NoSuchMethodException on Firebase.setAndroidContext()

Question

My application is isn't able to start. Firebase.setAndroidContext() in my onCreate() method is causing a NoSuchMethodException. See below:

protected Firebase ref;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    String firebaseUrl = getResources().getString(R.string.firebase_url);
    Firebase.setAndroidContext(getApplicationContext());
    ref = new Firebase(firebaseUrl);

} 

I also setup an application:

public class FirebaseApplication extends Application {
    @Override
    public void onCreate() {
        super.onCreate();
        Firebase.setAndroidContext(this);
    }
}

Which leads to the following stacktrace from logcat:

I/sf_frame_dur(   60): [com.android.launcher/com.android.launcher2.Launcher,0,0,0,20,42,40,20]
D/AndroidRuntime(14165): Shutting down VM
E/AndroidRuntime(14165): FATAL EXCEPTION: main
E/AndroidRuntime(14165): Process: com.github.r351574nc3.earshot, PID: 14165
E/AndroidRuntime(14165): java.lang.AssertionError: impossible
E/AndroidRuntime(14165):    at java.lang.Enum$1.create(Enum.java:45)
E/AndroidRuntime(14165):    at java.lang.Enum$1.create(Enum.java:35)
E/AndroidRuntime(14165):    at libcore.util.BasicLruCache.get(BasicLruCache.java:54)
E/AndroidRuntime(14165):    at java.lang.Enum.getSharedConstants(Enum.java:211)
E/AndroidRuntime(14165):    at java.lang.Class.getEnumConstants(Class.java:1029)
E/AndroidRuntime(14165):    at com.fasterxml.jackson.databind.cfg.MapperConfig.collectFeatureDefaults(MapperConfig.java:73)
E/AndroidRuntime(14165):    at com.fasterxml.jackson.databind.cfg.MapperConfigBase.<clinit>(MapperConfigBase.java:28)
E/AndroidRuntime(14165):    at com.fasterxml.jackson.databind.ObjectMapper.<init>(ObjectMapper.java:433)
E/AndroidRuntime(14165):    at com.fasterxml.jackson.databind.ObjectMapper.<init>(ObjectMapper.java:364)
E/AndroidRuntime(14165):    at com.firebase.client.Firebase.<clinit>(Firebase.java:41)
E/AndroidRuntime(14165):    at com.firebase.client.Firebase.setAndroidContext(Firebase.java:860) 
E/AndroidRuntime(14165):    at com.github.r351574nc3.earshot.EarshotApplication.onCreate(EarshotApplication.java:11)
E/AndroidRuntime(14165):    at android.app.Instrumentation.callApplicationOnCreate(Instrumentation.java:1008)
E/AndroidRuntime(14165):    at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4397)
E/AndroidRuntime(14165):    at android.app.ActivityThread.access$1500(ActivityThread.java:143)
E/AndroidRuntime(14165):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1317)
E/AndroidRuntime(14165):    at android.os.Handler.dispatchMessage(Handler.java:102)
E/AndroidRuntime(14165):    at android.os.Looper.loop(Looper.java:135)
E/AndroidRuntime(14165):    at android.app.ActivityThread.main(ActivityThread.java:5070)
E/AndroidRuntime(14165):    at java.lang.reflect.Method.invoke(Native Method)
E/AndroidRuntime(14165):    at java.lang.reflect.Method.invoke(Method.java:372)
E/AndroidRuntime(14165):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:836)
E/AndroidRuntime(14165):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:631)
E/AndroidRuntime(14165): Caused by: java.lang.NoSuchMethodException: values []
E/AndroidRuntime(14165):    at java.lang.Class.getMethod(Class.java:664)
E/AndroidRuntime(14165):    at java.lang.Class.getDeclaredMethod(Class.java:626)
E/AndroidRuntime(14165):    at java.lang.Enum$1.create(Enum.java:41)
E/AndroidRuntime(14165):    ... 22 more

From the stacktrace, you can see that the code that is actually causing the crash is Firebase.setAndroidContext(getApplicationContext());

Am I doing something wrong here? This is what the examples use, so I'm kinda confused.

Answer 1

As mentioned in Firebase API docs, the Firebase should be initialized before any Firebase reference is created or used. You should use setAndroidContext method in Application's onCreate() method. So you should create your own application class like this:

public class FirebaseApplication extends android.app.Application {
    @Override
    public void onCreate() {
        super.onCreate();
        Firebase.setAndroidContext(this);
    }
}

Then add it as name of your application tag in AndroidManifest:

 <application
        android:name="your.package.name.FirebaseApplication"
        //android:icon, android:label, android:theme, etc.
        ... >
      ...
  </application>

And then you can use Firebase in your activities:

protected Firebase ref;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    String firebaseUrl = getResources().getString(R.string.firebase_url);
    ref = new Firebase(firebaseUrl);

} 

EDIT:

So I don't know what's your problem, cause I was able to successfully build the project with Firebase, as in example. But I found one thing, that may be helpful for you. Try to add next lines to the proguard-rules.pro:

# For enumeration classes, see http://proguard.sourceforge.net/manual/examples.html#enumerations
-keepclassmembers enum * {
    public static **[] values();
    public static ** valueOf(java.lang.String);
}