5e5;

 /**
  * Contxt
  */
 private Context context;

 /**
  * 主线程传过来进程 0 - 100
  */
 private int progress;

 /**
  * 得到自定义视图的宽度
  */
 private int viewWidth;


 private RectF pieOval;

 private RectF pieOvalIn;

 /**
  * 得到自定义视图的Y轴中心点
  */
 private int viewCenterY;

 /**
  * 已完成的画笔
  */
 private Paint paintInit = new Paint();


 /**
  * 未完成进度条画笔的属性
  */
 private Paint paintStart = new Paint();

 /**
  * 大圆的画笔
  */
 private Paint paintEndBig = new Paint();

 /**
  * 小圆的画笔
  */
 private Paint paintSmall = new Paint();


 /**
  * 画中间的百分比文字的画笔
  */
 private Paint paintText = new Paint();

 /**
  * 要画的文字的宽度
  */
 private int textWidth;

 /**
  * 画文字时底部的坐标
  */
 private float textBottomY;

 private int smallR;//小圆的半径
 private int bigR;//大圆半径
 private float radius;
 private int jR;//气泡矩形

 /**
  * 文字总共移动的长度（即从0%到100%文字左侧移动的长度）
  */
// private int totalMovedLength;
 public NumberProgressBar(Context context, AttributeSet attrs) {
  super(context, attrs);
  this.context = context;
  // 构造器中初始化数据
  smallR = dip2px(context, 4);//小圆半径
  bigR = dip2px(context, 8);//大圆半径
  radius = dip2px(context, 10) / 2;//进度条高度
  jR = dip2px(context, 6);//矩形

  initData();
 }

 /**
  * 初始化数据
  */
 private void initData() {

  // 未完成进度条画笔的属性
  paintStart.setColor(paintStartColor);
  paintStart.setStrokeWidth(dip2px(context, 1));
  paintStart.setDither(true);
  paintStart.setAntiAlias(true);
  paintStart.setStyle(Paint.Style.FILL);

  // 已完成进度条画笔的属性
  paintInit.setColor(context.getResources().getColor(R.color.blue));
  paintInit.setStrokeWidth(dip2px(context, 1));
  paintInit.setAntiAlias(true);
  paintInit.setDither(true);
  paintInit.setStyle(Paint.Style.FILL);


  // 小圆画笔
  paintSmall.setColor(Color.WHITE);
  paintSmall.setAntiAlias(true);
  paintSmall.setStyle(Paint.Style.FILL);

  // 大圆画笔
  paintEndBig.setColor(context.getResources().getColor(R.color.blue));
  paintEndBig.setAntiAlias(true);
  paintEndBig.setStyle(Paint.Style.FILL);


  // 百分比文字画笔的属性
  int paintTextSizePx = sp2px(context, 11); //设置百分比文字的尺寸
  paintText.setColor(context.getResources().getColor(R.color.blue));
  paintText.setTextSize(paintTextSizePx);
  paintText.setAntiAlias(true);
  paintText.setTypeface(Typeface.DEFAULT_BOLD);

 }

 @Override
 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
  super.onMeasure(widthMeasureSpec, heightMeasureSpec);
 }


 @Override
 protected void onDraw(Canvas canvas) {
  super.onDraw(canvas);

  //得到float型进度
  float progressFloat = progress / 100.0f;
  int viewHeight = getMeasuredHeight();//得到控件的高度

  viewWidth = getMeasuredWidth() - 4 * jR;

  viewCenterY = viewHeight - bigR;

  float currentMovedLen = viewWidth * progressFloat + 2 * jR;

  String str = progress + "%";

  Rect bounds = new Rect();
  paintText.getTextBounds(str, 0, str.length(), bounds);
  textWidth = bounds.width();
  textBottomY = bounds.height();
/**
 * 1：绘画的文本
 * 2.距离x的位移
 * 3.距离Y的位移
 * 4.画笔对象
 */
  canvas.drawText(str, currentMovedLen - textWidth / 2,
    viewCenterY - smallR / 2 - bigR / 2 - 2 * jR + textBottomY / 2,
    paintText);//文字


  //圆角矩形初始的
  canvas.drawRoundRect(new RectF(2 * jR, viewCenterY - radius, currentMovedLen,
      viewCenterY + radius),
    radius, radius, paintInit);

  //圆角矩形--进行中
  canvas.drawRoundRect(new RectF(currentMovedLen, viewCenterY - radius, viewWidth + 2 * jR,
    viewCenterY + radius), radius, radius, paintStart);

  pieOval = new RectF(currentMovedLen - bigR, viewCenterY - bigR, currentMovedLen + bigR, viewCenterY + bigR);

  pieOvalIn = new RectF(currentMovedLen - smallR, viewCenterY - smallR, currentMovedLen + smallR, viewCenterY + smallR);

  //大圆
  canvas.drawArc(pieOval, 0, 360, true, paintEndBig);

  //小圆
  canvas.drawArc(pieOvalIn, 0, 360, true, paintSmall);
 }

 /**
  * @param progress 外部传进来的当前进度
  */
 public void setProgress(int progress) {
  this.progress = progress;
  invalidate();
 }

 public static int dip2px(Context ctx, float dp) {
  float density = ctx.getResources().getDisplayMetrics().density;
  int px = (int) (dp * density + 0.5f);
  return px;
 }

 public static int sp2px(Context context, float spValue) {
  return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, spValue, context.getResources().getDisplayMetrics());
 }
}