I'm new at android developing. Here's my code that I copied on the firebase assistant
import android.nfc.Tag;
import android.util.Log;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ValueEventListener;
public class FirebaseDB {
DatabaseReference myRef = FirebaseDatabase.getInstance().getReference();
myRef.addValueEventListener(new ValueEventListener(){
@Override
public void onDataChange(DataSnapshot dataSnopshot){
String value = dataSnopshot.getValue(String.class);
Log.d(Tag, "Value is: " + value);
}
@Override
public void onCancelled(DatabaseError error) {
Log.w(Tag, "Failed to read value.", error.toException());
}
});
}
I'm using android studio 2.3.3
My problem is that, the myRef.addValueEventListener became error though myRef is a DatabaseReference which inherit Query class. I tried DatabaseReference myRef = new DatabaseReference();
still got me an error, also the new ValueEventListener()
, DataSnopshot dataSnopshot
and DatabaseError error
, same also for the Tag
Here's for the build.gradle, and the firebase assistant
Thanks for the help.
This looks like a firebase and appcompat dependency issue. firebase 10.0.2
is very old now. The latest version is
compile 'com.google.firebase:firebase-database:11.2.2
Also you buildtools version is 26, which conflicts with your targetsdk version 24
Could be that your errors are caused by sdk tools and libraries conflicts in your gradle. So try to update your support
libraries versions to latest which is currently 26.0.0-alpha1
or at least 25.3.1
.
For example compile 'com.android.support:appcompat-v7:25.3.1'
Then update your firebase
dependencies to latest version 11.2.2
.
Note: after upgrading firebase
libraries there are some new rules
compileSdkVersion
must be 26
also upgrade your targetSdkVersion
to 26 maven.google.com
like this: allprojects { repositories { jcenter() maven { url 'https://maven.google.com' } } }
For more see on: https://firebase.googleblog.com/2017/08/some-updates-to-apps-using-google-play.html
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