來自片段崩潰的Android調用活動應用程序

我想從一個片段調用我的活動並在開始時崩潰。來自片段崩潰的Android調用活動應用程序

這裏是我的片段代碼調用活動（擴展SherlockFragment）：

public class SalesOrder extends SherlockFragment{ 

    ListView myInfoList; 
    String[] items = {"Item 1", "Item 2"}; 
    ArrayAdapter<CharSequence> adapter; 

    ArrayList<MessageDetails> details; 
    AdapterView.AdapterContextMenuInfo info; 

    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){ 

     View view = inflater.inflate(R.layout.sales_order, container, false); 

     return view; 
    } 

    @Override 
    public void onActivityCreated(Bundle savedInstanceState) { 
     // TODO Auto-generated method stub 
     super.onActivityCreated(savedInstanceState); 
     refreshListView(); 
    } 

    private void refreshListView() 
    { 
     myInfoList = (ListView)getActivity().findViewById(R.id.MessageList); 
     adapter = new ArrayAdapter<CharSequence>(getActivity().getApplicationContext(), android.R.layout.simple_list_item_1, items); 
     myInfoList.setAdapter(adapter); 

     details = new ArrayList<MessageDetails>(); 
     MessageDetails Detail; 

     //CHANGE THIS PART TO RETRIEVE DATABASE ITEM DYNAMICALLY 
     List<String> itemName = new ArrayList<String>(); 
     itemName.add("Shirt Design 1"); 
     itemName.add("Shirt Design 2"); 
     itemName.add("Shirt Design 3"); 

     List<Float> itemPrice = new ArrayList<Float>(); 
     itemPrice.add(14f); 
     itemPrice.add(15f); 
     itemPrice.add(16f); 

     List<String> description = new ArrayList<String>(); 
     description.add("This is a fine shirt 1"); 
     description.add("This is a fine shirt 2"); 
     description.add("This is a fine shirt 3"); 

     Detail = new MessageDetails(); 

     for (int i =0; i < itemName.size(); i++) 
     { 
      Detail = new MessageDetails(); 
      Detail.setSub(itemName.get(i)); 
      Detail.setSubValue(itemPrice.get(i)); 
      Detail.setDescription(description.get(i)); 
      details.add(Detail); 
     } 

     myInfoList.setAdapter(new CustomAdapter(details , getActivity().getApplicationContext())); 

     myInfoList.setOnItemClickListener(new OnItemClickListener() { 
       public void onItemClick(AdapterView<?> a, View v, int position, long id) { 
        //System.out.println("Name: "+details.get(position).getSub(); 
        //String s = details.get(position).getDescription(); 

        Intent i = new Intent(getActivity(), purchase.class); 
        getActivity().startActivity(i); 
       } 
     }); 
    } 

    public class CustomAdapter extends BaseAdapter { 

     private ArrayList<MessageDetails> _data; 
     Context _c; 

     CustomAdapter (ArrayList<MessageDetails> data, Context c){ 
      _data = data; 
      _c = c; 
     } 

     public int getCount() { 
      // TODO Auto-generated method stub 
      return _data.size(); 
     } 

     public Object getItem(int position) { 
      // TODO Auto-generated method stub 
      return _data.get(position); 
     } 

     public long getItemId(int position) { 
      // TODO Auto-generated method stub 
      return position; 
     } 

     public View getView(final int position, View convertView, ViewGroup parent) { 
      // TODO Auto-generated method stub 
      View v = convertView; 
      if (v == null) 
      { 
       LayoutInflater vi = (LayoutInflater)_c.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
       v = vi.inflate(R.layout.mysaleslistview, null); 
      } 
       TextView subView = (TextView)v.findViewById(R.id.itemName); 
       TextView subValueView = (TextView)v.findViewById(R.id.itemPrice); 

       MessageDetails msg = _data.get(position); 
       subView.setText(msg.sub);  
       subValueView.setText(msg.subValue.toString());    

      return v; 
    } 
    } 

    public class MessageDetails { 
     String sub, description; 
     Float subValue; 

     public String getSub() { 
      return sub; 
     } 

     public void setSub(String sub) { 
      this.sub = sub; 
     } 

     public Float getSubValue() { 
      return subValue; 
     } 

     public void setSubValue(Float subValue) { 
      this.subValue = subValue; 
     } 

     public String getDescription() { 
      return description; 
     } 

     public void setDescription(String description) { 
      this.description = description; 
     } 
    } 
}

而我的活動，被稱爲（擴展活動）：

public class purchase extends Activity { 

    Button Btnpurchase; 


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

     requestWindowFeature(Window.FEATURE_NO_TITLE); 
     setContentView(R.layout.purchase); 
     Btnpurchase = (Button) findViewById(R.id.btnPurchase); 
    } 

}

而且我的logcat：

07-04 23:35:46.318: E/AndroidRuntime(7924): FATAL EXCEPTION: main 
07-04 23:35:46.318: E/AndroidRuntime(7924): java.lang.NullPointerException 
07-04 23:35:46.318: E/AndroidRuntime(7924):  at android.support.v4.app.FragmentManagerImpl.saveFragmentBasicState(FragmentManager.java:1576) 
07-04 23:35:46.318: E/AndroidRuntime(7924):  at android.support.v4.app.FragmentManagerImpl.saveAllState(FragmentManager.java:1617) 
07-04 23:35:46.318: E/AndroidRuntime(7924):  at android.support.v4.app.FragmentActivity.onSaveInstanceState(FragmentActivity.java:481) 
07-04 23:35:46.318: E/AndroidRuntime(7924):  at com.actionbarsherlock.app.SherlockFragmentActivity.onSaveInstanceState(SherlockFragmentActivity.java:127) 
07-04 23:35:46.318: E/AndroidRuntime(7924):  at android.app.Activity.performSaveInstanceState(Activity.java:1155) 
07-04 23:35:46.318: E/AndroidRuntime(7924):  at android.app.Instrumentation.callActivityOnSaveInstanceState(Instrumentation.java:1216) 
07-04 23:35:46.318: E/AndroidRuntime(7924):  at android.app.ActivityThread.performStopActivityInner(ActivityThread.java:3258) 
07-04 23:35:46.318: E/AndroidRuntime(7924):  at android.app.ActivityThread.handleStopActivity(ActivityThread.java:3318) 
07-04 23:35:46.318: E/AndroidRuntime(7924):  at android.app.ActivityThread.access$900(ActivityThread.java:156) 
07-04 23:35:46.318: E/AndroidRuntime(7924):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1277) 
07-04 23:35:46.318: E/AndroidRuntime(7924):  at android.os.Handler.dispatchMessage(Handler.java:99) 
07-04 23:35:46.318: E/AndroidRuntime(7924):  at android.os.Looper.loop(Looper.java:137) 
07-04 23:35:46.318: E/AndroidRuntime(7924):  at android.app.ActivityThread.main(ActivityThread.java:5233) 
07-04 23:35:46.318: E/AndroidRuntime(7924):  at java.lang.reflect.Method.invokeNative(Native Method) 
07-04 23:35:46.318: E/AndroidRuntime(7924):  at java.lang.reflect.Method.invoke(Method.java:511) 
07-04 23:35:46.318: E/AndroidRuntime(7924):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:799) 
07-04 23:35:46.318: E/AndroidRuntime(7924):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:566) 
07-04 23:35:46.318: E/AndroidRuntime(7924):  at dalvik.system.NativeStart.main(Native Method)

來源

2013-07-04 Bloopie Bloops

調用'意圖I =新意圖（getActivity（），purchaseDialog.class）;'就足夠了，而不'getApplicationContext（）'。你確定'purchaseDialog'是活動嗎？奇怪的名字... – azizbekian

你能告訴我們你在哪裏調用'saveFragmentBasicState'？這是造成問題 –

我不確定它是哪個，但我會添加整個片段代碼 –

將您的意圖改爲：

Intent i = new Intent(getActivity(), purchaseDialog.class);

P.S.

命名活動類purchaseDialog不是好的做法imho。

來源

2013-07-04 15:31:12 azizbekian

嘗試過，同樣的錯誤沒有改變 –

起初我想嘗試使它成爲一個對話框，但我改變了主意：X –

反正，更新線程，仍然沒有運氣 –

嘗試以下

Intent i = new Intent(getActivity(), purchaseDialog.class); 
startActivity(i);

一個建議試試這個

myInfoList = (ListView)view.findViewById(R.id.MessageList);

來源

2013-07-04 15:31:57 Raghunandan

同樣的錯誤再次D：這是讓我瘋狂 –

@BloopieBloops我只是試了一下它的工作原理me – Raghunandan

@BloopieBloops確定你在清單文件中有'purchaseDialog'條目。我沒有看到你的代碼有什麼問題。 – Raghunandan

你不提什麼活動被稱爲中，你有片段。我現在只稱其爲MyActivity。

嘗試：

Intent i = new Intent(MyActivity.this, purchase.class); 
MyActivity.this.startActivity(i);

來源

2013-07-04 15:50:47

來自片段崩潰的Android調用活動應用程序

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