Android自定义带圆点的半圆形进度条

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 ? 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"/>