我知道有关此问题的多个主题;但我无法解决CursorIndexOutOfBoundsException。 我正在尝试使用游标填充我的查询并将结果提取到listview.But每当调用第二个活动（用于创建列表视图）时，应用程序崩溃。在logcat中它说“CursorIndexOutOfBoundsException：索引-1请求，大小为0” 我正在附加代码段以便更好地理解。 DatabaseHandler.java
public class DatabaseHandler extends SQLiteAssetHelper {
// for our logs
public static final String TAG = "DatabaseHandler.java";
// database version
private static final int DATABASE_VERSION = 1;
// database name
protected static final String DB_NAME = "med2";
public static String DB_PATH;
// table details
public String tableName = "allopathmedicine";
public String _id = "_id";
public String fieldObjectName = "medicinename";
public String medtype = "medicinetype";
public String companyname = "companyname";
public String medgroup = "medicinegroup";
public String medfor ="medicinefor";
public String medid = "registrationid";
public String p;
private SQLiteDatabase database;
private Context context;
public long id2;
// constructor
public DatabaseHandler(Context context) throws IOException {
super(context, DB_NAME, null, DATABASE_VERSION);
this.context=context;
this.database= getReadableDatabase();
}
/*
* Read records related to the search term
*/
public MyObject[] read(String searchTerm) {
// select query
String sql = "";
sql += "SELECT * FROM " + tableName;
sql += " WHERE " + fieldObjectName + " LIKE '" + searchTerm + "%'";
sql += " ORDER BY " + _id + " DESC";
sql += " LIMIT 0,15";
SQLiteDatabase db = this.getWritableDatabase();
// execute the query
Cursor cursor = db.rawQuery(sql, null);
int recCount = cursor.getCount();
MyObject[] ObjectItemData = new MyObject[recCount];
int x = 0;
// looping through all rows and adding to list
if (cursor.moveToFirst()) {
do {
String objectName = cursor.getString(cursor.getColumnIndex(fieldObjectName));
id2 = cursor.getInt(cursor.getColumnIndexOrThrow(_id));
Log.e(TAG, "objectName: " + objectName);
MyObject myObject = new MyObject(objectName);
ObjectItemData[x] = myObject;
x++;
} while (cursor.moveToNext());
}
cursor.close();
db.close();
p= ObjectItemData.toString();
return ObjectItemData;
}
public Cursor get() throws IOException
{
return this.Getmedicine(id2);
}
public Cursor Getmedicine(long id2) throws SQLException {
SQLiteDatabase db = this.getWritableDatabase();
Cursor mCursor =
db.query(true, tableName, new String[] {medid,_id,
medfor, medtype,fieldObjectName}, _id + " = " + id2, null,
null, null, null, null);
String rid = mCursor.getString(mCursor.getColumnIndex(medid));
mCursor.moveToFirst();
if (mCursor != null) {
mCursor.moveToFirst();
}
mCursor.close();
db.close();
return mCursor;
}
/*public ArrayList<Medicineinfo> getmedDetails(String ObjectItemData) throws SQLException {
SQLiteDatabase db = this.getReadableDatabase();
ArrayList<Medicineinfo> getmedDetails = new ArrayList<Medicineinfo>();
Cursor cursor =
db.query(true,tableName, new String[] {
fieldObjectName,
medtype,
companyname,
medgroup},
fieldObjectName + "=?" ,
new String[] {ObjectItemData},
null, null, null , null);
if (cursor.moveToFirst()) {
do {
Medicineinfo Medicineinfo= new Medicineinfo();
Medicineinfo.setMedfor(cursor.getString(cursor.getColumnIndexOrThrow(medfor)));
Medicineinfo.setMedid (cursor.getString(cursor.getColumnIndex(medid)));
//Medicineinfo.comName( cursor.getString(cursor.getColumnIndex(companyname)));
Medicineinfo.setMedgroup(cursor.getString(cursor.getColumnIndex(medgroup)));
Medicineinfo.setMedtype(cursor.getString(cursor.getColumnIndex(medtype)));
getmedDetails.add(Medicineinfo);
} while (cursor.moveToNext());
}
if (cursor != null && !cursor.isClosed()) {
cursor.close();
}
return getmedDetails;
}*/
}
Detailinformation.java
public class Detailinformation extends ListActivity {
private Cursor mcursor;
SimpleCursorAdapter adapter;
// for database operations
DatabaseHandler databaseH;
@Override
protected void onCreate(Bundle savedInstanceState) throws SQLException {
super.onCreate(savedInstanceState);
setContentView(R.layout.details);
// get data from cursor
try {
databaseH = new DatabaseHandler(Detailinformation.this);
// put sample data to database
mcursor = databaseH.get();
mcursor.moveToFirst();
SimpleCursorAdapter adapter = new SimpleCursorAdapter(this,
android.R.layout.simple_list_item_2,
databaseH.get(),
new String[] { "_id", "medid" },
new int[] { android.R.id.text1, android.R.id.text2 });
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
ListView lv = (ListView) findViewById(android.R.id.list);
lv.setAdapter(adapter);
}
//get data from arraylist
protected void onDestroy() {
super.onDestroy();
mcursor.close();
}
}
logcat的：
01-31 23:39:50.942: E/SQLiteLog(2629): (14) cannot open file at line 30046 of [9491ba7d73]
01-31 23:39:50.942: E/SQLiteLog(2629): (14) os_unix.c:30046: (2) open(/data/data/com.com.mity.medicalinformationbd/databases/med2) -
01-31 23:39:50.948: I/art(2629): Background sticky concurrent mark sweep GC freed 1806(102KB) AllocSpace objects, 0(0B) LOS objects, 33% free, 412KB/623KB, paused 1.226ms total 135.625ms
01-31 23:39:50.995: E/SQLiteDatabase(2629): Failed to open database '/data/data/com.com.mity.medicalinformationbd/databases/med2'.
01-31 23:39:50.995: E/SQLiteDatabase(2629): android.database.sqlite.SQLiteCantOpenDatabaseException: unknown error (code 14): Could not open database
01-31 23:39:50.995: E/SQLiteDatabase(2629): at android.database.sqlite.SQLiteConnection.nativeOpen(Native Method)
01-31 23:39:50.995: E/SQLiteDatabase(2629): at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:193)
01-31 23:39:50.995: E/SQLiteDatabase(2629): at android.database.sqlite.SQLiteConnectionPool.openConnectionLocked(SQLiteConnectionPool.java:463)
01-31 23:39:50.995: E/SQLiteDatabase(2629): at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:185)
01-31 23:39:50.995: E/SQLiteDatabase(2629): at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:177)
01-31 23:39:50.995: E/SQLiteDatabase(2629): at android.database.sqlite.SQLiteDatabase.openInner(SQLiteDatabase.java:806)
01-31 23:39:50.995: E/SQLiteDatabase(2629): at android.database.sqlite.SQLiteDatabase.open(SQLiteDatabase.java:791)
01-31 23:39:50.995: E/SQLiteDatabase(2629): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:694)
01-31 23:39:50.995: E/SQLiteDatabase(2629): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:669)
01-31 23:39:50.995: E/SQLiteDatabase(2629): at com.readystatesoftware.sqliteasset.SQLiteAssetHelper.returnDatabase(SQLiteAssetHelper.java:363)
01-31 23:39:50.995: E/SQLiteDatabase(2629): at com.readystatesoftware.sqliteasset.SQLiteAssetHelper.createOrOpenDatabase(SQLiteAssetHelper.java:344)
01-31 23:39:50.995: E/SQLiteDatabase(2629): at com.readystatesoftware.sqliteasset.SQLiteAssetHelper.getWritableDatabase(SQLiteAssetHelper.java:178)
01-31 23:39:50.995: E/SQLiteDatabase(2629): at com.readystatesoftware.sqliteasset.SQLiteAssetHelper.getReadableDatabase(SQLiteAssetHelper.java:257)
01-31 23:39:50.995: E/SQLiteDatabase(2629): at com.mity.medicalinformationbd.DatabaseHandler.<init>(DatabaseHandler.java:56)
01-31 23:39:50.995: E/SQLiteDatabase(2629): at com.mity.medicalinformationbd.MainActivity.onCreate(MainActivity.java:43)
01-31 23:39:50.995: E/SQLiteDatabase(2629): at android.app.Activity.performCreate(Activity.java:5933)
01-31 23:39:50.995: E/SQLiteDatabase(2629): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
01-31 23:39:50.995: E/SQLiteDatabase(2629): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2251)
01-31 23:39:50.995: E/SQLiteDatabase(2629): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
01-31 23:39:50.995: E/SQLiteDatabase(2629): at android.app.ActivityThread.access$800(ActivityThread.java:144)
01-31 23:39:50.995: E/SQLiteDatabase(2629): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
01-31 23:39:50.995: E/SQLiteDatabase(2629): at android.os.Handler.dispatchMessage(Handler.java:102)
01-31 23:39:50.995: E/SQLiteDatabase(2629): at android.os.Looper.loop(Looper.java:135)
01-31 23:39:50.995: E/SQLiteDatabase(2629): at android.app.ActivityThread.main(ActivityThread.java:5221)
01-31 23:39:50.995: E/SQLiteDatabase(2629): at java.lang.reflect.Method.invoke(Native Method)
01-31 23:39:50.995: E/SQLiteDatabase(2629): at java.lang.reflect.Method.invoke(Method.java:372)
01-31 23:39:50.995: E/SQLiteDatabase(2629): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
01-31 23:39:50.995: E/SQLiteDatabase(2629): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
01-31 23:39:50.995: W/SQLiteAssetHelper(2629): could not open database med2 - unknown error (code 14): Could not open database
01-31 23:39:50.995: W/SQLiteAssetHelper(2629): copying database from assets...
01-31 23:39:51.102: W/SQLiteAssetHelper(2629): extracting file: 'med2.db'...
01-31 23:39:51.632: W/SQLiteAssetHelper(2629): database copy complete
01-31 23:39:51.667: I/art(2629): Background partial concurrent mark sweep GC freed 506(88KB) AllocSpace objects, 0(0B) LOS objects, 55% free, 411KB/923KB, paused 8.723ms total 35.226ms
01-31 23:39:51.691: I/SQLiteAssetHelper(2629): successfully opened database med2
01-31 23:39:52.624: D/gralloc_goldfish(2629): Emulator without GPU emulation detected.
01-31 23:48:16.207: I/Choreographer(2629): Skipped 130 frames! The application may be doing too much work on its main thread.
01-31 23:48:17.672: E/CustomAutoCompleteTextChangedListener.java(2629): User input: a
01-31 23:48:17.949: E/DatabaseHandler.java(2629): objectName: Anestic Cream
01-31 23:48:17.950: E/DatabaseHandler.java(2629): objectName: Alconil Mouthwash
01-31 23:48:17.950: E/DatabaseHandler.java(2629): objectName: Albamax DS
01-31 23:48:17.950: E/DatabaseHandler.java(2629): objectName: Analac
01-31 23:48:17.950: E/DatabaseHandler.java(2629): objectName: Atolip 10
01-31 23:48:17.950: E/DatabaseHandler.java(2629): objectName: Avloxin 500
01-31 23:48:17.950: E/DatabaseHandler.java(2629): objectName: Avloxin
01-31 23:48:17.950: E/DatabaseHandler.java(2629): objectName: Avloxin 250
01-31 23:48:17.950: E/DatabaseHandler.java(2629): objectName: Avlotrin
01-31 23:48:17.950: E/DatabaseHandler.java(2629): objectName: Avlotrin
01-31 23:48:17.950: E/DatabaseHandler.java(2629): objectName: Avlotrin
01-31 23:48:17.950: E/DatabaseHandler.java(2629): objectName: Avlosef 500
01-31 23:48:17.950: E/DatabaseHandler.java(2629): objectName: Avlosef
01-31 23:48:17.950: E/DatabaseHandler.java(2629): objectName: Avlosef DS 250
01-31 23:48:17.950: E/DatabaseHandler.java(2629): objectName: Avlosef 500 mg
01-31 23:48:18.366: I/Choreographer(2629): Skipped 36 frames! The application may be doing too much work on its main thread.
01-31 23:48:20.109: I/Choreographer(2629): Skipped 45 frames! The application may be doing too much work on its main thread.
01-31 23:48:20.340: E/CustomAutoCompleteTextChangedListener.java(2629): User input: com.mity.medicalinformationbd.MyObject@26b3e612
01-31 23:48:20.410: I/SQLiteAssetHelper(2629): successfully opened database med2
01-31 23:48:20.555: E/CustomAutoCompleteTextChangedListener.java(2629): User input: Anestic Cream
01-31 23:48:20.575: I/SQLiteAssetHelper(2629): successfully opened database med2
01-31 23:48:20.619: E/DatabaseHandler.java(2629): objectName: Anestic Cream
01-31 23:48:20.766: I/Choreographer(2629): Skipped 150 frames! The application may be doing too much work on its main thread.
01-31 23:48:21.846: I/SQLiteAssetHelper(2629): successfully opened database med2
01-31 23:48:22.099: D/AndroidRuntime(2629): Shutting down VM
01-31 23:48:22.099: D/AndroidRuntime(2629): --------- beginning of crash
01-31 23:48:22.309: E/AndroidRuntime(2629): FATAL EXCEPTION: main
01-31 23:48:22.309: E/AndroidRuntime(2629): Process: com.com.mity.medicalinformationbd, PID: 2629
01-31 23:48:22.309: E/AndroidRuntime(2629): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.com.mity.medicalinformationbd/com.mity.medicalinformationbd.Detailinformation}: android.database.CursorIndexOutOfBoundsException: Index -1 requested, with a size of 0
01-31 23:48:22.309: E/AndroidRuntime(2629): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2298)
01-31 23:48:22.309: E/AndroidRuntime(2629): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
01-31 23:48:22.309: E/AndroidRuntime(2629): at android.app.ActivityThread.access$800(ActivityThread.java:144)
01-31 23:48:22.309: E/AndroidRuntime(2629): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
01-31 23:48:22.309: E/AndroidRuntime(2629): at android.os.Handler.dispatchMessage(Handler.java:102)
01-31 23:48:22.309: E/AndroidRuntime(2629): at android.os.Looper.loop(Looper.java:135)
01-31 23:48:22.309: E/AndroidRuntime(2629): at android.app.ActivityThread.main(ActivityThread.java:5221)
01-31 23:48:22.309: E/AndroidRuntime(2629): at java.lang.reflect.Method.invoke(Native Method)
01-31 23:48:22.309: E/AndroidRuntime(2629): at java.lang.reflect.Method.invoke(Method.java:372)
01-31 23:48:22.309: E/AndroidRuntime(2629): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
01-31 23:48:22.309: E/AndroidRuntime(2629): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
01-31 23:48:22.309: E/AndroidRuntime(2629): Caused by: android.database.CursorIndexOutOfBoundsException: Index -1 requested, with a size of 0
01-31 23:48:22.309: E/AndroidRuntime(2629): at android.database.AbstractCursor.checkPosition(AbstractCursor.java:426)
01-31 23:48:22.309: E/AndroidRuntime(2629): at android.database.AbstractWindowedCursor.checkPosition(AbstractWindowedCursor.java:136)
01-31 23:48:22.309: E/AndroidRuntime(2629): at android.database.AbstractWindowedCursor.getString(AbstractWindowedCursor.java:50)
01-31 23:48:22.309: E/AndroidRuntime(2629): at com.mity.medicalinformationbd.DatabaseHandler.Getmedicine(DatabaseHandler.java:122)
01-31 23:48:22.309: E/AndroidRuntime(2629): at com.mity.medicalinformationbd.DatabaseHandler.get(DatabaseHandler.java:113)
01-31 23:48:22.309: E/AndroidRuntime(2629): at com.mity.medicalinformationbd.Detailinformation.onCreate(Detailinformation.java:56)
01-31 23:48:22.309: E/AndroidRuntime(2629): at android.app.Activity.performCreate(Activity.java:5933)
01-31 23:48:22.309: E/AndroidRuntime(2629): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
01-31 23:48:22.309: E/AndroidRuntime(2629): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2251)
01-31 23:48:22.309: E/AndroidRuntime(2629): ... 10 more
01-31 23:48:22.370: I/art(2629): Background sticky concurrent mark sweep GC freed 2136(154KB) AllocSpace objects, 0(0B) LOS objects, 24% free, 692KB/923KB, paused 1.806ms total 213.658ms
01-31 23:48:25.600: I/Process(2629): Sending signal. PID: 2629 SIG: 9