Android - 获取父布局的高度
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Android - get Height of the parent layout
提问by Robin
I want to determine the available height and width of the parent layout to which I have to add my view.
我想确定必须添加视图的父布局的可用高度和宽度。
I have used many methods on layout like
我在布局上使用了很多方法，比如
- layout.getHeight()
- layout.getRootView().getHeight()
- 布局.getHeight()
- layout.getRootView().getHeight()
All these methods return 0(zero) as the result.
所有这些方法都返回 0（零）作为结果。
My main requirement is to be able to give width to a view that is some % of the width of the layout .
我的主要要求是能够为视图赋予宽度为布局宽度的某些百分比。
Also I dont want to use tag for this. I want to do it through code.
我也不想为此使用标签。我想通过代码来做到这一点。
Thanks in advance.
提前致谢。
回答by Robin
Ok. I found a solution to it. The way we can get hieght of the screen in activity is
好的。我找到了解决方法。我们可以在活动中获得屏幕高度的方法是
getApplicationContext().getResources().getDisplayMetrics().heightPixels
getApplicationContext().getResources().getDisplayMetrics().heightPixels
But I still dont know how to get the pixel dimentions of parent layout?
但是我仍然不知道如何获取父布局的像素尺寸？
回答by Megha Joshi - GoogleTV DevRel
The issue here is you are trying to get the parent height/weight before the layoutmanager completes parent layout. You can only get parent dimensions, after its layout is complete.
这里的问题是您试图在 layoutmanager 完成父布局之前获取父高度/重量。您只能在布局完成后获取父维度。
The recommended way to do what you want to achieve is by using layout_weight field of LayoutParams. link text
推荐的方法是使用 LayoutParams 的 layout_weight 字段。 链接文字
In particular you should use:
特别是你应该使用：
LayoutParams lp = new LinearLayout.LayoutParams(width, height,
weight);
layout_weight value can be anything between 0.0 to 1.0. So for example if I have myButton within parentLayout, and I want myButton to occupy 30% of parent layout...I would use something like:
layout_weight 值可以是 0.0 到 1.0 之间的任何值。因此，例如，如果我在 parentLayout 中有 myButton，并且我希望 myButton 占据父布局的 30%...我会使用类似的东西：
myButton.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT,0.3));
The layout_weight sum of all child elements should be 1. Also, layout_weight should not be used with view's width or height set to LayoutParams.FILL_PARENT.
所有子元素的 layout_weight 总和应为 1。此外，layout_weight 不应与设置为 LayoutParams.FILL_PARENT 的视图的宽度或高度一起使用。
回答by lokoko
Try something like this :
尝试这样的事情：
view.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
public void onGlobalLayout() {
view.getHeight();
}
});
回答by Robeth
One alternative to programmatically implement this is to use following method:
以编程方式实现这一点的一种替代方法是使用以下方法：
public void onWindowFocusChanged(boolean b) { ...}
By the time this method is invoked, the layouting-process has been finished. Thus you can obtain the parent attributes correctly.
到调用此方法时，布局过程已完成。因此您可以正确获取父属性。
As Example:
例如：
public class A extends Activity {
LinearLayout parent;
Button child;
public void onCreate(Bundle b) {
parent = (LinearLayout) findViewById(R.id.linear1);
child = (Button) findViewById(R.id.button1);
.
.
}
@Override
public void onWindowFocusChanged(boolean b) {
LayoutParams lpc = child.getLayoutParams();
lpc.width = parent.getWidth();
child.postInvalidate();
.
.
}
}
回答by subaja
In OnCreate()method ,if you use layout.getHeight()and layout.getWidth(), it will returns 0, instead you can follow this:
在OnCreate()方法中，如果您使用layout.getHeight()and layout.getWidth()，它将返回 0，您可以按照以下步骤操作：
public void onClick(View v) {
// TODO Auto-generated method stub
int layWidth = Layout.getLeft();
int layHeight = Layout.getHeight();
break;
}
回答by trainz-are-kul
You are probobly calling getHeight()to early. Ensure that getParent().getHeight()is being called after viewGroup.addView(view0)and/or setContentView(activity_main.xml). This has happened to me in the past and this fixed it.
你可能是getHeight()提前打电话了。确保getParent().getHeight()在viewGroup.addView(view0)和/或之后调用setContentView(activity_main.xml)。这在过去发生在我身上，这解决了它。
