错误膨胀类RingtonePreference

Question

我试图从一本书中重复一个例子，它的源代码已经在同一个手机上测试过了，但它并没有工作。我比较了源代码和它们完全相同。

错误是：

04-05 15:30:33.004: E/AndroidRuntime(20354): FATAL EXCEPTION: main 
04-05 15:30:33.004: E/AndroidRuntime(20354): Process: org.crazyit.app, PID: 20354 
04-05 15:30:33.004: E/AndroidRuntime(20354): java.lang.RuntimeException: Unable to start activity ComponentInfo{org.crazyit.app/org.crazyit.app.PreferenceActivityTest}: android.view.InflateException: Binary XML file line #5: Error inflating class RingtongPreference 
04-05 15:30:33.004: E/AndroidRuntime(20354): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2200) 
04-05 15:30:33.004: E/AndroidRuntime(20354): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2250) 
04-05 15:30:33.004: E/AndroidRuntime(20354): at android.app.ActivityThread.access$800(ActivityThread.java:139) 
04-05 15:30:33.004: E/AndroidRuntime(20354): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1200) 
04-05 15:30:33.004: E/AndroidRuntime(20354): at android.os.Handler.dispatchMessage(Handler.java:102) 
04-05 15:30:33.004: E/AndroidRuntime(20354): at android.os.Looper.loop(Looper.java:136) 
04-05 15:30:33.004: E/AndroidRuntime(20354): at android.app.ActivityThread.main(ActivityThread.java:5105) 
04-05 15:30:33.004: E/AndroidRuntime(20354): at java.lang.reflect.Method.invokeNative(Native Method) 
04-05 15:30:33.004: E/AndroidRuntime(20354): at java.lang.reflect.Method.invoke(Method.java:515) 
04-05 15:30:33.004: E/AndroidRuntime(20354): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:792) 
04-05 15:30:33.004: E/AndroidRuntime(20354): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:608) 
04-05 15:30:33.004: E/AndroidRuntime(20354): at dalvik.system.NativeStart.main(Native Method) 
04-05 15:30:33.004: E/AndroidRuntime(20354): Caused by: android.view.InflateException: Binary XML file line #5: Error inflating class RingtongPreference 
04-05 15:30:33.004: E/AndroidRuntime(20354): at android.preference.GenericInflater.createItemFromTag(GenericInflater.java:441) 
04-05 15:30:33.004: E/AndroidRuntime(20354): at android.preference.GenericInflater.rInflate(GenericInflater.java:481) 
04-05 15:30:33.004: E/AndroidRuntime(20354): at android.preference.GenericInflater.inflate(GenericInflater.java:326) 
04-05 15:30:33.004: E/AndroidRuntime(20354): at android.preference.GenericInflater.inflate(GenericInflater.java:263) 
04-05 15:30:33.004: E/AndroidRuntime(20354): at android.preference.PreferenceManager.inflateFromResource(PreferenceManager.java:272) 
04-05 15:30:33.004: E/AndroidRuntime(20354): at android.preference.PreferenceFragment.addPreferencesFromResource(PreferenceFragment.java:285) 
04-05 15:30:33.004: E/AndroidRuntime(20354): at org.crazyit.app.PreferenceActivityTest$Prefs1Fragment.onCreate(PreferenceActivityTest.java:54) 
04-05 15:30:33.004: E/AndroidRuntime(20354): at android.app.Fragment.performCreate(Fragment.java:1688) 
04-05 15:30:33.004: E/AndroidRuntime(20354): at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:860) 
04-05 15:30:33.004: E/AndroidRuntime(20354): at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1063) 
04-05 15:30:33.004: E/AndroidRuntime(20354): at android.app.BackStackRecord.run(BackStackRecord.java:684) 
04-05 15:30:33.004: E/AndroidRuntime(20354): at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1450) 
04-05 15:30:33.004: E/AndroidRuntime(20354): at android.app.Activity.performStart(Activity.java:5284) 
04-05 15:30:33.004: E/AndroidRuntime(20354): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2173) 
04-05 15:30:33.004: E/AndroidRuntime(20354): ... 11 more 
04-05 15:30:33.004: E/AndroidRuntime(20354): Caused by: java.lang.ClassNotFoundException: Didn't find class "android.preference.RingtongPreference" on path: DexPathList[[zip file "/data/app/org.crazyit.app-1.apk"],nativeLibraryDirectories=[/data/app-lib/org.crazyit.app-1, /vendor/lib, /system/lib]] 
04-05 15:30:33.004: E/AndroidRuntime(20354): at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56) 
04-05 15:30:33.004: E/AndroidRuntime(20354): at java.lang.ClassLoader.loadClass(ClassLoader.java:497) 
04-05 15:30:33.004: E/AndroidRuntime(20354): at java.lang.ClassLoader.loadClass(ClassLoader.java:457) 
04-05 15:30:33.004: E/AndroidRuntime(20354): at android.preference.GenericInflater.createItem(GenericInflater.java:375) 
04-05 15:30:33.004: E/AndroidRuntime(20354): at android.preference.GenericInflater.onCreateItem(GenericInflater.java:417) 
04-05 15:30:33.004: E/AndroidRuntime(20354): at android.preference.GenericInflater.createItemFromTag(GenericInflater.java:428) 
04-05 15:30:33.004: E/AndroidRuntime(20354): ... 24 more 

含RingtonePrefrences XML文件是：

<?xml version="1.0" encoding="utf-8"?> 
    <PreferenceScreen 
     xmlns:android="http://schemas.android.com/apk/res/android" > 
     <RingtongPreference 
      android:ringtoneType="all" 
      android:title="Ringtone Settings" 
      android:summary="Choose Ringtones(Test RingtonePrerference)" 
      android:showDefault="true" 
      android:key="ring_key" 
      android:showSilent="true"> 
     </RingtongPreference> 
     <PreferenceCategory android:title="Personal Info"> 
      <EditTextPreference 
       android:key="name" 
       android:title="Please fill in your username" 
       android:summary="Please fill in your username(Test EditTextPreference)" 
       android:dialogTitle="Your username："/> 
      <ListPreference 
       android:key="gender" 
       android:title="Gender" 
       android:summary="Gender(Test ListPreference)" 
       android:dialogTitle="ListPreference" 
       android:entries="@array/gender_name_list" 
       android:entryValues="@array/gender_value_list"/> 
     </PreferenceCategory> 
     <PreferenceCategory android:title="System Settings"> 
      <CheckBoxPreference 
       android:key="autoSave" 
       android:title="AutoSave" 
       android:summaryOn="AutoSave: On" 
       android:summaryOff="AutoSave: Off" 
       android:defaultValue="true"/> 
     </PreferenceCategory> 
    </PreferenceScreen> 

及活性膨胀的XML是：

package org.crazyit.app; 

import java.util.List; 

import android.os.Bundle; 
import android.preference.PreferenceActivity; 
import android.preference.PreferenceFragment; 
import android.widget.Button; 
import android.widget.Toast; 

public class PreferenceActivityTest extends PreferenceActivity 
{ 
    @Override 
    public void onCreate(Bundle savedInstanceState) 
    { 
     super.onCreate(savedInstanceState); 
     if(hasHeaders()) 
     { 
      Button button = new Button(this); 
      button.setText("Settings"); 
      setListFooter(button); 
     } 
    } 

    @Override 
    public void onBuildHeaders(List<Header> target) 
    { 
     loadHeadersFromResource(R.xml.preference_headers, target); 
    } 

    public static class Prefs1Fragment extends PreferenceFragment 
    { 
     @Override 
     public void onCreate(Bundle savedInstanceState) 
     { 
      super.onCreate(savedInstanceState); 
      addPreferencesFromResource(R.xml.preferences); 
     } 
    } 
    public static class Prefs2Fragment extends PreferenceFragment 
    { 
     @Override 
     public void onCreate(Bundle savedInstanceState) 
     { 
      super.onCreate(savedInstanceState); 
      addPreferencesFromResource(R.xml.display_prefs); 
      String website = getArguments().getString("website"); 
      Toast.makeText(getActivity(), 
        website, Toast.LENGTH_LONG).show(); 
     } 
    } 
} 

以防万一，我将包括AndroidManifest在这里：

<?xml version="1.0" encoding="utf-8"?> 
<manifest 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    package="org.crazyit.app" 
    android:versionCode="1" 
    android:versionName="1.0"> 
    <uses-sdk 
     android:minSdkVersion="11" 
     android:targetSdkVersion="17" /> 
    <application 
     android:icon="@drawable/ic_launcher" 
     android:label="@string/app_name"> 
<activity 
    android:name=".OtherActivity" 
    android:label="@string/app_name"> 
    <intent-filter> 
     <action android:name="android.intent.action.MAIN" /> 
     <category android:name="android.intent.category.LAUNCHER" /> 
    </intent-filter> 
</activity> 
<activity 
    android:name=".ExpandableListActivityTest" 
    android:label="See Categories"> 
</activity> 
<activity 
    android:name=".PreferenceActivityTest" 
    android:label="Settings"> 
</activity> 
    </application> 
</manifest> 

我试图在整个下午查找错误而没有发现它。请帮忙。谢谢。

Answer 1

Android没有RingtongPreference，这是您的偏好XML所要求的。我的猜测是这是一个错字，你的意思是RingtonePreference，就像你的问题标题。