Develop Reference

Firebase NullPointerException [duplicate]

This question already has answers here:
What is a NullPointerException, and how do I fix it?
(12 answers)
Closed 4 years ago.
Now that i finally got Firebase connected im having a Problem with The Authentification. Its a NullpointerException in Line 47 but i dont get why, maybe im just overlooking something or i cannot find the issue
Stacktrace:
05-14 20:57:52.413 8315-8315/com.github.compete E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.github.compete, PID: 8315
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.github.compete/com.github.compete.MainActivityMenu}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.view.View.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2379)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2442)
at android.app.ActivityThread.access$800(ActivityThread.java:156)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1351)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:211)
at android.app.ActivityThread.main(ActivityThread.java:5389)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1020)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:815)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.view.View.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
at com.github.compete.MainActivityMenu.onCreate(MainActivityMenu.java:47)
at android.app.Activity.performCreate(Activity.java:5990)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2332)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2442) 
at android.app.ActivityThread.access$800(ActivityThread.java:156) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1351) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:211) 
at android.app.ActivityThread.main(ActivityThread.java:5389) 
at java.lang.reflect.Method.invoke(Native Method) 
at java.lang.reflect.Method.invoke(Method.java:372) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1020) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:815) 
Code in Line 47:findViewById(R.id.nav_camera).setOnClickListener(this);
I dont see the problem, maybe i should stop for today.
-Thanks

There is no view having as id nav_camera in your view.

My app crashes when I try to navigate, can't seem to find issue

I can't seem to find whats wrong with my application...
Here is the logcat:
11-05 16:37:30.030 7867-7867/com.capstone.miguel.studentassistant E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.capstone.miguel.studentassistant, PID: 7867
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.capstone.miguel.studentassistant/com.capstone.miguel.studentassistant.user_sign.LoginActivity}: java.lang.ClassCastException: android.support.design.widget.TextInputEditText cannot be cast to android.support.design.widget.TextInputLayout
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2665)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
Caused by: java.lang.ClassCastException: android.support.design.widget.TextInputEditText cannot be cast to android.support.design.widget.TextInputLayout
at com.capstone.miguel.studentassistant.user_sign.LoginActivity.onCreate(LoginActivity.java:34)
at android.app.Activity.performCreate(Activity.java:6679)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2618)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726) 
at android.app.ActivityThread.-wrap12(ActivityThread.java) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:154) 
at android.app.ActivityThread.main(ActivityThread.java:6119) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776) 
Any idea why the application crashes?

It looks like you have wrong casting: java.lang.ClassCastException: android.support.design.widget.TextInputEditText cannot be cast to android.support.design.widget.TextInputLayout
Check if you use the same types in xml and in your code, probably they are different.

This line is the problem
Caused by: java.lang.ClassCastException: android.support.design.widget.TextInputEditText cannot be cast to android.support.design.widget.TextInputLayout
Check the declared types match those in the layout file

private TextInputEditText inputEmail, inputPass;
inputEmail = (TextInputEditText) findViewById(R.id.input_log_email);
inputPass = (TextInputEditText) findViewById(R.id.input_log_pass);

Android log cat error

The logcat message shows this:
12-05 19:24:09.406 28495-28495/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.user.fragment, PID: 28495
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.user.fragment/com.example.user.fragment.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2659)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2724)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1473)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6123)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:757)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
at com.example.user.fragment.MainActivity.onCreate(MainActivity.java:25)
at android.app.Activity.performCreate(Activity.java:6672)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1140)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2612)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2724) 
at android.app.ActivityThread.-wrap12(ActivityThread.java) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1473) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:154) 
at android.app.ActivityThread.main(ActivityThread.java:6123) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:757) 
The app has suddenly stopped working. What could be the possible error?

You have button defined in Activity file, and you are accessing layout button but which is actually not there. Please check at your end.

Google Play Store suddently began crashing every time I open it

Suddently, during regular usage of my Nexus 5, the Google Play Store started crashing every time I try to open it.
So, I tried to get the log of the error, here it is:
11664-11664/? E/AndroidRuntime: FATAL EXCEPTION: main Process: com.android.vending, PID: 11664
java.lang.RuntimeException: Unable to create application com.google.android.finsky.FinskyApp: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.app.AppOpsManager.checkPackage(int, java.lang.String)' on a null object reference
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4710)
at de.robv.android.xposed.XposedBridge.invokeOriginalMethodNative(Native Method)
at de.robv.android.xposed.XposedBridge.handleHookedMethod(XposedBridge.java:334)
at android.app.ActivityThread.handleBindApplication(<Xposed>)
at android.app.ActivityThread.-wrap1(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1405)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:102)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.app.AppOpsManager.checkPackage(int, java.lang.String)' on a null object reference
at android.os.Parcel.readException(Parcel.java:1605)
at android.os.Parcel.readException(Parcel.java:1552)
at android.content.pm.IPackageInstaller$Stub$Proxy.getMySessions(IPackageInstaller.java:385)
at android.content.pm.PackageInstaller.getMySessions(PackageInstaller.java:415)
at com.google.android.finsky.installer.PackageInstallerImpl.<init>(PackageInstallerImpl.java:71)
at com.google.android.finsky.installer.PackageInstallerFactory.init(PackageInstallerFactory.java:23)
at com.google.android.finsky.FinskyApp.onCreate(FinskyApp.java:387)
at android.app.Instrumentation.callApplicationOnCreate(Instrumentation.java:1013)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4707)
at de.robv.android.xposed.XposedBridge.invokeOriginalMethodNative(Native Method) 
at de.robv.android.xposed.XposedBridge.handleHookedMethod(XposedBridge.java:334) 
at android.app.ActivityThread.handleBindApplication(<Xposed>) 
at android.app.ActivityThread.-wrap1(ActivityThread.java) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1405) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:148) 
at android.app.ActivityThread.main(ActivityThread.java:5417) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 
at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:102) `
I tried to look for this error online, but couldn't find anything. I assume it's related to some system app that has one of her permissions unapproved (I don't know which could be the one), or maybe related to my Xposed Framework installation.
What could it be?
Thank you for your help.

its not any other problem did you see Attempt to invoke virtual method 'void android.app.AppOpsManager.checkPackage(int, java.lang.String)' on a null object reference. you have calling some null object reference.

Unable to start activity ComponentInfo When Activity Is Not Present

So I had created an activity called BagActivity and it's adapter etc. and have since deleted it as it was no longer required. I clean built the project, uninstalled apk from test devices and yet, I get the following error:
FATAL EXCEPTION: main
Process: in.ddas.pretense, PID: 11858
java.lang.RuntimeException: Unable to start activity ComponentInfo{in.ddas.pretense/in.ddas.pretense.BagActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v7.widget.RecyclerView.setLayoutManager(android.support.v7.widget.RecyclerView$LayoutManager)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2298)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v7.widget.RecyclerView.setLayoutManager(android.support.v7.widget.RecyclerView$LayoutManager)' on a null object reference
at in.ddas.pretense.BagActivity.onCreate(BagActivity.java:28)
at android.app.Activity.performCreate(Activity.java:5933)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2251)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360) 
at android.app.ActivityThread.access$800(ActivityThread.java:144) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:135) 
at android.app.ActivityThread.main(ActivityThread.java:5221) 
at java.lang.reflect.Method.invoke(Native Method) 
at java.lang.reflect.Method.invoke(Method.java:372) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694) 
What seems to be the problem?
Thanks.
EDIT: If I run this app in a different test device this error doesn't show! Why show it for 1 device?

It seems that you haven't deleted all BugActivity staff.
You have an exception:
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v7.widget.RecyclerView.setLayoutManager(android.support.v7.widget.RecyclerView$LayoutManager)' on a null object reference
at in.ddas.pretense.BagActivity.onCreate(BagActivity.java:28)
It caused second exception. So it says that you try to work with null RecyclerView object in onCreate method of BagActivity. You may delete layout of BagActivity without deleting activity class.