未找到活動處理意圖異常

Question

我遇到問題。當我嘗試調用一個新的Activity，在這種情況下com.joaocarreira.familylocator.prefs，應用程序崩潰與：

android.content.ActivityNotFoundException: No Activity found to handle Intent { act=com.joaocarreira.familylocator.Prefs } 

我已經在網絡上搜索，並且一切似乎與我AndroidManifest文件有關。

AndroidManifest

<activity 
     android:name="com.joaocarreira.familylocator.Prefs" 
     android:label="@string/app_name" > 
     <intent-filter> 
      <action android:name="android.intent.action.PREFS" /> 

      <category android:name="android.intent.category.DEFAULT" /> 
     </intent-filter> 
    </activity> 

活動呼叫

case R.id.action_settings: 
      Intent prefs = new Intent("com.joaocarreira.familylocator.Prefs"); 
      startActivity(prefs); 
      break; 

偏好設置類

public class Prefs extends PreferenceActivity{ 

@Override 
protected void onCreate(Bundle savedInstanceState){ 
    super.onCreate(savedInstanceState); 
    setContentView(R.xml.prefs); 
} 
} 

logcat的

06-11 17:43:47.422 1097-1097/com.joaocarreira.familylocator E/AndroidRuntime﹕ FATAL EXCEPTION: main 
Process: com.joaocarreira.familylocator, PID: 1097 
android.content.ActivityNotFoundException: No Activity found to handle Intent { act=com.joaocarreira.familylocator.Prefs } 
     at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1632) 
     at android.app.Instrumentation.execStartActivity(Instrumentation.java:1424) 
     at android.app.Activity.startActivityForResult(Activity.java:3424) 
     at android.app.Activity.startActivityForResult(Activity.java:3385) 
     at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:839) 
     at android.app.Activity.startActivity(Activity.java:3627) 
     at android.app.Activity.startActivity(Activity.java:3595) 
     at com.joaocarreira.familylocator.MainActivity.onOptionsItemSelected(MainActivity.java:164) 
     at android.app.Activity.onMenuItemSelected(Activity.java:2600) 
     at android.support.v4.app.FragmentActivity.onMenuItemSelected(FragmentActivity.java:372) 
     at android.support.v7.app.ActionBarActivity.superOnMenuItemSelected(ActionBarActivity.java:244) 
     at android.support.v7.app.ActionBarActivityDelegateICS.onMenuItemSelected(ActionBarActivityDelegateICS.java:164) 
     at android.support.v7.app.ActionBarActivity.onMenuItemSelected(ActionBarActivity.java:130) 
     at android.support.v7.app.ActionBarActivityDelegateICS$WindowCallbackWrapper.onMenuItemSelected(ActionBarActivityDelegateICS.java:308) 
     at com.android.internal.policy.impl.PhoneWindow.onMenuItemSelected(PhoneWindow.java:1012) 
     at com.android.internal.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:735) 
     at com.android.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:152) 
     at com.android.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:874) 
     at com.android.internal.view.menu.ListMenuPresenter.onItemClick(ListMenuPresenter.java:166) 
     at android.widget.AdapterView.performItemClick(AdapterView.java:299) 
     at android.widget.AbsListView.performItemClick(AbsListView.java:1113) 
     at android.widget.AbsListView$PerformClick.run(AbsListView.java:2904) 
     at android.widget.AbsListView$3.run(AbsListView.java:3638) 
     at android.os.Handler.handleCallback(Handler.java:733) 
     at android.os.Handler.dispatchMessage(Handler.java:95) 
     at android.os.Looper.loop(Looper.java:136) 
     at android.app.ActivityThread.main(ActivityThread.java:5017) 
     at java.lang.reflect.Method.invokeNative(Native Method) 
     at java.lang.reflect.Method.invoke(Method.java:515) 
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779) 
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595) 
     at dalvik.system.NativeStart.main(Native Method) 

Answer 1

而不是

Intent prefs = new Intent("com.joaocarreira.familylocator.Prefs"); 

使用

Intent prefs = new Intent(CallingActivity.this, Prefs.class); 

，或者嘗試完全限定名：

Intent prefs = new Intent(CallingActivity.this, com.joaocarreira.familylocator.Prefs.class);