我希望做的是,从按钮边缘画一条线到屏幕上的某个点...
我正在使用对话框片段进行此操作...但我尝试过的所有函数都返回0点...
我尝试了以下方法:
@Override
protected Dialog createDialog(Bundle savedInstanceState, FragmentActivity activity)
{
Dialog d = builder.create();
View v = LayoutInflater.from(activity).inflate(R.layout.dialog, null);
builder.setView(v);
// custom view by my which draws simple lines between points...
LineDrawView ldv = new LineDrawView(getActivity());
ldv.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
((RelativeLayout)v).addView(ldv);
Dialog d = builder.create();
button = ((Button) v.findViewById(R.id.button));
int[] pos = new int[2];
button.getLocationInWindow(pos);
// tried following ways, all always return p(0, 0)
// button.getLocationInWindow(pos);
// Debugger.d("x: " + pos[0] + ", y: " + pos[1], "POS");
// button.getLocationOnScreen(pos);
// Debugger.d("x: " + pos[0] + ", y: " + pos[1], "POS");
// float x = button.getLeft();
// float y = button.getTop();
// Debugger.d("x: " + x + ", y: " + y, "POS");
ldv.addLine(new Point(pos[0], pos[1]), new Point(pos[0] + 30, pos[1]), Color.RED);
ldv.invalidate();
return d;
}
它始终从p(0, 0)到p(0, 30)绘制一条线...
如何获取屏幕上按钮的位置或相对于其父视图的位置?我认为,布局尚未完成,因此我必须稍后在某个地方绘制我的线条,但是在何时和何处呢?