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Android app crashes when I call mAdaper.notifyDataSetChanged();
This is an app thats supposed to get the contacts from the phone and list the ones that have a phone number in a listview.
But the app crashes when mAdaper.notifyDataSetChanged(); is called :/
please help.
public class MainActivity extends Activity{
static int num = 0;
ListView lv;
ArrayAdapter<String> mAdaper;
ArrayList<String> contacts = new ArrayList<String>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
getContacts();
lv = (ListView)findViewById(R.id.listView1);
mAdaper = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, contacts);
lv.setAdapter(mAdaper);
}
private void getContacts(){
ContentResolver cr = getContentResolver();
Cursor cur = cr.query(ContactsContract.Contacts.CONTENT_URI, null, // projection,
null, // selection,
null, // selectionArgs,
"_ID DESC" // sortOrder
);
if (cur.getCount() > 0) {
while (cur.moveToNext() && num < 10) {
String id = cur.getString(cur
.getColumnIndex(ContactsContract.Contacts._ID));
String name = cur
.getString(cur
.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));
if (Integer
.parseInt(cur.getString(cur
.getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER))) > 0) {
// TableRow row = new TableRow(this);
TextView tv = new TextView(this);
String row = id + " - " + name;
contacts.add(row);
//mAdaper.add(row);
num++;
}
}
}
mAdaper.notifyDataSetChanged();
}
android asked May 8 '13 at 0:16
SiavashSiavash
4,54973455
add a comment |
This is an app thats supposed to get the contacts from the phone and list the ones that have a phone number in a listview.
But the app crashes when mAdaper.notifyDataSetChanged(); is called :/
please help.
public class MainActivity extends Activity{
static int num = 0;
ListView lv;
ArrayAdapter<String> mAdaper;
ArrayList<String> contacts = new ArrayList<String>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
getContacts();
lv = (ListView)findViewById(R.id.listView1);
mAdaper = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, contacts);
lv.setAdapter(mAdaper);
}
private void getContacts(){
ContentResolver cr = getContentResolver();
Cursor cur = cr.query(ContactsContract.Contacts.CONTENT_URI, null, // projection,
null, // selection,
null, // selectionArgs,
"_ID DESC" // sortOrder
);
if (cur.getCount() > 0) {
while (cur.moveToNext() && num < 10) {
String id = cur.getString(cur
.getColumnIndex(ContactsContract.Contacts._ID));
String name = cur
.getString(cur
.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));
if (Integer
.parseInt(cur.getString(cur
.getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER))) > 0) {
// TableRow row = new TableRow(this);
TextView tv = new TextView(this);
String row = id + " - " + name;
contacts.add(row);
//mAdaper.add(row);
num++;
}
}
}
mAdaper.notifyDataSetChanged();
}
asked May 8 '13 at 0:16
SiavashSiavash
4,54973455
add a comment |
This is an app thats supposed to get the contacts from the phone and list the ones that have a phone number in a listview.
But the app crashes when mAdaper.notifyDataSetChanged(); is called :/
please help.
public class MainActivity extends Activity{
static int num = 0;
ListView lv;
ArrayAdapter<String> mAdaper;
ArrayList<String> contacts = new ArrayList<String>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
getContacts();
lv = (ListView)findViewById(R.id.listView1);
mAdaper = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, contacts);
lv.setAdapter(mAdaper);
}
private void getContacts(){
ContentResolver cr = getContentResolver();
Cursor cur = cr.query(ContactsContract.Contacts.CONTENT_URI, null, // projection,
null, // selection,
null, // selectionArgs,
"_ID DESC" // sortOrder
);
if (cur.getCount() > 0) {
while (cur.moveToNext() && num < 10) {
String id = cur.getString(cur
.getColumnIndex(ContactsContract.Contacts._ID));
String name = cur
.getString(cur
.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));
if (Integer
.parseInt(cur.getString(cur
.getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER))) > 0) {
// TableRow row = new TableRow(this);
TextView tv = new TextView(this);
String row = id + " - " + name;
contacts.add(row);
//mAdaper.add(row);
num++;
}
}
}
mAdaper.notifyDataSetChanged();
}
asked May 8 '13 at 0:16
SiavashSiavash
4,54973455
This is an app thats supposed to get the contacts from the phone and list the ones that have a phone number in a listview.
But the app crashes when mAdaper.notifyDataSetChanged(); is called :/
please help.
public class MainActivity extends Activity{
static int num = 0;
ListView lv;
ArrayAdapter<String> mAdaper;
ArrayList<String> contacts = new ArrayList<String>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
getContacts();
lv = (ListView)findViewById(R.id.listView1);
mAdaper = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, contacts);
lv.setAdapter(mAdaper);
}
private void getContacts(){
ContentResolver cr = getContentResolver();
Cursor cur = cr.query(ContactsContract.Contacts.CONTENT_URI, null, // projection,
null, // selection,
null, // selectionArgs,
"_ID DESC" // sortOrder
);
if (cur.getCount() > 0) {
while (cur.moveToNext() && num < 10) {
String id = cur.getString(cur
.getColumnIndex(ContactsContract.Contacts._ID));
String name = cur
.getString(cur
.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));
if (Integer
.parseInt(cur.getString(cur
.getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER))) > 0) {
// TableRow row = new TableRow(this);
TextView tv = new TextView(this);
String row = id + " - " + name;
contacts.add(row);
//mAdaper.add(row);
num++;
}
}
}
mAdaper.notifyDataSetChanged();
}
asked May 8 '13 at 0:16
SiavashSiavash
4,54973455
asked May 8 '13 at 0:16
SiavashSiavash
4,54973455
asked May 8 '13 at 0:16
SiavashSiavash
4,54973455
asked May 8 '13 at 0:16
SiavashSiavash
4,54973455
asked May 8 '13 at 0:16
SiavashSiavash
4,54973455
4,54973455
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
You are calling getContacts() before initializing the mAdapter. In the getContacts(), you are calling mAdapter.notifyDataSetChanged();. At this point, mAdapter is not yet initialized.
Call getContacts() after you have initialized the mAdapter.
lv = (ListView)findViewById(R.id.listView1);
mAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, contacts);
lv.setAdapter(mAdapter);
getContacts();
answered May 8 '13 at 0:18
Aswin RajendiranAswin Rajendiran
3,14211617
add a comment |
I've done this (I think it's very dirty) by calling onCreate(null) after changing data-sets. This restores my Recycler perfectly:
This crashes:
// delete selected items from database
sqLiteDatabase.execSQL("DELETE FROM country WHERE selected");
cursor = getDBContent();
cursor.close();
mainActivityAdapter.notifyDataSetChanged();
This not:
// delete selected items from database
sqLiteDatabase.execSQL("DELETE FROM country WHERE selected");
cursor = getDBContent();
cursor.close();
this.onCreate(null);
I did a System.out.println() and wether the cursor nor the mainActivityAdapter has been "null". But in my example, the index of the cursor seems to be the couse of the crashing, even that I restored it. But I don't mind, as long as the above is working and running stable (maybe it is inefficient).
answered Jan 1 at 16:16
MartinMartin
1691211
add a comment |
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2 Answers
2
active
oldest
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2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
You are calling getContacts() before initializing the mAdapter. In the getContacts(), you are calling mAdapter.notifyDataSetChanged();. At this point, mAdapter is not yet initialized.
Call getContacts() after you have initialized the mAdapter.
lv = (ListView)findViewById(R.id.listView1);
mAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, contacts);
lv.setAdapter(mAdapter);
getContacts();
answered May 8 '13 at 0:18
Aswin RajendiranAswin Rajendiran
3,14211617
add a comment |
You are calling getContacts() before initializing the mAdapter. In the getContacts(), you are calling mAdapter.notifyDataSetChanged();. At this point, mAdapter is not yet initialized.
Call getContacts() after you have initialized the mAdapter.
lv = (ListView)findViewById(R.id.listView1);
mAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, contacts);
lv.setAdapter(mAdapter);
getContacts();
answered May 8 '13 at 0:18
Aswin RajendiranAswin Rajendiran
3,14211617
add a comment |
You are calling getContacts() before initializing the mAdapter. In the getContacts(), you are calling mAdapter.notifyDataSetChanged();. At this point, mAdapter is not yet initialized.
Call getContacts() after you have initialized the mAdapter.
lv = (ListView)findViewById(R.id.listView1);
mAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, contacts);
lv.setAdapter(mAdapter);
getContacts();
answered May 8 '13 at 0:18
Aswin RajendiranAswin Rajendiran
3,14211617
You are calling getContacts() before initializing the mAdapter. In the getContacts(), you are calling mAdapter.notifyDataSetChanged();. At this point, mAdapter is not yet initialized.
Call getContacts() after you have initialized the mAdapter.
lv = (ListView)findViewById(R.id.listView1);
mAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, contacts);
lv.setAdapter(mAdapter);
getContacts();
answered May 8 '13 at 0:18
Aswin RajendiranAswin Rajendiran
3,14211617
answered May 8 '13 at 0:18
Aswin RajendiranAswin Rajendiran
3,14211617
answered May 8 '13 at 0:18
Aswin RajendiranAswin Rajendiran
3,14211617
answered May 8 '13 at 0:18
Aswin RajendiranAswin Rajendiran
3,14211617
3,14211617
add a comment |
add a comment |
I've done this (I think it's very dirty) by calling onCreate(null) after changing data-sets. This restores my Recycler perfectly:
This crashes:
// delete selected items from database
sqLiteDatabase.execSQL("DELETE FROM country WHERE selected");
cursor = getDBContent();
cursor.close();
mainActivityAdapter.notifyDataSetChanged();
This not:
// delete selected items from database
sqLiteDatabase.execSQL("DELETE FROM country WHERE selected");
cursor = getDBContent();
cursor.close();
this.onCreate(null);
I did a System.out.println() and wether the cursor nor the mainActivityAdapter has been "null". But in my example, the index of the cursor seems to be the couse of the crashing, even that I restored it. But I don't mind, as long as the above is working and running stable (maybe it is inefficient).
answered Jan 1 at 16:16
MartinMartin
1691211
add a comment |
I've done this (I think it's very dirty) by calling onCreate(null) after changing data-sets. This restores my Recycler perfectly:
This crashes:
// delete selected items from database
sqLiteDatabase.execSQL("DELETE FROM country WHERE selected");
cursor = getDBContent();
cursor.close();
mainActivityAdapter.notifyDataSetChanged();
This not:
// delete selected items from database
sqLiteDatabase.execSQL("DELETE FROM country WHERE selected");
cursor = getDBContent();
cursor.close();
this.onCreate(null);
I did a System.out.println() and wether the cursor nor the mainActivityAdapter has been "null". But in my example, the index of the cursor seems to be the couse of the crashing, even that I restored it. But I don't mind, as long as the above is working and running stable (maybe it is inefficient).
answered Jan 1 at 16:16
MartinMartin
1691211
add a comment |
I've done this (I think it's very dirty) by calling onCreate(null) after changing data-sets. This restores my Recycler perfectly:
This crashes:
// delete selected items from database
sqLiteDatabase.execSQL("DELETE FROM country WHERE selected");
cursor = getDBContent();
cursor.close();
mainActivityAdapter.notifyDataSetChanged();
This not:
// delete selected items from database
sqLiteDatabase.execSQL("DELETE FROM country WHERE selected");
cursor = getDBContent();
cursor.close();
this.onCreate(null);
I did a System.out.println() and wether the cursor nor the mainActivityAdapter has been "null". But in my example, the index of the cursor seems to be the couse of the crashing, even that I restored it. But I don't mind, as long as the above is working and running stable (maybe it is inefficient).
answered Jan 1 at 16:16
MartinMartin
1691211
I've done this (I think it's very dirty) by calling onCreate(null) after changing data-sets. This restores my Recycler perfectly:
This crashes:
// delete selected items from database
sqLiteDatabase.execSQL("DELETE FROM country WHERE selected");
cursor = getDBContent();
cursor.close();
mainActivityAdapter.notifyDataSetChanged();
This not:
// delete selected items from database
sqLiteDatabase.execSQL("DELETE FROM country WHERE selected");
cursor = getDBContent();
cursor.close();
this.onCreate(null);
I did a System.out.println() and wether the cursor nor the mainActivityAdapter has been "null". But in my example, the index of the cursor seems to be the couse of the crashing, even that I restored it. But I don't mind, as long as the above is working and running stable (maybe it is inefficient).
answered Jan 1 at 16:16
MartinMartin
1691211
answered Jan 1 at 16:16
MartinMartin
1691211
answered Jan 1 at 16:16
MartinMartin
1691211
answered Jan 1 at 16:16
MartinMartin
1691211
1691211
add a comment |
add a comment |
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