我有一个排除日期的问题，只有当它不是我的ArrayList中第一个元素的最后一个元素时才会出现。
Why does this happen and how to solve?
Example:
| ID |
:
Gil <- problem deleting this line
Rui <- problem deleting this line
Ana <- no problem
我正在实施此网站的示例： http://www.tutorialspoint.com/android/android_sqlite_database.htm
错误：引起：android.database.CursorIndexOutOfBoundsException：请求索引0，大小为0
代码
public Integer deleteContact (Integer id, ArrayList<Integer> array_List)
{
SQLiteDatabase db = this.getWritableDatabase();
db.delete("contacts", "id = ? ", new String[]{Integer.toString(id)});
db.close();
return id;
}
public ArrayList<String> getAllCotacts()
{
ArrayList<String> array_list = new ArrayList<String>();
//hp = new HashMap();
SQLiteDatabase db = this.getReadableDatabase();
Cursor res = db.rawQuery( "select * from contacts", null );
res.moveToFirst();
while(res.isAfterLast() == false){
array_list.add(res.getString(res.getColumnIndex(CONTACTS_COLUMN_NAME)));
res.moveToNext();
}
return array_list;
}
public Cursor getData(int id){
SQLiteDatabase db = this.getReadableDatabase();
Cursor res = db.rawQuery( "select * from contacts where id="+id+"", null );
return res;
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_display_contact);
name = (TextView) findViewById(R.id.editTextName);
phone = (TextView) findViewById(R.id.editTextPhone);
email = (TextView) findViewById(R.id.editTextStreet);
street = (TextView) findViewById(R.id.editTextEmail);
place = (TextView) findViewById(R.id.editTextCity);
mydb = new DBHelper(this);
Bundle extras = getIntent().getExtras();
if(extras !=null)
{
int Value = extras.getInt("id");
if(Value>0){
//means this is the view part not the add contact part.
Cursor rs = mydb.getData(Value);
id_To_Update = Value;
if ( rs.moveToFirst()) {
do {
if (rs != null && rs.getCount()!= 0 ){
id_To_Update = Value;
String nam = rs.getString(rs.getColumnIndex(DBHelper.CONTACTS_COLUMN_NAME));
String phon=rs.getString(rs.getColumnIndex(DBHelper.CONTACTS_COLUMN_PHONE));
String emai=rs.getString(rs.getColumnIndex(DBHelper.CONTACTS_COLUMN_EMAIL));
String Stree=rs.getString(rs.getColumnIndex(DBHelper.CONTACTS_COLUMN_STREET));
String plac = rs.getString(rs.getColumnIndex(DBHelper.CONTACTS_COLUMN_CITY));
Button b = (Button) findViewById(R.id.button1);
b.setVisibility(View.INVISIBLE);
name.setText((CharSequence) nam);
name.setFocusable(false);
name.setClickable(false);
phone.setText((CharSequence) phon);
phone.setFocusable(false);
phone.setClickable(false);
email.setText((CharSequence) emai);
email.setFocusable(false);
email.setClickable(false);
street.setText((CharSequence) stree);
street.setFocusable(false);
street.setClickable(false);
place.setText((CharSequence) plac);
place.setFocusable(false);
place.setClickable(false);
}
} while (rs.moveToNext());
if (!rs.isClosed()) {
rs.close();
}
}
if (!rs.isClosed()) {
rs.close();
}
}
}
}
public boolean onOptionsItemSelected(MenuItem item)
{
super.onOptionsItemSelected(item);
switch(item.getItemId())
{
case R.id.Edit_Contact:
Button b = (Button)findViewById(R.id.button1);
b.setVisibility(View.VISIBLE);
name.setEnabled(true);
name.setFocusableInTouchMode(true);
name.setClickable(true);
phone.setEnabled(true);
phone.setFocusableInTouchMode(true);
phone.setClickable(true);
email.setEnabled(true);
email.setFocusableInTouchMode(true);
email.setClickable(true);
street.setEnabled(true);
street.setFocusableInTouchMode(true);
street.setClickable(true);
place.setEnabled(true);
place.setFocusableInTouchMode(true);
place.setClickable(true);
return true;
case R.id.Delete_Contact:
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage(R.string.deleteContact)
.setPositiveButton(R.string.yes, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
mydb.deleteContact(id_To_Update);
Toast.makeText(getApplicationContext(), "Deleted Successfully", Toast.LENGTH_SHORT).show();
Intent intent = new Intent(getApplicationContext(),MainActivity.class);
startActivity(intent);
}
})
.setNegativeButton(R.string.no, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// User cancelled the dialog
}
});
AlertDialog d = builder.create();
d.setTitle("Are you sure");
d.show();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
public boolean onOptionsItemSelected(MenuItem item)
{
super.onOptionsItemSelected(item);
switch(item.getItemId())
{
case R.id.Edit_Contact:
Button b = (Button)findViewById(R.id.button1);
b.setVisibility(View.VISIBLE);
name.setEnabled(true);
name.setFocusableInTouchMode(true);
name.setClickable(true);
phone.setEnabled(true);
phone.setFocusableInTouchMode(true);
phone.setClickable(true);
email.setEnabled(true);
email.setFocusableInTouchMode(true);
email.setClickable(true);
street.setEnabled(true);
street.setFocusableInTouchMode(true);
street.setClickable(true);
place.setEnabled(true);
place.setFocusableInTouchMode(true);
place.setClickable(true);
return true;
case R.id.Delete_Contact:
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage(R.string.deleteContact)
.setPositiveButton(R.string.yes, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
mydb.deleteContact(id_To_Update);
Toast.makeText(getApplicationContext(), "Deleted Successfully", Toast.LENGTH_SHORT).show();
Intent intent = new Intent(getApplicationContext(),MainActivity.class);
startActivity(intent);
}
})
.setNegativeButton(R.string.no, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// User cancelled the dialog
}
});
AlertDialog d = builder.create();
d.setTitle("Are you sure");
d.show();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
public Integer deleteContact (Integer id)
{
SQLiteDatabase db = this.getWritableDatabase();
return db.delete("contacts",
"id = ? ",
new String[] { Integer.toString(id) });
}
错误导致我开始这一行：
String nam = rs.getString(rs.getColumnIndex(DBHelper.CONTACTS_COLUMN_NAME));
答案 0 :(得分：0)
你应该检查rs.moveToFist（）是否返回false。
如果为false，则表示光标为空，因此当您尝试获取该值时，您将获得android.database.CursorIndexOutOfBoundsException。
你的getData（int）返回一个空光标，因为没有你给他的id的记录。
删除arrayList中的数据：
array_list.add(res.getString(res.getColumnIndex(CONTACTS_COLUMN_NAME)));
通过：
int idContacts =res.getInt(res.getColumnIndex(CONTACTS_ID));
array_list.add(idContacts, res.getString(res.getColumnIndex(CONTACTS_COLUMN_NAME)));
然后，当您想删除联系人时使用：
array_list.remove(idDelete);