创建“偏好设置"屏幕时找不到androidx.preference.PreferenceScreen

问题描述

限时删除！！

按照本教程创建偏好设置屏幕之后，似乎是膨胀类'androidx.preference.PreferenceScreen'的问题.为什么在res/xml文件夹中声明了我的首选项并将必需的依赖项添加到此项目后，为什么找不到它?

After following this tutorial to create a screen for preferences, there seems to be a problem with inflating the class 'androidx.preference.PreferenceScreen'. Why is it not found when my preferences have been declared inside the res/xml folder and the necessary dependency has been added to this project?

我的应用程序的minSdkVersion是24.

My app's minSdkVersion is 24.

依赖项

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    implementation 'com.android.support:appcompat-v7:28.0.0'
    implementation 'com.android.support:cardview-v7:28.0.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    implementation 'com.android.support:preference-v7:28.0.0'
    implementation 'com.android.support:recyclerview-v7:28.0.0'
    implementation 'com.android.support:support-v4:28.0.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}

res/xml/preferences.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.preference.PreferenceScreen
    xmlns:android="http://schemas.android.com/apk/res/android">

    <CheckBoxPreference
        android:key="preference_a"
        android:defaultValue="false"
        android:title="Preference A" />

</androidx.preference.PreferenceScreen>

活动布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/settings_container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MySettingsActivity" />

活动课

class MySettingsActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        supportFragmentManager
                .beginTransaction()
                .replace(R.id.settings_container, MySettingsFragment())
                .commit()
    }
}

片段类

class MySettingsFragment : PreferenceFragmentCompat() {
    override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
        addPreferencesFromResource(R.xml.app_preferences)
    }
}

推荐答案

如果您使用的是AndroidX，则应更新依赖项:

If you're using AndroidX, you should update your dependencies:

implementation "androidx.legacy:legacy-preference-v14:1.0.0"
implementation "androidx.preference:preference:1.0.0"

旧版文件用于旧版com.android.support:preference-v14，另一旧版文件用于com.android.support:preference-v7.

The legacy is for the old com.android.support:preference-v14 while the other is for com.android.support:preference-v7.

如果您不使用AndroidX，而是使用Android支持库，请不要将AndroidX小部件导入XML.

If you don't use AndroidX but Android Support libraries, do not import AndroidX widgets into your XML.

这篇关于创建“偏好设置"屏幕时找不到androidx.preference.PreferenceScreen的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！

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