菜鸟求助 环信 Unknown Source

Question

 E/AndroidRuntime: FATAL EXCEPTION: main
                                                   java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.mvcqq/com.example.mvcqq.view.SplashActivity}: java.lang.NullPointerException
                                                       at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
                                                       at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
                                                       at android.app.ActivityThread.access$600(ActivityThread.java:141)
                                                       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
                                                       at android.os.Handler.dispatchMessage(Handler.java:99)
                                                       at android.os.Looper.loop(Looper.java:137)
                                                       at android.app.ActivityThread.main(ActivityThread.java:5041)
                                                       at java.lang.reflect.Method.invokeNative(Native Method)
                                                       at java.lang.reflect.Method.invoke(Method.java:511)
                                                       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
                                                       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
                                                       at dalvik.system.NativeStart.main(Native Method)
                                                    Caused by: java.lang.NullPointerException
                                                       at android.preference.PreferenceManager.getDefaultSharedPreferencesName(PreferenceManager.java:371)
                                                       at android.preference.PreferenceManager.getDefaultSharedPreferences(PreferenceManager.java:366)
                                                       at com.hyphenate.chat.EMSessionManager.getLastLoginUser(Unknown Source)
                                                       at com.hyphenate.chat.EMClient.isLoggedInBefore(Unknown Source)
                                                       at com.example.mvcqq.view.SplashActivity.onCreate(SplashActivity.java:26)
                                                       at android.app.Activity.performCreate(Activity.java:5104)
                                                       at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
                                                       at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
                                                       at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 
                                                       at android.app.ActivityThread.access$600(ActivityThread.java:141) 
                                                       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) 
                                                       at android.os.Handler.dispatchMessage(Handler.java:99) 
                                                       at android.os.Looper.loop(Looper.java:137) 
                                                       at android.app.ActivityThread.main(ActivityThread.java:5041) 
                                                       at java.lang.reflect.Method.invokeNative(Native Method) 
                                                       at java.lang.reflect.Method.invoke(Method.java:511) 
                                                       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 
                                                       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 
                                                       at dalvik.system.NativeStart.main(Native Method)

Answer 1

空指针啊 NullPointerException

Answer 2

 at com.example.mvcqq.view.SplashActivity.onCreate(SplashActivity.java:26)

Answer 3

我的问题是 我用的环信SDK 然后 引用环信的所有 方法 全都是 Unknown Source   是什么原因造成的呢

Answer 4

我知道是空指针  空指针的原因在于我的环信    我用的环信的方法 全部都是Unknown Source  所以会报空指针 我想的是怎么解决