Alertdialog.Getbutton() Method Gives Null Pointer Exception Android

alertDialog.getButton() method gives null pointer exception android

Take a look here for the answer : http://code.google.com/p/android/issues/detail?id=6360

As it says in comment #4 you must call show() on your dialog before you can access the buttons, they are not available beforehand. For an automatic solution on how to modify the buttons as soon as they are ready see Mickeys answer

Android dialog.getButton(AlertDialog.BUTTON_POSITIVE) Null Pointer

The Views in a Dialog aren't created until the Dialog is actually shown; that is, until you call dialog.show(). The create() method name is a little misleading. If you try to get a reference to the Positive button before then, it will return null. Move the Button positiveButton... code block to after your call to dialog.show().

AlertDialog getButton() method returns null

I am pretty sure the view is not inflated until later in the life-cycle (i.e. on calling show()).

I took a quick look at the docs and couldn't find a build() or inflate() method but I would expect that the easiest way is just to move the noteAlert.show() before the button manipulation logic

EDIT:
Did you try changing:

noteAlert.setPositiveButton("Positive", new DialogInterface.OnClickListener() {
    public void onClick(DialogInterface dialog, int whichButton) {
        // some code
    }
});

to

noteAlert.setButton(DialogInterface.BUTTON_POSITIVE, "Positive", new DialogInterface.OnClickListener() {
    public void onClick(DialogInterface dialog, int whichButton) {
        // some code
    }
});

dialog.getButton() is not reachable in Android Kotlin

You should add setTextColor after show();

    val alertDialog = AlertDialog.Builder(this).create()
    alertDialog.setTitle(getString((R.string.app_name)))
    alertDialog.setMessage(getString(R.string.app_name))
    alertDialog.setButton(AlertDialog.BUTTON_POSITIVE, "RESUME"
    ) { dialog, which -> dialog.dismiss() }

    alertDialog.setButton(AlertDialog.BUTTON_NEGATIVE, "ABORT"
    ) { dialog, which -> dialog.dismiss() }

    alertDialog.show()
    alertDialog.setCancelable(false)
    alertDialog.getButton(AlertDialog.BUTTON_POSITIVE).setTextColor(ContextCompat.getColor(this,R.color.colorPrimary))
    alertDialog.getButton(AlertDialog.BUTTON_NEGATIVE).setTextColor(ContextCompat.getColor(this,R.color.colorAccent))

can't get a pointer on my button in a dialogfragment

The positive Button won't actually be created until the Dialog is shown. Since you're in a DialogFragment, you're not handling the show() call on the Dialog directly. You could set an OnShowListener on the AlertDialog, but it's probably simpler to just get the Button in the DialogFragment's onStart() method.

@Override
public void onStart() {
    super.onStart();

    positiveButton = ((AlertDialog) getDialog()).getButton(AlertDialog.BUTTON_POSITIVE);
    ...
}

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