Sahaj Rana Sahaj Rana - 6 months ago 535
Android Question

Class java.util.Map has generic type parameters, please use GenericTypeIndicator instead

I am using firebase to retrieve data from database n use

Map<String, String> map = dataSnapshot.getValue(Map.class);


to get values, but it shows error

E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.rana.sahaj.myyu, PID: 13179
com.google.firebase.database.DatabaseException: Class java.util.Map has generic type parameters, please use GenericTypeIndicator instead
at com.google.android.gms.internal.zzaix.zzb(Unknown Source)
at com.google.android.gms.internal.zzaix.zza(Unknown Source)
at com.google.firebase.database.DataSnapshot.getValue(Unknown Source)
at com.rana.sahaj.myyu.profile.Profile$2.onDataChange(Profile.java:158)
at com.google.android.gms.internal.zzafp.zza(Unknown Source)
at com.google.android.gms.internal.zzagp.zzSu(Unknown Source)
at com.google.android.gms.internal.zzags$1.run(Unknown Source)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5052)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:609)
at dalvik.system.NativeStart.main(Native Method)


here's the code

DatabaseReference profileRef=mFirebaseRef.child(EEmail);
profileRef.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {

--> Map<String, String> map = (Map<String,String>)dataSnapshot.getValue(Map.class);

name = (TextView)findViewById(R.id.UserInActivity);
EmailView= (TextView)findViewById(R.id.emailUser);

PhotoUrl = map.get("picurl");
emmaill=map.get("userEmail");

UserNam = map.get("userNAME");

name.setText(UserNam);
EmailView.setText(emmaill);


}

@Override
public void onCancelled(DatabaseError firebaseError) {

}
});


n there is no problem with key n values in database.
used the solution but not working

Answer

The error points out correctly where you are going wrong

 Map<String, String> map = dataSnapshot.getValue(Map.class);

Map class uses parameter to define the types of Key and Object where as you don't give them and simply use Map.class which fails.

Try the below code - since Key are always string and we can have any type of Object for them

    Map<String, Object> map = (Map<String, Object>) dataSnapshot.getValue();