Android如果其他不工作在ListActivity

-1

好吧我有一个ListActivity在ListItem我在哪里检查它是否会工作与否。Android如果其他不工作在ListActivity

这是我的代码：

public class mainActivity extends ListActivity{ 

    Intent openActivityMainMenu; 
    tourDB getArivalDate; 
    long getlastID; 
    String getAD; 
    String Check; 
    public static boolean checkPro = false; 
    private static final String mainMenuList[] = {"Create New","Now Going Tour","My Trip History","Famous Tourist Attractions","Alarm Settings","About Us"}; 
    @Override 
    protected void onCreate(Bundle teamblackCatMainPage) { 

     super.onCreate(teamblackCatMainPage); 

     try{ 
      getArivalDate = new tourDB(mainActivity.this); 
     }catch(SQLException e){ 
      e.printStackTrace(); 
     } 

     getArivalDate.open(); 



     setListAdapter(new MenuArrayAdapter(this, mainMenuList)); 
    } 

    @Override 
    protected void onListItemClick(ListView l, View v, int position, long id) { 

     super.onListItemClick(l, v, position, id); 

     String positionItemMainMenu = (String) getListAdapter().getItem(position); 

     if (positionItemMainMenu.contentEquals("Create New")) { 

      //checkPro = createNewActivity_2.openPro; 

      //if (checkPro == false) { 

       openActivityMainMenu = new Intent("com.blackcat.blackcattourorganizer.CREATENEWACTIVITY_1"); 
       startActivity(openActivityMainMenu); 


      //}else { 

       //Toast.makeText(getApplicationContext(), "One Profile Is Running", Toast.LENGTH_LONG).show(); 
      //} 
     }else if (positionItemMainMenu.contentEquals("Now Going Tour")) { 

      getArivalDate.open(); 
      getlastID = getArivalDate.getMaxID(); 
      getAD = getArivalDate.getArivaldateforCheck(getlastID); 
      getArivalDate.close(); 
      Check = getAD; 

      if (getAD.contentEquals(Check) || getAD.contentEquals(null)){ 

       openActivityMainMenu = new Intent("com.blackcat.blackcattourorganizer.ONGOINGACTIVITY"); 
       startActivity(openActivityMainMenu);  

      }else{ 

       Toast.makeText(getApplicationContext(), "Create profile First", Toast.LENGTH_SHORT).show(); 

      } 

     }else if (positionItemMainMenu.contentEquals("My Trip History")) { 

      openActivityMainMenu = new Intent("com.blackcat.blackcattourorganizer.TOURLISTACTIVITY"); 
      startActivity(openActivityMainMenu); 

     }else if (positionItemMainMenu.contentEquals("Famous Tourist Attractions")) { 

      openActivityMainMenu = new Intent("com.blackcat.blackcattourorganizer.FAMOUSTOURACTIVITY"); 
      startActivity(openActivityMainMenu); 

     }else if (positionItemMainMenu.contentEquals("Alarm Settings")) { 

      openActivityMainMenu = new Intent("com.blackcat.blackcattourorganizer.ALARMSETACTIVITY"); 
      startActivity(openActivityMainMenu); 

     }else if (positionItemMainMenu.contentEquals("About Us")) { 

      openActivityMainMenu = new Intent("com.blackcat.blackcattourorganizer.ABOUTUSACTIVITY"); 
      startActivity(openActivityMainMenu); 
     } 
    } 
}

这是logcat的。我究竟做错了什么？

12-10 14:00:27.542: E/AndroidRuntime(2387): FATAL EXCEPTION: main 
12-10 14:00:27.542: E/AndroidRuntime(2387): java.lang.NullPointerException 
12-10 14:00:27.542: E/AndroidRuntime(2387):  at java.lang.String.contentEquals(String.java:1701) 
12-10 14:00:27.542: E/AndroidRuntime(2387):  at com.blackcat.blackcattourorganizer.mainActivity.onListItemClick(mainActivity.java:74) 
12-10 14:00:27.542: E/AndroidRuntime(2387):  at android.app.ListActivity$2.onItemClick(ListActivity.java:319) 
12-10 14:00:27.542: E/AndroidRuntime(2387):  at android.widget.AdapterView.performItemClick(AdapterView.java:298) 
12-10 14:00:27.542: E/AndroidRuntime(2387):  at android.widget.AbsListView.performItemClick(AbsListView.java:1100) 
12-10 14:00:27.542: E/AndroidRuntime(2387):  at android.widget.AbsListView$PerformClick.run(AbsListView.java:2749) 
12-10 14:00:27.542: E/AndroidRuntime(2387):  at android.widget.AbsListView$1.run(AbsListView.java:3423) 
12-10 14:00:27.542: E/AndroidRuntime(2387):  at android.os.Handler.handleCallback(Handler.java:725) 
12-10 14:00:27.542: E/AndroidRuntime(2387):  at android.os.Handler.dispatchMessage(Handler.java:92) 
12-10 14:00:27.542: E/AndroidRuntime(2387):  at android.os.Looper.loop(Looper.java:137) 
12-10 14:00:27.542: E/AndroidRuntime(2387):  at android.app.ActivityThread.main(ActivityThread.java:5039) 
12-10 14:00:27.542: E/AndroidRuntime(2387):  at java.lang.reflect.Method.invokeNative(Native Method) 
12-10 14:00:27.542: E/AndroidRuntime(2387):  at java.lang.reflect.Method.invoke(Method.java:511) 
12-10 14:00:27.542: E/AndroidRuntime(2387):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 
12-10 14:00:27.542: E/AndroidRuntime(2387):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 
12-10 14:00:27.542: E/AndroidRuntime(2387):  at dalvik.system.NativeStart.main(Native Method)

来源

2013-12-10 mhtamun

哪条线是74线？ – thegrinner

看起来像'positionItemMainMenu'为null，您正在尝试使用它。调试，看看为什么它是空的。 –

没有更多的代码我猜你MenuArrayAdapter不正确执行getItem方法。

检查您的适配器如何处理getItem(int position)请求以及为什么您将空作为答案。

来源

2013-12-10 21:21:19 Mike

positionItemMainMenu显然为空。

可能MenuArrayAdapter没有设置属性项数组mainMenuList。或者你可以重写getItem方法。

来源

2013-12-10 21:22:03

Android如果其他不工作在ListActivity

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