android - 使用 androidx.preference.PreferenceScreen 和 PreferenceScreen 的区别

Question

我的应用以 API 28 为目标，并且至少有 API 15。作为支持库，我使用的是 AndroidX。
我有一个由 Activity 托管的偏好 fragment ，如下所示:

SettingsFragment.java

package com.example.app;

import android.os.Bundle;

import androidx.preference.PreferenceFragmentCompat;

public class SettingsFragment extends PreferenceFragmentCompat {

    @Override
    public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
        setPreferencesFromResource(R.xml.preferences, rootKey);

    }
}

SettingsActivity.java

package com.example.app;

import android.os.Bundle;

import androidx.appcompat.app.AppCompatActivity;

public class SettingsActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getSupportFragmentManager().beginTransaction().replace(android.R.id.content, new SettingsFragment()).commit();
    }
}

这是 SettingsFragment.java 使用的 XML 布局

preferences.xml

<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
    <SwitchPreference
        android:defaultValue="false"
        android:key="pref_switch"
        android:title="@string/switch" />
</PreferenceScreen>

作为首选项层次结构的根，我应该使用 PreferenceScreen 还是 androidx.preference.PreferenceScreen 让布局真正向后兼容(使用 AndroidX)？两者有什么区别？最佳做法是什么？

Answer 1

来自 the docs :

AndroidX is the open-source project that the Android team uses to develop, test, package, version and release libraries within Jetpack.

AndroidX is a major improvement to the original Android Support Library. Like the Support Library, AndroidX ships separately from the Android OS and provides backwards-compatibility across Android releases. AndroidX fully replaces the Support Library by providing feature parity and new libraries. In addition AndroidX includes the following features:

• All packages in AndroidX live in a consistent namespace starting with the string androidx. The Support Library packages have been mapped into corresponding androidx.* packages. For a full mapping of all the old classes and build artifacts to the new ones, see the Package Refactoring page.

所以简单来说，它是您应该使用的新库，而不是支持库，因为它具有最新的组件和功能。

因此，您的 PreferenceScreen 与 androidx.preference.PreferenceScreen 相同，但 bundle 了不同的包装器。