Eclipse和Android SL GridLayout无法一起工作 - “android.support.v7.widget.GridLayout无法实例化” [英] Eclipse and Android SL GridLayout not working together - "android.support.v7.widget.GridLayout could not be instantiated"

问题描述

我是Android开发的新手，所以这可能是一个简单的问题。道歉，如果是 - 我花了相当多的时间搜索，但找不到任何有效的。

I'm new to Android development, so it's possible this is a simple question. Apologies if it is - I spent quite some time searching but couldn't find anything that worked.

我正在尝试在我的项目中使用GridLayout，但理想情况下Android支持库，所以我可以定位较低版本的API。当我将GridLayout拖动到图形布局设计器中时，会弹出一个消息，要求解释我需要一个兼容性库，用于14岁以上的API版本，并询问我是否要安装此库。我点击安装，让Eclipse做它的事情，但在Eclipse图形布局设计器中出现错误：
以下类不能被实例化：
- android.support .v7.widget.GridLayout
有关详细信息，请参阅错误日志（窗口>显示视图）。（截图）

I'm trying to use a GridLayout in my project, but ideally with the Android Support Library so I can target lower versions of the API. When I drag a GridLayout into the graphical layout designer, a message pops up asking explaining I need a compatibility library for API versions older than 14, and asks if I want to install this library. I hit "Install" and let Eclipse do its thing, but an error shows up in the Eclipse graphical layout designer: The following classes could not be instantiated: - android.support.v7.widget.GridLayout See the Error Log ( Window > Show View) for more details. (Screenshot)

从错误日志中，
android.support.v7 .widget.GridLayout无法实例化。 这是堆栈跟踪

我的搜索引起了这个错误这个SO线程，这似乎很有希望;我检查了我的Java，Eclipse和ADT版本，但似乎都是合理的最新版本（Java 7更新17，Eclipse Juno版本，ADT 21.1）。随着更新检查的出现，我看了一下这个SO用户是如何设置他的项目的：Gridlayout的一个图书馆项目，在这个主项目中这个库的一个项目引用，并将gridlayout jar复制到主项目的libs中夹。在Eclipse安装兼容性库消息之后，已经为我创建了一个gridlayout库项目，但项目引用尚未设置，并且没有复制gridlayout jar。我做了这两件事，但是GridLayout仍然没有实例化。

My search for this error turned up this SO thread, which seemed promising; I checked my Java, Eclipse and ADT versions but all seem to be reasonably up-to-date (Java 7 update 17, Eclipse Juno release, ADT 21.1). With the update checks out of the way, I looked at how that SO user had his project set up: a library project for the gridlayout, a project reference to this library in the main project, and the gridlayout jar copied into the main project's libs folder. Following the Eclipse "install compatibility library" message, a gridlayout library project had already been created for me, but the project reference had not been set up and the gridlayout jar hadn't been copied. I did both these things but still the GridLayout fails to instantiate.

我继续搜索，发现另一个SO线程。尽管线程不使用Eclipse，我尝试将答案转换为Eclipse等效项，与上述线程大致相同。 （将gridlayout jar复制到项目的libs文件夹，从gridlayout创建一个库项目，并从主项目中添加一个项目引用到该库项目。）我还验证了gridlayout jar在主项目的构建路径上。 （截图）

I continued searching and found another SO thread. Despite that thread not using Eclipse, I attempted to translate the answer into the Eclipse equivalent, which was roughly the same as given by the thread above. (Copy the gridlayout jar to the project's libs folder, create a library project from gridlayout, and add a project reference to that library project from within the main project.) I also verified that the gridlayout jar is on the main project's build path. (Screenshot)

我也是试图按照相关造型Android blogpost 中的说明进行操作，但更糟糕的是，当我尝试将GridLayout拖到我的项目中，它会抛出两个错误，一个 RelativeLayoutRule.onDropped（）失败：
java.lang.NullPointerException 与此堆栈跟踪和初始化项目状态与此堆栈跟踪。基于初始化项目状态堆栈跟踪中提到的IOException，我推测问题可能是我的Android SDK的安装位置：％APPDATA％\Local\Android 。我终于尝试卸载SDK并将其重新安装到％PROGRAMFILES％\Android ，但没有任何运气。

I also attempted to follow the instructions in the relevant Styling Android blogpost, but that's even worse: when I try to drag a GridLayout into my project, it throws two errors, a RelativeLayoutRule.onDropped() failed: java.lang.NullPointerException with this stack trace and an Initializing project state with this stack trace. Based on the IOException mentioned in the "Initializing project state" stack trace, I speculated the problem might be my install location for the Android SDK: %APPDATA%\Local\Android. I finally tried uninstalling the SDK and reinstalling it to %PROGRAMFILES%\Android but without any luck.

我我真的不知道从哪里走。如果有人可以给我指向正确的方向，我真的很感激！

I'm not really sure where to go from here. If anyone could give me a pointer in the right direction, I'd really appreciate it!

推荐答案

尝试：
文件 - >导入 - >现有的Android代码到工作空间
指定android-sdk- [platform] / extras / android / support / v7 / gridlayout

Try: File->Import->Existing Android code into workspace Specify android-sdk-[platform]/extras/android/support/v7/gridlayout

将GridLayout项目作为Android库项目导入工作。

You need to import the GridLayout project as an Android library project for it to work.

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