Stuck with fetching name through Firebase

public
class AccountActivity extends AppCompatActivity {
    private
    TextView showprofile;
    private TextView showemail;
    private
    DatabaseReference userprofilereference;
    private FirebaseAuth mAuth;
    //    private String CurrentUserId;
    private
    FirebaseUser user;
    private Button delete;

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

        mAuth = FirebaseAuth.getInstance ();
        user = mAuth.getCurrentUser ();
        userprofilereference = FirebaseDatabase.getInstance ().getReference ().child (user.getUid ());
        showemail = (TextView) findViewById (R.id.edit_emailp);
        showemail.setText (user.getEmail ());
        showprofile = (TextView) findViewById (R.id.profile_name_textView);
        delete = (Button) findViewById (R.id.deleteaccount);


        delete.setOnClickListener (new View.OnClickListener () {
            @Override
            public
            void onClick ( View view ) {
                deleteUser ();
                startActivity (new Intent (AccountActivity.this, SignUpActivity.class));

            }
        });
        String uid = FirebaseAuth.getInstance().getCurrentUser().getUid();
        DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
        DatabaseReference uidRef = rootRef.child(uid);
        ValueEventListener eventListener = new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {
                dataSnapshot.child ("name");
                String name = dataSnapshot.getValue (String.class);
                showprofile.setText (name);
            }

            @Override
            public void onCancelled(DatabaseError databaseError) {}
        };
        uidRef.addListenerForSingleValueEvent(eventListener);

    }

There is no need of uid according to your database structure.

DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
DatabaseReference uidRef = rootRef.child("Users");
ValueEventListener eventListener = new ValueEventListener() {
	@Override
	public void onDataChange(DataSnapshot dataSnapshot) {
		String name = dataSnapshot.child("name").getValue(String.class);
		showprofile.setText (name);
	}

	@Override
	public void onCancelled(DatabaseError databaseError) { 
        throw databaseError.toException(); // never ignore errors
    }
};
uidRef.addListenerForSingleValueEvent(eventListener);

While Ashish's answer will perfectly fine, please note that your current database schema is not a correct one, since you are adding under a Users node only a single user. In the future, every time you want to add another user, all the data will be overridden. So the actual solution is to add another layer between the Users node and the actual data of the user. Your new database schema might look like this:

Firebase-root
   |
   --- Users
        |
        --- 1P7g ... 57RO (uid)
             |
             --- email: "aqsakarim@gmail.com"
             |
             --- id: "1P7g ... 57RO"
             |
             --- name: "aqsa kari"
             |
             --- uid: "1P7g ... 57RO"

In this way, you can distinguish each and every user within your Users node. That being said, your actual code will work, as I see you're using that uid that comes from the authentication process in your reference. So you don't have to change any line of code, for reading purposes.

Edit:

FirebaseFirestore rootRef = FirebaseFirestore.getInstance();
CollectionReference usersRef = rootRef.collection("Users");
String uid = FirebaseAuth.getInstance().getCurrentUser().getUid();
DocumentReference uidRef = usersRef.document(uid);
uidRef.set(userObject);

In which userObject is the object that holds all those properties.