4
我做了一个简单的PreferenceScreen与多个Preference Categorys和CheckBoxPreferences。为什么不能用SwitchPreference交换CheckBoxPreference？
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
<PreferenceCategory android:title="General">
<CheckBoxPreference
android:title="GPS"
android:key="gps_preference"
android:summary="Enales the GPS tracking of your device"
android:defaultValue="true"
></CheckBoxPreference>
<SwitchPreference
android:title="WLAN"
android:key="wlan_preference"
android:summary="Enables the WLAN usage"
android:defaultValue="true"></SwitchPreference>
<CheckBoxPreference
android:title="Benachrichtigungen"
android:key="benachrichtigung_preference"
android:summary="Enables the Push messages"
android:defaultValue="true"
></CheckBoxPreference>
</PreferenceCategory>
</PreferenceScreen>
此首选项屏幕在android.support.v7.preference.PreferenceFragmentCompat之内。如果我像这样离开everyhing，那么一切正常。
但是如果我想转出去SwitchPreference一个CheckBoxPreference我得到一个渲染错误在我design标签（应该通过简单地切换出来的XML标记的CheckBoxPreference与SwitchPreference工作）：
在渲染过程中发生异常： android.preference.CheckBoxPreference不能转换到 android.preference.GenericInflater $父
堆栈跟踪：
android.view.InflateException: Binary XML file line #15: Error inflating class (not found)SwitchPreference
at android.support.v7.preference.PreferenceInflater.createItemFromTag(PreferenceInflater.java:301)
at android.support.v7.preference.PreferenceInflater.rInflate(PreferenceInflater.java:359)
at android.support.v7.preference.PreferenceInflater.rInflate(PreferenceInflater.java:361)
at android.support.v7.preference.PreferenceInflater.inflate(PreferenceInflater.java:167)
at android.support.v7.preference.PreferenceInflater.inflate(PreferenceInflater.java:117)
at android.support.v7.preference.PreferenceManager.inflateFromResource(PreferenceManager.java:115)
at android.support.v7.preference.PreferenceFragmentCompat.setPreferencesFromResource(PreferenceFragmentCompat.java:424)
at com.julianriegraf.app2night.SettingsFragment.onCreatePreferences(SettingsFragment.java:22)
at android.support.v7.preference.PreferenceFragmentCompat.onCreate(PreferenceFragmentCompat.java:216)
at android.support.v4.app.Fragment.performCreate(Fragment.java:2062)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1051)
at android.support.v4.app.BackStackRecord.setLastIn(BackStackRecord.java:795)
at android.support.v4.app.BackStackRecord.calculateFragments(BackStackRecord.java:835)
at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:676)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1671)
at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:532)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.ClassNotFoundException: Didn't find class "android.support.v7.preference.SwitchPreference" on path: DexPathList[[zip file "/data/app/com.julianriegraf.app2night-2/base.apk"],nativeLibraryDirectories=[/data/app/com.julianriegraf.app2night-2/lib/x86, /vendor/lib, /system/lib]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
at android.support.v7.preference.PreferenceInflater.createItem(PreferenceInflater.java:233)
at android.support.v7.preference.PreferenceInflater.onCreateItem(PreferenceInflater.java:281)
at android.support.v7.preference.PreferenceInflater.createItemFromTag(PreferenceInflater.java:290)
at android.support.v7.preference.PreferenceInflater.rInflate(PreferenceInflater.java:359)
at android.support.v7.preference.PreferenceInflater.rInflate(PreferenceInflater.java:361)
at android.support.v7.preference.PreferenceInflater.inflate(PreferenceInflater.java:167)
at android.support.v7.preference.PreferenceInflater.inflate(PreferenceInflater.java:117)
at android.support.v7.preference.PreferenceManager.inflateFromResource(PreferenceManager.java:115)
at android.support.v7.preference.PreferenceFragmentCompat.setPreferencesFromResource(PreferenceFragmentCompat.java:424)
at com.julianriegraf.app2night.SettingsFragment.onCreatePreferences(SettingsFragment.java:22)
at android.support.v7.preference.PreferenceFragmentCompat.onCreate(PreferenceFragmentCompat.java:216)
at android.support.v4.app.Fragment.performCreate(Fragment.java:2062)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1051)
at android.support.v4.app.BackStackRecord.setLastIn(BackStackRecord.java:795)
at android.support.v4.app.BackStackRecord.calculateFragments(BackStackRecord.java:835)
at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:676)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1671)
at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:532)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
如果修改后的XML在您运行应用程序时起作用，并且只有设计选项卡抱怨，那么很可能这是Android Studio中的一个错误。 – CommonsWare
是的，但它不是在我的设备上工作，以及... – user343037
你应该在那里得到一些其他的错误。 [检查LogCat]（http://stackoverflow.com/questions/23353173/unwanted-myapp-has-stopped-how-can-i-solve-this）看看你是如何崩溃。 – CommonsWare