自定义progressBar

xiaoxiao2021-03-26 8

public class CirclePgBar extends View { private Paint mBackPaint; private Paint mFrontPaint; private Paint mTextPaint; private float mStrokeWidth = 50; private float mHalfStrokeWidth = mStrokeWidth / 2; private float mRadius = 200; private RectF mRect; private int mProgress = 0; //目标值，想改多少就改多少 private int mTargetProgress = 90; private int mMax = 100; private int mWidth; private int mHeight; public CirclePgBar(Context context) { super(context); init(); } public CirclePgBar(Context context, AttributeSet attrs) { super(context, attrs); init(); } public CirclePgBar(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); init(); } //完成相关参数初始化 private void init() { mBackPaint = new Paint(); mBackPaint.setColor(Color.WHITE); mBackPaint.setAntiAlias(true); mBackPaint.setStyle(Paint.Style.STROKE); mBackPaint.setStrokeWidth(mStrokeWidth); mFrontPaint = new Paint(); mFrontPaint.setColor(Color.GREEN); mFrontPaint.setAntiAlias(true); mFrontPaint.setStyle(Paint.Style.STROKE); mFrontPaint.setStrokeWidth(mStrokeWidth); mTextPaint = new Paint(); mTextPaint.setColor(Color.GREEN); mTextPaint.setAntiAlias(true); mTextPaint.setTextSize(80); mTextPaint.setTextAlign(Paint.Align.CENTER); } //重写测量大小的onMeasure方法和绘制View的核心方法onDraw() @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); mWidth = getRealSize(widthMeasureSpec); mHeight = getRealSize(heightMeasureSpec); setMeasuredDimension(mWidth, mHeight); } @Override protected void onDraw(Canvas canvas) { initRect(); float angle = mProgress / (float) mMax * 360; canvas.drawCircle(mWidth / 2, mHeight / 2, mRadius, mBackPaint); canvas.drawArc(mRect, -90, angle, false, mFrontPaint); canvas.drawText(mProgress + "%", mWidth / 2 + mHalfStrokeWidth, mHeight / 2 + mHalfStrokeWidth, mTextPaint); if (mProgress < mTargetProgress) { mProgress += 1; invalidate(); } } public int getRealSize(int measureSpec) { int result = 1; int mode = MeasureSpec.getMode(measureSpec); int size = MeasureSpec.getSize(measureSpec); if (mode == MeasureSpec.AT_MOST || mode == MeasureSpec.UNSPECIFIED) { //自己计算 result = (int) (mRadius * 2 + mStrokeWidth); } else { result = size; } return result; } private void initRect() { if (mRect == null) { mRect = new RectF(); int viewSize = (int) (mRadius * 2); int left = (mWidth - viewSize) / 2; int top = (mHeight - viewSize) / 2; int right = left + viewSize; int bottom = top + viewSize; mRect.set(left, top, right, bottom); } } }

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