I have an adapter that extends simplecursoradapter. The new view is supposed to take a cursor from a database along with an image, populate a list with a couple of checkboxes. For some reason I can't seem to see, my getView is not even being called. I have a breakpoint inside getView and it never gets there and the list just shows up empty.
Can anyone take a look thru and see what I've done wrong
public class TakeStudentAttendance extends ListActivity {
private gradeBookDbAdapter mDbHelper;
private Long mRowId;
private TextView mNameText;
private String classname;
private Boolean new_attendance = false;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Cursor stud;
mDbHelper = new gradeBookDbAdapter(this);
mDbHelper.open();
mRowId = (savedInstanceState == null) ? null
: (Long) savedInstanceState
.getSerializable(gradeBookDbAdapter.KEY_ROWID);
if (mRowId == null) {
Bundle extras = getIntent().getExtras();
mRowId = extras != null ? extras
.getLong(gradeBookDbAdapter.KEY_ROWID) : null;
}
// pull in class data
stud = mDbHelper.fetchClass(mRowId);
startManagingCursor(stud);
classname = stud.getString(
stud.getColumnIndexOrThrow(gradeBookDbAdapter.KEY_CLASSNAME));
String title = "Attendance for " + classname;
setTitle(title);
setContentView(R.layout.attendance_list);
Button doneButton = (Button) findViewById(R.id.Done);
doneButton.setOnClickListener(mAttendanceActivity);
// check previous attendance date
String prevdate = stud.getString(
stud.getColumnIndexOrThrow(gradeBookDbAdapter.KEY_PREVDATE));
stud = mDbHelper.fetchAttendanceByClass(mRowId); // this query yields _id, name,
// attend, late, dtime
if (mDbHelper.getClassDate() == prevdate){
// previous date is the same, so we're doing attendance again: retain values
new_attendance = false;
}
else {
// dates are different, so we're starting from scratch and all students are
// absent until counted present. I just need names and will populate attendance
new_attendance = true;
// upon attendance start-up, NO ONE is present. Set all entries in DB to not present (0)
setNoAttend(stud, mRowId);
// reset cursor position
stud.moveToFirst();
}
// Create an array to specify the fields we want to display in the list
String[] from = new String[]{gradeBookDbAdapter.KEY_NAME,
gradeBookDbAdapter.KEY_ROWID,
gradeBookDbAdapter.KEY_ATTEND,
gradeBookDbAdapter.KEY_LATE,
gradeBookDbAdapter.KEY_DTIME};
// and an array of the fields we want to bind those fields to (in this case just text1)
int[] to = new int[]{R.id.stuname,
R.id.stuIndex,
R.id.attend,
R.id.late,
R.id.stuIndex};
// Now create a simple cursor adapter and set it to display
// mRowId holds the class index.
MyDataAdapter studs =
new MyDataAdapter(this, R.layout.show_attendance, stud, from, to, mRowId, new_attendance);
setListAdapter(studs);
}
Here's my adapter code:
public class MyDataAdapter extends SimpleCursorAdapter {
private Cursor c;
private Context context;
private Long classnum;
private gradeBookDbAdapter mDbHelper;
private Boolean newValues;
private ArrayList<String> list = new ArrayList<String>();
private ArrayList<Boolean> itemCheckedHere = new ArrayList<Boolean>();
private ArrayList<Boolean> itemCheckedLate = new ArrayList<Boolean>();
private ArrayList<Integer> itemCheckedIdx = new ArrayList<Integer>();
int idxCol;
int idx;
// itemChecked will store the position of the checked items.
public MyDataAdapter(Context context, int layout, Cursor c, String[] from,
int[] to, Long mRowId, Boolean new_attendance) {
super(context, layout, c, from, to);
this.c = c;
this.context = context;
mDbHelper = new gradeBookDbAdapter(context);
mDbHelper.open();
classnum = mRowId;
newValues = new_attendance;
c.moveToFirst();
for (int i = 0; i < c.getCount(); i++) {
itemCheckedHere.add(i, false); // initializes all items value with false
itemCheckedLate.add(i, false); // initializes all items value with false
}
}
public View getView(final int pos, View inView, ViewGroup parent) {
File file;
ImageView studentPhoto;
if (inView == null) {
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
inView = inflater.inflate(R.layout.show_attendance, null);
}
// set up name field
final TextView studentName = (TextView) inView.findViewById(R.id.stuname);
final TextView studentIndex = (TextView) inView.findViewById(R.id.stuIndex);
if (studentName != null)
{
c.moveToPosition(pos);
int index = c.getColumnIndex(gradeBookDbAdapter.KEY_NAME);
String name = c.getString(index);
studentName.setText(name);
index = c.getColumnIndex(gradeBookDbAdapter.KEY_STUDENT);
String Index = c.getString(index);
studentIndex.setText(Index);
// set up photo icon
file = new File(Environment.getExternalStorageDirectory () +
"/gradeBook/" + name + ".jpg");
studentPhoto = (ImageView) inView.findViewById(R.id.icon);
if (file.exists()) {
String fileName = file.getAbsolutePath();
BitmapFactory.Options opts = new BitmapFactory.Options();
Bitmap bm;
bm = BitmapFactory.decodeFile(fileName, opts);
studentPhoto.setImageBitmap(bm);
}
else {
// use icon image
studentPhoto.setImageResource(R.drawable.person_icon);
}
}
final CheckBox cBoxH = (CheckBox) inView.findViewById(R.id.attend);
final CheckBox cBoxL = (CheckBox) inView.findViewById(R.id.late);
cBoxH.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
CheckBox cb = (CheckBox) v.findViewById(R.id.attend);
if (cb.isChecked()) {
itemCheckedHere.set(pos, true);
int Index = new Integer(studentIndex.getText().toString());
mDbHelper.insertAttend(Index, classnum, 1 );
} else if (!cb.isChecked()) {
itemCheckedHere.set(pos, false);
int Index = new Integer(studentIndex.getText().toString());
mDbHelper.deleteAttend(Index, classnum );
}
}
});
cBoxL.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
CheckBox cb = (CheckBox) v.findViewById(R.id.late);
if (cb.isChecked()) {
itemCheckedLate.set(pos, true);
// do some operations here
} else if (!cb.isChecked()) {
itemCheckedLate.set(pos, false);
// do some operations here
}
}
});
cBoxH.setChecked(itemCheckedHere.get(pos)); // this will Check or Uncheck the
cBoxL.setChecked(itemCheckedLate.get(pos)); // this will Check or Uncheck the
// CheckBox in ListView
// according to their original
// position and CheckBox never
// loss his State when you
// Scroll the List Items.
return inView;
}
}
This got answered in the comment, but it might as well get a real answer ^^
getCount() is actually returning 0, so the problem is in the query coming back empty, and not in the adapter.
There can be another reason, why getView is never called. In my case I had two elements in LinearLayout - TextView and ListView. The attribute layout_height of TextView was set to fill_parent and ListView element was out of screen bounds because of this. As getView method is called only when ListView item becomes visible to user, so it has never been called. Changing layout_height property to wrap_content solved this problem.
Another thing is to make sure you have called setContentView() with the appropriate argument.
Related
I have a custom listView built with ArrayAdapter. In ListView each item contents a TextView and a RadioGroup (with 4 RadioButton). I can choose one RadioButton to be selected for each list item. On the bottom of ListView i have a footer with button. What i want is to get all data when i click on button like this:
name1 - 1
name2 - 3
name3 - 2
name4 - 3
...
First column - Text from TextView
Second column - Tag of selected RadioButton
Atcivity with view:
public class MarksAdd extends ListActivity {
ArrayList<String> itemlist = new ArrayList<String>();
private Context context = null;
private ListView listView;
private Button BtnDone;
#Override
public void onCreate(Bundle saveInstanceState) {
super.onCreate(saveInstanceState);
setContentView(R.layout.marks_add);
Intent intent = getIntent();
int day = intent.getIntExtra("day", 0);
int month = intent.getIntExtra("month", 0);
int year = intent.getIntExtra("year", 0);
String dayStr = String.valueOf(day);
String monthStr = String.valueOf(month);
String yearStr = String.valueOf(year);
if (day != 0) {
if(dayStr.length()==1){
dayStr = "0"+dayStr;
}
if(monthStr.length()==1){
monthStr = "0"+monthStr;
}
yearStr = yearStr.substring(2);
String date = dayStr+"."+monthStr+"."+yearStr;
Toast.makeText(this, date, Toast.LENGTH_SHORT).show();
}
final ArrayAdapter<Model> adapter = new InteractiveArrayAdapter(this,
getModel());
listView = getListView();
LayoutInflater inflater = getLayoutInflater();
listView.addFooterView(inflater.inflate(R.layout.list_footer, null), null, false);
setListAdapter(adapter);
BtnDone = (Button) findViewById(R.id.markListBtn);
BtnDone.setOnClickListener( new View.OnClickListener() {
#Override
public void onClick(View v) {
//get Values ?????
}
});
}
private List<Model> getModel() {
List<Model> list = new ArrayList<Model>();
dbHelper sql = new dbHelper(this);
SQLiteDatabase db = sql.getWritableDatabase();
Cursor cursor = db.query(
PreferenceManager.getDefaultSharedPreferences(getBaseContext()).getString("group", ""), new String[]{
"Id", "Name"},
null, // The columns for the WHERE clause
null, // The values for the WHERE clause
null, // don't group the rows
null, // don't filter by row groups
"Name ASC" // The sort order
);
while (cursor.moveToNext()) {
// GET COLUMN INDICES + VALUES OF THOSE COLUMNS
int id = cursor.getInt(cursor.getColumnIndex("Id"));
String name = cursor.getString(cursor
.getColumnIndex("Name"));
list.add(get(name));
}
cursor.close();
// Initially select one of the items
return list;
}
private Model get(String question) {
return new Model(question);
}
}
ArrayAdapter:
public class InteractiveArrayAdapter extends ArrayAdapter<Model> {
private final List<Model> list;
private final Activity context;
public InteractiveArrayAdapter(Activity context, List<Model> list) {
super(context, R.layout.simple_list_item1_marks, list);
this.context = context;
this.list = list;
}
class ViewHolder {
TextView t = null;
RadioGroup group;
ViewHolder(View v) {
t = (TextView) v.findViewById(R.id.personName);
group = (RadioGroup) v.findViewById(R.id.myRgroup);
}
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View v = convertView;
ViewHolder holder = null;
if (v == null) {
LayoutInflater inflater = context.getLayoutInflater();
v = inflater.inflate(R.layout.simple_list_item1_marks, parent, false);
holder = new ViewHolder(v);
v.setTag(holder);
final View finalV = v;
holder.group
.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
public void onCheckedChanged(RadioGroup group,
int checkedId) {
Integer pos = (Integer) group.getTag(); // To identify the Model object i get from the RadioGroup with getTag()
// an integer representing the actual position
Model element = list.get(pos);
switch (checkedId) { //set the Model to hold the answer the user picked
case R.id.rb1:
element.current = Model.ANSWER_ONE_SELECTED;
break;
case R.id.rb2:
element.current = Model.ANSWER_TWO_SELECTED;
break;
case R.id.rb3:
element.current = Model.ANSWER_THREE_SELECTED;
break;
case R.id.rb4:
element.current = Model.ANSWER_FOUR_SELECTED;
break;
default:
element.current = Model.NONE; // Something was wrong set to the default
}
}
});
} else {
holder = (ViewHolder) v.getTag();
}
holder.group.setTag(position); // I passed the current position as a tag
holder.t.setText(list.get(position).question); // Set the question body
if (list.get(position).current != Model.NONE) {
RadioButton r = (RadioButton) holder.group.getChildAt(list
.get(position).current);
r.setChecked(true);
} else {
holder.group.clearCheck(); // This is required because although the Model could have the current
// position to NONE you could be dealing with a previous row where
// the user already picked an answer.
}
return v;
}
}
Model:
public class Model {
String question; // hold the question
int current = NONE; // hold the answer picked by the user, initial is NONE(see below)
public static final int NONE = 1000; // No answer selected
public static final int ANSWER_ONE_SELECTED = 0; // first answer selected
public static final int ANSWER_TWO_SELECTED = 1; // second answer selected
public static final int ANSWER_THREE_SELECTED = 2; // third answer selected
public static final int ANSWER_FOUR_SELECTED = 3; // forth answer selected
public Model(String question) {
this.question = question;
}
}
I was doing this according to that tutorial with some changes. Actualy i'm realy newbie in development, so im asking you to help me. Sorry if my question is not correct, my english is not realy good.
Well be very thankfull for any help here.
The first thought would be to iterate over the ListView and get the checked button in each row. This won't actually work because ListView does not contain all of its children all of the time.
Instead, you should store the checked item when the user actually makes a selection. Then when you press the button, you already have all the data stored and don't have to iterate over the ListView. Also, having the current selections saved this way will be useful if you scroll back up the list because you can set the current checked radio button for previous items in getView().
Let's assume the row layout has this in it:
<RadioGroup android:id="#+id/radio_group" ... >
<RadioButton android:id="#+id/radio_button_1" ... />
<RadioButton android:id="#+id/radio_button_2" ... />
<RadioButton android:id="#+id/radio_button_3" ... />
<RadioButton android:id="#+id/radio_button_4" ... />
</RadioGroup>
In your adapter's getView(), give the RadioGroup an OnCheckedChangedListener defined in the adapter itself (so you have one OnCheckedChangedListener instead of one per row). Tag the RadioGroup with the position of the list item so that you can differentiate it in the callback.
#Override
public View getView(int position, View convertView, ViewGroup parent) {
...
Model model = getItem(position);
int checkedId = ... //figure out checked id from model
viewHolder.group.check(checkedId);
viewHolder.group.setTag(position);
viewHolder.group.setOnCheckedChangedListener(checkChangedListener);
...
}
private OnCheckedChangedListener checkChangedListener = new OnCheckedChangedListener() {
#Override
public void onCheckChanged(RadioGroup group, int checkId) {
Object tag = group.getTag();
if (!(tag instanceof Integer)) {
// you have a bug. Fix it!
return;
}
int position = (Integer) tag;
Model model = getItem(position);
switch(checkedId) {
case R.id.radio_button_1:
model.setCurrent(Model.ANSWER_ONE_SELECTED); break;
case R.id.radio_button_1:
model.setCurrent(Model.ANSWER_TWO_SELECTED); break;
case R.id.radio_button_1:
model.setCurrent(Model.ANSWER_THREE_SELECTED); break;
case R.id.radio_button_1:
model.setCurrent(Model.ANSWER_FOUR_SELECTED); break;
}
}
};
Now you just need to get your list of Models from the adapter.
I just want to ask something about showing data to checkbox, right now, I just have successful to showing data into checbox but, now I get trouble, when I have 1 data in my database, the checkbox show 2 data? here's my example database
Table Jurusan
id | nama
1 ipa
then I have function to read this database
public ArrayList<Jurusan> getAllLabel_jurusan()
{
ArrayList <Jurusan> point = new ArrayList<Jurusan>();
String selectQuery = "SELECT id, nama_jurusan from jurusan";
Cursor c = database.rawQuery(selectQuery, null);
if( c.moveToFirst() );
do
{
Jurusan j = new Jurusan();
j.setId(c.getLong(0));
j.setNama_jurusan(c.getString(1));
// adding to todo list
point.add(j);
}
while(c.moveToNext());
return point;
}
and this is my MainActivity
public class MainActivity extends Activity implements OnItemSelectedListener
{
Button myButton;
String tmp_nama;
long id_tampung;
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
myButton = (Button) findViewById(R.id.findSelected);
displayListView();
checkButtonClick();
}
private void displayListView()
{
ArrayList<Jurusan> stateList = dataSource.getAllLabel_jurusan();
//GETTING THE DATA FROM DATABASE
id_tampung = stateList.get(0).getId();
tmp_nama = stateList.get(0).getNama_jurusan().toString();
//THE SET INTO CONSTRUCTOR
Jurusan _states = new Jurusan(id_tampung, tmp_nama);
//ADD TO ARRAY
stateList.add(_states);
// create an ArrayAdaptar from the String Array
//SETTING INTO CustomAdapter
dataAdapter = new MyCustomAdapter(this, R.layout.state_info,stateList);
ListView listView = (ListView) findViewById(R.id.listView1);
// Assign adapter to ListView
listView.setAdapter(dataAdapter);
}
private class MyCustomAdapter extends ArrayAdapter<Jurusan>
{
private ArrayList<Jurusan> stateList;
public MyCustomAdapter(Context context, int textViewResourceId, ArrayList<Jurusan> stateList)
{
super(context, textViewResourceId, stateList);
this.stateList = new ArrayList<Jurusan>();
this.stateList.addAll(stateList);
}
private class ViewHolder
{
TextView id;
CheckBox name;
}
#Override
public View getView(int position, View convertView, ViewGroup parent)
{
ViewHolder holder = null;
Log.v("ConvertView", String.valueOf(position));
if (convertView == null)
{
LayoutInflater vi = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = vi.inflate(R.layout.state_info, null);
holder = new ViewHolder();
holder.id = (TextView) convertView.findViewById(R.id.code);
holder.name = (CheckBox) convertView.findViewById(R.id.checkBox1);
convertView.setTag(holder);
}
else
{
holder = (ViewHolder) convertView.getTag();
}
Jurusan state = stateList.get(position);
holder.id.setText(" (" + state.getId() + ")");
holder.name.setText(state.getNama_jurusan());
holder.name.setTag(state);
return convertView;
}
}
My question is, the checkbox should showing 1 data from database, but when i run this code, the checkbox is showing 2 data with same value, can anybody help me?
example:
checbox1 (value:ipa)
checkbox2 (value:ipa)
i hope it should be like this...
checkbox1 (value:ipa)
In your displayListView(), you're duplicating the first entry in the stateList:
ArrayList<Jurusan> stateList = dataSource.getAllLabel_jurusan();
if(stateList.size()>0)
{
//GETTING THE DATA FROM DATABASE
id_tampung = stateList.get(0).getId();
tmp_nama = stateList.get(0).getNama_jurusan().toString();
//THE SET INTO CONSTRUCTOR
Jurusan _states = new Jurusan(id_tampung, tmp_nama);
//ADD TO ARRAY
stateList.add(_states);
}
I don't know what your intention here is but you probably could just remove this if block altogether.
The problem is in your code, you are add double values in your code. i added my comment before line of code.
//statelist contains an arraylist with your required data.
ArrayList<Jurusan> stateList = dataSource.getAllLabel_jurusan();
//you are checking here for zero.
if(stateList.size()>0)
{
//GETTING THE DATA FROM DATABASE
//here you are get id;
id_tampung = stateList.get(0).getId();
//here you are get name;
tmp_nama = stateList.get(0).getNama_jurusan().toString();
//THE SET INTO CONSTRUCTOR
//making an object of jurusan
Jurusan _states = new Jurusan(id_tampung, tmp_nama);
//ADD TO ARRAY
// and adding again the same arraylist. so that cause duplication.
//stateList already contained the data , which are you add this line.
stateList.add(_states);
}
yes , please replace the function displayListView as below.
private void displayListView()
{
ArrayList<Jurusan> stateList = dataSource.getAllLabel_jurusan();
/*
//GETTING THE DATA FROM DATABASE
id_tampung = stateList.get(0).getId();
tmp_nama = stateList.get(0).getNama_jurusan().toString();
//THE SET INTO CONSTRUCTOR
Jurusan _states = new Jurusan(id_tampung, tmp_nama);
//ADD TO ARRAY
stateList.add(_states);*/
// create an ArrayAdaptar from the String Array
//SETTING INTO CustomAdapter
dataAdapter = new MyCustomAdapter(this, R.layout.state_info,stateList);
ListView listView = (ListView) findViewById(R.id.listView1);
// Assign adapter to ListView
listView.setAdapter(dataAdapter);
}
Here is my first question on StackOverFlow, I usually always find an answer by myself but I am really stuck on a weird problem that I will explain here:
I implemented a ListView in a fragment activity, this listview contains a list of categories related to the current record that I get from the SQLLite database.
All is working fine, I created a SimpleCursorAdapter to retrieve the data from the DB and I display the categories correctly in the ListView.
The problem is related to the pre-fill of the checkboxes (it is a multiselection list), depending on how I try to pre-check the checkboxes, I get 2 cases:
First, the checkboxes are well pre-checked, but I cannot toggle the checkboxes anymore by clicking them. Second the click toggle well the checkboxes, but they are not pre-checked anymore...
Here is the part of the code where I have the problem:
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
//super.onCreate(savedInstanceState);
View v = inflater.inflate(R.layout.rate_fragment, container,false);
dbCategories = "";
displayCategories = resources.getText(R.string.no_categories).toString();
/** INITIALIZATION */
mViewSwitcher = (ViewSwitcher)v.findViewById(R.id.profileSwitcher);
/** Edition view */
rateGroup = (RadioGroup)v.findViewById(R.id.rate_group);
rateOne = (RadioButton)v.findViewById(R.id.one_button);
rateOne.setTag(1);
rateTwo = (RadioButton)v.findViewById(R.id.two_button);
rateTwo.setTag(2);
rateThree = (RadioButton)v.findViewById(R.id.three_button);
rateThree.setTag(3);
rateFour = (RadioButton)v.findViewById(R.id.four_button);
rateFour.setTag(4);
rateFive = (RadioButton)v.findViewById(R.id.five_button);
rateFive.setTag(5);
descET = (EditText)v.findViewById(R.id.editdescription);
descTextSize = descET.getTextSize();
descET.addTextChangedListener(new TextWatcher() {
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
#Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
#Override
public void afterTextChanged(Editable s) {
}
});
categoriesTV_edit = (TextView)v.findViewById(R.id.edit_categories);
categoriesBT = (Button) v.findViewById(R.id.select_categories);
categoriesBT.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
View categoriesListTitle = getActivity().getLayoutInflater().inflate(R.layout.category_list_title, null);
AlertDialog.Builder alt_bld = new AlertDialog.Builder(v.getContext()).setCustomTitle(categoriesListTitle);
categories = db.getAllCategoriesByRate(currentRate);
categoriesList = new ListView(getActivity());
categoriesList.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
categoriesList.setClickable(true);
String[] fromColumns = new String[] {
DatabaseHandler.CATEGORY_NAME
};
int[] toViews = new int[]{
R.id.cat_checked
};
//mAdapter = new SimpleCursorAdapter(getActivity(), android.R.layout.simple_list_item_multiple_choice, categories, fromColumns, toViews, 0);
mAdapter = new SimpleCursorAdapter(getActivity(), R.layout.category_item, categories, fromColumns, toViews, 0);
mAdapter.setViewBinder(new ViewBinder() {
public boolean setViewValue(View view, Cursor cursor, int columnIndex) {
if (columnIndex == 1) {
CheckedTextView categRow = (CheckedTextView) view;
String catName = cursor.getString(1);
mAdapter.setViewText((TextView) view, catName);
int catChecked = cursor.getInt(2);
//boolean checkedCat = catChecked==1;
//categoriesList.setItemChecked(cursor.getPosition(),checkedCat);
categRow.setChecked(catChecked==1);
int catID = cursor.getInt(0);
categRow.setTag(catID);
return true;
}
else {
return false;
}
}
});
categoriesList.setAdapter(mAdapter);
alt_bld.setView(categoriesList);
To have one case or another, all depends on these 2 lines:
//boolean checkedCat = catChecked==1;
//categoriesList.setItemChecked(cursor.getPosition(),checkedCat);
If they are commented, the checkboxes are not pre-checked, but the toggle on the clicks is working. But if I comment these lines out, the toggle is not working anymore but the categories are prechecked.
What I also don't understand is that this line is not working:
categRow.setChecked(catChecked==1);
But this one is working well (I succeed to retrieve the tag):
categRow.setTag(catID);
So I hope someone will succeed to explain to me what I do wrong, I guess there is something I misunderstood here...
NOTE: I get 3 columns from the cursor "categories", first one is the ID of the category, second one is the name, and third one is the status: checked or not (1 or 0).
Thanks in advance for your time.
Finally I ended up creating my own custom adapter, this way I could at least understand more easily what was happening.
I had to create actually several multiselect lists, some populated with data from the database, others from the shared preferences.
For this one displaying data from the DB, I created the following adapter (I commented out the lines about the icons because I did not set them up yet):
public class CategoriesLVAdapter extends BaseAdapter {
private Context mContext;
private LayoutInflater mInflater;
private List<Category> categoriesList;
// Constructor
public CategoriesLVAdapter(Context c, List<Category> categories_list){
mContext = c;
mInflater = LayoutInflater.from(c);
categoriesList = categories_list;
}
public List<Category> getCategoriesList(){
return categoriesList;
}
#Override
public int getCount() {
return categoriesList.size();
}
#Override
public Object getItem(int position) {
return categoriesList.get(position);
}
#Override
public long getItemId(int position) {
return categoriesList.get(position).getID();
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
if (convertView == null) {
convertView = mInflater.inflate(R.layout.categories_list_row, null);
//convertView.setLayoutParams(new ListView.LayoutParams(200, 90));
holder = new ViewHolder();
holder.title = (TextView) convertView.findViewById(R.id.categories_list_row_tv);
//holder.icon = (ImageView) convertView.findViewById(R.id.categories_list_row_iv);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
//holder.icon.setImageResource(categoriesList.get(position).getDrawableID());
//holder.icon.setAdjustViewBounds(true);
//holder.icon.setScaleType(ImageView.ScaleType.CENTER_CROP);
holder.title.setText(categoriesList.get(position).getName());
return convertView;
}
static class ViewHolder {
TextView title;
//ImageView icon;
}
}
In my activity, I use this adapter when the AlertDialog is called to populate the ListView, then I pre-select the categories using the last ones saved in the shared preferences:
private void categoriesFilter(){
AlertDialog.Builder alt_bld = new AlertDialog.Builder(this);
alt_bld.setTitle(resources.getText(R.string.select_categories).toString());
LayoutInflater inflater = (LayoutInflater) getSystemService(LAYOUT_INFLATER_SERVICE);
View layout = inflater.inflate(R.layout.categories_list,(ViewGroup) findViewById(R.id.categories_layout_root));
categoriesLV = (ListView) layout.findViewById(R.id.categories_list);
alt_bld.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
String selectedCategoriesString = getSelectedValues(categoriesLV);
//Update the shared preferences
prefs.edit().putString(RateDayApplication.PREF_KEY_CATEGORIES, selectedCategoriesString).commit();
updateFilterDisplay(resources.getText(R.string.cat_title).toString(), selectedCategoriesString, searchedCategoriesTV, "Category");
}
});
alt_bld.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
dialog.cancel();
}
});
String selectedCategoriesString = prefs.getString(RateDayApplication.PREF_KEY_CATEGORIES, new String());
categoriesLV.setAdapter(new CategoriesLVAdapter(this, categoriesList));
String[] selectedCategoriesArray = selectedCategoriesString.split(",");
int categoriesLVLength = categoriesLV.getCount();
for(int i = 0; i < categoriesLVLength; i++){
int categoryID = ((Category) categoriesLV.getItemAtPosition(i)).getID();
if(Arrays.asList(selectedCategoriesArray).contains(String.valueOf(categoryID))){
categoriesLV.setItemChecked(i, true);
}
}
alt_bld.setView(layout);
AlertDialog alert = alt_bld.create();
alert.show();
}
Finally here is the function I call from my database handler to get the list of catagories:
// Getting All Categories By ID desc
public List<Category> getCategoriesList() {
String selectQuery = "SELECT " + CATEGORY_ID + ", " + CATEGORY_NAME + " FROM " + CATEGORY_TABLE + " ORDER BY " + CATEGORY_ID + " ASC";
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
List<Category> categoriesList = new ArrayList<Category>();//String[] categoriesList = {};
// looping through all rows and adding to list
if (cursor.moveToFirst()) {
do {
Category category = new Category(cursor.getInt(0), cursor.getString(1), false);
categoriesList.add(category);
} while (cursor.moveToNext());
}
cursor.close();
db.close();
return categoriesList;
}
I think my problem before was coming from the fact that the function "setItemChecked" is a little misleading because it does not mean necessarily that anything is checked.
When you use the function "setItemChecked", the item in the list view becomes selected, with or without a checkbox (my rows only contain text views).
The rows selected in my list appear in a different color, and that's enough in my opinion for a simple multi selection list.
The layouts I used are quite simple, "categories_list" contains a ListView in a LinearLayout and "categories_list_row" contains a TextView in a LinearLayout.
Hope it may guide someone!
I've been stuck with this for a long while and it's really frustrating. Basically the app starts off with a ListView containing Movie Titles, their Gross, and Year.
The user then can add a new movie, gross, and year using a different activity from the menu. The values are then returned back to the first activity and is placed at the bottom of the list.
This is where my problem begins. The first problem I had is that the app Force Closes when it's about to display the new item. Now, it doesn't want to display at all. Here's the Code:
public class Lab7_084106 extends ListActivity {
private SampleCustomAdapter adapter;
private ArrayList<MyMovies> movieList;
public static boolean Flag = false;
#SuppressWarnings("null")
#Override
public void onCreate(Bundle savedInstanceState) {
//create stuff
super.onCreate(savedInstanceState);
movieList = new ArrayList<MyMovies>();
Intent data = getIntent();
//Flag = data.getStringExtra("Flag");
String[] oldMovieList = getResources().getStringArray(R.array.movieArray);
String[] oldGrossList = getResources().getStringArray(R.array.worldwideGross);
String[] oldYearList = getResources().getStringArray(R.array.yearArray);
//if there's no new movie to display
if(!Flag){
for (int i = 0; i < oldMovieList.length; i++) {
MyMovies newMovie = new MyMovies();
newMovie.setMovie(oldMovieList[i] + "NEW");
newMovie.setGross(oldGrossList[i]);
newMovie.setYear(oldYearList[i]);
movieList.add(newMovie);
}
//adapter = new SampleCustomAdapter(movieList);
//setContentView(R.layout.row);
//setListAdapter(adapter);
}
else{
Toast.makeText(getApplicationContext(), "Else Entered", Toast.LENGTH_SHORT).show();
int newLength = 50; //oldMovieList.length + 1;
//create new array to store the new value
String[] newMovieArray = new String[newLength];
String[] newGrossArray = new String[newLength];
String[] newYearArray = new String[newLength];
//populate the new list with the old one plus the new one
for (int i = 0; i < newLength; i++) {
if( i != newLength - 1){
newMovieArray[i] = oldMovieList[i];
newGrossArray[i] = oldGrossList[i];
newYearArray[i] = oldYearList[i];
}
else{
newMovieArray[i] = data.getStringExtra("Title");
newGrossArray[i] = data.getStringExtra("Gross");
newYearArray[i] = data.getStringExtra("Year");
}
}
//populate the old one using the new list
for (int i = 0; i < newLength; i++) {
oldMovieList[i] = newMovieArray[i];
oldGrossList[i] = newGrossArray[i];
oldYearList[i] = newYearArray[i];
}
//display stuff
for (int i = 0; i < newLength; i++) {
MyMovies newMovie = new MyMovies();
newMovie.setMovie(oldMovieList[i]);
newMovie.setGross(oldGrossList[i]);
newMovie.setYear(oldYearList[i]);
movieList.add(newMovie);
}
//adapter = new SampleCustomAdapter(movieList);
//setListAdapter(adapter);
}
adapter = new SampleCustomAdapter(movieList);
setListAdapter(adapter);
ListView lv = getListView();
lv.setTextFilterEnabled(true);
//set stuff such that Page2 sends back a result to page 1
lv.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
TextView t = (TextView) view.findViewById(R.id.title);
String name = (String) t.getText();
Toast.makeText(getApplicationContext(), name, Toast.LENGTH_SHORT).show();
}
});
}
private class SampleCustomAdapter extends BaseAdapter {
private ArrayList<MyMovies> internalList;
String[] oldMovieList = getResources().getStringArray(R.array.movieArray);
String[] oldGrossList = getResources().getStringArray(R.array.worldwideGross);
String[] oldYearList = getResources().getStringArray(R.array.yearArray);
private ArrayList<MyMovies> GetSearchResults(){
ArrayList<MyMovies> results = new ArrayList<MyMovies>();
// make sure the arrays have the same length
for (int i = 0; i < oldMovieList.length; i++) {
MyMovies sr = new MyMovies();
sr.setMovie(oldMovieList[i]);
sr.setGross(oldGrossList[i]);
sr.setYear(oldYearList[i]);
results.add(sr);
}
return results;
}
public SampleCustomAdapter(ArrayList<MyMovies> contacts){
internalList = contacts;
}
#Override
public int getCount() {
// TODO Auto-generated method stub
return internalList.size();
}
#Override
public Object getItem(int index) {
// TODO Auto-generated method stub
return internalList.get(index);
}
#Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
// NOTE: you can only do this if you have access to the Activity object
// which is why this is an inner class
LayoutInflater inflater = getLayoutInflater();
View view;
//System.out.println(parent.getClass().getName());
//System.out.println(position);
if (convertView==null){
view = inflater.inflate(R.layout.row, null);
}
else{
view = convertView;
}
// extract the views to be populated
TextView movie = (TextView) view.findViewById(R.id.title);
TextView gross = (TextView) view.findViewById(R.id.gross);
TextView date = (TextView) view.findViewById(R.id.date);
// extract the object that will fill these
MyMovies movies = GetSearchResults().get(position);
//MyMovies movies = internalList.get(position);
movie.setText(movies.getMovie());
gross.setText(movies.getGross());
date.setText(movies.getYear());
// return the view
return view;
}
}
//menu lawl
#Override
public boolean onCreateOptionsMenu(Menu menu){
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menupage1, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
//Handle item selection using item.getItemId()
switch(item.getItemId()){
case R.id.addMovie:
AddMovie();
break;
}
return true;
}
//end menu stuff lol
public void AddMovie(){
Intent intent2 = new Intent(this, com.Android.Lab7.addMovie.class);
startActivity(intent2);
finish();
}
}
The Flag Boolean variable basically tells if the user added a movie. If the user added a movie, it will enter the else statement and update from there. I'm really confused where to put this if-else statement.
I ran a few experiments with the GetSearchResult function of SampleCustomAdapter and found out that it directly affects the output of the ListView. I tried placing the if-else statement there but I ended up with a LOT of items in the ListView.
Using adapter.notifyDataSetChanged(); gives a NullPointerException error and points to where I placed it. So even if do something like:
MyMovies newMovie = new MyMovies();
newMovie.setMovie(data.getStringExtra("Title"));
newMovie.setGross(data.getStringExtra("Gross"));
newMovie.setYear(data.getStringExtra("Year"));
movieList.add(newMovie);
adapter.notifyDataSetChanged();
As the else block, it does not work. I think it has something to do with the fact that I'm getting my initial values from the string.xml resource folder and not via hardcode or user input.
This problem has been frustrating me ever since 2-3 days ago and help is really appreciated. Thanks.
you just have to notify the data set Changed on your adapter
movieList.add(newMovie);
adapter.notifyDataSetChanged();
the listview will be updated automatically
UPDATE
you can always use the following it'll work but I prefer notifying the adapter.
movieList.add(newMovie);
adapter = new SampleCustomAdapter(movieList);
setListAdapter(adapter);
you should use adapter.notifyDataSetChanged(). CheckThis Link
I have created a listview which displays the installed applications. It has app icon + app name + check box. I want to select apps from this list and store the app names in a sqlite DB how should I begin with this?
Like how to identify the selected apps?
here's an adapter I made for one of my apps. This is a classroom attendance function that shows the student's name, photo and a couple of checkboxes (one for here, for for late). The list comes from a SQlite query, but I need to do something with each checkbox that is clicked.
public class MyDataAdapter extends SimpleCursorAdapter {
private Cursor c;
private Context context;
private Long classnum;
private gradeBookDbAdapter mDbHelper;
public static final int LATE=2;
public static final int ATTEND=1;
int idxCol;
int idx;
// itemChecked will store the position of the checked items.
public MyDataAdapter(Context context, int layout, Cursor c, String[] from,
int[] to, Long mRowId) {
super(context, layout, c, from, to);
this.c = c;
this.context = context;
mDbHelper = new gradeBookDbAdapter(context);
mDbHelper.open();
classnum = mRowId;
c.moveToFirst();
}
public class ViewHolder{
public TextView text;
public TextView text2;
public ImageView image;
public CheckBox here;
public CheckBox late;
}
public View getView(final int pos, View inView, ViewGroup parent) {
Bitmap bm;
ImageView studentPhoto;
View vi=inView;
final ViewHolder holder;
if (inView == null) {
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
vi = inflater.inflate(R.layout.show_attendance, null);
holder=new ViewHolder();
holder.text=(TextView)vi.findViewById(R.id.stuname);
holder.text2=(TextView)vi.findViewById(R.id.stuIndex);
holder.image=(ImageView)vi.findViewById(R.id.icon);
holder.here=(CheckBox)vi.findViewById(R.id.attend);
holder.late=(CheckBox)vi.findViewById(R.id.late);
vi.setTag(holder);
}
else
holder=(ViewHolder)vi.getTag();
c.moveToPosition(pos);
int index = c.getColumnIndex(gradeBookDbAdapter.KEY_NAME);
String name = c.getString(index);
holder.text.setText(name);
index = c.getColumnIndex(gradeBookDbAdapter.KEY_ROWID);
String Index = c.getString(index);
holder.text2.setText(Index);
bm = gradeBookDbAdapter.getStudentPhoto(name);
if (bm != null) {
holder.image.setImageBitmap(bm);
}
else {
// use icon image
holder.image.setImageResource(R.drawable.person_icon);
}
// pull out existing attend/late fields and set accordingly
int attend = c.getInt(c.getColumnIndex(gradeBookDbAdapter.KEY_ATTEND));
if(attend==1){
holder.here.setChecked(true);
itemCheckedHere.set(pos, true);
}
//else {
// holder.here.setChecked(false);
// itemCheckedHere.set(pos, false);
//}
int late = c.getInt(c.getColumnIndex(gradeBookDbAdapter.KEY_LATE));
if (late==1){
holder.late.setChecked(true);
itemCheckedLate.set(pos, true);
}
//else {
// holder.late.setChecked(false);
// itemCheckedLate.set(pos, false);
//}
holder.here.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
CheckBox cb = (CheckBox) v.findViewById(R.id.attend);
if (cb.isChecked()) {
itemCheckedHere.set(pos, true);
int Index = new Integer(holder.text2.getText().toString());
mDbHelper.updateAttend(Index, classnum, ATTEND, 1, attendDate );
} else if (!cb.isChecked()) {
itemCheckedHere.set(pos, false);
int Index = new Integer(holder.text2.getText().toString());
mDbHelper.updateAttend(Index, classnum, ATTEND, 0, attendDate );
}
}
});
holder.late.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
CheckBox cb = (CheckBox) v.findViewById(R.id.late);
if (cb.isChecked()) {
itemCheckedLate.set(pos, true);
int Index = new Integer(holder.text2.getText().toString());
mDbHelper.updateAttend(Index, classnum, LATE, 1, attendDate );
} else if (!cb.isChecked()) {
itemCheckedLate.set(pos, false);
int Index = new Integer(holder.text2.getText().toString());
mDbHelper.updateAttend(Index, classnum, LATE, 0, attendDate );
}
}
});
holder.here.setChecked(itemCheckedHere.get(pos)); // this will Check or Uncheck the
holder.late.setChecked(itemCheckedLate.get(pos)); // this will Check or Uncheck the
// CheckBox in ListView
// according to their original
// position and CheckBox never
// loss his State when you
// Scroll the List Items.
return vi;
}
}
Notice I have two sparse arrays "ItemCheckedHere' and "ItemCheckLate". these keep track of which items I've selected. Android doesn't keep track and will reuse a view, so scrolling a list of checkboxes will result in boxes getting checked or unchecked seemingly at random without these arrays I use to maintain the checked status.
you'll need to make a custom listView adapter. You can make each item selectable and then when the user selects an app, you can call the code to insert it into your DB