How to access Fragment's child views inside fragment's parent Activity?

Solution 1:

Note:

Directly accessing fragment's views outside fragment is not a good idea. You should use fragment callback interfaces to handle such cases and avoid bugs. The following way works but it is not recommended as it is not a good practice.

If you want to access the TextView of Fragment inside its parent Activity then you should define a method inside your Fragment class like this:

public class MyFragment extends Fragment {

    TextView mTextView;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.activity_main, container, false);
        mTextView = (TextView) view.findViewById(R.id.textView1);
        return view;
    }

    public void setTextViewText(String value){
        mTextView.setText(value);
    }


}

Now you can use this inside your Activity like this:

myFragment.setTextViewText("foo");

here myFragment is of type MyFragment.

If you want to access the whole TextView then you can define a method like this inside MyFragment.java:

public TextView getTextView1(){
    return mTextView;
}

By this you can access the TextView itself.

Hope this Helps. :)

Solution 2:

It is possible with following way:

Keep reference of inflated view in the Fragment like this :

public class MyFragment extends SherlockFragment{

MainMenuActivity activity;
public View view;
public MyFragment(){
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

    if ( getActivity() instanceof MainMenuActivity){
        activity = (MainMenuActivity) getActivity();
    }

    view = inflater.inflate(R.layout.aboutus, container, false);        
    return view;
}

}

Create a function in the Activity, like this:

 public class MainMenuActivity extends SherlockFragmentActivity {

 SherlockFragment fragment = null;

 public void switchContent(SherlockFragment fragment) {     
    this.fragment = fragment;
    getSupportFragmentManager()
    .beginTransaction()
    .replace(R.id.mainmenu, fragment)
    .commit();

    invalidateOptionsMenu();
}

Its purpose is to keep reference of current fragment. Whenever you wanna switch fragment, you call above function, like this (from fragment):

activity.switchContent( new MyFragment_2());

Now you've current fragment reference. So you can directly access Fragment's views in Activity like this: this.fragment.view

Solution 3:

You have no need of reference of Fragment view to get its components in Activity. As you can directly access layout components of a Fragment in parent Activity.

Simply you can access any component by this

findViewById(R.id.child_of_fragment_layout);

Solution 4:

In order to access the TextView or Button or whatever in your fragment you need to do the following:

public class BlankFragment extends Fragment {
public View view;
public TextView textView;
public Button button;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    view =inflater.inflate(R.layout.fragment_blank, container, false);
    textView = (TextView)view.getRootView().findViewById(R.id.textView_fragment1);
    return view;
}

public void changeTextOfFragment(String text){
    textView.setText(text);
    view.setBackgroundResource(R.color.colorPrimaryDark);
}

Once that is done in your MainActivity or any other where you want to access your TextView from your Fragment you should make sure to set up the fragment in your OnCreate() method other ways it will most likely throw nullPointer. So your activity where you want to change the TextView should look smth like this:

public class MainActivity extends AppCompatActivity {
private Button button1;
private FragmentManager fragmentManager;
private FragmentTransaction fragmentTransaction;
BlankFragment blankFragment = new BlankFragment();

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    button1 = (Button)findViewById(R.id.button1);
    changeFragment();

    fragmentManager = getFragmentManager();
    fragmentTransaction = fragmentManager.beginTransaction();
    fragmentTransaction.replace(R.id.fragment1,blankFragment);
    fragmentTransaction.commit();
}

private void changeFragment(){
    button1.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            blankFragment.changeTextOfFragment("Enter here the text which you want to be displayed on your Updated Fragment");

        }
    });
}

Hope this helps :)