quelle différence ont ListActivity entre Activity?

Question

Je dois changer l'activité en ListActivity. Mais je ne peux pas commencer mon projet ... est-ce que je dois changer manifest.xml pour cela?

Ou comment puis-je changer l'écran de Activity à ListActivity? Y at-il une différence à startActivity(new Intent(this, list.class))?

10-05 17:34:54.722: ERROR/AndroidRuntime(11550): java.lang.RuntimeException: Unable to start activity ComponentInfo{spexco.hus.cepvizyon/spexco.hus.cepvizyon.CepVizyon}: java.lang.RuntimeException: Your content must have a ListView whose id attribute is 'android.R.id.list' 
10-05 17:34:54.722: ERROR/AndroidRuntime(11550):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2496) 
10-05 17:34:54.722: ERROR/AndroidRuntime(11550):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2512) 
10-05 17:34:54.722: ERROR/AndroidRuntime(11550):  at android.app.ActivityThread.access$2200(ActivityThread.java:119) 
10-05 17:34:54.722: ERROR/AndroidRuntime(11550):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863) 
10-05 17:34:54.722: ERROR/AndroidRuntime(11550):  at android.os.Handler.dispatchMessage(Handler.java:99) 
10-05 17:34:54.722: ERROR/AndroidRuntime(11550):  at android.os.Looper.loop(Looper.java:123) 
10-05 17:34:54.722: ERROR/AndroidRuntime(11550):  at android.app.ActivityThread.main(ActivityThread.java:4363) 
10-05 17:34:54.722: ERROR/AndroidRuntime(11550):  at java.lang.reflect.Method.invokeNative(Native Method) 
10-05 17:34:54.722: ERROR/AndroidRuntime(11550):  at java.lang.reflect.Method.invoke(Method.java:521) 
10-05 17:34:54.722: ERROR/AndroidRuntime(11550):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) 
10-05 17:34:54.722: ERROR/AndroidRuntime(11550):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 
10-05 17:34:54.722: ERROR/AndroidRuntime(11550):  at dalvik.system.NativeStart.main(Native Method) 
10-05 17:34:54.722: ERROR/AndroidRuntime(11550): Caused by: java.lang.RuntimeException: Your content must have a ListView whose id attribute is 'android.R.id.list' 
10-05 17:34:54.722: ERROR/AndroidRuntime(11550):  at android.app.ListActivity.onContentChanged(ListActivity.java:236) 
10-05 17:34:54.722: ERROR/AndroidRuntime(11550):  at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:201) 
10-05 17:34:54.722: ERROR/AndroidRuntime(11550):  at android.app.Activity.setContentView(Activity.java:1622) 
10-05 17:34:54.722: ERROR/AndroidRuntime(11550):  at spexco.hus.cepvizyon.CepVizyon.onCreate(CepVizyon.java:21) 
10-05 17:34:54.722: ERROR/AndroidRuntime(11550):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
10-05 17:34:54.722: ERROR/AndroidRuntime(11550):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2459) 
10-05 17:34:54.722: ERROR/AndroidRuntime(11550):  ... 11 more 
10-05 17:34:55.432: ERROR/PowerManagerService(129): setPowerState SystemProperties.get siBefornormal 
10-05 17:35:01.872: ERROR/PowerManagerService(129): setPowerState SystemProperties.get siBefornormal 




    public class CepVizyon extends ListActivity { 
    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 

     requestWindowFeature(Window.FEATURE_NO_TITLE); 
     getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, 
           WindowManager.LayoutParams.FLAG_FULLSCREEN); 
     setContentView(R.layout.main); 
     ListView list=(ListView) findViewById(R.id.list); 
     ImageButton b1 = (ImageButton) findViewById(R.id.menu_mycameras); 
     ImageButton b2 = (ImageButton) findViewById(R.id.menu_aboutus); 
     ImageButton b3 = (ImageButton) findViewById(R.id.menu_help); 

     b1.setOnClickListener(new OnClickListener() { 

      @Override 
      public void onClick(View v) { 
       Intent intent=new Intent(CepVizyon.this, CameraSelectScreen.class); 
       startActivity(intent); 

       // TODO Auto-generated method stub 

      } 
     }); 
     b2.setOnClickListener(new OnClickListener() { 

      @Override 
      public void onClick(View v) { 
       Intent intent=new Intent(CepVizyon.this,MainActivity.class); 
       startActivity(intent); 
       // TODO Auto-generated method stub 

      } 
     }); 
     b3.setOnClickListener(new OnClickListener() { 

      @Override 
      public void onClick(View v) { 
       // TODO Auto-generated method stub 


      } 
     }); 
    } 
} 

c'est ma classe ..

Et voici ma main.xml Je n'utiliser la liste là-bas, je l'ai mis pour la pile d'erreurs. mais rien ne change.

<LinearLayout android:layout_width="fill_parent" android:layout_height="fill_parent" 
android:orientation="vertical" android:layout_weight="3"> 

<ImageButton android:layout_weight="1" android:id="@+id/menu_mycameras" 
    android:layout_width="fill_parent" android:layout_height="fill_parent" 
    android:background="@drawable/menu_cameras"> 
</ImageButton> 
<ListView android:id="@+id/list" android:layout_width="fill_parent" android:layout_height="wrap_content" ></ListView> 
<ImageButton 
    android:paddingTop="20px" 
    android:layout_weight="1" android:id="@+id/menu_aboutus" 
    android:layout_width="fill_parent" android:layout_height="fill_parent" 
    android:background="@drawable/menu_aboutus"> 
</ImageButton> 

<ImageButton android:layout_weight="1" android:id="@+id/menu_help" 
    android:layout_width="fill_parent" android:layout_height="fill_parent" 
    android:background="@drawable/menu_help"> 
</ImageButton> 

</LinearLayout> 

Answer 1

L'ID de votre ListView doit être: "@android: id/list". De cette façon, ListActivity le trouvera.

Answer 2

Essayez de lire les traces de pile. Il vous indique exactement ce dont vous avez besoin: "Votre contenu doit avoir un ListView dont l'attribut id est 'android.R.id.list'"