從我的菜單打開首選項時，應用程序崩潰

Question

我的應用程序崩潰時，我從菜單中選擇了以下錯誤的首選項。

04-25 11:02:01.177: D/AndroidRuntime(888): Shutting down VM 
04-25 11:02:01.177: W/dalvikvm(888): threadid=1: thread exiting with uncaught exception (group=0x40a70930) 
04-25 11:02:01.227: E/AndroidRuntime(888): FATAL EXCEPTION: main 
04-25 11:02:01.227: E/AndroidRuntime(888): android.content.ActivityNotFoundException: No Activity found to handle Intent { act=com.thenewboston.travis.prefs } 
04-25 11:02:01.227: E/AndroidRuntime(888): at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1622) 
04-25 11:02:01.227: E/AndroidRuntime(888): at android.app.Instrumentation.execStartActivity(Instrumentation.java:1417) 
04-25 11:02:01.227: E/AndroidRuntime(888): at android.app.Activity.startActivityForResult(Activity.java:3370) 
04-25 11:02:01.227: E/AndroidRuntime(888): at android.app.Activity.startActivityForResult(Activity.java:3331) 
04-25 11:02:01.227: E/AndroidRuntime(888): at android.app.Activity.startActivity(Activity.java:3566) 
04-25 11:02:01.227: E/AndroidRuntime(888): at android.app.Activity.startActivity(Activity.java:3534) 
04-25 11:02:01.227: E/AndroidRuntime(888): at com.thenewboston.travis.Menu.onOptionsItemSelected(Menu.java:65) 
04-25 11:02:01.227: E/AndroidRuntime(888): at android.app.Activity.onMenuItemSelected(Activity.java:2548) 
04-25 11:02:01.227: E/AndroidRuntime(888): at com.android.internal.policy.impl.PhoneWindow.onMenuItemSelected(PhoneWindow.java:980) 
04-25 11:02:01.227: E/AndroidRuntime(888): at com.android.internal.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:735) 
04-25 11:02:01.227: E/AndroidRuntime(888): at com.android.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:149) 
04-25 11:02:01.227: E/AndroidRuntime(888): at com.android.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:874) 
04-25 11:02:01.227: E/AndroidRuntime(888): at com.android.internal.view.menu.ListMenuPresenter.onItemClick(ListMenuPresenter.java:166) 
04-25 11:02:01.227: E/AndroidRuntime(888): at android.widget.AdapterView.performItemClick(AdapterView.java:298) 
04-25 11:02:01.227: E/AndroidRuntime(888): at android.widget.AbsListView.performItemClick(AbsListView.java:1100) 
04-25 11:02:01.227: E/AndroidRuntime(888): at android.widget.AbsListView$PerformClick.run(AbsListView.java:2749) 
04-25 11:02:01.227: E/AndroidRuntime(888): at android.widget.AbsListView$1.run(AbsListView.java:3423) 
04-25 11:02:01.227: E/AndroidRuntime(888): at android.os.Handler.handleCallback(Handler.java:725) 
04-25 11:02:01.227: E/AndroidRuntime(888): at android.os.Handler.dispatchMessage(Handler.java:92) 
04-25 11:02:01.227: E/AndroidRuntime(888): at android.os.Looper.loop(Looper.java:137) 
04-25 11:02:01.227: E/AndroidRuntime(888): at android.app.ActivityThread.main(ActivityThread.java:5039) 
04-25 11:02:01.227: E/AndroidRuntime(888): at java.lang.reflect.Method.invokeNative(Native Method) 
04-25 11:02:01.227: E/AndroidRuntime(888): at java.lang.reflect.Method.invoke(Method.java:511) 
04-25 11:02:01.227: E/AndroidRuntime(888): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 
04-25 11:02:01.227: E/AndroidRuntime(888): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 
04-25 11:02:01.227: E/AndroidRuntime(888): at dalvik.system.NativeStart.main(Native Method) 

首選項enter code here .XML

<?xml version="1.0" encoding="utf-8"?> 
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" > 
    <EditTextPreference 
    android:title="EditText" 
    android:key="name" 
    android:summary="Enter Your Name" 
    ></EditTextPreference> 
    <CheckBoxPreference 
     android:title="CheckkBox" 
     android:defaultValue="true" 
     android:key="checkbox" 
     android:summary="Check This box"> 

    </CheckBoxPreference> 
    <ListPreference `enter code here` 
     android:title="list" 
     android:key="list" 
     android:summary="This is a list to choose from" 
     android:entries="@array/list" 
     android:entryValues="@array/lValues"> 
     </ListPreference> 

</PreferenceScreen> 

prefs.java

package com.thenewboston.travis; 

import android.os.Bundle; 
import android.preference.PreferenceActivity; 

public class prefs extends PreferenceActivity{ 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     // TODO Auto-generated method stub 
     super.onCreate(savedInstanceState); 
     addPreferencesFromResource(R.xml.prefs); 
    } 


} 

menu.java

package com.thenewboston.travis; 

import android.app.ListActivity; 
import android.content.Intent; 
import android.os.Bundle; 
import android.view.MenuInflater; 
import android.view.MenuItem; 
import android.view.View; 
import android.widget.ArrayAdapter; 
import android.widget.ListView; 

public class Menu extends ListActivity{ 

    String classes[] = {"StartingPoint","TextPlay","Email","Camera", 
         "Data","example5","example6","example7"}; 


    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     // TODO Auto-generated method stub 
     super.onCreate(savedInstanceState); 
     setListAdapter(new ArrayAdapter<String>(Menu.this, android.R.layout.simple_list_item_1, classes)); 

    } 

    @Override 
    protected void onListItemClick(ListView l, View v, int position, long id) { 
     // TODO Auto-generated method stub 

     super.onListItemClick(l, v, position, id); 
     String cheese = classes[position]; 
     try { 
      Class ourClass = Class.forName("com.thenewboston.travis."+cheese); 
      Intent ourIntent = new Intent(Menu.this,ourClass); 
      startActivity(ourIntent); 
     } catch (ClassNotFoundException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 


    } 

    @Override 
    public boolean onCreateOptionsMenu(android.view.Menu menu) { 
     // TODO Auto-generated method stub 
     super.onCreateOptionsMenu(menu); 
     MenuInflater blowUp = getMenuInflater(); 
     blowUp.inflate(R.menu.cool_menu, menu); 
     return true; 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     // TODO Auto-generated method stub 
      switch(item.getItemId()){ 

      case R.id.aboutMe: 
       Intent i = new Intent("com.thenewboston.travis.About"); 
       startActivity(i); 

       break; 
      case R.id.preferences : 
       Intent i1 = new Intent("com.thenewboston.travis.prefs"); 
       startActivity(i1); 
       break; 
      case R.id.exit: 
       finish(); 
       break; 
      } 
     return false; 
    } 




} 

的AndroidManifest.xml

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

    <uses-sdk 
    android:minSdkVersion="10" 
    android:targetSdkVersion="17" /> 
    <uses-permission android:name="android.permission.SET_WALLPAPER"/> 

    <application 
    android:allowBackup="true" 
    android:icon="@drawable/ic_launcher" 
    android:label="KCRaju" 
    android:theme="@style/AppTheme"> 
    <activity 
     android:name="com.thenewboston.travis.Splash" 
     android:label="KCRaju" 
     android:screenOrientation="portrait" > 
     <intent-filter> 
     <action android:name="android.intent.action.MAIN" /> 
     <category android:name="android.intent.category.LAUNCHER" /> 
     </intent-filter> 
    </activity> 
    <activity 
     android:name=".StartingPoint" 
     android:label="KCRaju" > 
     <intent-filter> 
     <action android:name="com.thenewboston.travis.STARTINGPOINT" /> 
     <category android:name="android.intent.category.DEFAULT" /> 
     </intent-filter> 
    </activity> 
    <activity 
     android:name=".Menu" 
     android:label="KCRaju" > 
     <intent-filter> 
     <action android:name="com.thenewboston.travis.MENU" /> 
     <category android:name="android.intent.category.DEFAULT" /> 
     </intent-filter> 
    </activity> 
    <activity 
     android:name=".prefs" 
     android:label="KCRaju" > 
     <intent-filter> 
     <action android:name="com.thenewboston.travis.PREFS" /> 
     <category android:name="android.intent.category.DEFAULT" /> 
     </intent-filter> 
    </activity> 
    <activity 
     android:name=".About" 
     android:label="KCRaju" 
     android:theme="@android:style/Theme.Dialog" > 
     <intent-filter> 
     <action android:name="com.thenewboston.travis.About" /> 
     <category android:name="android.intent.category.DEFAULT" /> 

     </intent-filter> 
    </activity> 
     <activity android:name=".TextPlay" android:label="@string/app_name" > 
    </activity> 
     <activity android:name=".Email" android:label="@string/app_name" > 
    </activity> 
     <activity android:name=".Camera" android:label="@string/app_name" android:screenOrientation="portrait" > 
    </activity> 
    <activity android:name=".Data" android:label="@string/app_name" android:screenOrientation="portrait" > 
    </activity> 
    <activity android:name=".OpenedClass" android:label="@string/app_name" android:screenOrientation="portrait" > 
    </activity> 
    </application> 

</manifest> 

Answer 1

你不配套，你使用啓動您的活動中的操作字符串的情況下：

Intent i1 = new Intent("com.thenewboston.travis.prefs"); 
startActivity(i1); 

相比，你的清單述說：

<activity 
    android:name=".prefs" 
    android:label="KCRaju" > 
    <intent-filter> 
    <action android:name="com.thenewboston.travis.PREFS" /> 
    <category android:name="android.intent.category.DEFAULT" /> 
    </intent-filter> 
</activity> 

因此，您正在創建動作"com.thenewboston.travis.prefs"的意圖，但您的IntentFilter將匹配"com.thenewboston.travis.PREFS"。

或者，嘗試刪除<intent-filter>從prefs申報的清單，並改變你啓動它的方式：

@Override 
public boolean onOptionsItemSelected(MenuItem item) { 
    // TODO Auto-generated method stub 
     switch(item.getItemId()){ 

     case R.id.aboutMe: 
      Intent i = new Intent(this, About.class); 
      startActivity(i); 

      break; 
     case R.id.preferences : 
      Intent i1 = new Intent(this, prefs.class); 
      startActivity(i1); 
      break; 
     case R.id.exit: 
      finish(); 
      break; 
     } 
    return false; 

Answer 2

在你的清單，你在聲明活動行動：

<activity 
     android:name=".prefs" 
     android:label="KCRaju" > 
     <intent-filter> 
     <action android:name="com.thenewboston.travis.PREFS" /> 
     <category android:name="android.intent.category.DEFAULT" /> 
     </intent-filter> 
    </activity> 

請注意大寫字母PREFS ..並且在您的代碼中您使用的是小型案例prefs：

case R.id.preferences : 
       Intent i1 = new Intent("com.thenewboston.travis.prefs"); 
       startActivity(i1); 
       break; 

大寫字母與PREFS嘗試像下面的代碼：

case R.id.preferences : 
       Intent i1 = new Intent("com.thenewboston.travis.PREFS"); 
       startActivity(i1); 
       break;