<declare-styleable name="ButtonCircleProgressBar">
<!--无进度时的颜色-->
<attr name="progress_unreached_color" format="color" />
<!--进度颜色-->
<attr name="progress_reached_color" format="color" />
<!--进度条的高-->
<attr name="progress_reached_bar_height" format="dimension" />
<!--无进度时的边框高-->
<attr name="progress_unreached_bar_height" format="dimension" />
<!--圆的半径-->
<attr name="radius" format="dimension" />
</declare-styleable>

private static final int DEFAULT_TEXT_COLOR = 0XFFFC00D1;
private static final int DEFAULT_COLOR_UNREACHED_COLOR = 0xFFd3d6da;
private static final int DEFAULT_HEIGHT_REACHED_PROGRESS_BAR = 2;
private static final int DEFAULT_HEIGHT_UNREACHED_PROGRESS_BAR = 2;
/**
* The status of this view currently;
*/
private Status mStatus = Status.End;
/**
* painter of all drawing things
*/
protected Paint mPaint = new Paint();
/**
* height of reached progress bar
*/
protected int mReachedProgressBarHeight = dp2px(DEFAULT_HEIGHT_REACHED_PROGRESS_BAR);
/**
* color of reached bar
*/
protected int mReachedBarColor = DEFAULT_TEXT_COLOR;
/**
* color of unreached bar
*/
protected int mUnReachedBarColor = DEFAULT_COLOR_UNREACHED_COLOR;
/**
* height of unreached progress bar
*/
protected int mUnReachedProgressBarHeight = dp2px(DEFAULT_HEIGHT_UNREACHED_PROGRESS_BAR);
/**
* the length of triangle
*/
private int triangleLength;
/**
* use path to draw triangle
*/
private Path mPath;
/**
* mRadius of view
*/
private int mRadius = dp2px(30);
public ButtonCircleProgressBar(Context context) {
this(context,null);
}
public ButtonCircleProgressBar(Context context, AttributeSet attrs) {
this(context, attrs,0);
}
public ButtonCircleProgressBar(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
// init values from custom attributes
final TypedArray attributes = getContext().obtainStyledAttributes(
attrs, R.styleable.ButtonCircleProgressBar);
mReachedBarColor = attributes
.getColor(
R.styleable.ButtonCircleProgressBar_progress_reached_color,
Color.BLUE);
mUnReachedBarColor = attributes
.getColor(
R.styleable.ButtonCircleProgressBar_progress_unreached_color,
DEFAULT_COLOR_UNREACHED_COLOR);
mReachedProgressBarHeight = (int) attributes
.getDimension(
R.styleable.ButtonCircleProgressBar_progress_reached_bar_height,
mReachedProgressBarHeight);
mUnReachedProgressBarHeight = (int) attributes
.getDimension(
R.styleable.ButtonCircleProgressBar_progress_unreached_bar_height,
mUnReachedProgressBarHeight);
mRadius = (int) attributes.getDimension(
R.styleable.ButtonCircleProgressBar_radius, mRadius);
triangleLength = mRadius;
attributes.recycle();
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setAntiAlias(true);
mPaint.setDither(true);
mPaint.setStrokeCap(Paint.Cap.ROUND);
mPath = new Path();//need path to draw triangle
}
public Status getStatus() {
return mStatus;
}
public void setStatus(Status status) {
mStatus = status;
invalidate();
}
public enum Status{
End,
Starting
}

@Override
protected synchronized void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int heightMode = MeasureSpec.getMode(heightMeasureSpec);
int widthMode = MeasureSpec.getMode(widthMeasureSpec);
int paintWidth = Math.max(mReachedProgressBarHeight,
mUnReachedProgressBarHeight);
if (heightMode != MeasureSpec.EXACTLY) {
int exceptHeight = (int) (getPaddingTop() + getPaddingBottom()
+ mRadius * 2 + paintWidth);
heightMeasureSpec = MeasureSpec.makeMeasureSpec(exceptHeight,
MeasureSpec.EXACTLY);
}
if (widthMode != MeasureSpec.EXACTLY) {
int exceptWidth = (int) (getPaddingLeft() + getPaddingRight()
+ mRadius * 2 + paintWidth);
widthMeasureSpec = MeasureSpec.makeMeasureSpec(exceptWidth,
MeasureSpec.EXACTLY);
}
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}

@Override
protected synchronized void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.save();
canvas.translate(getPaddingLeft(), getPaddingTop());
mPaint.setStyle(Paint.Style.STROKE);
// draw unreaded bar
mPaint.setColor(mUnReachedBarColor);
mPaint.setStrokeWidth(mUnReachedProgressBarHeight);
canvas.drawCircle(mRadius, mRadius, mRadius, mPaint);
// draw reached bar
mPaint.setColor(mReachedBarColor);
mPaint.setStrokeWidth(mReachedProgressBarHeight);
float sweepAngle = getProgress() * 1.0f / getMax() * 360;
canvas.drawArc(new RectF(0, 0, mRadius * 2, mRadius * 2), 0,
sweepAngle, false, mPaint);

float leftX = (float) ((2*mRadius-Math.sqrt(3.0)/2*triangleLength)/2); 

public class ButtonCircleProgressBar extends ProgressBar {
.........
mPath = new Path();//need path to draw triangle
triangleLength = mRadius;
float leftX = (float) ((2*mRadius-Math.sqrt(3.0)/2*triangleLength)/2);
float realX = (float) (leftX+leftX*0.2);
mPath.moveTo(realX,mRadius-(triangleLength/2));
mPath.lineTo(realX,mRadius+(triangleLength/2));
mPath.lineTo((float) (realX+Math.sqrt(3.0)/2*triangleLength),mRadius);
mPath.lineTo(realX,mRadius-(triangleLength/2));
}

@Override
protected synchronized void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.save();
canvas.translate(getPaddingLeft(), getPaddingTop());
....
if (mStatus==Status.End){//未开始状态，画笔填充
mPaint.setStyle(Paint.Style.FILL);
canvas.drawPath(mPath,mPaint);//直接drawPath
}else{
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setStrokeWidth(dp2px(5));
canvas.drawLine(mRadius*2/3,mRadius*2/3,mRadius*2/3,2*mRadius*2/3,mPaint);
canvas.drawLine(2*mRadius-(mRadius*2/3),mRadius*2/3,2*mRadius-(mRadius*2/3),2*mRadius*2/3,mPaint);
}
canvas.restore();
}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.qiangyu.test.buttoncircleprogress.MainActivity">
<com.qiangyu.test.buttoncircleprogress.view.ButtonCircleProgressBar
android:id="@+id/progressBar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="50dip"
android:padding="5dp"
android:progress="30" />
</RelativeLayout>

public class MainActivity extends AppCompatActivity {
private ButtonCircleProgressBar mProgressBar;
private static final int MSG_PROGRESS_UPDATE = 0x110;
private int progress;
private Handler mHandler = new Handler() {
public void handleMessage(android.os.Message msg) {
progress = mProgressBar.getProgress();
mProgressBar.setProgress(++progress);
if (progress >= 100) {
mHandler.removeMessages(MSG_PROGRESS_UPDATE);
progress = 0;
mProgressBar.setStatus(ButtonCircleProgressBar.Status.End);
mProgressBar.setProgress(0);
}else{
mHandler.sendEmptyMessageDelayed(MSG_PROGRESS_UPDATE, 100);
}
};
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mProgressBar = (ButtonCircleProgressBar) findViewById(R.id.progressBar);
mProgressBar.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (mProgressBar.getStatus()== ButtonCircleProgressBar.Status.Starting){
mProgressBar.setStatus(ButtonCircleProgressBar.Status.End);
mHandler.removeMessages(MSG_PROGRESS_UPDATE);
}else{
mHandler.sendEmptyMessage(MSG_PROGRESS_UPDATE);
mProgressBar.setStatus(ButtonCircleProgressBar.Status.Starting);
}
}
});
}
}