Change font size for an AlertDialog message

Question

I'm trying to change the font size of the AlertDialog message.

Button submit = (Button) findViewById(R.id.submitButton);
submit.setOnClickListener(new View.OnClickListener() {

    public void onClick(View view) {
        AlertDialog.Builder builder = new AlertDialog.Builder(
                Application1GoodExample.this);
        builder.setMessage("Your form has been successfully submitted");
        TextView textView = (TextView) findViewById(android.R.id.message);
        textView.setTextSize(40);
        builder.setNegativeButton("Exit", new DialogInterface.OnClickListener() {

            public void onClick(DialogInterface dialog, int which) {
                dialog.cancel();             
            }
        });

        builder.show();
    }
});

I get an error message saying that "findViewById()" is undefined for the type AlertDialog.Builder.

score 29 · Accepted Answer · edited Aug 28 '14 at 10:16

29

Use this :

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

TextView msgTxt = (TextView) alert.findViewById(android.R.id.message);   
msgTxt.setTextSize(16.0);

in your case :

Button submit = (Button) findViewById(R.id.submitButton);

submit.setOnClickListener(new View.OnClickListener() {
    public void onClick(View view) {
        AlertDialog.Builder builder = new AlertDialog.Builder(Application1GoodExample.this);

        builder.setMessage("Your form has been successfully submitted");
        builder.setNegativeButton("Exit", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                dialog.cancel();             
            }
        });

        // this will solve your error
        AlertDialog alert = builder.create();
        alert.show();
        alert.getWindow().getAttributes();

        TextView textView = (TextView) alert.findViewById(android.R.id.message);
        textView.setTextSize(40);
        Button btn1 = alert.getButton(DialogInterface.BUTTON_NEGATIVE);
        btn1.setTextSize(16);
    }
});

If this didn't help you, post your LogCat Error in your question.

edited Aug 28 '14 at 10:16

Melquiades

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answered Mar 12 '13 at 13:16

AwadKab

3,054
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17

For some reason my progam crashes when I press the submit button to display an alert dialog message – Alex Mar 12 '13 at 13:25
1

I edited my answer. Error because you use `builder.show();`. – AwadKab Mar 12 '13 at 14:54
This worked perfectly! thank you so much! I am also trying to change the size of the "Exit" button but as I'm very new to Android I cannot figure out how to do it properly. – Alex Mar 12 '13 at 15:31
1

I edited my answer to achive what you want. – AwadKab Mar 12 '13 at 16:27
How to do the same thing to the title? – MMachado Dec 23 '20 at 11:59

score 4 · Answer 2 · answered Mar 12 '13 at 13:54

4

Try this

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

answered Mar 12 '13 at 13:54

R KiranKumar

825
1
8
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score 1 · Answer 3 · answered Mar 12 '13 at 13:11

1

the method findViewById belongs to the type View.

AlertDialog.Builder builder = new AlertDialog.Builder(Application1GoodExample.this);
builder.setNegativeButton("Exit", new DialogInterface.OnClickListener() {
    public void onClick(DialogInterface dialog, int which) {
    dialog.cancel();           
    } 
});
builder.setMessage("Your form has been successfully submitted");
AlertDialog theDialog=builder.create();
TextView textView = (TextView) theDialog.findViewById(android.R.id.message);
textView.setTextSize(40);

theDialog.show();

answered Mar 12 '13 at 13:11

Sebastian Breit

6,137
1
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For some reason my progam crashes when I press the submit button to display an alert dialog message – Alex Mar 12 '13 at 13:21
maybe if you show us the logcat output :) – Sebastian Breit Mar 12 '13 at 15:52
I have used AwadKab's solution and managed to change the size of the Alert message without getting any errors. Do you know if I can do the same for the "Exit" button? I'm very new to Android development and cannot figure out how to do this. thank you. – Alex Mar 12 '13 at 16:00
1

if you want to customize the elements of a dialog, the best way is to create a brand new view for your dialog. Take a look at this: http://www.mkyong.com/android/android-custom-dialog-example/ – Sebastian Breit Mar 12 '13 at 16:12

score 0 · Answer 4 · answered Mar 12 '13 at 13:09

0

Since you are not using CustomDialog, i suggest you to add TextView as following,

TextView textView = (TextView) findViewById(android.R.id.message); // remove builder object

answered Mar 12 '13 at 13:09

Raynold

443
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9
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This worked, thank you. However, my program crashes when I press the Submit button. I've updated my code above. – Alex Mar 12 '13 at 13:16

Change font size for an AlertDialog message

4 Answers4