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    <p>You can define an interface in <code>Fragment</code> B and implement it on the MainActivity. Then on the callback method (onClickOnB in this case) set the text on the <code>TextView</code>. You should obtain a reference of the <code>TextView</code> in the <code>Activity</code>'s <code>onCreate()</code> after <code>setContentView()</code>. This works because <code>Fragment</code> A is static. Otherwise, you can create a public method inside <code>Fragment</code> A so you can set the text from inside the callback by getting a reference of <code>Fragment</code> A and calling such method.</p> <p><code>Fragment</code> B</p> <pre><code>public class FragmentB extends Fragment implements onClickListener{ ClickOnB listener; public void setOnFragmentBClickListener(ClickOnB listener){ this.listener = listener; } @Override public void onClick(View v){ //stringMessage is a `String` you will pass to `Fragment` A to update its `TextView` listener.onClickOnB(stringMessage); } interface ClickOnB{ public void onClickOnB(String message); } } </code></pre> <p><code>MainActivity</code></p> <pre><code>public class MainActivity extends Activity implements ClickOnB{ @Override protected onCreate(Bundle savedInstanceState){ //Get a reference of `Fragment` B somewhere in your code after you added it dynamically and set the listener. ((FragmentB)getFragmentManager().findFragmentByTag("FragmentB")).setOnFragmentBClickListener(this); } @Override public void onClickOnB(String message){ //Set the text to the `TextView` here (I am assuming you get a reference of the `TextView` in onCreate() after inflating your layout. mTextView.setText(message); } } </code></pre>
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    1. POupdate TextView in fragment A when clicking button in fragment B
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    1. POupdate TextView in fragment A when clicking button in fragment B
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    1. COI tried implementing the interface in fragment A that I declared in fragment B, but I still got a null pointer. I have changed my code to use interfaces but communicate through the activity as sjdutta suggested, but I am still getting the null pointer. Do you see anything in my updated code that could be causing this?
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    2. COLook at my edited answer
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    3. COThank you so much Emmanuel! It was pointing me in the direction of editting the TextView from the activity that solved my problem.
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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