Cfrgtkky

I try to update the data in Firebase Realtime Database through Android app. It will only occasionally work after I open the app and wait for some time. Most of the time it does not work. In my case, working mean the data is updated in cloud. I am wondering why it work sometimes and do not work sometimes. There is no error or warning in Logcat. Once it works, it will continue to work until the app is restarted.

DbHelper class

public class DbHelper {

    static final String TAG = "ttt";



    int count = 0;



    private static FirebaseDatabase database = FirebaseDatabase.getInstance();

    private static DatabaseReference myRef = database.getReference("message");



    TextView tv;



    public DbHelper(final TextView tv){

        this.tv = tv;



        myRef.addValueEventListener(new ValueEventListener() {

            @Override

            public void onDataChange(DataSnapshot dataSnapshot) {

                String text = dataSnapshot.getValue(String.class);

                tv.setText(text);

                Log.d(TAG, "Value is: " + text);

            }



            @Override

            public void onCancelled(DatabaseError databaseError) {

                Log.w(TAG, "Failed to read value.", databaseError.toException());

            }

        });

    }



    public void testing(){

        myRef.setValue("test"+count++);

    }

}

MainActivity

public class MainActivity extends AppCompatActivity {

    TextView textTesting;

    DbHelper dbHelper;



    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);

        setSupportActionBar(toolbar);



        textTesting = (TextView)findViewById(R.id.text_testing);

        dbHelper = new DbHelper(textTesting);



        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);

        fab.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View view) {

                dbHelper.testing();

            }

        });

    }

}

Added

DatabaseReference connectedRef = FirebaseDatabase.getInstance().getReference(".info/connected");

connectedRef.addValueEventListener(new ValueEventListener() {

    @Override

    public void onDataChange(DataSnapshot snapshot) {

        boolean connected = snapshot.getValue(Boolean.class);

        if (connected) {

            Log.d(TAG, "connected");

        } else {

            Log.d(TAG, "not connected");

        }

    }



    @Override

    public void onCancelled(DatabaseError error) {

        System.err.println("Listener was cancelled");

    }

});

Logcat

11-14 20:26:58.956 19329-19384/? V/FA: Connection attempt already in progress

11-14 20:26:58.956 19329-19384/? V/FA: Connection attempt already in progress

11-14 20:26:58.961 19329-19384/? V/FA: Activity resumed, time: 167270724

11-14 20:26:58.986 19329-19384/? D/FA: Connected to remote service

11-14 20:26:59.001 19329-19329/? I/Timeline: Timeline: Activity_idle id: android.os.BinderProxy@34fb88b7 time:15941479

11-14 20:26:59.006 19329-19384/? V/FA: Processing queued up service tasks: 4

11-14 20:26:59.056 19329-19336/? I/art: Ignoring second debugger -- accepting and dropping

11-14 20:26:59.541 19329-19329/? D/ViewRootImpl: ViewPostImeInputStage ACTION_DOWN

11-14 20:26:59.631 19329-19329/? D/ttt: Value is: test0

11-14 20:27:02.366 19329-19329/? D/ViewRootImpl: ViewPostImeInputStage ACTION_DOWN

11-14 20:27:02.451 19329-19329/? D/ttt: Value is: test1

11-14 20:27:04.166 19329-19384/? V/FA: Inactivity, disconnecting from the service

11-14 20:28:07.721 19329-19329/? D/FA: Service connection suspended