动态更改相对布局的宽度和高度 [英] Change Relative layout width and height dynamically

问题描述

我在LinearLayout中使用以下布局结构

Hi i am using following layout structure inside LinearLayout

<TableLayout
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" >

    <TableRow
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" >
    </TableRow>

    <TableRow
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" >

        <TextView
            android:id="@+id/tv1"
            android:layout_height="wrap_content"
            android:gravity="left"
            android:paddingLeft="10dp"
            android:textColor="#000" />

        <TextView
            android:id="@+id/tv2"
            android:layout_height="wrap_content"
            android:layout_weight="1.0"
            android:gravity="right"
            android:paddingRight="10dp"
            android:textColor="#000" />
    </TableRow>
</TableLayout>

<ImageView
    android:id="@+id/img1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center" />

<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="320px"
    android:layout_height="320px"
    android:gravity="center" >
</RelativeLayout>

，并且想从Java文件动态设置相对布局的宽度和高度，而不是在xml文件中将其设置为320px，但不能做到这一点，方向更改不是问题，因为我将其限制为仅在纵向模式下使用.可以通过使用match_parent在全屏上设置相对布局，但是我必须在屏幕上放置另一个视图，所以有可能还是我必须以另一种方式实现它...

and want to set relative layout width and height dynamically from java file instead of setting it to 320px in the xml file but not able to do that , Orientation change is not an issue for as i restricting it to only in Portrait mode. It is possible to set the relative layout on full screen by using match_parent but i have to put another views on the screen so is it possible or i have to achieve it another way...

推荐答案

显示后，Android不会使用wrap_content刷新视图的布局. 即使使用invalidate()或requestLayout(). 因此，如果您添加子视图或动态修改内容，则会很麻烦.

Android does NOT refresh layout of views with wrap_content once it has been displayed. Even with invalidate() or requestLayout(). So if you add a child view, or modify the content dynamically, you're screwed.

getLayoutParams().height = x加requestLayout()是一个很好的解决方案. 之后，LayoutParams中的wrap_content丢失了，因为您已覆盖它.

getLayoutParams().height = x plus requestLayout() are a good solution if you know the "x", and if you need to do it ONLY ONCE. After that the wrap_content in LayoutParams is lost, since you have overridden it.

为解决这个问题，我编写了一个静态类，该类重新计算大小并使用wrap_content强制更新视图的布局.此处提供了代码和使用说明:

To solve that, I've written a static class that recomputes the sizes and forces the update of the layout for the views with wrap_content. The code and instructions to use are available here:

https://github.com/ea167/android-layout-wrap-content-updater

享受！

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