Android|自定义漂亮的圆形进度条 Android开发|UI魔术手

文章图片

代码：

package com.snailws.taskscompleted.activity; import android.content.Context; import android.content.res.TypedArray; import android.graphics.Canvas; import android.graphics.Paint; import android.graphics.RectF; import android.graphics.Paint.FontMetrics; import android.util.AttributeSet; import android.view.View; import com.snailws.taskscompleted.R; /** * @author naiyu(http://snailws.com) * @version 1.0 */ public class TasksCompletedView extends View { // 画实心圆的画笔 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; public TasksCompletedView(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.TasksCompletedView, 0, 0); mRadius = typeArray.getDimension(R.styleable.TasksCompletedView_radius, 80); mStrokeWidth = typeArray.getDimension(R.styleable.TasksCompletedView_strokeWidth, 10); mCircleColor = typeArray.getColor(R.styleable.TasksCompletedView_circleColor, 0xFFFFFFFF); mRingColor = typeArray.getColor(R.styleable.TasksCompletedView_ringColor, 0xFFFFFFFF); mRingRadius = mRadius + mStrokeWidth / 2; } private void initVariable() { mCirclePaint = new Paint(); mCirclePaint.setAntiAlias(true); mCirclePaint.setColor(mCircleColor); mCirclePaint.setStyle(Paint.Style.FILL); 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.setARGB(255, 255, 255, 255); mTextPaint.setTextSize(mRadius / 2); 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); if (mProgress > 0 ) { 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 + "%"; mTxtWidth = mTextPaint.measureText(txt, 0, txt.length()); canvas.drawText(txt, mXCenter - mTxtWidth / 2, mYCenter + mTxtHeight / 4, mTextPaint); } } public void setProgress(int progress) { mProgress = progress; //invalidate(); postInvalidate(); }}

显示的效果图如下：