StockLedgerRpt类显示空指针异常。此类在微调器视图中显示一个列表以选择库存项目。
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这个xml显示三个东西，一个是微调器库存项目列，另外两个是选择日期。我无法得到错误。请帮助。甚至在androidmanifest.xml中添加
<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的
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
答案 0 :(得分：4)
您的preferences对象为空。
您需要在使用之前对其进行初始化。像这样：
preferences = PreferenceManager.getDefaultSharedPreferences(this);
String dat = preferences.getString("STOCK_CODE", "");
答案 1 :(得分：1)
因为您没有初始化首选项。这是问题所在：
String dat = preferences.getString（“STOCK_CODE”，“”）;
答案 2 :(得分：0)
如果你使用Eclipse或任何其他IDE，你应该双击错误行，这样就可以直接找到异常来源...
10-10 10:44:56.023: E/AndroidRuntime(2639): at com.manacle.umma.activity.StockLedgerRep.onCreate(StockLedgerRep.java:96)
应该像其他用户一样建议偏好...
答案 3 :(得分：0)
您可以在第96行之前编写此代码。
preferences= getApplicationContext.getSharedPreferences("blablabla", Context.MODE_PRIVATE);