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Attempt to invoke virtual method 'int android.support.v7.widget.RecyclerView.getChildCount()' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'int android.support.v7.widget.RecyclerView.getChildCount()' on a null object reference	at com.wenming.weiswift.ui.login.activity.MainActivity.showHomeFragment(MainActivity.java:254)	at com.wenming.weiswift.ui.login.activity.MainActivity.switchToFragment(MainActivity.java:216)	at com.wenming.weiswift.ui.login.activity.MainActivity.restoreFragment(MainActivity.java:148)	at com.wenming.weiswift.ui.login.activity.MainActivity.onCreate(MainActivity.java:125)	at android.app.Activity.performCreate(Activity.java:6876)	at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1135)	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3206)	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3349)	at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:5382)	at android.app.ActivityThread.access$1200(ActivityThread.java:221)	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1800)	at android.os.Handler.dispatchMessage(Handler.java:102)	at android.os.Looper.loop(Looper.java:158)	at android.app.ActivityThread.main(ActivityThread.java:7224)	at java.lang.reflect.Method.invoke(Native Method)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)	at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:134)