android 绘制多层画布,在android中用画布绘制四分之一规格？

Henry..

6

你可以谷歌找到一堆GagueViews.我想你已经做到了.

这看起来很简单.所以你可以编写自己的自定义View.您可以使用drawArc绘制3种不同颜色的圆弧.您可以使用drawLine绘制测量点(只需记住设置Paint.setStrokeCap(Cap.Round)).至于针,你可以使用drawPath.通过一些努力和正确的坐标,您应该能够自己编写一个漂亮的GaugeView.

如果您发现编写自己的看法很难,你可以参考一些GaugeView在GitHub.你会得到一个很好的起点.

更新:我写了一个简单的GaugeView基于你问题的图像.计算以像素为单位,您可能希望将它们相乘DisplayMetrics.density,以便它们处于独立像素中.此外,您可能希望通过xml在此处公开大多数值,因此您可以在布局中控制它们.这可能是一个很好的起点.

public class GaugeView extends View {

private Paint arcPaint;

public GaugeView(Context context) {

super(context);

initialize();

}

public GaugeView(Context context, AttributeSet attrs) {

super(context, attrs);

initialize();

}

public GaugeView(Context context, AttributeSet attrs, int defStyleAttr) {

super(context, attrs, defStyleAttr);

initialize();

}

private void initialize() {

arcPaint = new Paint(Paint.ANTI_ALIAS_FLAG);

arcPaint.setStyle(Paint.Style.STROKE);

arcPaint.setStrokeWidth(15f);

}

@Override

protected void onDraw(Canvas canvas) {

int width = canvas.getWidth();

int height = canvas.getHeight();

int arcCenterX = width - 10;

int arcCenterY = height - 10;

final RectF arcBounds = new RectF(arcCenterX - 100, arcCenterY - 100, arcCenterX + 100, arcCenterY + 100);

// Draw the arc

canvas.drawArc(arcBounds, 180f, 20f, false, arcPaint);

arcPaint.setColor(Color.DKGRAY);

canvas.drawArc(arcBounds, 200f, 40f, false, arcPaint);

arcPaint.setColor(Color.GRAY);

canvas.drawArc(arcBounds, 2400f, 30f, false, arcPaint);

// Draw the pointers

final int totalNoOfPointers = 20;

final int pointerMaxHeight = 25;

final int pointerMinHeight = 15;

int startX = arcCenterX - 120;

int startY = arcCenterY;

arcPaint.setStrokeWidth(5f);

arcPaint.setStrokeCap(Paint.Cap.ROUND);

int pointerHeight;

for (int i = 0; i <= totalNoOfPointers; i++) {

if(i%5 == 0){

pointerHeight = pointerMaxHeight;

}else{

pointerHeight = pointerMinHeight;

}

canvas.drawLine(startX, startY, startX - pointerHeight, startY, arcPaint);

canvas.rotate(90f/totalNoOfPointers, arcCenterX, arcCenterY);

}

}

}

最终渲染的图像如下所示: