我正在为自己创建一个简单的应用程序，将信息发布到数据库。我对此非常陌生，并尝试按照一些教程和其他花絮来组装它。
有一个主屏幕进入第二个屏幕，其中有一个按钮（添加项目）。单击，这应该是构建/更新数据库。当事情发生之前我进入第二个屏幕时，我遇到了崩溃。我试图插入断点来调试，但我甚至无法到达任何地方。它不会在我的断点暂停（或者似乎没有），所以我看不出发生了什么
有人能指出正确的方向进行调试/修复吗？
这是我的第二个屏幕代码 - java
public class AddItem extends Activity {
private final String TAG = "Main Activity";
View view;
SQLiteDatabase db;
DbPrice dbprice ;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_add_item);
Log.i(TAG, "OnCreate");
dbprice = new DbPrice(this);
db = dbprice.getWritableDatabase();
Button addButton = (Button) findViewById(R.id.addNew);
addButton.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
String subcat,item,store,extra;
Integer day,month,year,price,quantity,weight,volume;
Boolean sale;
DatePicker datePicker1 = (DatePicker) findViewById(R.id.datePicker1);
AutoCompleteTextView autoCompleteSubCat = (AutoCompleteTextView) findViewById(R.id.autoCompleteSubCat);
EditText editItem = (EditText) findViewById(R.id.editItem);
EditText editPrice = (EditText) findViewById(R.id.editPrice);
EditText editQuantity = (EditText) findViewById(R.id.editQuantity);
EditText editWeight = (EditText) findViewById(R.id.editWeight);
EditText editVolume = (EditText) findViewById(R.id.editVolume);
CheckBox checkSale = (CheckBox) findViewById(R.id.checkSale);
AutoCompleteTextView autoCompleteStore = (AutoCompleteTextView) findViewById(R.id.autoCompleteStore);
EditText editExtra = (EditText) findViewById(R.id.editExtra);
day = datePicker1.getDayOfMonth();
month = datePicker1.getMonth();
year = datePicker1.getYear();
subcat = autoCompleteSubCat.getText().toString();
item = editItem.getText().toString();
extra = editExtra.getText().toString();
price = Integer.parseInt(editPrice.getText().toString());
quantity = Integer.parseInt(editQuantity.getText().toString());
weight = Integer.parseInt(editWeight.getText().toString());
volume = Integer.parseInt(editVolume.getText().toString());
// sale = checkSale.isChecked();
store = autoCompleteStore.getText().toString();
ContentValues cv = new ContentValues();
cv.put(DbPrice.SUBCAT, subcat);
cv.put(DbPrice.ITEM, item);
cv.put(DbPrice.EXTRA, extra);
cv.put(DbPrice.PRICE, price);
cv.put(DbPrice.QUANTITY, quantity);
cv.put(DbPrice.WEIGHT, weight);
cv.put(DbPrice.VOLUME, volume);
cv.put(DbPrice.SALE, sale);
cv.put(DbPrice.STORE, store);
db.insert(DbPrice.TABLE_NAME, null, cv);
}
});
}
@Override
public void onStart() {
super.onStart();
Log.i(TAG, "OnStart");
}
@Override
public void onResume() {
super.onResume();
Log.i(TAG, "OnResume");
}
public void OnPause() {
super.onPause();
Log.i(TAG,"OnPause");
}
public void OnStop() {
super.onStart();
Log.i(TAG, "OnStop");
}
public void OnDestroy() {
super.onDestroy();
Log.i(TAG, "OnDestroy");
}
public void addNewItem (View v) {
Log.i(TAG, "Starting New Activity");
Intent intent = new Intent (this, AllItems.class);
startActivity(intent);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.add_item, menu);
return true;
}
}
数据库类java如下。我不知道你是否也需要xml，但我加入了catlog。
public class DbPrice extends SQLiteOpenHelper {
public static final String DATABASE_NAME = "data";
public static final String TABLE_NAME = "price_table";
public static final String C_ID = "_id";
public static final String DAY = "day";
public static final String MONTH = "month";
public static final String YEAR = "day";
public static final String SUBCAT = "subcategory";
public static final String ITEM = "item";
public static final String PRICE = "price";
public static final String QUANTITY = "quantity";
public static final String WEIGHT = "weight";
public static final String VOLUME = "volume";
public static final String SALE = "sale";
public static final String STORE = "store";
public static final String EXTRA = "extra";
public static final int VERSION = 1;
private final String createDb = "create table if not exists " + TABLE_NAME+ " ( "
+ C_ID + " integer primary key autoincrement, "
+ DAY + " text, "
+ MONTH + " text, "
+ YEAR + " text, "
+ SUBCAT + " text, "
+ ITEM + " text, "
+ PRICE + " text, "
+ QUANTITY + " text, "
+ WEIGHT + " text, "
+ VOLUME + " text, "
+ SALE + " text, "
+ STORE + " text, "
+ EXTRA + " text) ";
public DbPrice(Context context) {
super(context, DATABASE_NAME, null, VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(createDb);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldversion, int newversion) {
db.execSQL("drop table " + TABLE_NAME);
}
}
CATLOG BELOW
12-29 01:27:20.834: I/Main Activity(1362): OnCreate
12-29 01:27:21.044: E/SQLiteLog(1362): (1) duplicate column name: day
12-29 01:27:21.054: D/AndroidRuntime(1362): Shutting down VM
12-29 01:27:21.064: W/dalvikvm(1362): threadid=1: thread exiting with uncaught exception (group=0xb4b11b90)
12-29 01:27:21.194: E/AndroidRuntime(1362): FATAL EXCEPTION: main
12-29 01:27:21.194: E/AndroidRuntime(1362): Process: com.unsuccessfulstudent.grocerypricehistory, PID: 1362
12-29 01:27:21.194: E/AndroidRuntime(1362): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.unsuccessfulstudent.grocerypricehistory/com.unsuccessfulstudent.grocerypricehistory.AddItem}: android.database.sqlite.SQLiteException: duplicate column name: day (code 1): , while compiling: create table if not exists price_table ( _id integer primary key autoincrement, day text, month text, day text, subcategory text, item text, price text, quantity text, weight text, volume text, sale text, store text, extra text)
12-29 01:27:21.194: E/AndroidRuntime(1362): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2176)
12-29 01:27:21.194: E/AndroidRuntime(1362): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2226)
12-29 01:27:21.194: E/AndroidRuntime(1362): at android.app.ActivityThread.access$700(ActivityThread.java:135)
12-29 01:27:21.194: E/AndroidRuntime(1362): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1397)
12-29 01:27:21.194: E/AndroidRuntime(1362): at android.os.Handler.dispatchMessage(Handler.java:102)
12-29 01:27:21.194: E/AndroidRuntime(1362): at android.os.Looper.loop(Looper.java:137)
12-29 01:27:21.194: E/AndroidRuntime(1362): at android.app.ActivityThread.main(ActivityThread.java:4998)
12-29 01:27:21.194: E/AndroidRuntime(1362): at java.lang.reflect.Method.invokeNative(Native Method)
12-29 01:27:21.194: E/AndroidRuntime(1362): at java.lang.reflect.Method.invoke(Method.java:515)
12-29 01:27:21.194: E/AndroidRuntime(1362): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777)
12-29 01:27:21.194: E/AndroidRuntime(1362): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:593)
12-29 01:27:21.194: E/AndroidRuntime(1362): at dalvik.system.NativeStart.main(Native Method)
12-29 01:27:21.194: E/AndroidRuntime(1362): Caused by: android.database.sqlite.SQLiteException: duplicate column name: day (code 1): , while compiling: create table if not exists price_table ( _id integer primary key autoincrement, day text, month text, day text, subcategory text, item text, price text, quantity text, weight text, volume text, sale text, store text, extra text)
12-29 01:27:21.194: E/AndroidRuntime(1362): at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
12-29 01:27:21.194: E/AndroidRuntime(1362): at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889)
12-29 01:27:21.194: E/AndroidRuntime(1362): at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500)
12-29 01:27:21.194: E/AndroidRuntime(1362): at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
12-29 01:27:21.194: E/AndroidRuntime(1362): at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
12-29 01:27:21.194: E/AndroidRuntime(1362): at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31)
12-29 01:27:21.194: E/AndroidRuntime(1362): at android.database.sqlite.SQLiteDatabase.executeSql(SQLiteDatabase.java:1672)
12-29 01:27:21.194: E/AndroidRuntime(1362): at android.database.sqlite.SQLiteDatabase.execSQL(SQLiteDatabase.java:1603)
12-29 01:27:21.194: E/AndroidRuntime(1362): at com.unsuccessfulstudent.grocerypricehistory.DbPrice.onCreate(DbPrice.java:49)
12-29 01:27:21.194: E/AndroidRuntime(1362): at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:252)
12-29 01:27:21.194: E/AndroidRuntime(1362): at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:164)
12-29 01:27:21.194: E/AndroidRuntime(1362): at com.unsuccessfulstudent.grocerypricehistory.AddItem.onCreate(AddItem.java:31)
12-29 01:27:21.194: E/AndroidRuntime(1362): at android.app.Activity.performCreate(Activity.java:5243)
12-29 01:27:21.194: E/AndroidRuntime(1362): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
12-29 01:27:21.194: E/AndroidRuntime(1362): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2140)
12-29 01:27:21.194: E/AndroidRuntime(1362): ... 11 more
12-29 01:27:24.554: I/Process(1362): Sending signal. PID: 1362 SIG: 9
答案 0 :(得分：4)
您的应用程序崩溃的原因是由于您在数据库创建查询中定义了两次相同的密钥。这就是为什么你得到一个重复的列错误。
您拥有的密钥，即DAY和YEAR都具有相同的值day。在具有相同名称的数据库中不能有两列。因此，要解决此问题，您需要做的就是将YEAR定义更改为 -
public static final String YEAR = "year";
希望这有帮助!!!
答案 1 :(得分：1)
您使用两个相同的列
代码：
create table if not exists price_table
(
_id integer primary key autoincrement,
"**day**" text,
month text,
"**day**" text,...
)
答案 2 :(得分：0)
每当有异常时，如果在Logcat中看到一行FATAL EXCEPTION: main，请查看以下行。带有Unable to start activity ComponentInfo的行会让您清楚了解异常原因。Caused by:开头的行。
所以这里你的问题是“重复列名：day” 您还可以导航到导致异常的特定行。只需查找您的包名称即可。在这种情况下，
12-29 01:27:21.194: E/AndroidRuntime(1362): at com.unsuccessfulstudent.grocerypricehistory.DbPrice.onCreate(DbPrice.java:49)
12-29 01:27:21.194: E/AndroidRuntime(1362): at com.unsuccessfulstudent.grocerypricehistory.AddItem.onCreate(AddItem.java:31)
在行的末尾，有相应的类和行号。请注意，这些是导致异常的行，但异常的原因可能在其他地方。在这种情况下，String YEAR