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POSetting a String Tag for a fragment
 

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  1. POSetting a String Tag for a fragment
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    <p>What is wrong with this code snippet .... my app crashes here</p> <pre><code>frag.settext("Default Messaage"); // dEBUGGER SAYS THE PROBLEM IS HERE IT THROWS NPE </code></pre> <p>Code Snippet</p> <pre><code>public void question_displayer(View v){ Log.i("create","question_displayer()"); RamadanData data_object = new RamadanData(); fragment_question_displayer at = new fragment_question_displayer(); FragmentTransaction fragment_question = getSupportFragmentManager().beginTransaction().add(at, "why"); fragment_question.replace(R.id.framelayout1, new fragment_question_displayer() ,null); fragment_question.addToBackStack(null); fragment_question.commit(); fragment_question_displayer frag = (fragment_question_displayer)getSupportFragmentManager().findFragmentByTag("why"); frag.settext("Default Messaage"); // dEBUGGER SAYS THE PROBLEM IS HERE IT THROWS NPE </code></pre> <p><strong>fragment_question_displayer CLASS</strong> </p> <pre><code>package com.alisaeed.fragments; import android.content.Context; import android.os.Bundle; import android.support.v4.app.Fragment; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.webkit.WebView.FindListener; import android.widget.TextView; import com.alisaeed.newramadan.R; public class fragment_question_displayer extends Fragment { Context context; TextView question_displayer; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { context = inflater.getContext(); View v= inflater.inflate(R.layout.question_displayer, container, false); // TextView question_displayer = (TextView)v.findViewById(R.id.textView_question ); // question_displayer.setText("Default Message"); return v; } public void settext(String question){ question_displayer = (TextView)getView().findViewById(R.id.textView_question); question_displayer.setText(question); } } </code></pre> <p><strong>question_displayer XML</strong></p> <pre><code>&lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" 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" tools:context=".Question_displayer" android:tag="Hello" &gt; &lt;Button android:id="@+id/button4" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/button3" android:layout_alignParentBottom="true" android:layout_marginBottom="36dp" android:text="D" /&gt; &lt;Button android:id="@+id/button3" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_above="@+id/button4" android:layout_alignLeft="@+id/button2" android:layout_marginBottom="15dp" android:text="C" /&gt; &lt;Button android:id="@+id/button2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_above="@+id/button3" android:layout_alignParentLeft="true" android:layout_marginBottom="25dp" android:text="B" /&gt; &lt;Button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_above="@+id/button2" android:layout_alignLeft="@+id/button2" android:layout_marginBottom="16dp" android:text="A" /&gt; &lt;TextView android:id="@+id/textView_question" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentTop="true" android:layout_centerHorizontal="true" android:layout_marginTop="14dp" android:text="Large Text" android:textAppearance="?android:attr/textAppearanceLarge" /&gt; &lt;/RelativeLayout&gt; </code></pre> <p>Any help will be highly appreciated ... ........... Iam beginner at this android programming </p> <p><strong>SCOTT</strong></p> <pre><code>public void question_displayer(View v){ Log.i("create","question_displayer()"); RamadanData data_object = new RamadanData(); fragment_question_displayer at = new fragment_question_displayer(); FragmentTransaction fragment_question = getSupportFragmentManager().beginTransaction().add(android.R.id.content,at, "why"); fragment_question.replace(R.id.framelayout1, new fragment_question_displayer() ,null); fragment_question.addToBackStack(null); fragment_question.commit(); getSupportFragmentManager().executePendingTransactions(); fragment_question_displayer frag = (fragment_question_displayer)getSupportFragmentManager().findFragmentByTag("why"); if(v.getId()==R.id.buttonnext) { String q = data_object.question_output(flag_autoquestion,"child","prayer" ); frag.settext(q); } switch(v.getId()){ case (R.id.buttonPrayer): { Log.i("create","prayer()"); if(child_selected == true &amp;&amp; adult_selected==false &amp;&amp; teen_selected==false ) { Log.i("create","child_selected"); String question= data_object.question_output(flag_autoquestion, "child","prayer"); Log.i("create",question); frag.settext(question); flag_autoquestion++; } break;} } } </code></pre>
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    1. USTaimoor Ali
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    1. CODon't guess where the problem is, look at the stack trace from the crash. Also, your naming conventions are very, very non-java. Class names should be Pascal Case (`FragmentQuestionDisplayer`); methods should be Camel Case (`questionDisplayer()`).
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    2. COsorry abt that will keep that in mind .... I ve written a similar code but with findFragmentbyId(int) method and it works fine but i want to know what is wrong with this .. Can u tell me the concept regarding the first argument of the add function above i Knw its Fragment fragment but what is it
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    3. COSEE THE EDIT CODE
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      1. USTaimoor Ali
 

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