Changing font size into an AlertDialog

Question

I am trying to put some loooong text into an AlertDialog. The only issue the default font size that is really too big, so I want to make it smaller.

Here are all the

Answer 1

You can actually get access to the message's TextView pretty easily, and then change it's size. I tested with a bigger size, but you could use whatever size you want. The text will scroll nicely as it already does. The view's id is android.R.id.message

    AlertDialog dialog = new AlertDialog.Builder(this).setMessage("Hello world").show();
    TextView textView = (TextView) dialog.findViewById(android.R.id.message);
    textView.setTextSize(40);

This is probably a cleaner solution, though I'm not sure if there's a risk that the TextView could be null or not.

Answer 2

You can solve this issue by using SpannableStringBuilder instead of a string.

http://www.android--tutorials.com/2016/10/android-change-alertdialog-title-text_21.html

Answer 3

This works in 2020. I have tested this in Android 10

AlertDialog.Builder builder = new AlertDialog.Builder(this, R.style.YourStyle) //Style is only needed if you want to customize look&feel
            .setTitle(R.string.title)
            .setMessage(R.string.message)
            .setPositiveButton(R.string.accept, null);
    AlertDialog alertDialog = builder.create();
    alertDialog.setOnShowListener(dialog -> {
        //The following is to style dialog message
        TextView message = alertDialog.findViewById(android.R.id.message);
        if (message != null) {
            message.setTextSize(12);
            message.setTextColor(getColor(R.color.yellow));
        }
        //The following is to style dialog title. Note that id is alertTitle
        TextView title = alertDialog.findViewById(R.id.alertTitle);
        if (title != null) {
            title.setTextColor(getColor(R.color.black));
        }
    });
    alertDialog.show();

Answer 4

I am using the following code to change the title and message text for AlertDialog…

final int alertTitle = ctx.getResources().getIdentifier("alertTitle", "id", "android");
setTitleFont((TextView) dlg.findViewById(alertTitle));
setBodyFont((TextView) dlg.findViewById(android.R.id.message));

… making sure that I check for null in my setTitleFont and setBodyFont methods.

Answer 5

               AlertDialog.Builder builder = new 
                AlertDialog.Builder(YourActivity.this);
                builder.setTitle("Your Title");
                builder.setMessage("Your Message");
                builder.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialogInterface, int i) {
                        // Your Positive Function
                    }
                });
                builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialogInterface, int i) {
                        // Your Negative Function
                    }
                });
                builder.show();

Answer 6

For Buttons:

  final AlertDialog ad = new AlertDialog.Builder(mainScreen)
.setPositiveButton("OK", null) 
.setNegativeButton("Cancel", null).create();

ad.setOnShowListener(new DialogInterface.OnShowListener() {
                                            @Override
                                            public void onShow(DialogInterface dialog) {
                                                int textSize = (int) Helper.getDimen(mainScreen, R.dimen.textSize12);
                                                ad.getButton(Dialog.BUTTON_POSITIVE).setTextSize(textSize);
                                                ad.getButton(Dialog.BUTTON_NEGATIVE).setTextSize(textSize);
                                            }


                                      });

ad.show();