更改AlertDialog的背景

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <style name="CustomAlertDialogStyle" parent="Theme.AppCompat.Light.Dialog.Alert">
        <item name="android:background">@drawable/custom_dialog_background</item>
    </style>
</resources>

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <solid android:color="#FFFFFF" /> <!-- 设置背景颜色 -->
    <corners android:radius="10dp" /> <!-- 设置圆角 -->
</shape>

AlertDialog.Builder builder = new AlertDialog.Builder(context, R.style.CustomAlertDialogStyle);
builder.setTitle("Title")
       .setMessage("Message")
       .setPositiveButton("OK", new DialogInterface.OnClickListener() {
           @Override
           public void onClick(DialogInterface dialog, int which) {
               // 点击确定按钮的逻辑处理
           }
       })
       .setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
           @Override
           public void onClick(DialogInterface dialog, int which) {
               // 点击取消按钮的逻辑处理
           }
       })
       .show();