机器人：在API重未能18+ [英] android:gravity fails on API 18+

问题描述

我有我的应用程序的一些TextViews，我不知道为什么，但安卓重力属性不居中的文本内容，它应该是上运行的设备API 18+（4.3 +）。

I have some TextViews on my app, I don't know why but the android:gravity attribute is not centering the text content where it should be on devices running the API 18+ (4.3+).

还有就是code我在我的自定义使用的TextView ，这是RelativeLayout的一个孩子：

There is the code I use on my custom TextView, this is a child of RelativeLayout:

<com.package.custom.CustomTextFont
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignBottom="@+id/seekbar"
    android:layout_alignParentLeft="true"
    android:layout_alignTop="@+id/seekbar"
    android:layout_marginLeft="@dimen/margin_tiny_double"
    android:layout_toLeftOf="@+id/seekbar"
    android:gravity="center_vertical|left"
    android:paddingRight="@dimen/margin_tiny"
    android:text="@string/text1"
    android:textColor="@color/black"
    android:textSize="@dimen/size_text_normal" />

这code应该抓住边缘的TextView 键，将其调整到顶部和底部，并把它放到左侧的搜索栏，这是工作，但的TextView 变大，所以用安卓重力我中心文本中心，从它的自我离开了。它的工作原理，但我不知道为什么，文本不集中在中心|留在设备运行的是Android 4.3和4.4。这个问题可以再现真实的设备和以及在布局上preVIEW的Eclipse（图形布局）。

This code should take the edges of this TextView and align it to the top and bottom and put it to the Left of the SeekBar, this is working, but the TextView gets big, so with android:gravity I center the text to the center and left from it self. It works, but I don't know why, the text is not centered at center|left on devices running android 4.3 and 4.4. This issue can be reproduced on real devices and as well on the layout preview (Graphic layout) of Eclipse.

有或安卓作出API 18+的任何变化：重力我失踪？

PS：我打靶的API 19的项目，并在AndroidManifest.xml中

PS: I'm targetting the API 19 on the project and on AndroidManifest.xml

PS2：我TextView的是自定义的只是设置一个外部font.tff

PS2: My TextView is custom just to set an external font.tff

这是怎么看起来像API 17日 -

这是怎么看起来像API 18 +

在此先感谢！

= UPTADATE =

在我的清单，我改变了安卓targetSdkVersion 17，而不是19，问题消失了，但这是一个绝招，而不是一个解决方案，又能怎样我这样做，因为它可能是从API的问题？是的，我有API的18和19（今天，二○一四年一月三十零日）的最新版本。

On my Manifest, I changed the android:targetSdkVersion to 17 instead of 19 and the problem disappeared, but this is a "trick", not a solution, what can I do since it could be an issue from the API ? And yes, I have the latest version of the API 18 and 19 (today, 01/30/2014).

推荐答案

这似乎是API的一个已知问题18 +：

This appears to be a known issue in API 18+:

<一个href="https://$c$c.google.com/p/android/issues/detail?id=59368">https://$c$c.google.com/p/android/issues/detail?id=59368 <一href="https://$c$c.google.com/p/android/issues/detail?id=59700">https://$c$c.google.com/p/android/issues/detail?id=59700

这个问题似乎当一个TextView是一个可滚动容器（例如ListView控件）的组成部分，使视图忽略出于某种原因，垂直重力（一些消息​​来源认为这有做的TextView的是一个RelativeLayout的儿童发生，虽然这是我的经验是不涉及这样的布局，即使会发生这种情况）。

The problem seems to occur when a TextView is part of a scrollable container (e.g. ListView), making the view ignore the vertical gravity for some reason (some sources suggest this has to do with the TextView being the child of a RelativeLayout, though it's been my experience that this can happen even when no such layout is involved).

一个可能的解决方法（虽然不是一个特别优雅的），将是包装在一个LinearLayout中的TextView的。然后，您可以使用layout_gravity上的TextView到的LinearLayout内线中锋，而不是依赖地心引力吧，（只要确保WRAP_CONTENT因此文本本身是否正确居中）。

A possible workaround (albeit not a particularly elegant one), would be to wrap the TextView in a LinearLayout. You can then use "layout_gravity" on the TextView to center it inside the LinearLayout, instead of relying on "gravity" (just make sure to wrap_content so the text itself is properly centered).

例如，在你的例子：

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_alignBottom="@+id/seekbar"
    android:layout_alignParentLeft="true"
    android:layout_alignTop="@+id/seekbar"
    android:layout_toLeftOf="@+id/seekbar"
    android:layout_marginLeft="@dimen/margin_tiny_double" >

    <com.package.custom.CustomTextFont
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center_vertical"
        android:gravity="left"
        android:paddingRight="@dimen/margin_tiny"
        android:text="@string/text1"
        android:textColor="@color/black"
        android:textSize="@dimen/size_text_normal" />

</LinearLayout>

此方法确实有添加，否则，不必要的水平视图层次结构的缺点，但它目前似乎是解决这个问题的唯一途径（不是恢复到一个较早的API级别等）。

This method does have the disadvantage of adding an otherwise-unnecessary level to your view hierarchy, but it currently seems to be the only way around this (other than reverting to an earlier API level).

也看到类似的问题： <一href="http://stackoverflow.com/questions/20239547/android-sdk-18-textview-gravity-doesnt-work-vertically">Android SDK 18 TextView的重力不起作用垂直

Also see similar question at: Android sdk 18 TextView gravity doesn't work vertically

这篇关于机器人：在API重未能18+的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！