我一直在尝试使用android.preference.DialogPreference
来自 XML 的膨胀,但文档似乎缺少一些重要的部分,而且我在任何地方都找不到工作示例。我的 XML 现在看起来像这样(我尝试了许多排列,但这似乎是合理的最小值):
<DialogPreference
android:key="funThing" android:title="Fun Thing"
android:dialogLayout="@layout/fun_layout"
android:positiveButtonText="OK"
android:negativeButtonText="Cancel"
/>
我在这一点上的假设是它需要子类化DialogPreference
而不是直接使用它。一方面,我找不到将实际偏好值与对话框本身中的元素相关联的方法,这在反思时是一种赠品。而且,查看来源DialogPreference.java
似乎也证实了这一点。而且我也刚刚注意到官方文档将其称为“基类”。但至少,在网上建立一个足够明确的来源会很好,这将帮助接下来的 N 人比我更快地解决这个问题。
作为记录,日志文件如下所示:
I/ActivityManager( 61): Starting: Intent { cmp=org.jeremy.android/.PreferencesActivity } from pid 2755
W/Resources( 2755): Converting to string: TypedValue{t=0x10/d=0x4b0 a=-1}
W/Resources( 2755): Converting to string: TypedValue{t=0x10/d=0x20 a=-1}
D/AndroidRuntime( 2755): Shutting down VM
W/dalvikvm( 2755): threadid=1: thread exiting with uncaught exception (group=0x40015560)
E/AndroidRuntime( 2755): FATAL EXCEPTION: main
E/AndroidRuntime( 2755): java.lang.RuntimeException: Unable to start activity ComponentInfo{org.jeremy.android/org.jeremy.android.PreferencesActivity}: android.view.InflateException: Binary XML file line #28: Error inflating class java.lang.reflect.Constructor
E/AndroidRuntime( 2755): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
E/AndroidRuntime( 2755): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
E/AndroidRuntime( 2755): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
E/AndroidRuntime( 2755): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
E/AndroidRuntime( 2755): at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime( 2755): at android.os.Looper.loop(Looper.java:123)
E/AndroidRuntime( 2755): at android.app.ActivityThread.main(ActivityThread.java:3683)
E/AndroidRuntime( 2755): at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime( 2755): at java.lang.reflect.Method.invoke(Method.java:507)
E/AndroidRuntime( 2755): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
E/AndroidRuntime( 2755): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
E/AndroidRuntime( 2755): at dalvik.system.NativeStart.main(Native Method)
E/AndroidRuntime( 2755): Caused by: android.view.InflateException: Binary XML file line #28: Error inflating class java.lang.reflect.Constructor
E/AndroidRuntime( 2755): at android.preference.GenericInflater.createItem(GenericInflater.java:397)
E/AndroidRuntime( 2755): at android.preference.GenericInflater.onCreateItem(GenericInflater.java:417)
E/AndroidRuntime( 2755): at android.preference.GenericInflater.createItemFromTag(GenericInflater.java:428)
E/AndroidRuntime( 2755): at android.preference.GenericInflater.rInflate(GenericInflater.java:481)
E/AndroidRuntime( 2755): at android.preference.GenericInflater.rInflate(GenericInflater.java:493)
E/AndroidRuntime( 2755): at android.preference.GenericInflater.inflate(GenericInflater.java:326)
E/AndroidRuntime( 2755): at android.preference.GenericInflater.inflate(GenericInflater.java:263)
E/AndroidRuntime( 2755): at android.preference.PreferenceManager.inflateFromResource(PreferenceManager.java:251)
E/AndroidRuntime( 2755): at android.preference.PreferenceActivity.addPreferencesFromResource(PreferenceActivity.java:262)
E/AndroidRuntime( 2755): at org.jeremy.android.PreferencesActivity.onCreate(PreferencesActivity.java:40)
E/AndroidRuntime( 2755): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
E/AndroidRuntime( 2755): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
E/AndroidRuntime( 2755): ... 11 more
E/AndroidRuntime( 2755): Caused by: java.lang.InstantiationException: android.preference.DialogPreference
E/AndroidRuntime( 2755): at java.lang.reflect.Constructor.constructNative(Native Method)
E/AndroidRuntime( 2755): at java.lang.reflect.Constructor.newInstance(Constructor.java:415)
E/AndroidRuntime( 2755): at android.preference.GenericInflater.createItem(GenericInflater.java:383)
E/AndroidRuntime( 2755): ... 22 more
W/ActivityManager( 61): Force finishing activity org.jeremy.android/.PreferencesActivity
W/ActivityManager( 61): Force finishing activity org.jeremy.android/.SplashActivity