AndroidX 前后 DialogPreference 的区别 [英] Difference between DialogPreference before and after AndroidX

问题描述

我们目前正在使用我们的 Android 应用项目迁移到 Androidx 命名空间.但是我注意到不仅命名空间似乎发生了变化.对于 DialogPreference 也缺少一些以前使用的接口

We are currently migrating to Androidx namespace with our Android app project. However I noticed that not only the namespace seems to have changed. For DialogPreference also some interfaces which were using before are now missing

• 新接口:https://developer.android.com/reference/androidx/preference/DialogPreference
• 旧接口:https://developer.android.com/reference/kotlin/android/preference/DialogPreference

例如，似乎缺少以下方法:onBindDialogView、showDialog、onDialogClosed.

For example the following methods seem to be missing: onBindDialogView, showDialog, onDialogClosed.

由于我们使用其中一些方法来影响对话框的默认行为，我不清楚现在应该如何实现此功能.例如，我们在关闭对话框之前验证输入，我们将值保存在数据库中而不是共享首选项中，并向对话框添加一些动态元素.

Since we use some of these methods to influence the default behavior of the dialog, it is unclear to me how I should realize this functionality now. For example we are validating the input before closing the dialog, we are saving the value in a database instead of the sharedpreferences and adding some dynamic elements to the dialog.

有没有其他人遇到过这个问题并找到了解决方案?我错过了文档中的任何内容吗?我们可以/应该使用另一个概念吗?

Has anyone else already encountered this problem and found a solution? Did I miss anything in the documentation? Is there another concept that we can / should use?

可以使用 Fragments 而不是 DialogPreference 但对于少量内容(例如，用户可以从中选择的树项列表)这对我来说似乎是很多开销...

It would be possible to use Fragments instead of DialogPreference but for small amounts of content (e.g. a list of tree items, where the user can choose from) this seems to be a lot of overhead for me...

推荐答案

从 androidx 源文件开始，我将基于旧的 DialogPreference 的自定义类迁移到新的 androidx.preference.DialogPreference 使用以下程序:

Starting from androidx source files, I've migrated custom classes based on old DialogPreference to new androidx.preference.DialogPreference with the following procedure:

基于旧版 DialogPreference 的旧自定义对话框类(例如 CustomDialogPreference)应拆分为两个单独的类:

The old custom dialog class (e.g. CustomDialogPreference) based on legacy DialogPreference should be split into two separate classes:

1. 一个类(例如 CustomPreference)应该扩展 androidx.preference.DialogPreference 并且只包含与首选项处理(数据管理)相关的代码.
2. 另一个类(例如 CustomDialog)应该扩展 androidx.preference.PreferenceDialogFragmentCompat 并且只包含与对话框处理(用户界面)相关的代码，包括 onDialogClosed.此类应公开一个静态方法 newInstance 以返回此类的实例.

1. One class (e.g. CustomPreference) should extend androidx.preference.DialogPreference and will contain only the code related to preference handling (data management).
2. Another class (e.g. CustomDialog) should extend androidx.preference.PreferenceDialogFragmentCompat and will contain only the code related to dialog handling (user interface), including onDialogClosed. This class should expose a static method newInstance to return an instance of this class.

步骤 2

在基于 PreferenceFragmentCompat 的主要片段处理首选项中，应该覆盖 onDisplayPreferenceDialog 方法以显示自定义对话框，例如:

Step 2

In the main fragment handling preferences based on PreferenceFragmentCompat the onDisplayPreferenceDialog method should be overridden to show the custom dialog, e.g.:

    private static final String DIALOG_FRAGMENT_TAG = "CustomPreference";

    @Override
    public void onDisplayPreferenceDialog(Preference preference) {
        if (getParentFragmentManager().findFragmentByTag(DIALOG_FRAGMENT_TAG) != null) {
            return;
        }

        if (preference instanceof CustomPreference) {
            final DialogFragment f = CustomDialog.newInstance(preference.getKey());
            f.setTargetFragment(this, 0);
            f.show(getParentFragmentManager(), DIALOG_FRAGMENT_TAG);
        } else {
            super.onDisplayPreferenceDialog(preference);
        }
    }

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