Changing font size into an AlertDialog

问题:

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 workaround I tried and their issues.

Workaround 1) Using a TextView and myView.setTextSize(12);

final TextView myView = new TextView(getApplicationContext());
myView.setText(myLongText);
myView.setTextSize(12);
final AlertDialog d = new AlertDialog.Builder(context)
    .setPositiveButton(android.R.string.ok, null)
.setTitle(myTitle)
.setView(myView)
.create();

Issues: Layout is not scrolling

Workaround 2) making TextView scrollable.

message.setMovementMethod(LinkMovementMethod.getInstance());

Issues: Layout is scrolling, bute there is no "inertia" (don't know how to call that.. But I guess you understand.)

Workaround 3) Using a Scrollview.

That's what I am going to try, but I cannot believe there are no easier solutions...

回答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.

回答2:

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.

回答3:

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();

回答4:

Here is my solution... you need to create the scroll container, then add the TextView inside the ScrollView just as you would in the XML layout.

AlertDialog alertDialog = new AlertDialog.Builder(this).create();
String str = getString(R.string.upgrade_notes); 
final ScrollView s_view = new ScrollView(getApplicationContext());
final TextView t_view = new TextView(getApplicationContext());
t_view.setText(str);
t_view.setTextSize(14);     
s_view.addView(t_view);
alertDialog.setTitle("Upgrade notes!");
alertDialog.setView(s_view);

回答5:

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