将字体大小更改为AlertDialog

    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="16dp">

   <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="这是一个AlertDialog"
        android:textSize="18sp" />

</LinearLayout>

AlertDialog.Builder builder = new AlertDialog.Builder(this);
LayoutInflater inflater = this.getLayoutInflater();
View dialogView = inflater.inflate(R.layout.alert_dialog_layout, null);
builder.setView(dialogView)
       .setTitle("AlertDialog标题")
       .setPositiveButton("确定", new DialogInterface.OnClickListener() {
           public void onClick(DialogInterface dialog, int id) {
               // 点击确定按钮后的操作
           }
       })
       .setNegativeButton("取消", new DialogInterface.OnClickListener() {
           public void onClick(DialogInterface dialog, int id) {
               // 点击取消按钮后的操作
           }
       });
AlertDialog alertDialog = builder.create();
alertDialog.show();