在 DialogPreference 中单击按钮时开始片段

Question

我有一个 PreferenceActivity，我试图在单击首选项时创建一个对话框首选项。我首先尝试将我的 DialogPreference 类（MyPreferencefragment）保留在 PreferenceActivity 类之外，并且布局是

  <com.example.second.MyPreferencefragment
    android:dialogMessage="Demo"
    android:key="resetDialog"
    android:negativeButtonText="No"
    android:persistent="false"
    android:positiveButtonText="Yes"
    android:summary="Place the time here"
    android:title="Demo App"  />

这很好，但我的对话框首选项有一个按钮，单击该按钮我需要打开一个片段。如何做到这一点？我在 Dialogpreference 中没有 FragmentManager。

我尝试在我的 PreferenceActivity 中将 DialogPreference 创建为内部类，但对话框首选项的布局如下。

 <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">


     <DialogPreference class = "com.example.second.PrefsActivity$MyPreferencefragment"
    android:dialogMessage="Demo"
    android:key="resetDialog"
    android:negativeButtonText="No"
    android:persistent="false"
    android:positiveButtonText="Yes"
    android:summary="Place the time here"
    android:title="Demo App"  />

这会引发异常

    Caused by: java.lang.InstantiationException: can't instantiate class android.preference.DialogPreference
  01-15 05:54:01.427: E/AndroidRuntime(12843):  at java.lang.reflect.Constructor.constructNative(Native Method)

这是无用的，因为 DialogPreference 是一个抽象类。

我只需要在对话框首选项中单击按钮时启动一个片段。如何做到这一点？任何建议都会有所帮助。提前致谢。

Edit:: 添加整个堆栈

01-15 05:27:41.325: E/AndroidRuntime(8932): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.second/com.example.second.PrefsActivity}: android.view.InflateException: Binary XML file line #5: Error inflating class java.lang.reflect.Constructor
01-15 05:27:41.325: E/AndroidRuntime(8932):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2253)
 01-15 05:27:41.325: E/AndroidRuntime(8932):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2311)
 01-15 05:27:41.325: E/AndroidRuntime(8932):    at android.app.ActivityThread.access$700(ActivityThread.java:152)
 01-15 05:27:41.325: E/AndroidRuntime(8932):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1438)
 01-15 05:27:41.325: E/AndroidRuntime(8932):    at android.os.Handler.dispatchMessage(Handler.java:102)
 01-15 05:27:41.325: E/AndroidRuntime(8932):    at android.os.Looper.loop(Looper.java:158)
  01-15 05:27:41.325: E/AndroidRuntime(8932):   at android.app.ActivityThread.main(ActivityThread.java:5236)
  01-15 05:27:41.325: E/AndroidRuntime(8932):   at java.lang.reflect.Method.invokeNative(Native Method)
 01-15 05:27:41.325: E/AndroidRuntime(8932):    at java.lang.reflect.Method.invoke(Method.java:515)
 01-15 05:27:41.325: E/AndroidRuntime(8932):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1257)
 01-15 05:27:41.325: E/AndroidRuntime(8932):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1073)
01-15 05:27:41.325: E/AndroidRuntime(8932):     at dalvik.system.NativeStart.main(Native Method)
 01-15 05:27:41.325: E/AndroidRuntime(8932): Caused by: android.view.InflateException: Binary XML file line #5: Error inflating class java.lang.reflect.Constructor
 01-15 05:27:41.325: E/AndroidRuntime(8932):    at android.preference.GenericInflater.createItem(GenericInflater.java:397)
 01-15 05:27:41.325: E/AndroidRuntime(8932):    at android.preference.GenericInflater.onCreateItem(GenericInflater.java:417)
 01-15 05:27:41.325: E/AndroidRuntime(8932):    at android.preference.GenericInflater.createItemFromTag(GenericInflater.java:428)
 01-15 05:27:41.325: E/AndroidRuntime(8932):    at android.preference.GenericInflater.rInflate(GenericInflater.java:481)
 01-15 05:27:41.325: E/AndroidRuntime(8932):    at android.preference.GenericInflater.inflate(GenericInflater.java:326)
 01-15 05:27:41.325: E/AndroidRuntime(8932):    at android.preference.GenericInflater.inflate(GenericInflater.java:263)
 01-15 05:27:41.325: E/AndroidRuntime(8932):    at android.preference.PreferenceManager.inflateFromResource(PreferenceManager.java:272)
 01-15 05:27:41.325: E/AndroidRuntime(8932):    at android.preference.PreferenceActivity.addPreferencesFromResource(PreferenceActivity.java:1778)
 01-15 05:27:41.325: E/AndroidRuntime(8932):    at com.example.tapholdcustom.PrefsActivity.onCreate(PrefsActivity.java:38)
 01-15 05:27:41.325: E/AndroidRuntime(8932):    at android.app.Activity.performCreate(Activity.java:5389)
 01-15 05:27:41.325: E/AndroidRuntime(8932):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1104)
 01-15 05:27:41.325: E/AndroidRuntime(8932):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2217)
 01-15 05:27:41.325: E/AndroidRuntime(8932):    ... 11 more
  01-15 05:27:41.325: E/AndroidRuntime(8932): Caused by: java.lang.InstantiationException: can't instantiate class android.preference.DialogPreference
 01-15 05:27:41.325: E/AndroidRuntime(8932):    at java.lang.reflect.Constructor.constructNative(Native Method)
 01-15 05:27:41.325: E/AndroidRuntime(8932):    at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
 01-15 05:27:41.325: E/AndroidRuntime(8932):    at android.preference.GenericInflater.createItem(GenericInflater.java:383)
01-15 05:27:41.325: E/AndroidRuntime(8932):     ... 22 more

我主要担心的是：

1. 单击首选项时打开自定义对话框首选项

2. 单击自定义对话框首选项中的按钮打开片段（自定义对话框首选项中有三个按钮）

我可以通过不使用 dialogpreference 作为内部类来实现 1，因为它给了我上面提到的堆栈跟踪。但是如何达到第二点呢？

Answer 1

您需要有一个容器（通常是框架布局），然后通过片段事务将片段交换到该容器中。仅这个异常不是很有描述性，我不确定你在得到它之前做了什么 - 你至少需要存在两个参数的构造函数才能通过 XML 使用片段，否则如果你有，请确保你有一个空的构造函数试图这样称呼它（在代码中）。

发布其余的堆栈跟踪，应该有一个原因。

getSupportFragmentManager().beginTransaction().replace(R.id.your_container_id, new YourFragment()).commit();