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Communicating between Activity and ListFragment not works (Incompatible types)

How do I pass data between Activities in Android application?Example: Communication between Activity and Service using MessagingUpdate ViewPager dynamically?okHttp :why my application is crashing didnt get responseCommunication from Activity to Fragment with ViewPagerImplementing Floating Action Button on a Fragment ClassHow to use findViewById in a public class ItemThreeFragment extends Fragmentwhen mesg box exits it returns to prevoius activytyThis use Navigation Drawer, and use Tab, and use Fragment. how communication between FragmentActivity and Fragment?I want to display image from internet from main activity to another activity?

0

Trying to communicate between Activity and ListFragment exactly like in docs.

But when I define interface:

 public class HeadlinesFragment extends ListFragment {
 OnHeadlineSelectedListener callback;

 public void setOnHeadlineSelectedListener(Activity activity) 
 callback = activity;
 

 // Container Activity must implement this interface
 public interface OnHeadlineSelectedListener 
 public void onArticleSelected(int position);
 

I catch error "Incompatible types." here: callback = activity;

UPD: I attach it here:

public class MainActivity extends AppCompatActivity
 implements MainFragment.OnHeadlineSelectedListener {

 @Override
 public void onAttachFragment(Fragment fragment) 
 if (fragment instanceof MainFragment) 
 MainFragment headlinesFragment = (MainFragment) fragment;
 headlinesFragment.setOnHeadlineSelectedListener(this);
 
 

 @Override
 public void onArticleSelected(int position) 

 MenuFragment newFragment = new MenuFragment();
 Bundle bundle = new Bundle();
 bundle.putInt("Integer", position);
 newFragment.setArguments(bundle);

 

android android-fragments callback

share|improve this question

edited Mar 22 at 5:51

Vadim Bugakov

asked Mar 21 at 20:36

Vadim BugakovVadim Bugakov

65

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Can you post the activity where you attach it
  
  – Yassine BELDI
  Mar 21 at 20:42
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @YassineBELDI done
  
  – Vadim Bugakov
  Mar 22 at 5:52
  

  
  
  
  

add a comment | 

0

Trying to communicate between Activity and ListFragment exactly like in docs.

But when I define interface:

 public class HeadlinesFragment extends ListFragment {
 OnHeadlineSelectedListener callback;

 public void setOnHeadlineSelectedListener(Activity activity) 
 callback = activity;
 

 // Container Activity must implement this interface
 public interface OnHeadlineSelectedListener 
 public void onArticleSelected(int position);
 

I catch error "Incompatible types." here: callback = activity;

UPD: I attach it here:

public class MainActivity extends AppCompatActivity
 implements MainFragment.OnHeadlineSelectedListener {

 @Override
 public void onAttachFragment(Fragment fragment) 
 if (fragment instanceof MainFragment) 
 MainFragment headlinesFragment = (MainFragment) fragment;
 headlinesFragment.setOnHeadlineSelectedListener(this);
 
 

 @Override
 public void onArticleSelected(int position) 

 MenuFragment newFragment = new MenuFragment();
 Bundle bundle = new Bundle();
 bundle.putInt("Integer", position);
 newFragment.setArguments(bundle);

 

android android-fragments callback

share|improve this question

edited Mar 22 at 5:51

Vadim Bugakov

asked Mar 21 at 20:36

Vadim BugakovVadim Bugakov

65

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Can you post the activity where you attach it
  
  – Yassine BELDI
  Mar 21 at 20:42
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @YassineBELDI done
  
  – Vadim Bugakov
  Mar 22 at 5:52
  

  
  
  
  

add a comment | 

Trying to communicate between Activity and ListFragment exactly like in docs.

But when I define interface:

 public class HeadlinesFragment extends ListFragment {
 OnHeadlineSelectedListener callback;

 public void setOnHeadlineSelectedListener(Activity activity) 
 callback = activity;
 

 // Container Activity must implement this interface
 public interface OnHeadlineSelectedListener 
 public void onArticleSelected(int position);
 

I catch error "Incompatible types." here: callback = activity;

UPD: I attach it here:

public class MainActivity extends AppCompatActivity
 implements MainFragment.OnHeadlineSelectedListener {

 @Override
 public void onAttachFragment(Fragment fragment) 
 if (fragment instanceof MainFragment) 
 MainFragment headlinesFragment = (MainFragment) fragment;
 headlinesFragment.setOnHeadlineSelectedListener(this);
 
 

 @Override
 public void onArticleSelected(int position) 

 MenuFragment newFragment = new MenuFragment();
 Bundle bundle = new Bundle();
 bundle.putInt("Integer", position);
 newFragment.setArguments(bundle);

 

android android-fragments callback

share|improve this question

edited Mar 22 at 5:51

Vadim Bugakov

asked Mar 21 at 20:36

Vadim BugakovVadim Bugakov

65

 public class HeadlinesFragment extends ListFragment {
 OnHeadlineSelectedListener callback;

 public void setOnHeadlineSelectedListener(Activity activity) 
 callback = activity;
 

 // Container Activity must implement this interface
 public interface OnHeadlineSelectedListener 
 public void onArticleSelected(int position);
 

public class MainActivity extends AppCompatActivity
 implements MainFragment.OnHeadlineSelectedListener {

 @Override
 public void onAttachFragment(Fragment fragment) 
 if (fragment instanceof MainFragment) 
 MainFragment headlinesFragment = (MainFragment) fragment;
 headlinesFragment.setOnHeadlineSelectedListener(this);
 
 

 @Override
 public void onArticleSelected(int position) 

 MenuFragment newFragment = new MenuFragment();
 Bundle bundle = new Bundle();
 bundle.putInt("Integer", position);
 newFragment.setArguments(bundle);

 

android android-fragments callback

android android-fragments callback

share|improve this question

edited Mar 22 at 5:51

Vadim Bugakov

asked Mar 21 at 20:36

Vadim BugakovVadim Bugakov

65

share|improve this question

edited Mar 22 at 5:51

Vadim Bugakov

asked Mar 21 at 20:36

Vadim BugakovVadim Bugakov

65

asked Mar 21 at 20:36

Vadim BugakovVadim Bugakov

65

asked Mar 21 at 20:36

Vadim BugakovVadim Bugakov

65

2 Answers
2

active

oldest

votes

0

You are trying to cast your OnHeadlineSelectedListener callback to Activity.class type. But this are two different types! You should pass a OnHeadlineSelectedListener callback to the setOnHeadlineSelectedListener() method, like this:

public void setOnHeadlineSelectedListener(OnHeadlineSelectedListener callback) 
 this.callback = callback;

Or your MainActivity must implement HeadlinesFragment.OnHeadlineSelectedListener

public static class MainActivity extends Activity
 implements HeadlinesFragment.OnHeadlineSelectedListener

Check it in your code!

share|improve this answer

answered Mar 21 at 20:55

Alexander GapanowichAlexander Gapanowich

2016

add a comment | 

0

Whats inside your fragment instanceof MainFragment will not be executed
you fragment is HeadlinesFragment not MainFragment

public static class MainActivity extends Activity
 implements HeadlinesFragment.OnHeadlineSelectedListener
 // ...

 @Override
 public void onAttachFragment(Fragment fragment) 
 if (fragment instanceof HeadlinesFragment) 
 HeadlinesFragment headlinesFragment = (HeadlinesFragment) fragment;
 headlinesFragment.setOnHeadlineSelectedListener(this);
 
 

share|improve this answer

answered Mar 22 at 10:31

Yassine BELDIYassine BELDI

505415

add a comment | 

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0

You are trying to cast your OnHeadlineSelectedListener callback to Activity.class type. But this are two different types! You should pass a OnHeadlineSelectedListener callback to the setOnHeadlineSelectedListener() method, like this:

public void setOnHeadlineSelectedListener(OnHeadlineSelectedListener callback) 
 this.callback = callback;

Or your MainActivity must implement HeadlinesFragment.OnHeadlineSelectedListener

public static class MainActivity extends Activity
 implements HeadlinesFragment.OnHeadlineSelectedListener

Check it in your code!

share|improve this answer

answered Mar 21 at 20:55

Alexander GapanowichAlexander Gapanowich

2016

add a comment | 

0

You are trying to cast your OnHeadlineSelectedListener callback to Activity.class type. But this are two different types! You should pass a OnHeadlineSelectedListener callback to the setOnHeadlineSelectedListener() method, like this:

public void setOnHeadlineSelectedListener(OnHeadlineSelectedListener callback) 
 this.callback = callback;

Or your MainActivity must implement HeadlinesFragment.OnHeadlineSelectedListener

public static class MainActivity extends Activity
 implements HeadlinesFragment.OnHeadlineSelectedListener

Check it in your code!

share|improve this answer

answered Mar 21 at 20:55

Alexander GapanowichAlexander Gapanowich

2016

add a comment | 

You are trying to cast your OnHeadlineSelectedListener callback to Activity.class type. But this are two different types! You should pass a OnHeadlineSelectedListener callback to the setOnHeadlineSelectedListener() method, like this:

public void setOnHeadlineSelectedListener(OnHeadlineSelectedListener callback) 
 this.callback = callback;

Or your MainActivity must implement HeadlinesFragment.OnHeadlineSelectedListener

public static class MainActivity extends Activity
 implements HeadlinesFragment.OnHeadlineSelectedListener

Check it in your code!

share|improve this answer

answered Mar 21 at 20:55

Alexander GapanowichAlexander Gapanowich

2016

public void setOnHeadlineSelectedListener(OnHeadlineSelectedListener callback) 
 this.callback = callback;

public static class MainActivity extends Activity
 implements HeadlinesFragment.OnHeadlineSelectedListener

share|improve this answer

answered Mar 21 at 20:55

Alexander GapanowichAlexander Gapanowich

2016

answered Mar 21 at 20:55

Alexander GapanowichAlexander Gapanowich

2016

answered Mar 21 at 20:55

Alexander GapanowichAlexander Gapanowich

2016

0

Whats inside your fragment instanceof MainFragment will not be executed
you fragment is HeadlinesFragment not MainFragment

public static class MainActivity extends Activity
 implements HeadlinesFragment.OnHeadlineSelectedListener
 // ...

 @Override
 public void onAttachFragment(Fragment fragment) 
 if (fragment instanceof HeadlinesFragment) 
 HeadlinesFragment headlinesFragment = (HeadlinesFragment) fragment;
 headlinesFragment.setOnHeadlineSelectedListener(this);
 
 

share|improve this answer

answered Mar 22 at 10:31

Yassine BELDIYassine BELDI

505415

add a comment | 

0

Whats inside your fragment instanceof MainFragment will not be executed
you fragment is HeadlinesFragment not MainFragment

public static class MainActivity extends Activity
 implements HeadlinesFragment.OnHeadlineSelectedListener
 // ...

 @Override
 public void onAttachFragment(Fragment fragment) 
 if (fragment instanceof HeadlinesFragment) 
 HeadlinesFragment headlinesFragment = (HeadlinesFragment) fragment;
 headlinesFragment.setOnHeadlineSelectedListener(this);
 
 

share|improve this answer

answered Mar 22 at 10:31

Yassine BELDIYassine BELDI

505415

add a comment | 

Whats inside your fragment instanceof MainFragment will not be executed
you fragment is HeadlinesFragment not MainFragment

public static class MainActivity extends Activity
 implements HeadlinesFragment.OnHeadlineSelectedListener
 // ...

 @Override
 public void onAttachFragment(Fragment fragment) 
 if (fragment instanceof HeadlinesFragment) 
 HeadlinesFragment headlinesFragment = (HeadlinesFragment) fragment;
 headlinesFragment.setOnHeadlineSelectedListener(this);
 
 

share|improve this answer

answered Mar 22 at 10:31

Yassine BELDIYassine BELDI

505415

public static class MainActivity extends Activity
 implements HeadlinesFragment.OnHeadlineSelectedListener
 // ...

 @Override
 public void onAttachFragment(Fragment fragment) 
 if (fragment instanceof HeadlinesFragment) 
 HeadlinesFragment headlinesFragment = (HeadlinesFragment) fragment;
 headlinesFragment.setOnHeadlineSelectedListener(this);
 
 

share|improve this answer

answered Mar 22 at 10:31

Yassine BELDIYassine BELDI

505415

answered Mar 22 at 10:31

Yassine BELDIYassine BELDI

505415

answered Mar 22 at 10:31

Yassine BELDIYassine BELDI

505415