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()); }}