Android的自定义对话框高度 [英] Android custom dialog height

问题描述

我正在学习关于An​​droid的对话，我感到困惑的是什么决定了他们的高度。如果我用这个XML为我的对话框布局。 。 。

I'm learning about Android dialogs and I'm confused about what determines their height. If I use this XML for my dialog layout . . .

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content">
  <Button
     android:id="@+id/AButton"
     android:layout_height="wrap_content"
     android:layout_width="wrap_content"
     android:layout_alignParentRight="true"
     android:layout_marginLeft="10px"
     android:text="Click Me to Dismiss"
  /> 
  <TextView android:id="@+id/text"
    android:layout_width="wrap_content"
    android:layout_height="fill_parent"
    android:layout_toLeftOf="@id/AButton"
    android:text="Click this button: " 
    />
   <ImageView
    android:id="@+id/an_image"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="42px"
    android:src="@drawable/screw50">
  </ImageView>      
  />

我得到这个对话框。 。 。

I get this dialog . . .

但Developer.Android.com说...

But Developer.Android.com says that...

* WRAP_CONTENT，这意味着该视图希望成为刚好足够大以封闭其内容（加填充）*

"*WRAP_CONTENT, which means that the view wants to be just big enough to enclose its content (plus padding)*"

...那么，为什么是对话框，以便大大高于它需要？

... so why is the dialog so much higher than it needs to be?

如果我更换布局高度

  android:layout_height="200px"

它使一个正常的短对话，但我不希望使用显式像素高度（这不是好的做法）。如何使对话只是足够大的为它的内容？

it makes a properly short dialog but I don't want to use explicit pixel heights (it's not good practice). How do I make the dialog be just big enough for its content?

推荐答案

你有你的TextView的高度FILL_PARENT。是否有可能，这与RelativeLayout的高度结合，WRAP_CONTENT是推动其高度的最大尺寸是多少？如果你改变了TextView的高度为wrap_content会发生什么？

You have the height of your TextView to fill_parent. Is it possible that this, combined with the height of the RelativeLayout to wrap_content is pushing its height to the maximum size? What happens if you change the TextView height to wrap_content?

要添加，了Android SDK 说，一个RelativeLayout的子女不能有依赖在布局，如align_parent_bottom。我认为FILL_PARENT是一个依赖，因而是打破布局。

To add, the Android SDK says that children of a RelativeLayout can not have a dependency on the Layout, such as align_parent_bottom. I assume that fill_parent is a dependency and thus is breaking the layout.

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