自定义View实现Android圆形进度条，支持自定义显示的样式

        我是完全根据这里仿制了一个作为备忘，可以点击这里查看原始版本

代码如下：

1、res/values/attrs.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <declare-styleable name="RoundProgressBar">
        <attr name="roundColor" format="color" />
        <attr name="roundProgressColor" format="color" />
        <attr name="roundWidth" format="dimension"></attr>
        <attr name="textColor" format="color" />
        <attr name="textSize" format="dimension" />
        <attr name="max" format="integer"></attr>
        <attr name="textIsDisplayable" format="boolean"></attr>
        <attr name="style">
            <enum name="STROKE" value="0"></enum>
            <enum name="FILL" value="1"></enum>
        </attr>
    </declare-styleable>

</resources>

2、具体实现

public class RoundProgressBar extends View {
	private Paint mPaint;
	private int mRoundColor;
	private int mProgressColor;
	private int mTextColor;
	private int mTextSize;
	private float mRounWidth;
	private int mMaxProgress;
	private int mCurrentProgress = 45;
	private boolean mTextIsDisplayable;
	private int mStyle = 1;
	private static final int STROKE = 0;
	private static final int FILL =1;
	
	public RoundProgressBar(Context context) {
		this(context, null);
	}

	public RoundProgressBar(Context context, AttributeSet attrs) {
		this(context, attrs, 0);
	}

	public RoundProgressBar(Context context, AttributeSet attrs,
			int defStyleAttr) {
		super(context, attrs, defStyleAttr);
		mPaint = new Paint();
		TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.RoundProgressBar);
		mRoundColor = typedArray.getColor(R.styleable.RoundProgressBar_roundColor, Color.RED);
		mProgressColor = typedArray.getColor(R.styleable.RoundProgressBar_roundProgressColor, Color.GREEN);
		mTextColor = typedArray.getColor(R.styleable.RoundProgressBar_textColor, Color.BLUE);
		mTextSize = typedArray.getDimensionPixelSize(R.styleable.RoundProgressBar_textSize, 15);
		mRounWidth = typedArray.getDimensionPixelSize(R.styleable.RoundProgressBar_roundWidth, 5);
		mMaxProgress = typedArray.getInt(R.styleable.RoundProgressBar_max, 100);
		mTextIsDisplayable = typedArray.getBoolean(R.styleable.RoundProgressBar_textIsDisplayable, true);
		mStyle = typedArray.getInt(R.styleable.RoundProgressBar_style, STROKE);
		typedArray.recycle();
	}
	
	@Override
	protected void onDraw(Canvas canvas) {
		super.onDraw(canvas);
		// Draw outer circle
		int center = getWidth() / 2;
		int radius = (int) (center - mRounWidth / 2);
		mPaint.setColor(mRoundColor);
		mPaint.setStyle(Paint.Style.STROKE);
		mPaint.setStrokeWidth(mRounWidth);
		mPaint.setAntiAlias(true);
		canvas.drawCircle(center, center, radius, mPaint);
		
		// Draw progress
		mPaint.setStrokeWidth(mRounWidth);
		mPaint.setColor(mProgressColor);
		RectF oval = new RectF(center - radius, center - radius,
				center + radius, center + radius);
		switch (mStyle) {
		case STROKE:
			mPaint.setStyle(Paint.Style.STROKE);
			canvas.drawArc(oval, 0, 360 * mCurrentProgress / mMaxProgress, false, mPaint);
			break;
			
		case FILL:
			mPaint.setStyle(Paint.Style.FILL_AND_STROKE);
			if (mCurrentProgress != 0) {
				canvas.drawArc(oval, 0, 360 * mCurrentProgress / mMaxProgress, true, mPaint);
			}
			
			break;

		default:
			break;
		}
		
		mPaint.setStrokeWidth(0);
		mPaint.setColor(mTextColor);
		mPaint.setTextSize(mTextSize);
		mPaint.setTypeface(Typeface.DEFAULT);
		int percent = (int) (((float) mCurrentProgress / (float) mMaxProgress) * 100);
		float textWidth = mPaint.measureText(percent + "%");
		if (percent != 0 && mTextIsDisplayable) {
			canvas.drawText(percent + "%", center - textWidth / 2, center + mTextSize / 2, mPaint);
		}
	}

	public int getRoundColor() {
		return mRoundColor;
	}

	public void setRoundColor(int roundColor) {
		this.mRoundColor = roundColor;
	}

	public int getProgressColor() {
		return mProgressColor;
	}

	public void setProgressColor(int progressColor) {
		this.mProgressColor = progressColor;
	}

	public int getTextColor() {
		return mTextColor;
	}

	public void setTextColor(int textColor) {
		this.mTextColor = textColor;
	}

	public int getTextSize() {
		return mTextSize;
	}

	public void setTextSize(int textSize) {
		this.mTextSize = textSize;
	}

	public float getRounWidth() {
		return mRounWidth;
	}

	public void setmRounWidth(float mRounWidth) {
		this.mRounWidth = mRounWidth;
	}

	public synchronized int getMaxProgress() {
		return mMaxProgress;
	}

	public synchronized void setMaxProgress(int maxProgress) {
		if (maxProgress < 0) {
			throw new IllegalArgumentException("Max Progress not less than 0");
		} 
		this.mMaxProgress = maxProgress;
	}

	public synchronized int getCurrentProgress() {
		return mCurrentProgress;
	}

	public synchronized void setCurrentProgress(int currentProgress) {
		if (currentProgress < 0) {
			throw new IllegalArgumentException("Progress not less than 0");
		}
		if (currentProgress > mMaxProgress) {
			currentProgress = mMaxProgress;
		}
		if (currentProgress <= mMaxProgress) {
			this.mCurrentProgress = currentProgress;
			postInvalidate();
		}
	}

	public boolean isTextIsDisplayable() {
		return mTextIsDisplayable;
	}

	public void setTextDisplayable(boolean displayable) {
		this.mTextIsDisplayable = displayable;
	}

	public int getStyle() {
		return mStyle;
	}

	public void setStyle(int style) {
		this.mStyle = style;
	}
	
}

3、布局文件中使用

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:android_custom="http://schemas.android.com/apk/res/com.example.demo"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.gaussianblur.MainActivity" >

    <com.example.demo.RoundProgressBar
        android:id="@+id/roundProgressBar"
        android:layout_width="80dip"
        android:layout_height="80dip"
        android:layout_marginBottom="78dp"
        android:layout_gravity="center"
        android_custom:roundColor="#D1D1D1"
        android_custom:roundProgressColor="@android:color/holo_orange_dark"
        android_custom:roundWidth="4dip"
        android_custom:textColor="#9A32CD"
        android_custom:textIsDisplayable="true"
        android_custom:textSize="18sp" />


</FrameLayout>

4、效果图