Question

在我的Android应用程序中，单击按钮后会出现一个警告对话框。我想为警报设置自定义字体。我在网上搜索了一些关于这个主题的教程和问题，但它们都不适合我。

如何更改字体？

由于

Answer 1

要执行此操作，请使用警报构建器来构建警报。然后，您可以从此警报中获取TextView，然后设置警报的字体。

AlertDialog dialog = new AlertDialog.Builder(this).setMessage("Hello world").show();
TextView textView = (TextView) dialog.findViewById(android.R.id.message);
Typeface face=Typeface.createFromAsset(getAssets(),"fonts/FONT"); 
textView.setTypeface(face);

Answer 2

上述答案对我没有用。

我使用了以下方法

//You can use this code : 
<?php
if (!isset($_GET['email'])) {
    echo '<form action="">
    Enter Your Email Id:
    <input type="text" name="email" />
    <input type="submit" value="Reset My Password" />
    </form>';
    exit();
}


define('DB_USER', '');
define('DB_PASS', '');
define('DB_NAME', '');

$email = $_GET['email'];

function connect()
{
    $link = mysql_connect('localhost', DB_USER, DB_PASS);

    if (!$link) {
        die('Could not connect: ' . mysql_error());
    }

    $db_selected = mysql_select_db(DB_NAME, $link);

    if (!$db_selected) {
        die('Can\'t use ' . DB_NAME . ': ' . mysql_error());
    }
}
connect();
$q = "SELECT email FROM users WHERE LCASE(TRIM(email))='" . strtolower(trim($email)) . "'";
$r = mysql_query($q);
$n = mysql_num_rows($r);

if ($n == 0) {
    echo "Email id is not registered";
    die();

}

在7.1.1上测试

注意：确保在显示// Initializing the alertDialog AlertDialog alertDialog = new AlertDialog.Builder(QuizActivity.this).create(); alertDialog.setTitle("Warning"); alertDialog.setMessage("Are you sure you want to exit?"); alertDialog.show(); // This should be called before looking up for elements // Getting the view elements TextView textView = (TextView) alertDialog.getWindow().findViewById(android.R.id.message); TextView alertTitle = (TextView) alertDialog.getWindow().findViewById(R.id.alertTitle); Button button1 = (Button) alertDialog.getWindow().findViewById(android.R.id.button1); Button button2 = (Button) alertDialog.getWindow().findViewById(android.R.id.button2); // Setting font textView.setTypeface(FontHelper.getFont(Fonts.MULI_REGULAR)); alertTitle.setTypeface(FontHelper.getFont(Fonts.MULI_REGULAR)); button1.setTypeface(FontHelper.getFont(Fonts.MULI_BOLD)); button2.setTypeface(FontHelper.getFont(Fonts.MULI_BOLD));后获取元素。如果没有这个，你将获得dialog

Answer 3

我知道这是一个老问题，但我将此留给那些仍在寻找解决方案的人。

如果您只想更改文字格式，只需覆盖alertDialogTheme属性即可更改AlertDialog的主题。

示例，使用应用主题：

<style name="MyTheme" parent="Theme.AppCompat.Light.NoActionBar">
    <item name="colorPrimary">@color/colorPrimary</item>
    <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
    <item name="colorAccent">@color/colorAccent</item>

    <!-- This will override the Alert Dialog theme -->
    <item name="alertDialogTheme">@style/MyAlertDialogTheme</item>
</style>

<style name="MyAlertDialogTheme" parent="@android:style/Theme.Material.Light.Dialog.Alert">
    <item name="android:textAppearanceSmall">@style/MyTextAppearanceSmall</item>
    <item name="android:textAppearanceMedium">@style/MyTextAppearanceMedium</item>
    <item name="android:textAppearanceLarge">@style/MyTextAppearanceLarge</item>
</style>

<style name="MyTextAppearance" parent="TextAppearance.AppCompat">
    <item name="android:fontFamily">@font/comic_sans</item>
</style>
(...)

如果我没有弄错，android:textAppearanceSmall用于邮件，android:textAppearanceMedium用于标题。但是你可以选择你想要的任何东西并删除其余部分。

另一个选项

不覆盖alertDialogTheme，是通过构建器构造函数设置样式。示例：AlertDialog.Builder(getActivity(), R.style.MyAlertDialogTheme)

Answer 4

您可以定义自己要显示的对话框的布局。

这是

的链接

Creating a custom dialog in Android

在布局中，您可以使用所需的typeFace定义TextView。您需要下载所需字体的otf文件。将它们放在资产目录中。并将其设置为TextView的TypeFace。以及如何设置TypeFace

这可能会有所帮助

How to change the font on the TextView?

Answer 5

如果您使用的是Material Components，则可以通过清除样式来自定义对话框，以满足几乎所有需求。例如，我为对话框创建的自定义样式：

    <style name="ThemeOverlay.App.MaterialAlertDialog" parent="ThemeOverlay.MaterialComponents.MaterialAlertDialog">
        <item name="materialAlertDialogTitleTextStyle"><!--here goes your title text style --></item>
        <item name="materialAlertDialogBodyTextStyle"><!--here goes your message text style --></item>
        <item name="colorPrimary"><!--here goes your dialog primary color. e.g. button text color, etc.--></item>
        <item name="shapeAppearanceOverlay">@style/ShapeAppearance.App.SmallComponent</item> <!-- your custom shape appearance for your dialog. In my case, I am changing corner radius of dialog to rounded 20dp corners-->
        <item name="colorSurface">@color/white</item>
        <item name="buttonBarPositiveButtonStyle">@style/Widget.App.Button</item> <!-- your custom positive button style-->
        <item name="buttonBarNegativeButtonStyle">@style/Widget.App.Button</item> <!-- your custom negtive button style-->
    </style>

    <style name="ShapeAppearance.App.SmallComponent" parent="ShapeAppearance.MaterialComponents.SmallComponent">
        <item name="cornerFamily">rounded</item>
        <item name="cornerSize">20dp</item>
    </style>

    <style name="Widget.App.Button" parent="Widget.MaterialComponents.Button.TextButton.Dialog">
        <item name="shapeAppearance">@style/ShapeAppearance.App.SmallComponent</item>
        <item name="android:textAppearance">@style/Roboto.Bold.Small</item>
        <item name="android:textColor">@color/colorAccent</item>
        <item name="android:textAllCaps">true</item>
    </style>

最后，在创建对话框时，不要忘记设置以下样式：

 MaterialAlertDialogBuilder(this, R.style.ThemeOverlay_App_MaterialAlertDialog)
            .setMessage("your message")
            .show()

Answer 6

自定义警告对话框标题textview

             TextView tv_message = new TextView(this);

            Typeface typeface = Typeface.createFromAsset(
                    getAssets(),
                    "fonts/OpenSans-Semibold.ttf"
            );


            // Set the text view layout parameters
            tv_message.setLayoutParams(
                    new 
      ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, 
      ViewGroup.LayoutParams.WRAP_CONTENT)
            );

            // Set message text color
            tv_message.setTextColor(Color.RED);

            // Set message gravity/text align
            tv_message.setGravity(Gravity.START);

            // Set message text size
            tv_message.setTextSize(TypedValue.COMPLEX_UNIT_DIP, 16);

            // Set message custom font
            tv_message.setTypeface(typeface);

            // Set message background color
            tv_message.setBackgroundColor(Color.YELLOW);

            // Set message text padding
            tv_message.setPadding(15, 25, 15, 15);

            tv_message.setText("Are you sure?");
            tv_message.setTextColor(Color.BLACK);

Answer 7

您可以使用SpannableString，在其上设置字体并将其返回给AlertDialog.Builder

这是一个辅助函数，它向CharSequence添加字体并返回SpannableString-

private static SpannableString typeface(Typeface typeface, CharSequence chars) {
    if (chars == null) {
        return null;
    }
    SpannableString s = new SpannableString(chars);
    s.setSpan(new TypefaceSpan(typeface), 0, s.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
    return s;
}

在文本上设置TypeFace的类-

public class TypefaceSpan extends MetricAffectingSpan {

    private final Typeface typeface;

    public TypefaceSpan(Typeface typeface) {
        this.typeface = typeface;
    }

    @Override
    public void updateDrawState(TextPaint tp) {
        tp.setTypeface(typeface);
        tp.setFlags(tp.getFlags() | Paint.SUBPIXEL_TEXT_FLAG);
    }

    @Override
    public void updateMeasureState(TextPaint p) {
        p.setTypeface(typeface);
        p.setFlags(p.getFlags() | Paint.SUBPIXEL_TEXT_FLAG);
    }
}

在创建对话框时，您可以像这样用SpannableString替换字符串-

public static Dialog createDialog(Context c, String title, String message, String pButton, String nButton, AlertCallback callback) {

    AlertDialog.Builder builder = new AlertDialog.Builder(c);

    builder.setMessage(typeface(Fonts.Regular, message));
    builder.setTitle(typeface(Fonts.Bold, title));
    builder.setPositiveButton(typeface(Fonts.Bold, pButton),callback::onPositiveButtonClick);
    builder.setNegativeButton(typeface(Fonts.Bold, nButton),callback::onNegativeButtonClick);

    AlertDialog dialog = builder.create();
    return builder.create();
}

我建议将字体加载到缓存中，而不要多次调用createFromAsset。希望这会有所帮助！

Answer 8

我有一个包含项目列表的警报对话框，因此我必须结合几个答案并对其进行一些简化，这是警报对话框本身的代码：

val dialog = AlertDialog.Builder(this, R.style.MyAlertDialogTheme).setTitle(R.string.sort_by)
   .setSingleChoiceItems(modelList, selectedSortPosition) { _, position -> selectedSortPosition = position }
   .setPositiveButton(R.string.ok) { _, _ ->  }
   .setNegativeButton(R.string.cancel) { _, _ -> }.create()
dialog.show()
setFontsForDialog(dialog)

在这里，我使用了Danilo的答案中的样式，但是为此添加了设置的主题颜色：

   <style name="MyAlertDialogTheme" parent="Theme.MaterialComponents.DayNight.Dialog.Alert">
      <item name="colorPrimary">@color/colorPrimary</item>
      <item name="colorAccent">@color/colorAccent</item>
      <item name="android:textAppearanceSmall">@style/MyTextAppearanceSmall</item>
      <item name="android:textAppearanceMedium">@style/MyTextAppearanceMedium</item>
      <item name="android:textAppearanceLarge">@style/MyTextAppearanceLarge</item>
   </style>

并且由于它仅更改列表项的字体，因此我添加了此方法，并且由于我打算在应用程序中多次使用它，因此我为活动本身创建了扩展方法：

private fun Activity.setFontsForDialog(dialog: AlertDialog) {
    val font = ResourcesCompat.getFont(this, R.font.theme_bold_pn)
    dialog.findViewById<TextView>(android.R.id.message)?.typeface = font
    dialog.findViewById<TextView>(android.R.id.button1)?.typeface = font
    dialog.findViewById<TextView>(android.R.id.button2)?.typeface = font
}

Answer 9

我为此目的为AlertDialog创建了扩展方法-
（从androidx.appcompat：appcompat：1.1.0开始有效）

fun AlertDialog.setTypefaceInDialog(context: Context) {

    val regularFont = ResourcesCompat.getFont(context, R.font.regular_font)
    val boldFont = ResourcesCompat.getFont(context, R.font.medium_font)

    findViewById<TextView>(androidx.appcompat.R.id.alertTitle)?.typeface = boldFont
    findViewById<TextView>(android.R.id.message)?.typeface = regularFont
    getButton(AlertDialog.BUTTON_POSITIVE).typeface = boldFont
    getButton(AlertDialog.BUTTON_NEGATIVE).typeface = boldFont
}

如何在android中为警报对话框设置自定义字体？

9 个答案: