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Show progress dialog while fetching data from firebase database

I want the Activity to show a Progress Dialog indication when fetching data from Firebase database. It doesn't show anything and breaks. here is my code below

public class profilemain extends AppCompatActivity {

private FirebaseAuth mAuth;
private FirebaseAuth.AuthStateListener mAuthListener;

 private ProgressDialog progressDialog;

DatabaseReference mref = 
FirebaseDatabase.getInstance().getReference("users");
ListView mlistview;
ArrayList<String> arrayList=new ArrayList<>();
ArrayAdapter<String> arrayAdapter;

private BottomNavigationView.OnNavigationItemSelectedListener 
 mOnNavigationItemSelectedListener
        = new BottomNavigationView.OnNavigationItemSelectedListener() {

    @Override
    public boolean onNavigationItemSelected(@NonNull MenuItem item) {
        switch (item.getItemId()) {
            case R.id.navigation_home:
progressDialog.show();
                startActivity(new 
Intent(profilemain.this,profilemain.class));
                return true;
            case R.id.navigation_dashboard:
                Toast.makeText(profilemain.this,"hi 
hello",Toast.LENGTH_SHORT).show();
                return true;
            case R.id.navigation_notifications:
                Toast.makeText(profilemain.this,"hi 
hello",Toast.LENGTH_SHORT).show();
                return true;
            case R.id.navigation_signout:

                Toast.makeText(profilemain.this,"You have successfully 
Signed out",Toast.LENGTH_SHORT).show();
                mAuth.signOut();
                return true;
        }
        return false;
    }

};

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_profilemain);
   progressDialog.setMessage("loading");
    progressDialog.setTitle("database is");

    mlistview=(ListView) findViewById(R.id.listview);

    Firebase.setAndroidContext(this);

    DatabaseReference ref = FirebaseDatabase.getInstance()
            .getReference("users");
    //mref=new Firebase("https://stark-1dffd.firebaseio.com/users");
    arrayAdapter=new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,arrayList);
    mlistview.setAdapter(arrayAdapter);


    mref.addChildEventListener(new ChildEventListener() {
        @Override
        public void onChildAdded(DataSnapshot dataSnapshot, String s) {
            String value= dataSnapshot.getValue(String.class);

            arrayList.add(value);
            arrayAdapter.notifyDataSetChanged();
            //

            //

        }

        @Override
        public void onChildChanged(DataSnapshot dataSnapshot, String s) {

        }

        @Override
        public void onChildRemoved(DataSnapshot dataSnapshot) {

        }

        @Override
        public void onChildMoved(DataSnapshot dataSnapshot, String s) {

        }

        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    });


    BottomNavigationView navigation = (BottomNavigationView) findViewById(R.id.navigation);
    navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener);
    mAuth = FirebaseAuth.getInstance();


    mAuthListener = new FirebaseAuth.AuthStateListener() {
        @Override
        public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
            if (firebaseAuth.getCurrentUser()==null){
                startActivity(new
                        Intent(profilemain.this,MainActivity.class));

            }
        }
    };



}

@Override
protected void onStart() {
    super.onStart();

    mAuth.addAuthStateListener(mAuthListener);
}

      Process: com.food.sheenishere.stark, PID: 16408

com.google.firebase.database.DatabaseException: Failed to convert value of type 
java.util.HashMap to String

at com.google.android.gms.internal.zg.zzb(Unknown Source)

at com.google.android.gms.internal.zg.zza(Unknown Source)

at com.google.firebase.database.DataSnapshot.getValue(Unknown Source)

at com.food.sheenishere.stark.home$1.onChildAdded(home.java:49)

at com.google.android.gms.internal.px.zza(Unknown Source)

at com.google.android.gms.internal.vj.zzHX(Unknown Source)

   at com.google.android.gms.internal.vp.run(Unknown Source)

at android.os.Handler.handleCallback(Handler.java:751)

at android.os.Handler.dispatchMessage(Handler.java:95)

at android.os.Looper.loop(Looper.java:154)

at android.app.ActivityThread.main(ActivityThread.java:6119)

at java.lang.reflect.Method.invoke(Native Method)

   at

com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run (ZygoteInit.java:886)

    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
07-15 20:49:51.645 16408-16435/com.food.sheenishere.stark W/DynamiteModule: 
Local module descriptor class for com.google.firebase.auth not found.
+3


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2 answers


The problem in your code is that you are trying to use the show (), setMessage ("download") and setTitle ("database") methods on an object ProgressDialog

that has never been initialized.

To solve your problem, you need to use the following code:



ProgressDialog progressDialog = new ProgressDialog(this);

He will surely solve your problem.

+1


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You must initialize the progress dialog. below, for example



 private ProgressDialog pDialog;

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

    pDialog = new ProgressDialog(profilemain.this);
    pDialog.setMessage("loading..");
}
+2


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