how to call method of one fragment from another fragment class in android

I want to call a method of FragmentB (Class) from a fragmentA I tried by making a object of fragmentb in fragmentA (class) but it's not working
here is the code of fragmentA in this class I have a method through which I will call the method of FragmentB class

adddata.setOnClickListener(
new View.OnClickListener() {
@Override
public void onClick(View v) {
boolean isInserted = myDb.addalldata(monthly_income.getText().toString(),
room_rent.getText().toString(),
mess_rent.getText().toString());
if (isInserted = true)
Toast.makeText(getActivity().getBaseContext(), "Data Inserted", Toast.LENGTH_LONG).show();
else
Toast.makeText(getActivity().getBaseContext(), "Data not Inserted", Toast.LENGTH_LONG).show();
}
}
);


I want to call this method of fragmentB

public void show() {
Cursor res = myDb.getAllData();
StringBuffer buffer = new StringBuffer();
while (res.moveToNext()) {
displayresult.setText( buffer.append( res.getString(1)));
}
}


I tried by writing this code in method of fragmentA but am getting error

FragmentA fragment=
(FragmentA)getSupportFragmentManager().findFragmentById(R.id.pageview2);
((FragmentA)fragment).show();


3 Answers
3

Try this solution:

((FragmentA) getActivity()
.getSupportFragmentManager()
.findFragmentById(R.id.pageview2)
).show();


i wanna call method of fragmentB so i used FragmentB , in ur code but wheni clicked my app stopped working
– Arslan Ali Awan
Aug 19 '15 at 16:14

can you post the crash report that is shown in the logcat
– Vindhya Pratap Singh
Aug 19 '15 at 16:19

com.awan.app.hostelbudgetfriend.FragmentA$1.onClick(FragmentA.java:60) at android.view.View.performClick(View.java:4753) at android.view.View$PerformClick.run(View.java:19567) at android.os.Handler.handleCallback(Handler.java:733) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:146) at android.app.ActivityThread.main(ActivityThread.java:5635) at java.lang.reflect.Method.invokeNative(Native Method)
– Arslan Ali Awan
Aug 19 '15 at 16:24

com.awan.app.hostelbudgetfriend.FragmentA$1.onClick(FragmentA.java:60) at just above you first line you will get the exact exception is it Null pointer exception?
– Vindhya Pratap Singh
Aug 19 '15 at 16:26

yes exactly , null pointer exception
– Arslan Ali Awan
Aug 19 '15 at 16:28

You can create static varibales like this

static FragmentB f;

public static FragmentB newInstance(String title) {
FragmentB f = new FragmentB();
Bundle b = new Bundle();
b.putString(ARG_STATION_TITLE, title);
f.setArguments(b);
return f;
}


You can use the getInstance() method to get the instance of fragmentB

public static FragmentB getInstance(){
return f;
}


Call like this FragmentB.getInstance().methodinFragmentB();

FragmentB.getInstance().methodinFragmentB();

can u explain where i have to write this code , imean in some method ?
– Arslan Ali Awan
Aug 19 '15 at 16:08

can u show where your fragmentTransaction takes place from fragmenta to fragmentb
– sunil sunny
Aug 19 '15 at 16:18

actually in fragmentA i take some values , and in fragment b am showing those values , so for showing updating db values in fragment b i call a method of fragmentB (so automatically when user add some values in fragmentA it automatically shows updated values in fragmentB)
– Arslan Ali Awan
Aug 19 '15 at 16:21

In FragmentA class you can do the following code:-

private static FragmentA instance = null;

@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
instance = this;
}

public static FragmentA getInstance() {
return instance;
}


And in FragmentB class you can call the method as follows:

FragmentA.getInstance().show();


How does this answer give a better solution to the original question?
– Giovanni Lovato
Jun 28 at 16:19

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