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こんにちは皆私はいくつかの困難を抱えてきました。私は大学のための私のタイムテーブルを保存するための小さなプログラムを作成しようとしています。私はSQliteデータベースに何らかの問題を抱えていましたが、それは私を困惑させました。
プログラムを最初に実行すると強制的に終了します logcatでこのエラーが発生します
原因：android.database CursorIndexOutOfBoundsException：インデックス0が要求されました。サイズが0の場合 アプリケーションを再び開くと、テーブルが作成され、アプリケーションが正常に動作します。 テーブルが最初に作成されていない理由はわかりません。
コードは次のとおりです。ここで
SqliteデータベースにアクセスするときにCursorIndexOutOfBoundsExceptionが発生する
public class Monday extends ListActivity {
int pos = 0, timeInt, count;
String[] times = {"0900-1030","1040-1220","Lunch 1220-1325","1325-1455", "1500-1630"};
String[][] content;
String dayString = "Monday", timeString;
EditText EditTextLesson, EditTextLocation, EditTextTutor, EditTextNotes;
Button btnSave, btnCancel , btnDelete;
Dialog edit;
Intent zoom , mapweb;
Cursor all, getRow;
MonDBAdapter mon;
DBAdapter db;
ListView lv;
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.timetablelistview);
content= new String [10][10];
edit = new Dialog(Monday.this);
lv = (ListView) findViewById(android.R.id.list);
lv.addFooterView(buildFooter());
zoom =new Intent(this,Zoom.class);
mapweb =new Intent(this,MapWebView.class);
db = new DBAdapter(this);
db.open();
mon = new MonDBAdapter(this);
mon.open();
all = mon.getAllEntries();
count = all.getCount();
if(count < 4){
for(int i = 0; i < 5; i++){
mon.createEntry("", "", "", "");
}
}
addSections();
}
public void onListItemClick(ListView parent, View v, int position, long id){
switch(position){
case 1:
timeInt= 1;
timeString=("0900-1030");
break;
case 3:
timeInt= 2;
timeString=("1040-1220");
break;
case 5:
timeInt= 3;
timeString=("1220-1325");
break;
case 7:
timeInt= 4;
timeString=("1325-1455");
break;
case 9:
timeInt= 5;
timeString=("1500-1630");
break;
}
editDialog();
}
SectionedAdapter adapter=new SectionedAdapter() {
protected View getHeaderView(String caption, int index,
View convertView,
ViewGroup parent) {
TextView result=(TextView)convertView;
if (convertView==null) {
result=(TextView)getLayoutInflater().inflate(R.layout.header,
null);
}
result.setText(caption);
return(result);
}
};
public void addSections(){
all.moveToFirst();
for(int i = 0; i < 5; i++){
getSectionContent(
times[i],
all.getString(1),
all.getString(2),
all.getString(3),
all.getString(4));
all.moveToNext();
}
}
public void getSectionContent(String time,String lesson,String location,String tutor,String notes){
//adapter to add content to each section
String[] from = new String[] {"lesson", "location", "tutor", "notes"};
int[] to = new int[] {R.id.textViewLesson, R.id.textViewLocation, R.id.textViewTutor, R.id.textViewNotes };
// prepare the list of all records
List<HashMap<String, String>> fillMaps = new ArrayList<HashMap<String, String>>();
HashMap<String, String> map = new HashMap<String, String>();
map.put("lesson", lesson);
map.put("location", location);
map.put("tutor", tutor);
map.put("notes", notes);
fillMaps.add(map);
SimpleAdapter adapter1 = new SimpleAdapter(this, fillMaps, R.layout.list_view_item, from, to);
adapter.addSection(time,adapter1);
lv.setAdapter(adapter);
}
public void editDialog(){
getRow = mon.getEntry(timeInt);
edit.setTitle("Edit "+ dayString + " " + timeString);
edit.setContentView(R.layout.edit);
edit.setCancelable(true);
btnSave = (Button)edit.findViewById(R.id.btnSave);
btnCancel = (Button)edit.findViewById(R.id.btnCancel);
btnDelete = (Button)edit.findViewById(R.id.btnDelete);
EditTextLesson=(EditText)edit.findViewById(R.id.editTextLesson);
EditTextLocation=(EditText)edit.findViewById(R.id.editTextLocation);
EditTextTutor=(EditText)edit.findViewById(R.id.editTextTutor);
EditTextNotes=(EditText)edit.findViewById(R.id.editTextNotes);
EditTextLesson.setText(getRow.getString(1));
EditTextLocation.setText(getRow.getString(2));
EditTextTutor.setText(getRow.getString(3));
EditTextNotes.setText(getRow.getString(4));
btnCancel.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
edit.cancel();
}
});
btnSave.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
//starts at 1 as 0 contain the section time
mon.updateEntry(timeInt,EditTextLesson.getText().toString(),EditTextLocation.getText().toString(), EditTextTutor.getText().toString(),EditTextNotes.getText().toString());
all.requery();
adapter.sections.clear();
addSections();
edit.cancel();
}
});
btnDelete.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
EditTextLesson.setText("");
EditTextLocation.setText("");
EditTextTutor.setText("");
EditTextNotes.setText("");
}
});
edit.show();
}
private View buildFooter() {
Button btn=new Button(this);
btn.setText("Campus map");
btn.setTextSize(18);
btn.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
if(VERSION.SDK.equals("4")||VERSION.SDK.equals("3")||VERSION.SDK.equals("2")||VERSION.SDK.equals("1")){
startActivity(zoom);
}else{
startActivity(mapweb);
}
}
});
return(btn);
}
}
public class DBAdapter {
public static final String DATABASE_NAME = "timetable";
public static final int DATABASE_VERSION = 1;
private static final String MONDAY =
"create table monday (_id integer primary key autoincrement, "
+ MonDBAdapter.LESSON+ " TEXT,"
+ MonDBAdapter.LOCATION+ " TEXT,"
+ MonDBAdapter.TUTOR+ " TEXT,"
+ MonDBAdapter.NOTES+ " TEXT" + ");";
private static final String TUESDAY =
"create table tuesday (_id integer primary key autoincrement, "
+ MonDBAdapter.LESSON+ " TEXT,"
+ MonDBAdapter.LOCATION+ " TEXT,"
+ MonDBAdapter.TUTOR+ " TEXT,"
+ MonDBAdapter.NOTES+ " TEXT" + ");";
private static final String WEDNESDAY =
"create table wednesday (_id integer primary key autoincrement, "
+ MonDBAdapter.LESSON+ " TEXT,"
+ MonDBAdapter.LOCATION+ " TEXT,"
+ MonDBAdapter.TUTOR+ " TEXT,"
+ MonDBAdapter.NOTES+ " TEXT" + ");";
private static final String THURSDAY =
"create table thursday (_id integer primary key autoincrement, "
+ MonDBAdapter.LESSON+ " TEXT,"
+ MonDBAdapter.LOCATION+ " TEXT,"
+ MonDBAdapter.TUTOR+ " TEXT,"
+ MonDBAdapter.NOTES+ " TEXT" + ");";
private static final String FRIDAY =
"create table friday (_id integer primary key autoincrement, "
+ MonDBAdapter.LESSON+ " TEXT,"
+ MonDBAdapter.LOCATION+ " TEXT,"
+ MonDBAdapter.TUTOR+ " TEXT,"
+ MonDBAdapter.NOTES+ " TEXT" + ");";
private final Context context;
private DatabaseHelper DBHelper;
private SQLiteDatabase db;
public DBAdapter(Context ctx)
{
this.context = ctx;
this.DBHelper = new DatabaseHelper(this.context);
}
private static class DatabaseHelper extends SQLiteOpenHelper
{
DatabaseHelper(Context context)
{
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db)
{
db.execSQL(MONDAY);
db.execSQL(TUESDAY);
db.execSQL(WEDNESDAY);
db.execSQL(THURSDAY);
db.execSQL(FRIDAY);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion,
int newVersion)
{
}
}
public DBAdapter open() throws SQLException
{
this.db = this.DBHelper.getWritableDatabase();
return this;
}
public void close()
{
this.DBHelper.close();
}
}
public class MonDBAdapter {
public static final String ROW_ID = "_id";
public static final String LESSON = "name";
public static final String LOCATION = "model";
public static final String TUTOR = "year";
public static final String NOTES = "notes";
private static final String MONDAY= "monday";
private DatabaseHelper mDbHelper;
private SQLiteDatabase mDb;
private final Context mCtx;
private static class DatabaseHelper extends SQLiteOpenHelper {
DatabaseHelper(Context context) {
super(context, DBAdapter.DATABASE_NAME, null, DBAdapter.DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
}
public MonDBAdapter(Context ctx) {
this.mCtx = ctx;
}
public MonDBAdapter open() throws SQLException {
this.mDbHelper = new DatabaseHelper(this.mCtx);
this.mDb = this.mDbHelper.getWritableDatabase();
return this;
}
public void close() {
this.mDbHelper.close();
}
public long createEntry(String lesson, String location, String tutor , String notes){
ContentValues initialValues = new ContentValues();
initialValues.put(LESSON, lesson);
initialValues.put(LOCATION, location);
initialValues.put(TUTOR, tutor);
initialValues.put(NOTES, notes);
return this.mDb.insert(MONDAY, null, initialValues);
}
public boolean deleteEntry(long rowId) {
return this.mDb.delete(MONDAY, ROW_ID + "=" + rowId, null) > 0; //$NON-NLS-1$
}
public Cursor getAllEntries() {
return this.mDb.query(MONDAY, new String[] { ROW_ID,
LESSON, LOCATION, TUTOR, NOTES }, null, null, null, null, null);
}
public Cursor getEntry(long rowId) throws SQLException {
Cursor mCursor =
this.mDb.query(true, MONDAY, new String[] { ROW_ID, LESSON,
LOCATION, TUTOR, NOTES}, ROW_ID + "=" + rowId, null, null, null, null, null);
if (mCursor != null) {
mCursor.moveToFirst();
}
return mCursor;
}
public boolean updateEntry(long rowId, String lesson, String location,
String tutor, String notes){
ContentValues args = new ContentValues();
args.put(LESSON, lesson);
args.put(LOCATION, location);
args.put(TUTOR, tutor);
args.put(NOTES, notes);
return this.mDb.update(MONDAY, args, ROW_ID + "=" + rowId, null) >0;
}
私はlogcatになって何が：
ERROR/AndroidRuntime(2464): FATAL EXCEPTION: main
ERROR/AndroidRuntime(2464): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.scotty65/com.scotty65.TabBarExample}: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.scotty65/com.scotty65.Monday}: android.database.CursorIndexOutOfBoundsException: Index 0 requested, with a size of 0
ERROR/AndroidRuntime(2464): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1768)
ERROR/AndroidRuntime(2464): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1784)
ERROR/AndroidRuntime(2464): at android.app.ActivityThread.access$1500(ActivityThread.java:123)
ERROR/AndroidRuntime(2464): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:939)
ERROR/AndroidRuntime(2464): at android.os.Handler.dispatchMessage(Handler.java:99)
ERROR/AndroidRuntime(2464): at android.os.Looper.loop(Looper.java:123)
ERROR/AndroidRuntime(2464): at android.app.ActivityThread.main(ActivityThread.java:3835)
ERROR/AndroidRuntime(2464): at java.lang.reflect.Method.invokeNative(Native Method)
ERROR/AndroidRuntime(2464): at java.lang.reflect.Method.invoke(Method.java:507)
ERROR/AndroidRuntime(2464): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)
ERROR/AndroidRuntime(2464): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
/AndroidRuntime(2464): at dalvik.system.NativeStart.main(Native Method)
ERROR/AndroidRuntime(2464): Caused by: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.scotty65/com.scotty65.Monday}: android.database.CursorIndexOutOfBoundsException: Index 0 requested, with a size of 0
ERROR/AndroidRuntime(2464): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1768)
ERROR/AndroidRuntime(2464): at android.app.ActivityThread.startActivityNow(ActivityThread.java:1598)
ERROR/AndroidRuntime(2464): at android.app.LocalActivityManager.moveToState(LocalActivityManager.java:127)
ERROR/AndroidRuntime(2464): at android.app.LocalActivityManager.startActivity(LocalActivityManager.java:339)
どのラインが例外を投げていますか？ – Cristian