I'm trying to implent the next code in Android Studio and it does not work.
I want to pass from a Fragment (GalleryFragment) to an Activity (postropa) with a button.
I have linked the botton with the function (BotonPulsado) and I don't know what is wrong (In the design view).
Design View
Code:
import (...)
public class GalleryFragment extends Fragment {
private GalleryViewModel galleryViewModel;
public View onCreateView(#NonNull LayoutInflater inflater,
ViewGroup container, Bundle savedInstanceState) {
galleryViewModel =
ViewModelProviders.of(this).get(GalleryViewModel.class);
View root = inflater.inflate(R.layout.fragment_gallery, container, false);
final TextView textView = root.findViewById(R.id.text_gallery);
galleryViewModel.getText().observe(getViewLifecycleOwner(), new Observer<String>() {
#Override
public void onChanged(#Nullable String s) {
textView.setText(s);
}
});
return root;
}
public void BotonPulsado(View view) {
Intent intent = new Intent(getContext(), postropa.class);
startActivity(intent);
}
}
You should create Button variаble as a class field.
private GalleryViewModel galleryViewModel;
Button button; <<-------
After that you need to define it in method onCreateView()
button = (Button) findViewById(R.id.button2);
And set onClickListener() on this button to handle the call.
There you must call the method that starts the activity.
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
BotonPulsado();
}
});
Your final code:
import (...)
public class GalleryFragment extends Fragment {
private GalleryViewModel galleryViewModel;
Button button;
public View onCreateView(#NonNull LayoutInflater inflater,
ViewGroup container, Bundle savedInstanceState) {
galleryViewModel =
ViewModelProviders.of(this).get(GalleryViewModel.class);
View root = inflater.inflate(R.layout.fragment_gallery, container, false);
final TextView textView = root.findViewById(R.id.text_gallery);
galleryViewModel.getText().observe(getViewLifecycleOwner(), new Observer<String>() {
#Override
public void onChanged(#Nullable String s) {
textView.setText(s);
}
});
button = (Button) findViewById(R.id.button2);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
BotonPulsado();
}
});
return root;
}
public void BotonPulsado() {
Intent intent = new Intent(getContext(), postropa.class);
startActivity(intent);
}
}
Related
I know there are similar questions but I couldn't find an answer to solve my problem.
I have a DialogUpdateEmail which I want to be opened from ProfileFragment. In the dialog I want to enter my new email and send it to my ProfileFragment in order to change it also in the database.
ProfileFragment.java :
import androidx.fragment.app.Fragment;
public class ProfileFragment extends Fragment implements SendInputEmail {
public static final int PROFILE_FRAGMENT = 1;
private static final String TAG = "ProfileFragment";
private TextView TVHello, TVUsernameMessage, TVusernameinfo, TVemailinfo, TVbirthdate;
public void sendInput(String input) {
Log.d(TAG, "sendInput: found incoming input: " + input);
TVemailinfo.setText(input);
}
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_profile, container, false);
Button Bsignout = (Button) v.findViewById(R.id.signoutbutton);
Button Beditusername = (Button) v.findViewById(R.id.editusernamebutton);
Button Beditemail = (Button) v.findViewById(R.id.editemailbutton);
Beditemail.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Log.d(TAG, "onClick: opening email dialog");
DialogUpdateEmail dialog = new DialogUpdateEmail();
dialog.setTargetFragment(ProfileFragment.this,PROFILE_FRAGMENT);
dialog.show(getActivity().getFragmentManager(), "DialogUpdateEmail");
}
});
return v;
}
DialogUpdateEmail.java :
public class DialogUpdateEmail extends DialogFragment implements SendInputEmail {
private static final String TAG = "DialogUpdateEmail";
SendInputEmail mHost = (SendInputEmail)getTargetFragment();
public View onCreateView(final LayoutInflater inflater, #Nullable ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.popup, container, false);
EditText UpdateEmail = (EditText) view.findViewById(R.id.emailinfoupdate);
Button Beditemail = (Button) view.findViewById(R.id.updatesavebutton);
Button Bcancelemail = (Button) view.findViewById(R.id.updatecancelbutton);
Beditemail.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Log.d(TAG, "onClick: capturing input.");
String input = UpdateEmail.getText().toString();
Log.d(TAG, "input : "+input);
mHost.sendInput(input);
getDialog().dismiss();
}
});
return view ;
}
public void onAttach(Context context) {
super.onAttach(context);
try{
mHost = (SendInputEmail) getTargetFragment();
}catch (ClassCastException e){
Log.e(TAG, "onAttach: ClassCastException : " + e.getMessage() );
}
}
#Override
public void sendInput(String input) {
}
}
SendInputEmail Interface :
public interface SendInputEmail {
void sendInput(String input);
}
My problem is that I have an error when I try to use setTargetFragment in ProfileFragment. It says that Profile Fragment is not a Fragment, I really don't know why.
From doc in here :
public class DialogUpdateEmail extends DialogFragment {
private DialogEditListener listener;
#NonNull
#Override
public Dialog onCreateDialog(#Nullable Bundle savedInstanceState) {
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
// Get the layout inflater
LayoutInflater inflater = requireActivity().getLayoutInflater();
// Inflate and set the layout for the dialog
// Pass null as the parent view because its going in the dialog layout
View view = inflater.inflate(R.layout.popup, null);
builder.setView(view);
EditText UpdateEmail = (EditText) view.findViewById(R.id.emailinfoupdate);
Button Beditemail = (Button) view.findViewById(R.id.updatesavebutton);
Button Bcancelemail = (Button) view.findViewById(R.id.updatecancelbutton);
Beditemail.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (listener != null) {
listener.onDialogEditClick(UpdateEmail.getText().toString());
DialogUpdateEmail.this.getDialog().dismiss();
}
}
});
Bcancelemail.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
DialogUpdateEmail.this.getDialog().cancel();
}
});
return builder.create();
}
public interface DialogEditListener {
void onDialogEditClick(String email);
}
public void setListener(DialogEditListener listener) {
this.listener = listener;
}
}
We send the email from the dialog to the fragment using the observer/listener pattern.
And in your ProfileFragment just implement DialogEditListener and subscribe it to listen for click button in the dialog like so:
public class ProfileFragment extends Fragment
implements SendInputEmail, DialogUpdateEmail.DialogEditListener {
public static final int PROFILE_FRAGMENT = 1;
private static final String TAG = "ProfileFragment";
private TextView TVHello, TVUsernameMessage, TVusernameinfo, TVemailinfo, TVbirthdate;
public void sendInput(String input) {
Log.d(TAG, "sendInput: found incoming input: " + input);
TVemailinfo.setText(input);
}
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_profile, container, false);
Button Bsignout = (Button) v.findViewById(R.id.signoutbutton);
Button Beditusername = (Button) v.findViewById(R.id.editusernamebutton);
Button Beditemail = (Button) v.findViewById(R.id.editemailbutton);
Beditemail.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Log.d(TAG, "onClick: opening email dialog");
//show your dialog
DialogUpdateEmail dialogUpdateEmail = new DialogUpdateEmail();
dialogUpdateEmail.setListener(ProfileFragment.this);
dialogUpdateEmail.show(getActivity().getSupportFragmentManager(), "DialogUpdateEmail");
}
});
return v;
}
#Override
public void onDialogEditClick(String email) {
//use your email here
Toast.makeText(getContext(), "My email: " + email, Toast.LENGTH_SHORT).show();
}
}
I created my test project where i code to communicate between two fragments but actully I want to access activity from fragment.
Here is code to connect fragment to fragment, its working absolutely right without any error but now i want to change this code to connect activity from fragment instead of fragment to fragment communication.
So Please change this code to access activities from fragment. I stuck on this issue for than a week.So Guys please resolve this.
here is my mainaactivity:
public class MainActivity extends AppCompatActivity implements FragmentA.FragmentAListener, FragmentB.FragmentBListener {
private FragmentA fragmentA;
private FragmentB fragmentB;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
fragmentA = new FragmentA();
fragmentB = new FragmentB();
getSupportFragmentManager().beginTransaction()
.replace(R.id.container_a, fragmentA)
.replace(R.id.container_b, fragmentB)
.commit();
}
#Override
public void onInputASent(CharSequence input) {
fragmentB.updateEditText(input);
}
#Override
public void onInputBSent(CharSequence input) {
fragmentA.updateEditText(input);
}
Here is my FragmentA.java:
public class FragmentA extends Fragment {
private FragmentAListener listener;
private EditText editText;
private Button buttonOk;
public interface FragmentAListener {
void onInputASent(CharSequence input);
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_a, container, false);
editText = v.findViewById(R.id.edit_text);
buttonOk = v.findViewById(R.id.button_ok);
buttonOk.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
CharSequence input = editText.getText();
listener.onInputASent(input);
}
});
return v;
}
public void updateEditText(CharSequence newText) {
editText.setText(newText);
}
#Override
public void onAttach(Context context) {
super.onAttach(context);
if (context instanceof FragmentAListener) {
listener = (FragmentAListener) context;
} else {
throw new RuntimeException(context.toString()
+ " must implement FragmentAListener");
}
}
#Override
public void onDetach() {
super.onDetach();
listener = null;
}
}
Here is my FragmentB.java:
public class FragmentB extends Fragment {
private FragmentBListener listener;
private EditText editText;
private Button buttonOk;
public interface FragmentBListener {
void onInputBSent(CharSequence input);
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_b, container, false);
editText = v.findViewById(R.id.edit_text);
buttonOk = v.findViewById(R.id.button_ok);
buttonOk.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
CharSequence input = editText.getText();
listener.onInputBSent(input);
}
});
return v;
}
public void updateEditText(CharSequence newText) {
editText.setText(newText);
}
#Override
public void onAttach(Context context) {
super.onAttach(context);
if (context instanceof FragmentBListener) {
listener = (FragmentBListener) context;
} else {
throw new RuntimeException(context.toString()
+ " must implement FragmentBListener");
}
}
#Override
public void onDetach() {
super.onDetach();
listener = null;
}
}
Here is my Fertilizers.java file which i want to access from FragmentA.:
public class Fertilizers extends AppCompatActivity {
RecyclerView mRecyclerView;
List<FertilizerData> myFertilizersList;
FertilizerData mFertilizersData;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_fertilizers);
mRecyclerView = (RecyclerView)findViewById(R.id.recyclerView);
GridLayoutManager gridLayoutManager;
gridLayoutManager = new GridLayoutManager(Fertilizers.this, 1);
mRecyclerView.setLayoutManager(gridLayoutManager);
myFertilizersList = new ArrayList<>();
mFertilizersData = new FertilizerData("Urea Fertilizer","Urea is a concent","Rs.1900",R.drawable.urea);
myFertilizersList.add(mFertilizersData);
myFertilizersList.add(mFertilizersData); }
}
please write here a block of code to call Fertilzers Activity from FragmentA, I,ll be very thankful to you.
Calling getActivity() in your fragment gives you the calling activity so if MainActivity started your fragment then you would do
(MainActivity(getActivity())).something_from_your_main_activity
Solution found by itself regarding this issue.
FragmentHome.java class should look like this:
public class FragmentHome extends Fragment {
private Button button;
public FragmentHome(){
}
public interface OnMessageReadListener
{
public void onMessageRead(String message);
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_home, container, false);
button = (Button)v.findViewById(R.id.bn);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent = new Intent(getActivity(), Fertilizers.class);
intent.putExtra("some"," some data");
startActivity(intent);
}
});
return v;
}
}
FertilizersActivity.java should look like this:
public class Fertilizers extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_fertilizers);
Bundle bundle = getIntent().getExtras();
if (bundle != null){
if(bundle.getStringArrayList("some") !=null){
Toast.makeText(getApplicationContext(),"data:" + bundle.getStringArrayList("some"),Toast.LENGTH_LONG).show();
}
}
}
}
I have the error noted in the title: error: not an enclosing class: Context
I already tried in some other forums to solve this problem but they couldn't help, I checked youtube and other questions on stackoverflow but couldn't find an answer to this problem.
My code looks like this:
public class TermineFragment extends Fragment {
private Button button;
Context c;
#Override
public void onAttach(Context c) {
super.onAttach(c);
Context context = c;
}
#Override
public void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Nullable
#Override
public View onCreateView(#NonNull final LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.activity_3, container, false);
button = view.findViewById(R.id.button1);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(getActivity(Context.this, AnmeldungButton.class));
startActivity(intent);
}
});
return view;
}
}
This produces the error:
error: not an enclosing class: Context
Which comes from the line:
Intent intent = new Intent(getActivity(Context.this,AnmeldungButton.class));
I want that my button in the Fragment AnmeldungButton.java is I mean in the Activity but I hope you understand me ...
You can use getContext() for start activity in fragment
Intent intent = new Intent(getContext(), AnmeldungButton.class);
startActivity(intent);
Use this code
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(getActivity(),AnmeldungButton.class);
startActivity(intent);
}you a
});
Here is the problem you are using are passing parameter in the wrong way.
Intent(Context packageContext, Class<?> cls)
public class TermineFragment extends Fragment {
Context c;
#Override
public void onAttach(Context c) {
super.onAttach(c);
this.c = c; //this is one of the best way to get context of the activity to which the particular activity is associated with
}
#Nullable
#Override
public View onCreateView(#NonNull final LayoutInflater inflater, #Nullable
ViewGroup container, #Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.activity_3, container, false);
button = view.findViewById(R.id.button1);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(c,AnmeldungButton.class);//Pass the context like this.
startActivity(intent);
});
return view;
}
}
Currently I have a fragment_one.xml which has 5 CardViews on it and and each card has a Button on it that is meant to go to separate XML pages (Lesson_One,Lesson_Two etc...) but with the code I have in OneFragment.java, both buttons are opening Lesson_Two
How I can I fix this? Here is my code
FragmentOne.java
public class OneFragment extends Fragment{
Intent intent;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View root = inflater.inflate(R.layout.fragment_one, container, false);
intent = new Intent(getActivity(), LessonOne.class);
final Button button = (Button) root.findViewById(R.id.button1);
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
startActivity(intent);
}
});
intent = new Intent(getActivity(), LessonTwo.class);
final Button button2 = (Button) root.findViewById(R.id.button2);
button2.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
startActivity(intent);
}
});
return root;
}
}
You're assigning intent twice, effectively overwriting the first intent with the second.
So no matter which click event is triggered LessonTwo.class is the activity that is started.
A simple fix would be to create the intents inside the click handlers like
public class OneFragment extends Fragment{
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View root = inflater.inflate(R.layout.fragment_one, container, false);
final Button button = (Button) root.findViewById(R.id.button1);
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
startActivity(new Intent(getActivity(), LessonOne.class));
}
});
final Button button2 = (Button) root.findViewById(R.id.button2);
button2.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
startActivity(new Intent(getActivity(), LessonTwo.class););
}
});
return root;
}
}
This makes it explicit which click handler starts what activity
Alternative answer - implement the click listener on the class itself.
This cleans up the onCreateView method. You also don't need to "capture" the buttons to set their listeners.
public class OneFragment extends Fragment implements View.OnClickListener {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View root = inflater.inflate(R.layout.fragment_one, container, false);
root.findViewById(R.id.button1).setOnClickListener(this);
root.findViewById(R.id.button2).setOnClickListener(this);
return root;
}
#Override
public void onClick(View v) {
Class clz = null;
switch (v.getId()) {
case R.id.button1:
clz = LessonOne.class;
case R.id.button2;
clz = LessonTwo.class;
}
if (clz != null) startActivity(new Intent(getActivity(), clz));
}
}
I have a layout with a buttons. I use FragmentActivity:
public class slidepage extends FragmentActivity {
private static final int NUM_PAGES = 5;
private ViewPager mPager;
private PagerAdapter mPagerAdapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_screen_slide);
mPager = (ViewPager) findViewById(R.id.pager);
mPagerAdapter = new ScreenSlidePagerAdapter(getSupportFragmentManager());
mPager.setAdapter(mPagerAdapter);
Button Back = (Button) findViewById(R.id.back);
Back.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
onBackPressed();
}
});
}
}
slide class:
public class slider extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
ViewGroup view;
if(GlobalConfig.tryb) {
view = (ViewGroup) inflater.inflate(R.layout.n_podglad, container, false);
} else {
view = (ViewGroup) inflater.inflate(R.layout.d_podglad, container, false);
}
/* Powrót */
Button Back = (Button) view.findViewById(R.id.back);
Back.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
//onBackPressed();
}
});
return view;
}
}
Unfortunately my button not works. I receive null reference in log. What is wrong? How can I set OnClickListener on my buttons in viewpager?
Inside ScreenSlidePagerAdapter in instantiateItem method write your button click not in your slidepage
#Override
public Object instantiateItem(View container, int position) {
// TODO Auto-generated method stub
LayoutInflater inflater = (LayoutInflater) act
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View layout= inflater.inflate(R.layout.pager_layout, null);
Button Back= (Button) layout.findViewById(R.id.back);
Back.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
onBackPressed();
}
});
return layout;
}