[英]App crash when i press the list preference in PreferfenceFragmentCompat
当我按下列表首选项时,应用程序崩溃并显示以下异常:-
FATAL EXCEPTION: main
Process: co.veemu.populermovies, PID: 25247
java.lang.ClassCastException: android.support.v7.preference.PreferenceScreen cannot be cast to android.support.v7.preference.DialogPreference
at android.support.v7.preference.PreferenceDialogFragmentCompat.onCreate(PreferenceDialogFragmentCompat.java:89)
at android.support.v7.preference.ListPreferenceDialogFragmentCompat.onCreate(ListPreferenceDialogFragmentCompat.java:48)
at android.support.v4.app.Fragment.performCreate(Fragment.java:2180)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1244)
at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1528)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1595)
at android.support.v4.app.BackStackRecord.executeOps(BackStackRecord.java:758)
at android.support.v4.app.FragmentManagerImpl.executeOps(FragmentManager.java:2363)
at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2149)
at android.support.v4.app.FragmentManagerImpl.optimizeAndExecuteOps(FragmentManager.java:2103)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2013)
at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:710)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6178)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:891)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:781)
这就是我做的listpreference:-
我添加了这个gradle依赖
compile 'com.android.support:preference-v7:25.3.1'
2-并在res / xml文件夹中创建首选项文件,这是包含的文件
<ListPreference
android:title="@string/pref_sort_order_title"
android:defaultValue="@string/pref_sort_des_value"
android:entries="@array/pref_sort_entres"
android:entryValues="@array/pref_sort_entres_value"
android:summary="sort order"
/>
3-使用布局资源文件进行活动,布局的根标记是片段,该片段指向从PreferenceFragmentCompat扩展的类
4-制作PreferenceFragmentCompat并在onCreatePreference()中填充首选项
@Override
public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
addPreferencesFromResource(R.xml.preference_sort);
}
5-我在AppTheme中添加了主题:-
<resources>
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">@color/colorPrimary</item>
<item name="colorPrimaryDark">@color/colorPrimaryDark</item>
<item name="colorAccent">@color/colorAccent</item>
<!-- this is the preference theme -->
<item name="preferenceTheme">@style/PreferenceThemeOverlay</item>
</style>
但是应用程序崩溃并出现上述异常,我不知道代码出了什么问题
我知道已经有点晚了,但是最近我遇到了同样的问题,所以我搜索并找到了解决方案。
实际上,这很容易解决,
Dialog Preference
需要具有唯一的android:key
才能正常工作,因此您要做的就是将android:key
属性添加到XML文件中的ListPreference
中。
<ListPreference
android:title="List"
android:key="list" <!-- Add this to your code -->
android:entries="@array/entries"
android:entryValues="@array/values"
android:defaultValue="Default">
</ListPreference>
希望这可以帮助您解决问题。
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