Error:(24, 13) Failed to resolve: com.android.support:recyclerview-v7:20.+ <a href="install.m2.repo"

Android studio   报错    Error:(24, 13) Failed to resolve: com.android.support:recyclerview-v7:20.+

<a href="install.m2.repo">Install Repository and sync project</a><br><a href="openFile">Show in File</a><br><a href="open.dependency.in.project.structure">Show in Project Structure dialog</a>

   Error:(25, 13) Failed to resolve: com.android.support:leanback-v17:20.+
<a href="install.m2.repo">Install Repository and sync project</a><br><a href="openFile">Show in File</a><br><a href="open.dependency.in.project.structure">Show in Project Structure dialog</a>

点击运行  报

Error:A problem occurred configuring project ':myapplication'.
> Could not resolve all dependencies for configuration ':myapplication:_debugCompile'.
   > Could not find any version that matches com.android.support:recyclerview-v7:20.+.
     Searched in the following locations:
         https://jcenter.bintray.com/com/android/support/recyclerview-v7/maven-metadata.xml
         https://jcenter.bintray.com/com/android/support/recyclerview-v7/
         file:/D:/adt/adt-bundle-windows-x86_64-20140702/sdk/extras/android/m2repository/com/android/support/recyclerview-v7/maven-metadata.xml
         file:/D:/adt/adt-bundle-windows-x86_64-20140702/sdk/extras/google/m2repository/com/android/support/recyclerview-v7/maven-metadata.xml
         file:/D:/adt/adt-bundle-windows-x86_64-20140702/sdk/extras/google/m2repository/com/android/support/recyclerview-v7/
     Required by:
         MyApplication2:myapplication:unspecified
   > Could not find any version that matches com.android.support:leanback-v17:20.+.
     Searched in the following locations:
         https://jcenter.bintray.com/com/android/support/leanback-v17/maven-metadata.xml
         https://jcenter.bintray.com/com/android/support/leanback-v17/
         file:/D:/adt/adt-bundle-windows-x86_64-20140702/sdk/extras/android/m2repository/com/android/support/leanback-v17/maven-metadata.xml
         file:/D:/adt/adt-bundle-windows-x86_64-20140702/sdk/extras/google/m2repository/com/android/support/leanback-v17/maven-metadata.xml
         file:/D:/adt/adt-bundle-windows-x86_64-20140702/sdk/extras/google/m2repository/com/android/support/leanback-v17/
     Required by:
         MyApplication2:myapplication:unspecified

解决方案：

  1. 根据路径  找到 file:/D:/adt/adt-bundle-windows-x86_64-20140702/sdk/extras/android/m2repository/com/android/support/leanback-v17/maven-metadata.xml

  2.打开maven-metadata。xml    

metadata >

  < groupId > com.android.support </ groupId >

  < artifactId > recyclerview-v7 </ artifactId >

  < version > 21.0.0 </ version >

- < versioning >

- < versions >

  < version > 21.0.0 </ version >

  < version > 21.0.2 </ version >

  < version > 21.0.3 </ version >

  < version > 22.0.0 </ version >

  < version > 22.1.0 </ version >

  < version > 22.2.0 </ version >

  </ versions >

  < lastUpdated > 20150521233210 </ lastUpdated >

  </ versioning >

  </ metadata >

3.  可以看到版本号是21+，所以更改  

com.android.support:recyclerview-v7:20.+为

com.android.support:recyclerview-v7:21.+

同理根据上面方法打开

file:/D:/adt/adt-bundle-windows-x86_64-20140702/sdk/extras/android/m2repository/com/android/support/leanback-v17/maven-metadata.xml

<? xml version="1.0" encoding="UTF-8" ?>

- < metadata >

  < groupId > com.android.support </ groupId >

  < artifactId > leanback-v17 </ artifactId >

  < version > 21.0.0 </ version >

- < versioning >

- < versions >

  < version > 21.0.0 </ version >

  < version > 21.0.2 </ version >

  < version > 21.0.3 </ version >

  < version > 22.0.0 </ version >

  < version > 22.1.0 </ version >

  < version > 22.2.0 </ version >

  </ versions >

  < lastUpdated > 20150521233206 </ lastUpdated >

  </ versioning >

  </ metadata >

将 com.android.support:leanback-v17:20.+改为com.android.support:leanback-v17:21.+