Views not found for Alert Dialog in fragments

Question

I am trying to populate an Alert Dialog (with a layout file having an EditText & Button) within a fragment of Activity. The components are not being found by calling findViewById() in the fragment's corresponding class. I have written this code inside the class :

    AlertDialog.Builder builder=new AlertDialog.Builder(context); 
    View v=getLayoutInflater().inflate(R.layout.layout_alert_dialog,null);
    final EditText txtAddNew=v.findViewById(R.id.txtAddNew);                //null
    final TextView txtErr = v.findViewById(R.id.txtErr);                    //null
    Button btnAdd=v.findViewById(R.id.btnAdd);                              //null

I think the problem raises from this line of code:

 View v=getLayoutInflater().inflate(R.layout.layout_alert_dialog,null);

The alertDialog XML code is below:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <EditText
        android:id="@+id/txtAddNew"
        android:hint="Category name"/>
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/txtErr"
    />
    <Button
        android:id="@+id/btnAdd"
        android:text="Add Category" />
</LinearLayout>

Can anyone find what the actual problem is? Thanks!

@https://stackoverflow.com/users/2016562/gabriele-mariotti still the same — Muzzammil Hussain, Oct 28 '19 at 08:16

score 1 · Answer 1 · answered Oct 28 '19 at 08:12

1

Yes, that's correct
Do something like this :

LayoutInflater layout = LayoutInflater.from(this);
final View view = layout.inflate(R.layout.dialog_layout, null);
final AlertDialog dialog = new AlertDialog.Builder(this).create();
dialog.setView(view);
dialog.show();

answered Oct 28 '19 at 08:12

Amjad Alwareh

2,926
22
27

this won't help. You don't need to set a view somewhere to use `findViewById()` on it. – Vladyslav Matviienko Oct 28 '19 at 08:51

Anjana · Answer 2 · 2019-10-28T12:06:09.960

1

You can do it like below.

AlertDialog.Builder alertBuilder = new AlertDialog.Builder(getActivity());    
alertBuilder.setView(getLayoutInflater().inflate(R.layout.layout_alert_dialog,null));
AlertDialog alertDialog = alertBuilder.create();
EditText txtAddNew = alertDialog.findViewById(R.id.txtAddNew);
TextView txtErr = alertDialog.findViewById(R.id.txtErr);
Button btnAdd = alertDialog.findViewById(R.id.btnAdd);
alertDialog.show();

edited Oct 28 '19 at 12:06

answered Oct 28 '19 at 08:25

Anjana

903
1
5
13

The components are still null. Actually I am populating the AlertDialog from a fragment's corresponding class. – Muzzammil Hussain Oct 28 '19 at 08:31
did you used the context and layout correctly, there were mistakes in my code posted earlier. – Anjana Oct 28 '19 at 08:35
Since you are in a fragment, try using getActivity() instead the context. – Anjana Oct 28 '19 at 08:39

Sharone Lev · Answer 3 · 2019-10-28T08:48:45.027

0

Try using dialog.setContentView(v)

See the difference between setView(v) and setContentView(v) here: What is difference between Dialog.setContentView( View ) & AlertDialog.setView( View )

edited Oct 28 '19 at 08:48

answered Oct 28 '19 at 08:22

Sharone Lev

791
7
15

Please note that builder doesn't has a method called setContentView(). it should be AlertDialog. – Anjana Oct 28 '19 at 08:32
The exception changed from NullPointer to this: – Muzzammil Hussain Oct 28 '19 at 08:46
requestFeature() must be called before adding content at com.android.internal.policy.PhoneWindow.requestFeature(PhoneWindow.java:398) at com.android.internal.app.AlertController.installContent(AlertController.java:251) at android.app.AlertDialog.onCreate(AlertDialog.java:437) – Muzzammil Hussain Oct 28 '19 at 08:46
this won't help. You don't need to set a view somewhere to use `findViewById()` on it. – Vladyslav Matviienko Oct 28 '19 at 08:51
I am trying to put validation on the EditText in the alert dialog and thus I need to access the EditText by findViewById() – Muzzammil Hussain Oct 28 '19 at 08:58

Views not found for Alert Dialog in fragments

3 Answers3