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;/** * 自定義帶圓點的進度條 */public class HalfProgressBar extends View{ private int maxProgress = 100; //設置進度條背景寬度 private float progressStrokeWidth = 3; //設置進度條進度寬度 private float marxArcStorkeWidth = 6; //設置進度條圓點的寬度 private float circularDotWidth=15; /**  * 畫筆對象的引用  */ private Paint paint; public synchronized int getProgress() {  return progress; } /**  * Android提供了Invalidate方法實現界面刷新，但是Invalidate不能直接在線程中調用，因為他是違背了單線程模型：Android UI操作并不是線程安全的，并且這些操作必須在UI線程中調用。  * 而postInvalidate()在工作者線程中被調用 使用postInvalidate則比較簡單，不需要handler，直接在線程中調用postInvalidate即可。   * @param progress 傳過來的進度  */ public void setProgress(int progress) {  if (progress < 0) {   progress = 0;  }  if (progress > maxProgress) {   progress = maxProgress;  }  if (progress <= maxProgress) {   this.progress = progress;   postInvalidate();  } } /**  * 當前進度  */ 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();  //這是自定義view 必須要寫的  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 自動生成的方法存根  super.onDraw(canvas);  float width = getWidth();  float height = getHeight();  paint.setAntiAlias(false); // 設置畫筆為抗鋸齒  paint.setColor(roundColor); // 設置畫筆顏色  paint.setStrokeWidth(progressStrokeWidth); // 線寬  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);//半徑  //調整圓背景的大小  canvas.drawArc(oval, 180, 180, false, paint); // 繪制紅絲圓圈，即進度條背景  //進度條顏色  paint.setColor(roundProgressColor);  paint.setStrokeWidth(marxArcStorkeWidth);  canvas.drawArc(oval, 180, 180 * ((float) progress / (float) maxProgress), false, paint); // 繪制進度圓弧，這里是藍色  //畫圓點  paint.setColor(circularDotColor);  paint.setAntiAlias(true); // 設置畫筆為抗鋸齒  paint.setStyle(Paint.Style.FILL);  paint.setStrokeWidth(circularDotWidth);  //當畫筆樣式為STROKE或FILL_OR_STROKE時，設置筆刷的圖形樣式，如圓形樣式Cap.ROUND,或方形樣式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 ? 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> <!--自定義半圓形加載進度條--> <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"/>