Didn't find class "android.support.v7.widget.RecyclerView"
是因為android.support.v4的版本不匹配的問題，android.support.v4的版本不匹配的問題，android.support.v4的版本不匹配的問題
重要的事情說三遍
Ubuntu + Eclipse, android sdk路徑：/home/steven/android-sdk-linux
再學習使用RecyclerView,按照教程的Demo,在Eclipse裡重寫了一遍。在模擬器上執行出錯。
提示 Didn't find class "android.support.v7.widget.RecyclerView".
首先你要把android.support.v7.widget.RecyclerView.jar這個包通過右鍵專案properties->java bulid path->libraries->add external jars加進去。我的android.support.v7.widget.RecyclerView.jar路進在/home/steven/android-sdk-linux/extras/android/support/v7/recyclerview/libs下。
然後在order and export裡面勾選上android.support.v7.widget.RecyclerView.jar(釋出的時候複製過去)
這時候再在模擬器上執行，還是提示錯誤： Didn't find class "android.support.v7.widget.RecyclerView".
這是因為android.support.v4的版本不匹配的問題，android.support.v7.widget.RecyclerView.jar會引用android.support.v4,但是它依賴的是android-sdk-linux/extras/android/support/v4/android.support.v4.jar，右鍵專案properties->java bulid path->libraries找到
android.support.v4.jar刪除它，重新add external jars，我的路徑是/home/steven/android-sdk-linux/extras/android/support/v4/android.support.v4.jar，最好在order and export裡把android.support.v4也勾選上。
轉自：http://blog.csdn.net/tingyuanss/article/details/45893661
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