получение исключения null Указатель исключить не удалось начать основную деятельность

Question

StockLedgerRpt Класс, отображающий исключение исключающего указателя. Этот класс отображает список в представлении spinner для выбора элемента запаса.

package com.manacle.umma.activity; 

import java.text.DateFormat; 
import java.text.SimpleDateFormat; 
import java.util.Calendar; 
import java.util.Date; 
import java.util.HashMap; 
import java.util.Iterator; 
import java.util.List; 
import java.util.Map; 

import android.app.DatePickerDialog; 
import android.app.DatePickerDialog.OnDateSetListener; 
import android.app.ListActivity; 
import android.content.Context; 
import android.content.Intent; 
import android.content.SharedPreferences; 
import android.os.Bundle; 
import android.speech.tts.TextToSpeech; 
import android.view.MotionEvent; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.AdapterView; 
import android.widget.AdapterView.OnItemClickListener; 
import android.widget.AdapterView.OnItemSelectedListener; 
import android.widget.Button; 
import android.widget.DatePicker; 
import android.widget.EditText; 
import android.widget.LinearLayout; 
import android.widget.ListAdapter; 
import android.widget.ListView; 
import android.widget.RelativeLayout; 
import android.widget.SimpleAdapter; 
import android.widget.Spinner; 
import android.widget.TextView; 
import android.widget.Toast; 

import com.manacle.umma.java.Constants; 
import com.manacle.umma.java.DatabaseHelper; 
import com.manacle.umma.java.Header; 
import com.manacle.umma.java.Validation; 

public class StockLedgerRep extends ListActivity { 

    Button srch_btn; 
    TextView stckldgr_header, stckldgr_cntr, frm_date, to_date, 
    stck_item; 
    EditText to_dt_edit, frm_dt_edit; 
    Spinner add_stcitm_spin; 
    RelativeLayout stckldgr_relative; 
    LinearLayout stckldgr_linearLayout; 
    HeaderDb headerDb; 
    ListAdapter adapter; 
    Header headerClass; 
    HashMap<String, String> map, categoryMap, unitMap; 
    String value, stockId, voucherId, code; 
    String stockItemsname[] = null; 
    String batchId = null; 
    DatabaseHelper databaseHelper; 
    Map stockItemMap; 

    SharedPreferences preferences; 
    String itemname; 
    String firstSelection; 
    private TextToSpeech tts; 

    String batchIDD; 

    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.stck_ldgr_rpt); 

     final HeaderDb db = new HeaderDb(getApplicationContext()); 

     headerDb = new HeaderDb(getApplicationContext()); 

     stckldgr_relative = (RelativeLayout) findViewById(R.id.stckldgr_relative_layout); 
     stckldgr_linearLayout = (LinearLayout) findViewById(R.id.stckldgr_linear_layout); 
     stckldgr_header = (TextView) findViewById(R.id.stckldgr_header); 
     stckldgr_cntr = (TextView) findViewById(R.id.stckldgr_txt); 
     frm_date = (TextView) findViewById(R.id.stckldgr_frmdate_txt); 
     to_date= (TextView) findViewById(R.id.stckldgr_todate_txt); 
     stck_item=(TextView) findViewById(R.id.stckldgr_stockItem_txt); 
     add_stcitm_spin=(Spinner) findViewById(R.id.stckldgr_stock_item_spinner); 

     frm_dt_edit = (EditText) findViewById(R.id.stckldgr_frmdate_edit); 
     to_dt_edit = (EditText) findViewById(R.id.stckldgr_todate_edit); 
     DateFormat dateFormat = new SimpleDateFormat("MM/dd/yyyy"); 
     Date date = new Date(); 
     frm_dt_edit.setText(dateFormat.format(date)); 
     frm_dt_edit.setFocusable(false); 
     to_dt_edit.setText(dateFormat.format(date)); 
     to_dt_edit.setFocusable(false); 


     String dat = preferences.getString("STOCK_CODE", ""); 
     if (!dat.equalsIgnoreCase("")) { 
      // Toast.makeText(getApplicationContext(), "Selected date="+dat, 
      // Toast.LENGTH_LONG).show(); 
      stckldgr_cntr.setText(dat); 

     } 

     final OnDateSetListener odsl = new OnDateSetListener() { 

      @Override 
      public void onDateSet(DatePicker arg0, int year, int month, int day) { 
       String date_format = Validation.dateFormat(month, day, year); 

       frm_dt_edit.setText(date_format); 
       to_dt_edit.setText(date_format); 
       } 
     }; 

     frm_dt_edit.setOnClickListener(new OnClickListener() { 

      @Override 
      public void onClick(View v) { 

       Calendar cal = Calendar.getInstance(); 
       DatePickerDialog datePickDiag = new DatePickerDialog(
         StockLedgerRep.this, odsl, cal.get(Calendar.YEAR), cal 
         .get(Calendar.MONTH), cal 
         .get(Calendar.DAY_OF_MONTH)); 
       datePickDiag.show(); 

      } 
     }); 

     to_dt_edit.setOnClickListener(new OnClickListener() { 

      @Override 
      public void onClick(View v) { 

       Calendar cal = Calendar.getInstance(); 
       DatePickerDialog datePickDiag = new DatePickerDialog(
         StockLedgerRep.this, odsl, cal.get(Calendar.YEAR), cal 
         .get(Calendar.MONTH), cal 
         .get(Calendar.DAY_OF_MONTH)); 
       datePickDiag.show(); 

      } 
     }); 


     com.manacle.umma.java.SpinnerAdapter adapter1 = new com.manacle.umma.java.SpinnerAdapter(
       this, android.R.layout.simple_spinner_item, getStockItem()); 

     add_stcitm_spin.setAdapter(adapter1); 

     add_stcitm_spin.setOnItemSelectedListener(new OnItemSelectedListener() { 

      @Override 
      public void onItemSelected(AdapterView<?> arg0, View arg1, 
        int arg2, long arg3) { 
       // TODO Auto-generated method stub 

       Object item = arg0.getItemAtPosition(arg2); 

       if (item.equals("")) { 

       } else { 
        firstSelection = add_stcitm_spin.getSelectedItem() 
          .toString(); 
        // tToast(""+firstSelection); 

        if (firstSelection.equals("All")) { 
         if (headerDb.getVouDateTransIdfromVouTableforAllItem(value, batchId).size() > 0) { 
          //showAllName_Id(); 
         } else { 
          // tToast("No Record, Please add new Record."); 
          //showAllName_Id(); 
         } 
        } else { 
         List stockItemList = headerDb 
           .getAllIRMStockItem(headerDb 
             .getAllIRMStockcategoryID()); 
         Map mapItem = (Map) stockItemList.get(arg2 - 1); 
         code = (String) mapItem.get(add_stcitm_spin 
           .getSelectedItem().toString()); 
        } 
       } 

      } 

      @Override 
      public void onNothingSelected(AdapterView<?> arg0) { 
       // TODO Auto-generated method stub 

      } 
     }); } 








    private void tToast(String s) { 
     Context context = getApplicationContext(); 
     int duration = Toast.LENGTH_SHORT; 
     Toast toast = Toast.makeText(context, s, duration); 
     toast.show(); 
    } 



    public String[] getStockItem() { 

     String arr_name[] = null; 
     List listCategoryId = headerDb.getAllIRMStockcategoryID(); 
     List stockList = headerDb.getAllIRMStockItem(listCategoryId); 

     Iterator memberItemsItr = headerDb.getAllIRMStockItem(listCategoryId) 
       .iterator(); 
     int i = 0; 
     arr_name = new String[stockList.size() + 1]; 
     arr_name[0] = "All"; 
     i++; 
     // tToast("ARRSIZE="+listCategoryId.size()); 
     while (memberItemsItr.hasNext()) { 

      stockItemMap = (Map) memberItemsItr.next(); 

      Iterator<?> iter = stockItemMap.entrySet().iterator(); 

      // String arr_code[]=new String[memberItemsMap.size()+1]; 
      while (iter.hasNext()) { 
       Map.Entry mEntry = (Map.Entry) iter.next(); 
       // tToast(mEntry.getKey() + " : " + mEntry.getValue()); 
       String stockName = (String) mEntry.getKey(); 
       String stockCode = (String) mEntry.getValue(); 

       arr_name[i] = stockName; 
       i++; 

      } 

     } 
     return arr_name; 
    } 
    public void showAllName_Id() { 

     adapter = new SimpleAdapter(this, headerDb.getVouDateTransIdfromVouTableforAllItem(value, batchId), 
       R.layout.stock_list_item, new String[] { 
         Constants.Bat_Acc_Voch_VOUCHER_DATE, 
         Constants.Bat_Acc_Voch_Trans_Id }, new int[] { 
         R.id.stock_list_code, R.id.stock_list_name }); 

     setListAdapter(adapter); 

     // selecting single ListView item 
     ListView lv = getListView(); 
     // lv.setBackgroundColor(Integer.parseInt(headerDb.getBgColor("KD125"), 
     // 16)+0xFF000000); 
     // lv.setChoiceMode(AbsListView.CHOICE_MODE_SINGLE); 
     try { 
      // lv.setSelector(R.drawable.sel); 
     } catch (Exception e) { 
      // TODO: handle exception 
      tToast("Error" + e); 
     } 
     // lv.setSelector(Color.RED); 
    lv.setOnTouchListener(new ListView.OnTouchListener() { 
      @Override 
      public boolean onTouch(View v, MotionEvent event) { 
       int action = event.getAction(); 
       switch (action) { 
       case MotionEvent.ACTION_DOWN: 
        // Disallow ScrollView to intercept touch events. 
        v.getParent().requestDisallowInterceptTouchEvent(true); 

        // v.setBackgroundResource(R.drawable.sel); 

        break; 

       case MotionEvent.ACTION_UP: 
        // Allow ScrollView to intercept touch events. 
        v.getParent().requestDisallowInterceptTouchEvent(false); 
        // v.setBackgroundResource(R.drawable.sel); 

        break; 
       } 

       // Handle ListView touch events. 
       v.onTouchEvent(event); 
       return true; 
      } 
     }); 

    lv.setOnItemClickListener(new OnItemClickListener() { 

      @Override 
      public void onItemClick(AdapterView<?> parent, View view, 
        int position, long id) { 
       String name = ((TextView) view 
         .findViewById(R.id.stock_list_code)).getText() 
         .toString(); 

       voucherId = ((TextView) view.findViewById(R.id.stock_list_name)) 
         .getText().toString(); 
       String Vid[] = voucherId.split("-"); 
       String vid = Vid[1]; 
       String mobtrans = Vid[0]; 
       // tToast("Voucher Id="+vid); 
       // tToast("Selected Value="+name+""+code); 

       Intent in = new Intent(getApplicationContext(), 
         IRM_add_preview.class); 
       in.putExtra("VOU_ID", vid); 
       in.putExtra("VALUE", value); 
       in.putExtra("MOBTRANS", mobtrans); 
       startActivity(in); 

      } 
     }); 
    } 
    } 

stck_ldgr Xml Этот XML показывает три вещи, один является вертушка фондовых элементы колонки и другие два укажите дату. Я не могу получить ошибку. PLS помощи. даже добавил в AndroidManifest.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 

    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:focusableInTouchMode="true" 
     android:id="@+id/stckldgr_relative_layout" 

    > 

    <TextView 
     android:id="@+id/imageView1" 
     android:layout_width="match_parent" 
     android:layout_height="10dp" 
     /> 

    <TextView 
     android:id="@+id/imageView2" 
     android:layout_width="match_parent" 
     android:layout_height="1dp" 
     android:layout_alignParentBottom="true" 
     android:layout_alignParentLeft="true" 
     /> 

    <LinearLayout 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_above="@+id/imageView2" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentRight="true" 
     android:layout_below="@+id/imageView1" 
     android:orientation="vertical" 
     android:id="@+id/stckldgr_linear_layout" 

     > 

     <!-- --> 
     <ScrollView 
       android:id="@+id/scroller" 
       android:layout_width="fill_parent" 
       android:layout_height="fill_parent" 
       android:fillViewport="true" > 



    <LinearLayout 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:orientation="vertical" 

     > 
     <TextView 
      android:layout_width="fill_parent" 
      android:layout_height="wrap_content" 
      android:paddingLeft="6dip" 
      android:paddingRight="6dip" 
      android:paddingTop="6dip" 
      android:textAppearance="?android:attr/textAppearanceMedium" 
      android:text="Stock Ledger Report" 
      android:textStyle="bold" 
      android:gravity="center" 
     android:id="@+id/stckldgr_header" 
      /> 

     <View 
      android:layout_width="fill_parent" 
      android:layout_height="1dip" 
      android:background="#ff106510" 
      android:layout_marginLeft="6dip" 
      android:layout_marginRight="6dip" 
      android:layout_marginTop="6dip" 
      android:layout_marginBottom="12dip" /> 

     <LinearLayout 
     android:id="@+id/linearLayout_login_4" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:orientation="vertical" 

     > 

      <TableLayout 
       android:layout_width="match_parent" 
       android:layout_height="match_parent" > 


      <TextView 
      android:layout_width="fill_parent" 
      android:layout_height="wrap_content" 
      android:paddingLeft="6dip" 
      android:paddingRight="6dip" 
      android:id="@+id/stckldgr_txt" 
      android:textStyle="bold" 
      android:textAppearance="?android:attr/textAppearanceMedium" 
      android:text="Stock Center Code-Name" 
      android:gravity="center" 
      /> 


      <TableRow 
        android:id="@+id/tableRow1" 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        > 
        <TextView 

      android:text="Stock Item" 
      android:height="40dp" 
      android:width="150dp" 
      android:layout_marginTop="10dip" 
      android:textStyle="bold" 
        android:id="@+id/stckldgr_stockItem_txt" 

      android:layout_gravity="center_horizontal|bottom" 

      ></TextView> 

         <Spinner 
android:id="@+id/stckldgr_stock_item_spinner" 
android:layout_width="match_parent" 
android:layout_height="40dp" 
android:layout_marginRight="6dip" 

android:saveEnabled="true" > 

</Spinner> 



         </TableRow> 


      <TableRow 
        android:id="@+id/tableRow1" 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        android:layout_marginTop="5dip" 
        > 

         <TextView 
          android:layout_width="150dp" 
          android:layout_height="40dp" 
          android:layout_marginTop="10dip" 
          android:text="From Date" 
          android:textStyle="bold" 
          android:id="@+id/stckldgr_frmdate_txt" 

          /> 

         <EditText 
          android:id="@+id/stckldgr_frmdate_edit" 
          android:layout_width="match_parent" 
          android:layout_height="40dp" 
          android:layout_marginLeft="0dip" 
          android:layout_marginRight="10dip" 

          android:editable="false" 
          > 

          <requestFocus /> 
         </EditText> 

         </TableRow> 

      <TableRow 
        android:id="@+id/tableRow1" 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        android:layout_marginTop="5dip" 
        > 

         <TextView 
          android:layout_width="150dp" 
          android:layout_height="40dp" 
          android:layout_marginTop="10dip" 
          android:text="To Date" 
          android:textStyle="bold" 
          android:id="@+id/stckldgr_todate_txt" 

          /> 

         <EditText 
          android:id="@+id/stckldgr_todate_edit" 
          android:layout_width="match_parent" 
          android:layout_height="40dp" 
          android:layout_marginLeft="0dip" 
          android:layout_marginRight="10dip" 

          android:editable="false" 
          > 

          <requestFocus /> 
         </EditText> 

         </TableRow> 




      </TableLayout> 

       <ListView 
      android:id="@android:id/list" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:layout_marginBottom="15dp" 
      android:layout_marginTop="15dp" 
      android:layout_weight="1" 
      android:divider="@color/divider" 
       android:listSelector="#369659" 
       android:cacheColorHint="#369659" 
      android:dividerHeight="2px" 
      android:choiceMode="singleChoice" 
      android:gravity="center" > 
     </ListView> 

     </LinearLayout> 
    </LinearLayout> 
    </ScrollView> 
    </LinearLayout> 

    </RelativeLayout> 

Logcat

10-10 10:44:55.832: D/AndroidRuntime(2639): Shutting down VM 
10-10 10:44:55.865: W/dalvikvm(2639): threadid=1: thread exiting with uncaught exception (group=0x40a71930) 
10-10 10:44:56.023: E/AndroidRuntime(2639): FATAL EXCEPTION: main 
10-10 10:44:56.023: E/AndroidRuntime(2639): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.manacle.umma.activity/com.manacle.umma.activity.StockLedgerRep}: java.lang.NullPointerException 
10-10 10:44:56.023: E/AndroidRuntime(2639):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180) 
10-10 10:44:56.023: E/AndroidRuntime(2639):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 
10-10 10:44:56.023: E/AndroidRuntime(2639):  at android.app.ActivityThread.access$600(ActivityThread.java:141) 
10-10 10:44:56.023: E/AndroidRuntime(2639):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) 
10-10 10:44:56.023: E/AndroidRuntime(2639):  at android.os.Handler.dispatchMessage(Handler.java:99) 
10-10 10:44:56.023: E/AndroidRuntime(2639):  at android.os.Looper.loop(Looper.java:137) 
10-10 10:44:56.023: E/AndroidRuntime(2639):  at android.app.ActivityThread.main(ActivityThread.java:5041) 
10-10 10:44:56.023: E/AndroidRuntime(2639):  at java.lang.reflect.Method.invokeNative(Native Method) 
10-10 10:44:56.023: E/AndroidRuntime(2639):  at java.lang.reflect.Method.invoke(Method.java:511) 
10-10 10:44:56.023: E/AndroidRuntime(2639):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 
10-10 10:44:56.023: E/AndroidRuntime(2639):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 
10-10 10:44:56.023: E/AndroidRuntime(2639):  at dalvik.system.NativeStart.main(Native Method) 
10-10 10:44:56.023: E/AndroidRuntime(2639): Caused by: java.lang.NullPointerException 
10-10 10:44:56.023: E/AndroidRuntime(2639):  at com.manacle.umma.activity.StockLedgerRep.onCreate(StockLedgerRep.java:96) 
10-10 10:44:56.023: E/AndroidRuntime(2639):  at android.app.Activity.performCreate(Activity.java:5104) 
10-10 10:44:56.023: E/AndroidRuntime(2639):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080) 
10-10 10:44:56.023: E/AndroidRuntime(2639):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144) 
10-10 10:44:56.023: E/AndroidRuntime(2639):  ... 11 more 

Answer 1

Поскольку вы не инициализировать предпочтения. Вот проблема:

String dat = preferences.getString ("STOCK_CODE", "");

Answer 2

Ваш preferences объект имеет значение null.

Вам необходимо инициализировать его, прежде чем использовать его. Что-то вроде этого:

preferences = PreferenceManager.getDefaultSharedPreferences(this); 
String dat = preferences.getString("STOCK_CODE", ""); 

Answer 3

Если вы используете Eclipse, или любой другой IDE, вы должны дважды щелкнуть на строке ошибки, так что приведет вас прямо на источник, за исключением ...

10-10 10:44:56.023: E/AndroidRuntime(2639):  at com.manacle.umma.activity.StockLedgerRep.onCreate(StockLedgerRep.java:96) 

Должно быть на предпочтения вещи, как и другие пользователи предложить ...

Answer 4

вы можете написать этот код перед строкой 96.

preferences= getApplicationContext.getSharedPreferences("blablabla", Context.MODE_PRIVATE);