android如何计算控件高度,如何获取到Android控件的高度
很多人在activity主线程中调用getWidth、getMeasuredWidth,却获取不到view的宽高,这是因为此时view还没有完成绘制,当然获取不到,那要怎么办呢?方法一,自己测量:intw=View.MeasureSpec.makeMeasureSpec(0,View.MeasureSpec.UNSPECIFIED);inth=View.MeasureSpec.make...
很多人在activity主线程中调用getWidth、getMeasuredWidth,却获取不到view的宽高,这是因为此时view还没有完成绘制,当然获取不到,那要怎么办呢?
方法一,自己测量:
int w = View.MeasureSpec.makeMeasureSpec(0,View.MeasureSpec.UNSPECIFIED);
int h = View.MeasureSpec.makeMeasureSpec(0,View.MeasureSpec.UNSPECIFIED);
view.measure(w, h);
int height = view.getMeasuredHeight();
int width = vew.getMeasuredWidth();
方法二,添加绘图监听,绘图结束后获取view的大小:
view.getViewTreeObserver().addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
public boolean onPreDraw() {
view.getViewTreeObserver().removeOnPreDrawListener(this);
int height = view.getMeasuredHeight();
int width = view.getMeasuredWidth();
return true;
}
});
方法三,添加全局布局变化监听:
view.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
view.getViewTreeObserver().removeGlobalOnLayoutListener(this);
view.getHeight();
view.getWidth();
}
});
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