[android-developers] Re: Honeycomb / Fragments: can't remove a fragment added in XML layout

[12169]

if use want to remove the fragments then the best way to add it dynamically.
just create the fragment view in a seperate .xml file and add it to your 
manager using fragmentmanager that is associated with your activity.

On Wednesday, March 9, 2011 3:34:31 PM UTC+5:30, clemp6r wrote:
>
> Hi, 
>
> I can't remove a Fragment that was added in an XML layout file, using 
> a FragmentTransaction. I don't understand why, I probably 
> misunderstood something and I would appreciate some explanations. 
>
>  
> Here's a simple code to demonstrate my problem : 
>
> ** Main layout, main.xml: 
> http://schemas.android.com/apk/res/ 
> android" 
> android:orientation="vertical" 
> android:layout_width="fill_parent" android:layout_height="fill_parent" 
> android:id="@+id/root" 
> > 
>  android:layout_width="fill_parent" 
> android:layout_height="wrap_content" 
> android:text="@string/hello" 
> /> 
>
>  android:id="@+id/fragment_a" 
> android:layout_width="fill_parent" 
> android:layout_height="wrap_content" 
> /> 
>  
>
> ** Main activity: 
> public class TestFragmentsActivity extends Activity { 
>
> @Override 
> public void onCreate(Bundle savedInstanceState) { 
> super.onCreate(savedInstanceState); 
> setContentView(R.layout.main); 
>
> TextView helloView = (TextView) 
> findViewById(R.id.hello_view); 
> helloView.setOnClickListener(new OnClickListener() { 
>
> @Override 
> public void onClick(View v) { 
> FragmentManager fragmentManager = 
> getFragmentManager(); 
> FragmentTransaction transaction = 
> fragmentManager.beginTransaction(); 
>   
> transaction.remove(fragmentManager.findFragmentById(R.id.fragment_a)); 
> transaction.commit(); 
> } 
> }); 
> } 
> } 
>
> ** My fragment class: 
> public class FragmentA extends Fragment { 
>
> @Override 
> public View onCreateView(LayoutInflater inflater, ViewGroup 
> container, Bundle savedInstanceState) { 
> return inflater.inflate(R.layout.layout_a, container, 
> false); 
> } 
> } 
>
> ** Fragment layout, layout_a.xml: 
> http://schemas.android.com/apk/res/ 
> android" android:layout_width="match_parent" 
> android:layout_height="match_parent"> 
>  android:layout_height="wrap_content"> 
>  
>  
>
> When I click on the text view, the fragment should be removed, but 
> nothing seems to happen. If I click again, the application crashes 
> with the following error messages: 
>
> 03-09 09:48:09.248: ERROR/AndroidRuntime(1222): 
> java.lang.NullPointerException 
> 03-09 09:48:09.248: ERROR/AndroidRuntime(1222): at 
> android.app.BackStackRecord.remove(BackStackRecord.java:365) 
> 03-09 09:48:09.248: ERROR/AndroidRuntime(1222): at 
> test.fragments.TestFragmentsActivity 
> $1.onClick(TestFragmentsActivity.java:28) 
>
>
> Maybe it's not possible to remove fragments that were added using XML 
> layouts? 
>
> Thanks in advance.

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Re: [android-developers] Re: Honeycomb / Fragments: can't remove a fragment added in XML layout

[Clément Plantier]

No, I wasn't waiting for the answer ^^

As far as I remember I was trying to remove a fragment from the hierarchy,
so just hiding it is not a solution. But this is not my problem anymore.


2013/9/24 Piren 

> I hope he was not still waiting for that answer.
>
>
> On Tuesday, September 24, 2013 3:39:14 PM UTC+3, Adarsh Pandey wrote:
>>
>> use
>>
>> findViewById(R.id.fragment).**setVisibility(View.GONE);
>>
>> On Wednesday, March 9, 2011 3:34:31 PM UTC+5:30, clemp6r wrote:
>>>
>>> Hi,
>>>
>>> I can't remove a Fragment that was added in an XML layout file, using
>>> a FragmentTransaction. I don't understand why, I probably
>>> misunderstood something and I would appreciate some explanations.
>>>
>>> 
>>> Here's a simple code to demonstrate my problem :
>>>
>>> ** Main layout, main.xml:
>>> >> xmlns:android="http://schemas.**android.com/apk/res/
>>> android"
>>> android:orientation="vertical"
>>> android:layout_width="fill_**parent" android:layout_height="fill_**parent"
>>>
>>> android:id="@+id/root"
>>> >
>>> >> android:layout_width="fill_**parent"
>>> android:layout_height="wrap_**content"
>>> android:text="@string/hello"
>>> />
>>>
>>> >> android:id="@+id/fragment_a"
>>> android:layout_width="fill_**parent"
>>> android:layout_height="wrap_**content"
>>> />
>>> 
>>>
>>> ** Main activity:
>>> public class TestFragmentsActivity extends Activity {
>>>
>>> @Override
>>> public void onCreate(Bundle savedInstanceState) {
>>> super.onCreate(**savedInstanceState);
>>> setContentView(R.layout.main);
>>>
>>> TextView helloView = (TextView)
>>> findViewById(R.id.hello_view);
>>> helloView.setOnClickListener(**new OnClickListener() {
>>>
>>> @Override
>>> public void onClick(View v) {
>>> FragmentManager fragmentManager =
>>> getFragmentManager();
>>> FragmentTransaction transaction =
>>> fragmentManager.**beginTransaction();
>>>
>>> transaction.remove(**fragmentManager.**findFragmentById(R.id.**fragment_a));
>>>
>>> transaction.commit();
>>> }
>>> });
>>> }
>>> }
>>>
>>> ** My fragment class:
>>> public class FragmentA extends Fragment {
>>>
>>> @Override
>>> public View onCreateView(LayoutInflater inflater, ViewGroup
>>> container, Bundle savedInstanceState) {
>>> return inflater.inflate(R.layout.**layout_a, container,
>>> false);
>>> }
>>> }
>>>
>>> ** Fragment layout, layout_a.xml:
>>> >> xmlns:android="http://schemas.**android.com/apk/res/
>>> android" android:layout_width="match_**parent"
>>> android:layout_height="match_**parent">
>>> >> android:layout_height="wrap_**content">
>>> 
>>> 
>>>
>>> When I click on the text view, the fragment should be removed, but
>>> nothing seems to happen. If I click again, the application crashes
>>> with the following error messages:
>>>
>>> 03-09 09:48:09.248: ERROR/AndroidRuntime(1222):
>>> java.lang.NullPointerException
>>> 03-09 09:48:09.248: ERROR/AndroidRuntime(1222): at
>>> android.app.BackStackRecord.**remove(BackStackRecord.java:**365)
>>> 03-09 09:48:09.248: ERROR/AndroidRuntime(1222): at
>>> test.fragments.**TestFragmentsActivity
>>> $1.onClick(**TestFragmentsActivity.java:28)
>>>
>>>
>>> Maybe it's not possible to remove fragments that were added using XML
>>> layouts?
>>>
>>> Thanks in advance.
>>
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[android-developers] Re: Honeycomb / Fragments: can't remove a fragment added in XML layout

[Piren]

I hope he was not still waiting for that answer.

On Tuesday, September 24, 2013 3:39:14 PM UTC+3, Adarsh Pandey wrote:
>
> use 
>
> findViewById(R.id.fragment).setVisibility(View.GONE);
>
> On Wednesday, March 9, 2011 3:34:31 PM UTC+5:30, clemp6r wrote:
>>
>> Hi, 
>>
>> I can't remove a Fragment that was added in an XML layout file, using 
>> a FragmentTransaction. I don't understand why, I probably 
>> misunderstood something and I would appreciate some explanations. 
>>
>>  
>> Here's a simple code to demonstrate my problem : 
>>
>> ** Main layout, main.xml: 
>> http://schemas.android.com/apk/res/ 
>> android" 
>> android:orientation="vertical" 
>> android:layout_width="fill_parent" android:layout_height="fill_parent" 
>> android:id="@+id/root" 
>> > 
>> > android:layout_width="fill_parent" 
>> android:layout_height="wrap_content" 
>> android:text="@string/hello" 
>> /> 
>>
>> > android:id="@+id/fragment_a" 
>> android:layout_width="fill_parent" 
>> android:layout_height="wrap_content" 
>> /> 
>>  
>>
>> ** Main activity: 
>> public class TestFragmentsActivity extends Activity { 
>>
>> @Override 
>> public void onCreate(Bundle savedInstanceState) { 
>> super.onCreate(savedInstanceState); 
>> setContentView(R.layout.main); 
>>
>> TextView helloView = (TextView) 
>> findViewById(R.id.hello_view); 
>> helloView.setOnClickListener(new OnClickListener() { 
>>
>> @Override 
>> public void onClick(View v) { 
>> FragmentManager fragmentManager = 
>> getFragmentManager(); 
>> FragmentTransaction transaction = 
>> fragmentManager.beginTransaction(); 
>>   
>> transaction.remove(fragmentManager.findFragmentById(R.id.fragment_a)); 
>> transaction.commit(); 
>> } 
>> }); 
>> } 
>> } 
>>
>> ** My fragment class: 
>> public class FragmentA extends Fragment { 
>>
>> @Override 
>> public View onCreateView(LayoutInflater inflater, ViewGroup 
>> container, Bundle savedInstanceState) { 
>> return inflater.inflate(R.layout.layout_a, container, 
>> false); 
>> } 
>> } 
>>
>> ** Fragment layout, layout_a.xml: 
>> http://schemas.android.com/apk/res/ 
>> android" android:layout_width="match_parent" 
>> android:layout_height="match_parent"> 
>> > android:layout_height="wrap_content"> 
>>  
>>  
>>
>> When I click on the text view, the fragment should be removed, but 
>> nothing seems to happen. If I click again, the application crashes 
>> with the following error messages: 
>>
>> 03-09 09:48:09.248: ERROR/AndroidRuntime(1222): 
>> java.lang.NullPointerException 
>> 03-09 09:48:09.248: ERROR/AndroidRuntime(1222): at 
>> android.app.BackStackRecord.remove(BackStackRecord.java:365) 
>> 03-09 09:48:09.248: ERROR/AndroidRuntime(1222): at 
>> test.fragments.TestFragmentsActivity 
>> $1.onClick(TestFragmentsActivity.java:28) 
>>
>>
>> Maybe it's not possible to remove fragments that were added using XML 
>> layouts? 
>>
>> Thanks in advance.
>
>

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[android-developers] Re: Honeycomb / Fragments: can't remove a fragment added in XML layout

[Adarsh Pandey]

use 

findViewById(R.id.fragment).setVisibility(View.GONE);

On Wednesday, March 9, 2011 3:34:31 PM UTC+5:30, clemp6r wrote:
>
> Hi, 
>
> I can't remove a Fragment that was added in an XML layout file, using 
> a FragmentTransaction. I don't understand why, I probably 
> misunderstood something and I would appreciate some explanations. 
>
>  
> Here's a simple code to demonstrate my problem : 
>
> ** Main layout, main.xml: 
> http://schemas.android.com/apk/res/ 
> android" 
> android:orientation="vertical" 
> android:layout_width="fill_parent" android:layout_height="fill_parent" 
> android:id="@+id/root" 
> > 
>  android:layout_width="fill_parent" 
> android:layout_height="wrap_content" 
> android:text="@string/hello" 
> /> 
>
>  android:id="@+id/fragment_a" 
> android:layout_width="fill_parent" 
> android:layout_height="wrap_content" 
> /> 
>  
>
> ** Main activity: 
> public class TestFragmentsActivity extends Activity { 
>
> @Override 
> public void onCreate(Bundle savedInstanceState) { 
> super.onCreate(savedInstanceState); 
> setContentView(R.layout.main); 
>
> TextView helloView = (TextView) 
> findViewById(R.id.hello_view); 
> helloView.setOnClickListener(new OnClickListener() { 
>
> @Override 
> public void onClick(View v) { 
> FragmentManager fragmentManager = 
> getFragmentManager(); 
> FragmentTransaction transaction = 
> fragmentManager.beginTransaction(); 
>   
> transaction.remove(fragmentManager.findFragmentById(R.id.fragment_a)); 
> transaction.commit(); 
> } 
> }); 
> } 
> } 
>
> ** My fragment class: 
> public class FragmentA extends Fragment { 
>
> @Override 
> public View onCreateView(LayoutInflater inflater, ViewGroup 
> container, Bundle savedInstanceState) { 
> return inflater.inflate(R.layout.layout_a, container, 
> false); 
> } 
> } 
>
> ** Fragment layout, layout_a.xml: 
> http://schemas.android.com/apk/res/ 
> android" android:layout_width="match_parent" 
> android:layout_height="match_parent"> 
>  android:layout_height="wrap_content"> 
>  
>  
>
> When I click on the text view, the fragment should be removed, but 
> nothing seems to happen. If I click again, the application crashes 
> with the following error messages: 
>
> 03-09 09:48:09.248: ERROR/AndroidRuntime(1222): 
> java.lang.NullPointerException 
> 03-09 09:48:09.248: ERROR/AndroidRuntime(1222): at 
> android.app.BackStackRecord.remove(BackStackRecord.java:365) 
> 03-09 09:48:09.248: ERROR/AndroidRuntime(1222): at 
> test.fragments.TestFragmentsActivity 
> $1.onClick(TestFragmentsActivity.java:28) 
>
>
> Maybe it's not possible to remove fragments that were added using XML 
> layouts? 
>
> Thanks in advance.

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[android-developers] Re: Honeycomb / Fragments: can't remove a fragment added in XML layout

[drasticp]

I reproduced your issue. It seems the same for me.
FragmentTransaction.hide(Fragment) seems to work, but remove does not.
Also, the second attempt generates an exception as you described.

1up.

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