A ver si alguien me puede ayudar porque no entiendo nada. Cuando pulso el botón nuevo si estoy en la segunda pestaña el toast me muestra bien los 3 valores de cada fragment. El problema es que si estoy en el primero o en el tercero, me entra por el try dandome un null.
Pongo el código de lo que estoy haciendo por si alguien sabe cual es el problema
Main Activity
import android.app.ActionBar;
import android.app.FragmentTransaction;
import android.support.v4.app.FragmentActivity;
import android.support.v4.view.ViewPager;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.EditText;
import android.widget.Toast;
public class MainActivity extends FragmentActivity implements ActionBar.TabListener {
private ViewPager viewPager;
private TabAdapter tabAdapter;
private ActionBar actionBar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
viewPager = (ViewPager) findViewById(R.id.pager);
actionBar = getActionBar();
tabAdapter = new TabAdapter(getSupportFragmentManager());
viewPager.setAdapter(tabAdapter);
actionBar.setHomeButtonEnabled(false);
actionBar.setNavigationMode(ActionBar.NAVIGATION_M ODE_TABS);
actionBar.addTab(actionBar.newTab().setText("Fragment 1").setTabListener(this));
actionBar.addTab(actionBar.newTab().setText("Fragment 2").setTabListener(this));
actionBar.addTab(actionBar.newTab().setText("Fragment 3").setTabListener(this));
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.nuevo) {
try {
Fragment1 fragment_1 = (Fragment1) tabAdapter.instantiateItem(viewPager, 0);
Fragment2 fragment_2 = (Fragment2) tabAdapter.instantiateItem(viewPager, 1);
Fragment3 fragment_3 = (Fragment3) tabAdapter.instantiateItem(viewPager, 2);
EditText et_texto1 = (EditText) fragment_1.getView().findViewById(R.id.et_texto1);
EditText et_texto2 = (EditText) fragment_2.getView().findViewById(R.id.et_texto2);
EditText et_texto3 = (EditText) fragment_3.getView().findViewById(R.id.et_texto3);
Toast.makeText(this, "Texto 1: " + et_texto1.getText().toString() + " : Texto 2: " + et_texto2.getText().toString() + " : Texto 3: " + et_texto3.getText().toString(), Toast.LENGTH_SHORT).show();
return true;
} catch (Exception e){
Toast.makeText(this, "Error: " + e.getMessage(), Toast.LENGTH_SHORT).show();
return false;
}
}
return super.onOptionsItemSelected(item);
}
@Override
public void onTabSelected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
viewPager.setCurrentItem(tab.getPosition());
}
@Override
public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
}
@Override
public void onTabReselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
}
}
TabAdapter
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
public class TabAdapter extends FragmentPagerAdapter{
public TabAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return new Fragment1();
case 1:
return new Fragment2();
case 2:
return new Fragment3();
default:
return null;
}
}
@Override
public int getCount() {
return 3;
}
}
Fragment1
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class Fragment1 extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment1, container, false);
return view;
}
}
Fragment2
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class Fragment2 extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment2, container, false);
return view;
}
}
Fragment3
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class Fragment3 extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment3, container, false);
return view;
}
}
Por ultimo los layout:
activity_main
<android.support.v4.view.ViewPager xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent">
</android.support.v4.view.ViewPager>
fragment1
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/et_texto1" />
</LinearLayout>
fragment2
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/et_texto2" />
</LinearLayout>
fragment3
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/et_texto3" />
</LinearLayout>