android - Get id of TextView in Fragment from FragmentActivity in ViewPager

Question

I'm working with ViewPager with 3 Fragments and I want to change text of TextView in third page.

In that page I have a Buttonthat when its pressed, go to SD images to select one. When done, returns to page and want to update TextView with path of that image. The problem is that when I try to access that TextViewfrom FragmentActivityit is null.

Here is my code

SherlockFragmentActivity:

public class TabsFacturasActivity extends SherlockFragmentActivity {

    protected MyApplication myApplication;
    private static final int FILE_SELECT_CODE = 0;

    private MyAdapter mAdapter;
    private ViewPager mPager;
    private PageIndicator mIndicator;
    private TextView textViewImg;

    private int lecturas = 0;
    private SimpleDateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy"); 
    private boolean adjunto = false;
    private String filePath;
    private boolean esLecturaAT = false;

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

        // Get the application instance
        myApplication = (MyApplication)getApplication();

        //Need to get that view
        textViewImg = (TextView) findViewById(R.id.textViewUrlImgLectura);

        //Creamos la lista
        LinkedList<String> direcciones = new LinkedList<String>();
        ArrayList<TuplaCupsWS> dirs = myApplication.getUsuarioActual().getCups();
        for(int dir = 0; dir < myApplication.getUsuarioActual().getCups().size(); dir++) {
            direcciones.add(new String(dirs.get(dir).getDireccion()));
        }

        int tab = getIntent().getIntExtra("tab", 0);

        mAdapter = new MyAdapter(getSupportFragmentManager());

        mPager = (ViewPager)findViewById(R.id.pager);
        mPager.setAdapter(mAdapter);
        mPager.setCurrentItem(tab);

        mIndicator = (TitlePageIndicator)findViewById(R.id.indicator);
        mIndicator.setViewPager(mPager);

        getSupportActionBar().setDisplayShowTitleEnabled(false);
        getSupportActionBar().setIcon(R.drawable.logo_factorenergia_peque);

        /** Create an array adapter to populate dropdownlist */
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(
                getBaseContext(), android.R.layout.simple_spinner_dropdown_item, direcciones);

        /** Enabling dropdown list navigation for the action bar */
        getSupportActionBar().setNavigationMode(ActionBar.NAVIGATION_MODE_LIST);

        /** Defining Navigation listener */
        OnNavigationListener navigationListener = new OnNavigationListener() {

            @Override
            public boolean onNavigationItemSelected(int itemPosition, long itemId) {
                return false;
            }
        };

        /** Setting dropdown items and item navigation listener for the actionbar */
        getSupportActionBar().setListNavigationCallbacks(adapter, 
                (com.actionbarsherlock.app.ActionBar.OnNavigationListener) 
                navigationListener);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        switch (requestCode) {
            case FILE_SELECT_CODE:
            if (resultCode == RESULT_OK) {
                adjunto = true;
                // Get the Uri of the selected file 
                Uri uri = data.getData();
                // Get the path
                String path = "";
                try {
                    path = MyUtility.getPath(this, uri);
                } catch (URISyntaxException e) {
                    myApplication.throwException(this);
                    e.printStackTrace();
                }
                String imgName = path.split("/")[path.split("/").length-1];
                textViewImg.setText(imgName); //Here textViewImg is null
                filePath = path;
            }
            break;
        }
        super.onActivityResult(requestCode, resultCode, data);
    }

    //Method executed when Button is pressed
    public void examinar(View view) {
        mostrarFileChooser();       
    }

    private void mostrarFileChooser() {     
        Intent intent = new Intent(Intent.ACTION_PICK);
        intent.setType("image/*");

        try {
            startActivityForResult(intent, FILE_SELECT_CODE);
        } catch (android.content.ActivityNotFoundException ex) {
        }
    }

    private static class MyAdapter extends FragmentPagerAdapter {

        private String[] titles = { "VER FACTURAS", "VER CONSUMO", "INTRODUCIR LECTURA" };

        public MyAdapter(FragmentManager fragmentManager) {
            super(fragmentManager);
        }

        @Override
        public CharSequence getPageTitle(int position) {
            return titles[position];
        }

        @Override
        public Fragment getItem(int position) {
            switch (position) {
            case 0: // Fragment # 0
                return new FacturasActivity();
            case 1: // Fragment # 1
                return new ConsumoActivity();
            case 2:// Fragment # 2
                return new LecturaActivity();
            }
            //return new MyFragment();
            return null;
        }

        @Override
        public int getCount() {
            return titles.length;
        }
    }

}

fragment_pager.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"
    tools:context=".TabsFacturasActivity" >

    <com.viewpagerindicator.TitlePageIndicator
        android:id="@+id/indicator"
        android:padding="10dip"
        android:layout_height="wrap_content"
        android:layout_width="fill_parent" />

    <android.support.v4.view.ViewPager
        android:id="@+id/pager"
        android:layout_width="fill_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:background="#1184A4E8" />

</LinearLayout>

Answer 1

You cant access text view from fragment activity because its located on fragment and your fragment activity layout don't have any text view with this id. You have to access text view from your third fragment where you used it in its layout. Then access that object from your fragment activity.

in your fragment do something like this

TextView mTextView;
mTextView = (TextView)getView().findViewById(R.id.your_text_view);

Create a function like this

public void changeText(String mText)
{
mTextView.setText(mText);
}

In your activity result

//Do not create new object each time you set text. Use the same fragment object which you use for view pager.
        Your_Fragment mFragment;
         protected void onActivityResult(int requestCode, int resultCode, Intent data) {
                switch (requestCode) {
                    case FILE_SELECT_CODE:
                    if (resultCode == RESULT_OK) {

    //Set text from here
                mFragment.changeText(imgName);

               }