Android实现环形进度条的效果图如下：
自定义控件：AttendanceProgressBar
代码如下：
public class AttendanceProgressBar extends View { // 画圆环底部的画笔 private Paint mCirclePaint; // 画圆环的画笔 private Paint mRingPaint; // 画字体的画笔 private Paint mTextPaint; // 圆形颜色 private int mCircleColor; // 圆环颜色 private int mRingColor; // 半径 private float mRadius; // 圆环半径 private float mRingRadius; // 圆环宽度 private float mStrokeWidth; // 圆心x坐标 private int mXCenter; // 圆心y坐标 private int mYCenter; // 字的长度 private float mTxtWidth; // 字的高度 private float mTxtHeight; // 总进度 private int mTotalProgress = 100; // 当前进度 private int mProgress = 80; //字体颜色 private int mTextColor; // 字体大小 private float mTextSize; public AttendanceProgressBar(Context context, AttributeSet attrs) { super(context, attrs); // 获取自定义的属性 initAttrs(context, attrs); initVariable(); } private void initAttrs(Context context, AttributeSet attrs) { TypedArray typeArray = context.getTheme().obtainStyledAttributes(attrs, R.styleable.AttendanceProgressBar, 0, 0); mRadius = typeArray.getDimension(R.styleable.AttendanceProgressBar_radius, 80); mStrokeWidth = typeArray.getDimension(R.styleable.AttendanceProgressBar_strokeWidth, 10); mCircleColor = typeArray.getColor(R.styleable.AttendanceProgressBar_circleColor, 0xFFFFFFFF); mRingColor = typeArray.getColor(R.styleable.AttendanceProgressBar_ringColor, 0xFFFFFFFF); mTextColor = typeArray.getColor(R.styleable.AttendanceProgressBar_textColor, 0xFF000000); mTextSize = typeArray.getDimension(R.styleable.AttendanceProgressBar_textSize, 80); mRingRadius = mRadius + mStrokeWidth / 2; } private void initVariable() { mCirclePaint = new Paint(); mCirclePaint.setAntiAlias(true); mCirclePaint.setColor(mCircleColor); // mCirclePaint.setStyle(Paint.Style.FILL); mCirclePaint.setStyle(Paint.Style.STROKE); mCirclePaint.setStrokeWidth(mStrokeWidth); mRingPaint = new Paint(); mRingPaint.setAntiAlias(true); mRingPaint.setColor(mRingColor); mRingPaint.setStyle(Paint.Style.STROKE); mRingPaint.setStrokeWidth(mStrokeWidth); mTextPaint = new Paint(); mTextPaint.setAntiAlias(true); mTextPaint.setStyle(Paint.Style.FILL); mTextPaint.setColor(mTextColor); // mTextPaint.setARGB(255, 255, 255, 255); // mTextPaint.setTextSize(mRadius / 2); mTextPaint.setTextSize(mTextSize); Paint.FontMetrics fm = mTextPaint.getFontMetrics(); mTxtHeight = (int) Math.ceil(fm.descent - fm.ascent); } @Override protected void onDraw(Canvas canvas) { mXCenter = getWidth() / 2; mYCenter = getHeight() / 2; // canvas.drawCircle(mXCenter, mYCenter, mRadius, mCirclePaint); canvas.drawCircle(mXCenter, mYCenter, mRingRadius, mCirclePaint); RectF oval = new RectF(); oval.left = (mXCenter - mRingRadius); oval.top = (mYCenter - mRingRadius); oval.right = mRingRadius * 2 + (mXCenter - mRingRadius); oval.bottom = mRingRadius * 2 + (mYCenter - mRingRadius); canvas.drawArc(oval, -90, ((float) mProgress / mTotalProgress) * 360, false, mRingPaint); // // canvas.drawCircle(mXCenter, mYCenter, mRadius + mStrokeWidth / 2, mRingPaint); // String txt = mProgress + "%"; String txt = "16/18"; mTxtWidth = mTextPaint.measureText(txt, 0, txt.length()); // canvas.drawText(txt, mXCenter - mTxtWidth / 2, mYCenter + mTxtHeight / 4, mTextPaint); canvas.drawText(txt, mXCenter - mTxtWidth / 2, mYCenter + mTxtHeight / 4 - dipToPx(10), mTextPaint); txt = "出勤人数"; mTxtWidth = mTextPaint.measureText(txt, 0, txt.length()); canvas.drawText(txt, mXCenter - mTxtWidth / 2, mYCenter + mTxtHeight / 4 + dipToPx(10), mTextPaint); } public void setProgress(int progress) { mProgress = progress; postInvalidate(); } private int dipToPx(int dip) { float scale = getContext().getResources().getDisplayMetrics().density; return (int) (dip * scale + 0.5f * (dip >= 0 ? 1 : -1)); } }
因为是自定义控件，所以在attr.xml文件定义了一些控件属性，以便在xml文件中设置这些属性
代码如下：
<?xml version="1.0" encoding="utf-8"?> <resources> <declare-styleable name="AttendanceProgressBar"> <attr name="radius" format="dimension"/> <attr name="strokeWidth" format="dimension"/> <attr name="circleColor" format="color"/> <attr name="ringColor" format="color"/> <attr name="textColor" format="color"/> <attr name="textSize" format="dimension"/> </declare-styleable> </resources>
最后，在xml文件中，可以这样使用
<com.ztd.lieyi.widget.AttendanceProgressBar android:layout_gravity="center" android:layout_width="100dp" android:layout_height="100dp" app:radius="45dp" app:strokeWidth="5dp" app:textSize="@dimen/text_16" app:textColor="@color/color_333333" app:circleColor="@color/color_d5ebfd" app:ringColor="@color/color_2c9df7"/>
这只是初步处理，使用时可以根据需求酌情处理~如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对脚本之家网站的支持！