怎么在Android应用中添加一个倒计时功能?针对这个问题,这篇文章详细介绍了相对应的分析和解答,希望可以帮助更多想解决这个问题的小伙伴找到更简单易行的方法。SweepView.java:public class SweepView ext
怎么在Android应用中添加一个倒计时功能?针对这个问题,这篇文章详细介绍了相对应的分析和解答,希望可以帮助更多想解决这个问题的小伙伴找到更简单易行的方法。
SweepView.java:
public class SweepView extends View { private static final int DEFAULT_WIDTH = 100; private static final int DEFAULT_HEIGHT = 100; private int mWidth; //这里并没卵用 private int mHeight; //这个也没卵用 private RectF rectF; private Paint paint; private int mColor = Color.RED;//默认颜色为红色 private float mSweep = 0; //扇形角度 public SweepView(Context context) { super(context); init(); } public SweepView(Context context, AttributeSet attrs) { super(context, attrs); init(); } public SweepView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); init(); } private void init() { paint = new Paint(); paint.setColor(mColor); //画笔颜色 paint.setStyle(Paint.Style.FILL); //填充 paint.setAntiAlias(true); //是否抗锯齿 } public void setColor(int color) { this.mColor = color; paint.setColor(mColor); //调用onDraw重绘 invalidate(); } public void setSweep(float mSweep) { this.mSweep = mSweep; //调用onDraw重绘 invalidate(); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { int resultWidth = measureWidth(widthMeasureSpec); int resultHeight = measureHeight(heightMeasureSpec); setMeasuredDimension(resultWidth, resultHeight); } private int measureWidth(int widthMeasureSpec) { int size = MeasureSpec.getSize(widthMeasureSpec); int mode = MeasureSpec.getMode(widthMeasureSpec); int result; if (mode == MeasureSpec.EXACTLY) { result = size; } else { result = DEFAULT_WIDTH; if (mode == MeasureSpec.AT_MOST) { result = Math.min(size, DEFAULT_WIDTH); } } return result; } private int measureHeight(int heightMeasureSpec) { int size = MeasureSpec.getSize(heightMeasureSpec); int mode = MeasureSpec.getMode(heightMeasureSpec); int result; if (mode == MeasureSpec.EXACTLY) { result = size; } else { result = DEFAULT_HEIGHT; if (mode == MeasureSpec.AT_MOST) { result = Math.min(size, DEFAULT_HEIGHT); } } return result; } @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { this.mHeight = h; this.mWidth = w; rectF = new RectF(0, 0, w, h); super.onSizeChanged(w, h, oldw, oldh); } @Override protected void onDraw(canvas canvas) { //画扇形 canvas.drawArc(rectF, -90, mSweep, true, paint); }}
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