Android实现简洁的APP更新dialog数字进度条

前言：现在一般的Android软件都是需要不断更新的，当你打开某个app的时候，如果有新的版本，它会提示你有新版本需要更新。当有更新时，会弹出一个提示框，点击下载，则在通知来创建一个数字进度条进行下载，下载成功后才到安装界面。

效果： 

 

开发环境：AndroidStudio2.2.1+gradle-2.14.1

涉及知识：

　　　　1.Handler机制 

　　　　2.自定义控件+canvas绘画 

　　　　3.自定义dialog 

部分代码： 

public class NumberProgressBar extends View {
 
 private int paintStartColor = 0xffe5e5e5;
 
 private Context context;
 
 private int progress;
 
 private int viewWidth;
 private RectF pieOval;
 private RectF pieOvalIn;
 
 private int viewCenterY;
 
 private Paint paintInit = new Paint();
 
 private Paint paintStart = new Paint();
 
 private Paint paintEndBig = new Paint();
 
 private Paint paintSmall = new Paint();
 
 private Paint paintText = new Paint();
 
 private int textWidth;
 
 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
 
// 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();
 }
 
 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();

  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);
 }
 
 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());
 }
}

源码下载：dialog数字进度条

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