Sorry for this beginner question, but being very new to java, I can't figure out how to get value from a method in another file.
Here is my code fragment: First, I have defined a string and used it inside a class:
public class MainActivity extends AppCompatActivity {
private TextView mTextMessage;
String date = new SimpleDateFormat("yyyy-MM-dd", Locale.getDefault()).format(new Date());
private BottomNavigationView.OnNavigationItemSelectedListener mOnNavigationItemSelectedListener
= new BottomNavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
switch (item.getItemId()) {
case R.id.navigation_home:
mTextMessage.setText(R.string.menu_home);
return true;
case R.id.navigation_dashboard:
mTextMessage.setText(date);
showDateDialog(); //**I want this showDateDialogue to update mTextMessage**//
return true;
case R.id.navigation_notifications:
mTextMessage.setText(R.string.menu_location);
return true;
}
return false;
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTextMessage = (TextView) findViewById(R.id.message);
BottomNavigationView navigation = (BottomNavigationView) findViewById(R.id.navigation);
navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener);
}
public void showDateDialog() {
DialogFragment CalFragment = new CalFragment();
CalFragment.show(getSupportFragmentManager(), "timePicker");
date = "Hello";
}
}
where CallFragement is in another class:
public class CalFragment extends DialogFragment
implements DatePickerDialog.OnDateSetListener {
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
// Use the current date as the default date in the picker
final Calendar c = Calendar.getInstance();
int year = c.get(Calendar.YEAR);
int month = c.get(Calendar.MONTH);
int day = c.get(Calendar.DAY_OF_MONTH);
// Create a new instance of DatePickerDialog and return it
return new DatePickerDialog(getActivity(), this, year, month, day);
}
public void onDateSet(DatePicker view, int year, int month, int day) {
// Do something with the date chosen by the user
SimpleDateFormat dateFormatter = new SimpleDateFormat("MM-dd-yyyy");
Date d = new Date(year, month, day);
String strDate = dateFormatter.format(d);
}
}
So, Basically, I want to use the value of this strDate in the mTextMessage! But, I am very very new to java and though this type of question is very common in SO, I can't figure out a solution.
Kindly Help.
UPDATE Hi, though I understand its a trivial question, but I have managed to move only a little in last 5 hour. I humbly request you to help a bit. Here is my updated code:
MainCativity.java
public class MainActivity extends AppCompatActivity
implements CalFragment.OnDateSelected{
private TextView mTextMessage;
String date = new SimpleDateFormat("yyyy-MM-dd", Locale.getDefault()).format(new Date());
private BottomNavigationView.OnNavigationItemSelectedListener mOnNavigationItemSelectedListener
= new BottomNavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
switch (item.getItemId()) {
case R.id.navigation_home:
mTextMessage.setText(R.string.menu_home);
return true;
case R.id.navigation_dashboard:
mTextMessage.setText(date);
showDateDialog();
mTextMessage.setText(date);
return true;
case R.id.navigation_notifications:
mTextMessage.setText(R.string.menu_location);
return true;
}
return false;
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTextMessage = (TextView) findViewById(R.id.message);
BottomNavigationView navigation = (BottomNavigationView) findViewById(R.id.navigation);
navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener);
}
public void showDateDialog() {
DialogFragment CalFragment = new CalFragment();
CalFragment.show(getSupportFragmentManager(), "timePicker");
date = "Hello";
}
}
and
CalFragment.java
public class CalFragment extends DialogFragment
implements DatePickerDialog.OnDateSetListener {
OnDateSelected mcallback;
public interface OnDateSelected {
public void NewStrDate(String strDate);
}
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
// Use the current date as the default date in the picker
final Calendar c = Calendar.getInstance();
int year = c.get(Calendar.YEAR);
int month = c.get(Calendar.MONTH);
int day = c.get(Calendar.DAY_OF_MONTH);
// Create a new instance of DatePickerDialog and return it
return new DatePickerDialog(getActivity(), this, year, month, day);
}
public void onDateSet(DatePicker view, int year, int month, int day) {
// Do something with the date chosen by the user
SimpleDateFormat dateFormatter = new SimpleDateFormat("MM-dd-yyyy");
Date d = new Date(year, month, day);
String strDate = dateFormatter.format(d);
mcallback.NewStrDate(strDate);
}
}
and this is giving error:
Error:(16, 8) error: MainActivity is not abstract and does not override abstract method NewStrDate(String) in OnDateSelected
