找不到ActivityNotFoundException的原因

我得到ActivityNotFoundException没有任何可见的原因。我是Android新手，所以我需要帮助。找不到ActivityNotFoundException的原因

我创建的菜单和运行活动从onOptionsItemSelected：

@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    super.onCreateOptionsMenu(menu); 
    MenuInflater inflater = getMenuInflater(); 
    inflater.inflate(R.menu.menu, menu); 
    return true; 
} 

@Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     switch (item.getItemId()) { 
     case R.id.settings: 
     startActivity(new Intent(this, Settings.class)); 
     return true; 
     } 
     return false; 
    }

设置类：

public class Settings extends PreferenceActivity { 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     addPreferencesFromResource(R.xml.settings); 
    } 
}

menu.xml文件：

<menu xmlns:android="http://schemas.android.com/apk/res/android" > 
<item 
    android:id="@+id/settings" 
    android:title="@string/action_settings"/> 
</menu>

的settings.xml：

<?xml version="1.0" encoding="utf-8"?> 
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" > 
<PreferenceCategory> 
<ListPreference 
    android:title="@string/menu_language_settings" 
    android:key="languagePreferences" 
    android:entries="@array/langPreferencesArray" 
    android:entryValues="@array/langPreferencesValues" /> 
<Preference 
    android:title="@string/menu_help" 
    android:key="helpPreferences" /> 
</PreferenceCategory> 
</PreferenceScreen>

当然，我在清单中添加活性声明：

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
package="com.example.symbolrecogniser" 
android:versionCode="1" 
android:versionName="1.0" > 

<uses-sdk 
    android:minSdkVersion="8" 
    android:targetSdkVersion="10" /> 

<application 
    android:allowBackup="true" 
    android:icon="@drawable/ic_launcher" 
    android:label="@string/app_name" 
    android:theme="@style/AppTheme" > 
    <activity 
     android:name="com.example.symbolrecogniser.StartAppActivity" 
     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="com.example.symbolrecogniser.Settings" 
     android:label="@string/settings_title"> 
    </activity> 
</application>

是否有人有什么想法？

这里是logcat的：

05-13 01:07:44.169: E/AndroidRuntime(23122): FATAL EXCEPTION: main 
05-13 01:07:44.169: E/AndroidRuntime(23122): android.content.ActivityNotFoundException: Unable to find explicit activity class {com.example.symbolrecogniser/android.provider.Settings}; have you declared this activity in your AndroidManifest.xml? 
05-13 01:07:44.169: E/AndroidRuntime(23122): at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1405) 
05-13 01:07:44.169: E/AndroidRuntime(23122): at android.app.Instrumentation.execStartActivity(Instrumentation.java:1379) 
05-13 01:07:44.169: E/AndroidRuntime(23122): at android.app.Activity.startActivityForResult(Activity.java:2827) 
05-13 01:07:44.169: E/AndroidRuntime(23122): at android.app.Activity.startActivity(Activity.java:2933) 
05-13 01:07:44.169: E/AndroidRuntime(23122): at com.example.symbolrecogniser.StartAppActivity.onOptionsItemSelected(StartAppActivity.java:34) 
05-13 01:07:44.169: E/AndroidRuntime(23122): at android.app.Activity.onMenuItemSelected(Activity.java:2205) 
05-13 01:07:44.169: E/AndroidRuntime(23122): at com.android.internal.policy.impl.PhoneWindow.onMenuItemSelected(PhoneWindow.java:756) 
05-13 01:07:44.169: E/AndroidRuntime(23122): at com.android.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:143) 
05-13 01:07:44.169: E/AndroidRuntime(23122): at com.android.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:855) 
05-13 01:07:44.169: E/AndroidRuntime(23122): at com.android.internal.view.menu.IconMenuView.invokeItem(IconMenuView.java:532) 
05-13 01:07:44.169: E/AndroidRuntime(23122): at com.android.internal.view.menu.IconMenuItemView.performClick(IconMenuItemView.java:122) 
05-13 01:07:44.169: E/AndroidRuntime(23122): at android.view.View$PerformClick.run(View.java:9080) 
05-13 01:07:44.169: E/AndroidRuntime(23122): at android.os.Handler.handleCallback(Handler.java:587) 
05-13 01:07:44.169: E/AndroidRuntime(23122): at android.os.Handler.dispatchMessage(Handler.java:92) 
05-13 01:07:44.169: E/AndroidRuntime(23122): at android.os.Looper.loop(Looper.java:123) 
05-13 01:07:44.169: E/AndroidRuntime(23122): at android.app.ActivityThread.main(ActivityThread.java:3729) 
05-13 01:07:44.169: E/AndroidRuntime(23122): at java.lang.reflect.Method.invokeNative(Native Method) 
05-13 01:07:44.169: E/AndroidRuntime(23122): at java.lang.reflect.Method.invoke(Method.java:507) 
05-13 01:07:44.169: E/AndroidRuntime(23122): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:874) 
05-13 01:07:44.169: E/AndroidRuntime(23122): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:632) 
05-13 01:07:44.169: E/AndroidRuntime(23122): at dalvik.system.NativeStart.main(Native Method)

来源

2013-05-12 zadorinka

也许向我们展示更多的堆栈跟踪 - 可能有其他的东西引起这种情况。 – slhck 2013-05-12 21:34:22

或向我们展示AndroidManifest.xml的其余部分 – Blundell 2013-05-12 22:00:51

在说明中添加了清单和logcat – zadorinka 2013-05-12 22:09:22

确定该包在<清单>标签的“一揽子”属性声明是一样的地方设置类是（不是子包）？

如果不是，则必须在清单中的“android：name”属性中声明包含全名的活动类。

来源

2013-05-12 21:40:36

添加到此答案中的实现在这种情况下：' ' – 2013-05-12 21:45:32

我试图这样做。没有改变。 – zadorinka 2013-05-12 21:58:58

检查第一个代码片段所来自的文件的“import”语句。某处有可能是

import android.provider.Settings;

其中导入了错误的Settings类。

来源

2013-05-12 22:31:44

非常好的观察..这一定是原因.. – 2013-05-13 01:47:41

非常感谢！这就是答案。 – zadorinka 2013-05-13 05:03:31

找不到ActivityNotFoundException的原因

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