align AlertDialog buttons to center

Question

I use this codes for Android (Java) programming:

public static MessageBoxResult showOk(
        Context context, String title, String message, String okMessa         


        

Answer 1

Ended up with this extension for Kotlin:

fun AlertDialog.withCenteredButtons() {
    val positive = getButton(AlertDialog.BUTTON_POSITIVE)
    val negative = getButton(AlertDialog.BUTTON_NEGATIVE)

    //Disable the material spacer view in case there is one
    val parent = positive.parent as? LinearLayout
    parent?.gravity = Gravity.CENTER_HORIZONTAL
    val leftSpacer = parent?.getChildAt(1)
    leftSpacer?.visibility = View.GONE

    //Force the default buttons to center
    val layoutParams = LinearLayout.LayoutParams(
        LinearLayout.LayoutParams.MATCH_PARENT,
        LinearLayout.LayoutParams.WRAP_CONTENT
    )

    layoutParams.weight = 1f
    layoutParams.gravity = Gravity.CENTER

    positive.layoutParams = layoutParams
    negative.layoutParams = layoutParams
}

And use with:

.show().withCenteredButtons()

Answer 2

If you want to have Positive And Negative Buttons at the same time (Large & Center), you can use something like this:

AlertDialog alertDialog = new AlertDialog.Builder(this).create();
alertDialog.setTitle("Title");
alertDialog.setMessage("Message");

alertDialog.setButton(AlertDialog.BUTTON_POSITIVE, "Yes",
        new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                dialog.dismiss();
            }
        });

alertDialog.setButton(AlertDialog.BUTTON_NEGATIVE, "No",
        new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                 dialog.dismiss();
            }
         });
alertDialog.show();

Button btnPositive = alertDialog.getButton(AlertDialog.BUTTON_POSITIVE);
Button btnNegative = alertDialog.getButton(AlertDialog.BUTTON_NEGATIVE);

LinearLayout.LayoutParams layoutParams = (LinearLayout.LayoutParams) btnPositive.getLayoutParams();
layoutParams.weight = 10;
btnPositive.setLayoutParams(layoutParams);
btnNegative.setLayoutParams(layoutParams);

Answer 3

I presume you are using the AlertDialog from the Support library.

If that's the case try replacing your import to android.app.AlertDialog.

Answer 4

Tried crtn's method and Scott Brown's modification, both didn't render how I liked.

crtn's solution didn't change the appearance of the buttons for me at all (I'm using android.R.style.Theme_Material_Light_Dialog) and Scott Brown's solution made my positive button extend past the edge of the dialog parent.

For Theme_Material_Light_Dialog the buttons are contained within a LinearLayout subclass that uses a blank View as its 2nd (index 1) element to push the buttons right.

I grab the Button ref like crtn does:

AlertDialog dialog = bld.create();
dialog.show(); //show() MUST be called before dialog.getButton
Button positiveButton = dialog.getButton(AlertDialog.BUTTON_POSITIVE);

But then I set the leftSpacer to View.GONE and the parent's gravity to CENTER_HORIZONTAL

LinearLayout parent = (LinearLayout) positiveButton.getParent();
parent.setGravity(Gravity.CENTER_HORIZONTAL);
View leftSpacer = parent.getChildAt(1);
leftSpacer.setVisibility(View.GONE);

This has the advantage that it doesn't break the dialog's button stacking behavior. The disadvantage is that if the internal layout changes, it will break, so YMMV.

Answer 5

Useandroid.support.v7.app.AlertDialog which will align your positive and negative buttons in center.

android.app.AlertDialog will place the button in the top leaving 16dp space in bottom.

Answer 6

Here is something really work.

The parent of the 3 buttons (neutral, positive ve and negative) is ButtonBarLayout, which extends LinearLayout. To centralize a view in LinearLayout, weight, width and layout_gravity(but not gravity) is important, and these code works perfectly:

LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT); //create a new one
layoutParams.weight = 1.0 f;
layoutParams.gravity = Gravity.CENTER; //this is layout_gravity
alertDialog.getButton(AlertDialog.BUTTON_NEGATIVE).setLayoutParams(layoutParams);