import android.content.Context; import android.content.res.TyPEdArray; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.RectF; import android.util.AttributeSet; import android.view.View;  /**  * 自定义带圆点的进度条  */ public class HalfPRogressBar extends View{  private int maxprogress = 100;  //设置进度条背景宽度  private float progressstrokeWidth = 3;  //设置进度条进度宽度  private float marxArcStorkeWidth = 6;  //设置进度条圆点的宽度  private float circularDotWidth=15;    /**   * 画笔对象的引用   */  private Paint paint;   public synchronized int getProgress() {   return progress;  }   /**   * Android提供了Invalidate方法实现界面刷新，但是Invalidate不能直接在线程中调用，因为他是违背了单线程模型：Android UI操作并不是线程安全的，并且这些操作必须在UI线程中调用。   * 而postInvalidate()在工作者线程中被调用 使用postInvalidate则比较简单，不需要handler，直接在线程中调用postInvalidate即可。    * @param progress 传过来的进度   */  public void setProgress(int progress) {   if (progress < 0) {    progress = 0;   }   if (progress > maxProgress) {    progress = maxProgress;   }   if (progress <= maxProgress) {    this.progress = progress;    postInvalidate();   }  }  /**   * 当前进度   */  private int progress = 99;   private RectF oval;  private int roundProgressColor;  private int roundColor;  private int circularDotColor;  public HalfProgressBar(Context context) {   super(context);  }   public HalfProgressBar(Context context, AttributeSet attrs) {   super(context, attrs);   paint = new Paint();   oval = new RectF();   //这是自定义view 必须要写的   TypedArray mTypedArray = context.oBTainStyledAttributes(attrs, R.styleable.HalfProgressBar);   roundProgressColor = mTypedArray.getColor(R.styleable.HalfProgressBar_roundProgressColor1, Color.YELLOW);   roundColor=mTypedArray.getColor(R.styleable.HalfProgressBar_roundColor1, Color.YELLOW);   circularDotColor=mTypedArray.getColor(R.styleable.HalfProgressBar_circularDotColor1, Color.YELLOW);   }   public HalfProgressBar(Context context, AttributeSet attrs, int defStyleAttr) {   super(context, attrs, defStyleAttr);   paint = new Paint();   oval = new RectF();   TypedArray mTypedArray = context.obtainStyledAttributes(attrs, R.styleable.HalfProgressBar);   roundProgressColor = mTypedArray.getColor(R.styleable.HalfProgressBar_roundProgressColor1, Color.YELLOW);   roundColor=mTypedArray.getColor(R.styleable.HalfProgressBar_roundColor1, Color.YELLOW);   }   @override  protected void onDraw(Canvas canvas) {   // TODO 自动生成的方法存根   super.onDraw(canvas);   float width = getWidth();   float height = getHeight();   paint.setAntiAlias(false); // 设置画笔为抗锯齿   paint.setColor(roundColor); // 设置画笔颜色    paint.setStrokeWidth(progressStrokeWidth); // 线宽   paint.setStyle(Paint.Style.STROKE);    oval.left = marxArcStorkeWidth / 2; // 左上角x   oval.top = circularDotWidth; // 左上角y   oval.right = width - circularDotWidth / 2; // 左下角x   oval.bottom = width - circularDotWidth / 2; // 右下角y   float bangjing = ((width - circularDotWidth/2) / 2);//半径     //调整圆背景的大小   canvas.drawArc(oval, 180, 180, false, paint); // 绘制红丝圆圈，即进度条背景   //进度条颜色   paint.setColor(roundProgressColor);   paint.setStrokeWidth(marxArcStorkeWidth);   canvas.drawArc(oval, 180, 180 * ((float) progress / (float) maxProgress), false, paint); // 绘制进度圆弧，这里是蓝色     //画圆点   paint.setColor(circularDotColor);   paint.setAntiAlias(true); // 设置画笔为抗锯齿   paint.setStyle(Paint.Style.FILL);   paint.setStrokeWidth(circularDotWidth);   //当画笔样式为STROKE或FILL_OR_STROKE时，设置笔刷的图形样式，如圆形样式Cap.ROUND,或方形样式Cap.SQUARE   paint.setStrokeCap(Paint.Cap.ROUND);   float jindu = ((float) progress * 1.8f);   canvas.drawPoint(bangjing - ((float) (Math.sin((Math.PI / (double) 180) * (jindu <= 90 &#63; 90 - (jindu) : -jindu + 90))) * bangjing),    bangjing+circularDotWidth - ((float) (Math.cos((Math.PI / (double) 180) * (double) (jindu <= 90 ? 90 - jindu : -jindu + 90))) * bangjing), paint);   }  }

 <?xML version="1.0" encoding="utf-8"?> <resources>  <!--自定义半圆形加载进度条-->  <declare-styleable name="HalfProgressBar">   <attr name="roundColor1" format="color"/>   <attr name="roundProgressColor1" format="color"/>   <attr name="circularDotColor1" format="color"/>  </declare-styleable> </resources>

 <com.jyc99.demo.HalfProgressBar   android:layout_width="match_parent"   android:layout_height="wrap_content"   android:id="@+id/view"   android:layout_centerHorizontal="true"   android:layout_marginTop="42dp"   android_custom:roundColor1="#fc422b"   android_custom:roundProgressColor1="#fa432e"   android_custom:circularDotColor1="#246223"/>