android-support-v 7-appcompatの構成使用

直接android-support-v 7-appcompat.JArパッケージをプロジェクトにコピーするlibs/以下は使用できません.具体的な方法については、公式ドキュメントで詳しく説明しています.
(開発環境はADT)
Using Eclipse
Create a  library project  based on the support library code:

Make sure you have downloaded the Android Support Library using the  SDK Manager .

Create a library project and ensure the required JAR files are included in the project's build path:

Select File > Import.

Select Existing Android Code Into Workspace and click Next.

Browse to the SDK installation directory and then to the Support Library folder. For example, if you are adding the appcompat  project, browse to  <sdk>/extras/android/support/v7/appcompat/ .

Click Finish to import the project. For the v7 appcompat project, you should now see a new project titled android-support-v7-appcompat.

In the new library project, expand the  libs/  folder, right-click each  .jar  file and select Build Path > Add to Build Path. For example, when creating the the v7 appcompat project, add both the  android-support-v4.jar  and android-support-v7-appcompat.jar  files to the build path.

Right-click the project and select Build Path > Configure Build Path.

In the Order and Export tab, check the  .jar  files you just added to the build path, so they are available to projects that depend on this library project. For example, the  appcompat  project requires you to export both the  android-support-v4.jar  and  android-support-v7-appcompat.jar  files.

Uncheck Android Dependencies.

Click OK to complete the changes.

You now have a library project for your selected Support Library that you can use with one or more application projects.
Add the library to your application project:

In the Project Explorer, right-click your project and select Properties.

In the Library pane, click Add.

Select the library project and click OK. For example, the  appcompat  project should be listed as android-support-v7-appcompat.

In the properties window, click OK.