I can't get data from edittext in fragment after I replace fragment

Question

I have two fragment with edittext, data from first edittext I gets but after I call second fragment I can't get data from edittext in second fragment. The Logcat said me that data from second edittext is void.

This is a first fragment class

package com.example.n;

import android.annotation.TargetApi;
import android.app.Fragment;
import android.os.Build;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.EditText;


@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public class FragmentAdd extends Fragment {
    EditText et1;

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                 Bundle savedInstanceState) {
            View rootView = inflater.inflate(R.layout.frag_add, container, false);
            et1 = (EditText) rootView.findViewById(R.id.editText);
            return rootView ;
        }

}

This is a second fragment class

    package com.example.n;

import android.annotation.TargetApi;
import android.app.Fragment;
import android.os.Build;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.EditText;


@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public class FragmentAdd2 extends Fragment {
    EditText et2;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.frag_add2, container, false);
        et2 = (EditText) rootView.findViewById(R.id.editText2);

        return rootView ;
    }

    public String getEditText(){
        /*FragmentAdd2 fragmentAdd3 = new FragmentAdd2();
        String data =  fragmentAdd3.et2.getText().toString();*/
        String data = et2.getText().toString();
        return data;
    }

}

This is a part of main class

@TargetApi(Build.VERSION_CODES.HONEYCOMB)
    public void onClick(View view){
    FragmentAdd fragmentAdd = new FragmentAdd(); 
    String data =  fragmentAdd.et1.getText().toString();
}

@TargetApi(Build.VERSION_CODES.HONEYCOMB)
    public void onClick(View view){
    FragmentAdd2 fragmentAdd2 = new FragmentAdd2(); 
    String data =  fragmentAdd2.et2.getText().toString();
}

*LogCat*


java.lang.IllegalStateException: Could not execute method of the activity
Caused by: java.lang.reflect.InvocationTargetException
        at java.lang.reflect.Method.invoke(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:372)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.text.Editable android.widget.EditText.getText()' on a null object reference

Answer 1

FragmentAdd2 fragmentAdd2 = new FragmentAdd2(); //new fragment instance
String data =  fragmentAdd2.et2.getText().toString();

The code above points to a different Fragment, if you want to get Text from the Fragment you need to point to the Fragment you added to the Transaction, and that will get rid of the NPE to get your Fragment you can use Tag and FragmentManager

Suppose when you added the Fragment you use Transaction.add(int,Fragment,tag) you can now call your Fragment with FragmentManager.findFragmentByTag(tag) after that since you want your EditText you can cast it to your preferred Fragment Class .ie. FragmentAdd2 or FragmentAdd then you can retrieve your stuff.

Hope it helps

Answer 2

The correct way of accessing a fragment method from activity is

ExampleFragment fragment = (ExampleFragment) getFragmentManager().findFragmentById(R.id.example_fragment);
fragment.methodName(); 

or

ExampleFragment fragment = (ExampleFragment) getFragmentManager().findFragmentByTag("Your Tag");
fragment.methodName(); 

"Your Tag" is the tag that you passed in the parameter when you added or replaced a Fragment.