save data from a textview in firebase database

Question

I'm trying to save the contents of a textview in firebase database but when I press the button that has to do this it does not perform the action but the application does not stop or anything.

this is my code

XML

    <TextView
    android:id="@+id/emailTextView"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:layout_below="@+id/nameTextView"
    android:layout_marginTop="16dp"
    android:text="@string/app_name"
    android:textAlignment="center"
    android:textSize="16sp" />

Java

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

    // Mostramos el webview

    WebView myWebView = (WebView) findViewById(R.id.terminos);
    WebSettings webSettings = myWebView.getSettings();
    webSettings.setJavaScriptEnabled(true);
    myWebView.setWebViewClient(new WebViewClient());
    myWebView.loadUrl("http://zxxxxxxxxx.saq.es");


    // Boton pulsado

    // Insertamos datos en la base de datos


    userEmail = (TextView) findViewById(emailTextView);
    btacepto = (Button) findViewById(R.id.cambiarhome);

    btacepto.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Firebase ref = new Firebase("https://payads-2c114.firebaseio.com/users");
            String enteredUserEmail = userEmail.getText().toString();
            ref.child("users").setValue(enteredUserEmail);
        }
    });
}

}

error

09-08 16:35:19.790 5341-5341/albertonio.payads E/AndroidRuntime: FATAL EXCEPTION: main
                                                             Process: albertonio.payads, PID: 5341
                                                             java.lang.RuntimeException: You need to set the Android context using Firebase.setAndroidContext() before using Firebase.
                                                                 at com.firebase.client.core.Context.getPlatform(Context.java:45)
                                                                 at com.firebase.client.core.Context.ensureLogger(Context.java:218)
                                                                 at com.firebase.client.core.Context.initServices(Context.java:105)
                                                                 at com.firebase.client.core.Context.freeze(Context.java:92)
                                                                 at com.firebase.client.core.RepoManager.getLocalRepo(RepoManager.java:55)
                                                                 at com.firebase.client.core.RepoManager.getRepo(RepoManager.java:19)
                                                                 at com.firebase.client.Firebase.<init>(Firebase.java:172)
                                                                 at com.firebase.client.Firebase.<init>(Firebase.java:177)
                                                                 at com.firebase.client.Firebase.<init>(Firebase.java:155)
                                                                 at albertonio.payads.TerminosActivity$1.onClick(TerminosActivity.java:48)
                                                                 at android.view.View.performClick(View.java:4780)
                                                                 at android.view.View$PerformClick.run(View.java:19866)
                                                                 at android.os.Handler.handleCallback(Handler.java:739)
                                                                 at android.os.Handler.dispatchMessage(Handler.java:95)
                                                                 at android.os.Looper.loop(Looper.java:135)
                                                                 at android.app.ActivityThread.main(ActivityThread.java:5254)
                                                                 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:903)
                                                                 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)

Line 48: Firebase ref = new Firebase("https://payads-2c114.firebaseio.com");

this error i sow in Android Monitor when the code is in the metod Onclick

---

I changed

          Firebase ref = new Firebase("https://payads-2c114.firebaseio.com/users");
        String enteredUserEmail = userEmail.getText().toString();
        ref.child("users").setValue(enteredUserEmail);

to

DatabaseReference databaseRef = FirebaseDatabase.getInstance().getReference(); databaseRef.child("users").setValue(enteredUserEmail);

and now when i push the button all dates of the node users are deleted but you do not write what I want

Answer 1

I would suggest using FirebaseDatabaseReference instead

DatabaseReference databaseRef = FirebaseDatabase.getInstance().getReference();

databaseRef.child("users").setValue(enteredUserEmail);

This way you get around the hardcoded stuff, and if the firebase is setup correctly it should work properly

Also remember these in your gradle (Module:app)

compile 'com.google.firebase:firebase-core:11.0.4'
compile 'com.google.firebase:firebase-database:11.0.4'

It looks like something is off with your btnClickListener?

btacepto.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        Firebase ref = new Firebase("https://payads-2c114.firebaseio.com/users");
        String enteredUserEmail = userEmail.getText().toString();
        ref.child("users").setValue(enteredUserEmail);
    }
});

Move this out to onCreate().

Remove the public void btn(View view) {} around it.

Try adding Firebase.setAndroidContext(this); onCreate()

Answer 2

As we see in Firebase Quickstart Documentation :

The Firebase library must be initialized once with an Android Context. This must happen before any Firebase reference is created or used.

You activity class should look like this:

public class MainActivity extends Application {
    @Override
    public void onCreate() {
        super.onCreate();
        Firebase.setAndroidContext(this); //Older Version

        if(!FirebaseApp.getApps(this).isEmpty()) { //Newer Version
            FirebaseDatabase.getInstance().setPersistenceEnabled(true);
        }
    }
}