CODEWITHSUNDEEP
javaandroidnullpointerexceptionandroid-alertdialog
Confuse
Confuse

Reputation: 5786

Access buttons in custom alert dialog

I have created a custom alert dialog using the following code -

AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
LayoutInflater inflater = this.getLayoutInflater();

builder.setView(inflater.inflate(R.layout.dialog, null))
       .setTitle("test")
       .setCancelable(true);

AlertDialog alert11 = builder.create();
alert11.show();

Here is the code of the layout dialog.xml which is used in the alert dialog -

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical">

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Cancel" />

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Set"/>

</LinearLayout>

Now, how to get a reference of the button to set a click listener?

I tried this -

Button mButton = (Button) findViewById(R.id.button1);

but I get an exception -

java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setText(java.lang.CharSequence)' on a null object reference

Is there any other way to access the button?

Upvotes: 1

Views: 1425

Answers (6)

Mohit Rajput
Mohit Rajput

Reputation: 449

Use this code which will solve your problem-

View view = (LinearLayout) getLayoutInflater()
                .inflate(R.layout.dialog, null);
AlertDialog.Builder builder = new AlertDialog.Builder(context);
builder.setView(view);
final AlertDialog mDialog = builder.create();
mDialog.setCancelable(false);

Button mButton = (Button) view.findViewById(R.id.button1);
mDialog.show();

Upvotes: 1

Kunu
Kunu

Reputation: 5134

in your case use

Button mButton = (Button)(inflater.inflate(R.layout.dialog, null)). findViewById(R.id.button1);

Upvotes: 1

Giru Bhai
Giru Bhai

Reputation: 14398

First inflate your custom view as

View dialoglayout = inflater.inflate(R.layout.dialog, null);

then use dialoglayout as 

  builder.setView(dialoglayout)
   .setTitle("test")
   .setCancelable(true);

and now find button as

Button mButton = (Button) dialoglayout.findViewById(R.id.button1);

Upvotes: 1

Ankit Kumar
Ankit Kumar

Reputation: 3723

U can customize full alert dialog as per requirement.. check this answer.. Android - change dialog button location

Upvotes: 1

Blackbelt
Blackbelt

Reputation: 157437

you are looking for the button in the wrong place.

View view = inflater.inflate(R.layout.dialog, null);
builder.setView(view)
       .setTitle("test")
       .setCancelable(true);

and then use view to look for your buotton

Upvotes: 1

Rajan Bhavsar
Rajan Bhavsar

Reputation: 1857

You can access a Button Like this way 

Button dialogButton = (Button) alert11.findViewById(R.id.button1);

Upvotes: 1

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