Risposte:
Usa a Bundle. Ecco un esempio:
Fragment fragment = new Fragment();
Bundle bundle = new Bundle();
bundle.putInt(key, value);
fragment.setArguments(bundle);Il pacchetto ha inserito metodi per molti tipi di dati. Vedi questo
Quindi, nel tuo Fragment, recupera i dati (ad esempio nel onCreate()metodo) con:
Bundle bundle = this.getArguments();
if (bundle != null) {
int myInt = bundle.getInt(key, defaultValue);
}Per estendere ulteriormente la risposta precedente, come stava dicendo Ankit, per oggetti complessi è necessario implementare Serializable. Ad esempio, per l'oggetto semplice:
public class MyClass implements Serializable {
private static final long serialVersionUID = -2163051469151804394L;
private int id;
private String created;
}In you FromFragment:
Bundle args = new Bundle();
args.putSerializable(TAG_MY_CLASS, myClass);
Fragment toFragment = new ToFragment();
toFragment.setArguments(args);
getFragmentManager()
.beginTransaction()
.replace(R.id.body, toFragment, TAG_TO_FRAGMENT)
.addToBackStack(TAG_TO_FRAGMENT).commit();nel tuo ToFragment:
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
Bundle args = getArguments();
MyClass myClass = (MyClass) args
.getSerializable(TAG_MY_CLASS);getArguments () restituisce null perché "Non riceve nulla"
Prova questo codice per gestire questa situazione
if(getArguments()!=null)
{
int myInt = getArguments().getInt(key, defaultValue);
}Codice completo di passaggio dei dati usando frammento in frammento
Fragment fragment = new Fragment(); // replace your custom fragment class
Bundle bundle = new Bundle();
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
bundle.putString("key","value"); // use as per your need
fragment.setArguments(bundle);
fragmentTransaction.addToBackStack(null);
fragmentTransaction.replace(viewID,fragment);
fragmentTransaction.commit();Nella classe di frammenti personalizzati
Bundle mBundle = new Bundle();
mBundle = getArguments();
mBundle.getString(key); // key must be same which was given in first fragmentSolo per estendere le risposte precedenti - potrebbe aiutare qualcuno. Se getArguments()ritorni null, mettilo al onCreate()metodo e non al costruttore del tuo frammento:
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
int index = getArguments().getInt("index");
} First Fragment Sending String To Next Fragment
public class MainActivity extends AppCompatActivity {
private Button Add;
private EditText edt;
FragmentManager fragmentManager;
FragClass1 fragClass1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Add= (Button) findViewById(R.id.BtnNext);
edt= (EditText) findViewById(R.id.editText);
Add.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
fragClass1=new FragClass1();
Bundle bundle=new Bundle();
fragmentManager=getSupportFragmentManager();
fragClass1.setArguments(bundle);
bundle.putString("hello",edt.getText().toString());
FragmentTransaction fragmentTransaction=fragmentManager.beginTransaction();
fragmentTransaction.add(R.id.activity_main,fragClass1,"");
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();
}
});
}
}
Next Fragment to fetch the string.
public class FragClass1 extends Fragment {
EditText showFrag1;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view=inflater.inflate(R.layout.lay_frag1,null);
showFrag1= (EditText) view.findViewById(R.id.edtText);
Bundle bundle=getArguments();
String a=getArguments().getString("hello");//Use This or The Below Commented Code
showFrag1.setText(a);
//showFrag1.setText(String.valueOf(bundle.getString("hello")));
return view;
}
}
I used Frame Layout easy to use.
Don't Forget to Add Background color or else fragment will overlap.
This is for First Fragment.
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:background="@color/colorPrimary"
tools:context="com.example.sumedh.fragmentpractice1.MainActivity">
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/editText" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:id="@+id/BtnNext"/>
</FrameLayout>
Xml for Next Fragment.
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:background="@color/colorAccent"
android:layout_height="match_parent">
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/edtText"/>
</LinearLayout>Dalla classe di attività:
Invia i dati utilizzando gli argomenti bundle al frammento e carica il frammento
Fragment fragment = new myFragment();
Bundle bundle = new Bundle();
bundle.putString("pName", personName);
bundle.putString("pEmail", personEmail);
bundle.putString("pId", personId);
fragment.setArguments(bundle);
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,
fragment).commit();Dalla classe myFragment:
Ottieni gli argomenti dal bundle e impostali su XML
Bundle arguments = getArguments();
String personName = arguments.getString("pName");
String personEmail = arguments.getString("pEmail");
String personId = arguments.getString("pId");
nameTV = v.findViewById(R.id.name);
emailTV = v.findViewById(R.id.email);
idTV = v.findViewById(R.id.id);
nameTV.setText("Name: "+ personName);
emailTV.setText("Email: "+ personEmail);
idTV.setText("ID: "+ personId);Ecco come si usa il bundle:
Bundle b = new Bundle();
b.putInt("id", id);
Fragment frag= new Fragment();
frag.setArguments(b);recuperare valore dal bundle:
bundle = getArguments();
if (bundle != null) {
id = bundle.getInt("id");
}Il tuo frammento di input
public class SecondFragment extends Fragment {
EditText etext;
Button btn;
String etex;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.secondfragment, container, false);
etext = (EditText) v.findViewById(R.id.editText4);
btn = (Button) v.findViewById(R.id.button);
btn.setOnClickListener(mClickListener);
return v;
}
View.OnClickListener mClickListener = new View.OnClickListener() {
@Override
public void onClick(View v) {
etex = etext.getText().toString();
FragmentTransaction transection = getFragmentManager().beginTransaction();
Viewfragment mfragment = new Viewfragment();
//using Bundle to send data
Bundle bundle = new Bundle();
bundle.putString("textbox", etex);
mfragment.setArguments(bundle); //data being send to SecondFragment
transection.replace(R.id.frame, mfragment);
transection.isAddToBackStackAllowed();
transection.addToBackStack(null);
transection.commit();
}
};
}frammento di vista
public class Viewfragment extends Fragment {
TextView txtv;
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.viewfrag,container,false);
txtv = (TextView) v.findViewById(R.id.textView4);
Bundle bundle=getArguments();
txtv.setText(String.valueOf(bundle.getString("textbox")));
return v;
}
}Se stai usando il grafico per la navigazione tra i frammenti puoi farlo: Dal frammento A:
Bundle bundle = new Bundle();
bundle.putSerializable(KEY, yourObject);
Navigation.findNavController(view).navigate(R.id.contactExtendedFragment, bundle);Per frammentare B:
Bundle bundle = getArguments();
contact = (DISContact) bundle.getSerializable(KEY);Ovviamente il tuo oggetto deve implementare Serializable