我知道 java.lang.IllegalArgumentException:索引 1 处的绑定(bind)值为 null 的含义以及导致错误的原因。就我的情况而言，我仍然无法找到此类错误的原因。
那么，我打算实现什么目标？
我的 SQLite 数据库表中有 4 列。我想找到每列的总和，然后再次找到这四个结果的总和。 sum 的行值根据用户从 autoCompleteTextView 中选择的产品名称进行过滤。
我在哪里收到错误？
我的 stackTrace 说我在下面的代码中以 Cursor c = db.query... 开头的行中收到错误。以下代码是我的 android 项目的 db 文件的一部分。
public int addPurchaseQuantity(String itemName) {
SQLiteDatabase db = helper.getReadableDatabase();
int result = 0;
String selection = VivzHelper.COLUMN_ADD_PURCHASE_ITEM_NAME + " =? ";
String[] selectionArgs = {itemName};
Cursor c = db.query(VivzHelper.ADD_PURCHASE_TABLE,
new String[]{"sum(" + VivzHelper.COLUMN_ADD_PURCHASE_ITEM_QUANTITY + ")"},
selection,
selectionArgs,
null,
null,
null);
if (c.moveToFirst()) {
result = c.getInt(0);
}
c.close();
return result;
}
itemName是根据用户选择从autoCompleteTextView获取的。
String[] autoCompleteName = vivzHelper.getInventoryNameFilterBySupplierName(vivzHelper.getSupplierID(param1));
ArrayAdapter<String> NameAdapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, autoCompleteName);
addPurchaseItemName.setThreshold(1);// starts working from first char
addPurchaseItemName.setAdapter(NameAdapter);
addPurchaseItemName.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
itemName = String.valueOf(arg0.getItemAtPosition(arg2));
}
});
我的 stackTrace 还指向 java Activity 文件的以下代码。
int purchaseQty = vivzHelper.addPurchaseQuantity(itemName);
这是我的堆栈跟踪
04-21 00:09:58.274 21975-21975/com.example.bharathduraiswamy.comboedittext E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.bharathduraiswamy.comboedittext/com.example.bharathduraiswamy.comboedittext.AddPurchase}: java.lang.IllegalArgumentException: the bind value at index 1 is null
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2313)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2365)
at android.app.ActivityThread.access$600(ActivityThread.java:156)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:153)
at android.app.ActivityThread.main(ActivityThread.java:5336)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.IllegalArgumentException: the bind value at index 1 is null
at android.database.sqlite.SQLiteProgram.bindString(SQLiteProgram.java:164)
at android.database.sqlite.SQLiteProgram.bindAllArgsAsStrings(SQLiteProgram.java:200)
at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:47)
at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1314)
at android.database.sqlite.SQLiteDatabase.queryWithFactory(SQLiteDatabase.java:1161)
at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1032)
at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1200)
at com.example.bharathduraiswamy.comboedittext.VivzDatabaseAdapter.addPurchaseQuantity(VivzDatabaseAdapter.java:2011)
at com.example.bharathduraiswamy.comboedittext.AddPurchase.aggregateQty(AddPurchase.java:531)
at com.example.bharathduraiswamy.comboedittext.AddPurchase.onCreate(AddPurchase.java:133)
at android.app.Activity.performCreate(Activity.java:5122)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1081)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2277)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2365)
at android.app.ActivityThread.access$600(ActivityThread.java:156)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:153)
at android.app.ActivityThread.main(ActivityThread.java:5336)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
at dalvik.system.NativeStart.main(Native Method)
有人可以告诉我我到底哪里出了问题吗？
更新 01:添加了 AddPurchase Activity 中的 onCreate()
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.add_purchase);
// Set a toolbar to replace the action bar
Toolbar myToolbar = (Toolbar) findViewById(R.id.toolbar_addPurchase);
setSupportActionBar(myToolbar);
myToolbar.setNavigationIcon(R.drawable.logo);
//Disable the Toolbar Title
getSupportActionBar().setDisplayShowTitleEnabled(false);
// Adding UP icon for Setting Activity
getSupportActionBar().setHomeButtonEnabled(true);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
SharedPreferences myPreferences = getSharedPreferences("sharedSupplierData", Context.MODE_PRIVATE);
param1 = myPreferences.getString("sharedSupplierName", DEFAULT);
if (param1.equals(DEFAULT)) {
Message.message(this, "No data was found");
}
addPurchaseItemName = (AutoCompleteTextView) findViewById(R.id.addPurchaseProductName);
addPurchaseItemQty = (EditText) findViewById(R.id.addPurchaseProductQuantity);
addPurchaseCostPrice = (EditText) findViewById(R.id.addPurchaseCostPrice);
addPurchaseSalePrice = (EditText) findViewById(R.id.addPurchaseSalePrice);
myDate = (TextView) findViewById(R.id.addPurchaseDatum);
purchaseSum = (TextView) findViewById(R.id.addPurchaseSum);
primarySpinner = (Spinner) findViewById(R.id.toolbar_spinner);
vivzHelper = new VivzDatabaseAdapter(this);
showDialogOnButtonClick();
populateListView();
String[] autoCompleteName = vivzHelper.getInventoryNameFilterBySupplierName(vivzHelper.getSupplierID(param1));
ArrayAdapter<String> NameAdapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, autoCompleteName);
addPurchaseItemName.setThreshold(1);// starts working from first char
addPurchaseItemName.setAdapter(NameAdapter);
addPurchaseItemName.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
itemName = String.valueOf(arg0.getItemAtPosition(arg2));
}
});
Message.message(this, ("Item Name = " + itemName));
aggregateQty();
//Initializing an Adapter
ArrayAdapter<String> toolbar_adapter = new ArrayAdapter<>(
this, android.R.layout.simple_spinner_dropdown_item, primarySpinner_array);
//Providing the Resource xml for Drop down Layout
toolbar_adapter.setDropDownViewResource(R.layout.custom_simple_spinner_dropdown_item);
primarySpinner.setAdapter(toolbar_adapter);
//Setting a default Spinner value before onItemClick
primarySpinner.setSelection(0);
//Initializing an OnItemClick Listener for Spinner Item
primarySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
int position_toolbar = primarySpinner.getSelectedItemPosition();
//Changing Spinner TextSize and Text Color
((TextView) arg0.getChildAt(0)).setTextColor(Color.WHITE);
((TextView) arg0.getChildAt(0)).setTextSize(20);
//Changing Spinner Pointer Color - partially effective
primarySpinner.getBackground().setColorFilter(getResources().getColor(R.color.White), PorterDuff.Mode.SRC_ATOP);
//Using Switch to move to other Activities
Intent intent_spinner;
switch (arg2) {
case 1:
intent_spinner = new Intent(AddPurchase.this, SupplierDues.class);
AddPurchase.this.startActivity(intent_spinner);
break;
case 2:
intent_spinner = new Intent(AddPurchase.this, SupplierReturns.class);
AddPurchase.this.startActivity(intent_spinner);
break;
case 3:
intent_spinner = new Intent(AddPurchase.this, SupplierBalanceSheet.class);
AddPurchase.this.startActivity(intent_spinner);
break;
case 4:
intent_spinner = new Intent(AddPurchase.this, AddSupplier.class);
AddPurchase.this.startActivity(intent_spinner);
break;
default:
break;
}
//Changing Spinner Pointer Color - partially effective
primarySpinner.getBackground().setColorFilter(getResources().getColor(R.color.White), PorterDuff.Mode.SRC_ATOP);
//Setting a default Spinner value after onItemClick
primarySpinner.setSelection(0);
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
});
}
更新 02:调用 addPurchaseQuantity() 时的aggregateQty()
public void aggregateQty() {
int purchaseQty = vivzHelper.addPurchaseQuantity(itemName);
int saleQty = vivzHelper.addSaleQuantity(itemName);
int supplierRtnQty = vivzHelper.returnedToSupplierQuantity(itemName, rtnPrice);
int supplierRtnScrapQty = vivzHelper.returnedToSupplierForScrapQuantity(itemName, rtnPrice);
int customerRtnQty = vivzHelper.returnedByCustomerQuantity(itemName, rtnPrice);
if (itemName.length() != 0) {
availableQuantity = String.valueOf(purchaseQty - saleQty - supplierRtnQty - supplierRtnScrapQty + customerRtnQty);
addPurchaseItemQty.setHint(availableQuantity);
Message.message(this, ("Item Name = " + itemName + "\n" +
"Purchase Quantity = " + purchaseQty + "\n" +
"Sale Quantity = " + saleQty + "\n" +
"Supplier Return Quantity = " + supplierRtnQty + "\n" +
"Customer Return Quantity = " + customerRtnQty));
} else {
Message.message(this, "Please Select an Item");
}
}
最佳答案
itemName 在 addPurchaseQuantity() 调用中为 null，因此当 SQLite 尝试使用它来替换选择参数('?' )您收到此异常。
尝试将 itemName 设置为已知值并检查结果。
编辑
您应该独立测试每个方法，以便可以轻松发现错误或错误。学习如何应用单元测试，如 Testing Fundamentals 中所述。 .
然后，您会发现问题减少了，可以从 AutoCompletTextView 获取文本值，您可以在其中找到大量示例(即 How to get string text from AutoCompleteTextView? )。
关于java - 为什么我收到 java.lang.IllegalArgumentException : the bind value at index 1 is null in this case?，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/29762009/