Develop Reference

How to fill with my own strings

I have implementing a tutorial and I have a problem to adapt to my way.
The main.xml with de ListView
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical"
android:layout_width="fill_parent" android:layout_height="fill_parent">
<ListView android:id="#+id/listView1" android:layout_height="match_parent" android:layout_width="match_parent" />
</LinearLayout>
The rowview.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal" android:layout_width="match_parent"
android:layout_height="wrap_content" android:weightSum="1">
<TextView android:layout_width="wrap_content"
android:layout_height="match_parent" android:id="#+id/text"
android:layout_weight="0.5" android:textSize="25sp" />
<Spinner android:layout_width="0dp" android:layout_height="wrap_content"
android:id="#+id/spin" android:prompt="#string/choice_prompt"
android:layout_weight="0.5" />
</LinearLayout>
The strings.xml file.
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="hello">Hello World, ListViewTestActivity!</string>
<string name="app_name">ListViewTest</string>
<string name="choice_prompt">Select a choice</string>
<string-array name="choices">
<item>Alpha</item>
<item>Bravo</item>
<item>Charlie</item>
</string-array>
</resources>
The ListViewActivity class:
public class ListViewTestActivity extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ListView listView = (ListView) findViewById(R.id.listView1);
DataHolder data = new DataHolder(this);
DataHolder data1 = new DataHolder(this);
DataHolder data2 = new DataHolder(this);
DataHolder data3 = new DataHolder(this);
DataHolder data4 = new DataHolder(this);
DataAdapter d = new DataAdapter(this, R.layout.rowview, new DataHolder[] { data, data1, data2, data3, data4 });
listView.setAdapter(d);
}
}
The DataHolder class:
public class DataHolder {
private int selected;
private ArrayAdapter<CharSequence> adapter;
public DataHolder(Context parent) {
adapter = ArrayAdapter.createFromResource(parent, R.array.choices, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
}
public ArrayAdapter<CharSequence> getAdapter() {
return adapter;
}
public String getText() {
return (String) adapter.getItem(selected);
}
public int getSelected() {
return selected;
}
public void setSelected(int selected) {
this.selected = selected;
}
}
All the DataHolder class :
public class DataAdapter extends ArrayAdapter<DataHolder> {
private Activity myContext;
public DataAdapter(Activity context, int textViewResourceId, DataHolder[] objects) {
super(context, textViewResourceId, objects);
myContext = context;
}
// We keep this ViewHolder object to save time. It's quicker than findViewById() when repainting.
static class ViewHolder {
protected DataHolder data;
protected TextView text;
protected Spinner spin;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View view = null;
// Check to see if this row has already been painted once.
if (convertView == null) {
// If it hasn't, set up everything:
LayoutInflater inflator = myContext.getLayoutInflater();
view = inflator.inflate(R.layout.rowview, null);
// Make a new ViewHolder for this row, and modify its data and spinner:
final ViewHolder viewHolder = new ViewHolder();
viewHolder.text = (TextView) view.findViewById(R.id.text);
viewHolder.data = new DataHolder(myContext);
viewHolder.spin = (Spinner) view.findViewById(R.id.spin);
viewHolder.spin.setAdapter(viewHolder.data.getAdapter());
// Used to handle events when the user changes the Spinner selection:
viewHolder.spin.setOnItemSelectedListener(new OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
viewHolder.data.setSelected(arg2);
viewHolder.text.setText(viewHolder.data.getText());
}
#Override
public void onNothingSelected(AdapterView<?> arg0) {
}
});
// Update the TextView to reflect what's in the Spinner
viewHolder.text.setText(viewHolder.data.getText());
view.setTag(viewHolder);
Log.d("DBGINF", viewHolder.text.getText() + "");
} else {
view = convertView;
}
// This is what gets called every time the ListView refreshes
ViewHolder holder = (ViewHolder) view.getTag();
holder.text.setText(getItem(position).getText());
holder.spin.setSelection(getItem(position).getSelected());
return view;
}
}
To see the result of this code, see -> Android Listview with spinner and a checkbox
This code works, I have a listView with a spinner for each item, but how I can fill spinners with my own Strings? I tryed to fill them in the DataHolder class but it fails. (I have a list of Strings).
Thank's in advance.

All the work is done in the ADAPTER here your DataAdapter.
The cells are constructed in the method GetView, each cells is recycled : if convertView is null you create a new cell to use or else you use convertView.
i assume you must change some code in your DataHolder
public DataHolder(Context parent) {
adapter = ArrayAdapter.createFromResource(parent, R.array.choices, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
}
For now you must understand that the array of choices is provided statically :
R.array.choices
One solution would be to pass your data when constructing the viewHolders here :
viewHolder.data = new DataHolder(myContext);
should looks like something like this :
viewHolder.data = new DataHolder(myContext, myDataArray);
and then in your class change the instanciation of the adapter with something more like that..
public DataHolder(Context parent, ArrayList<String> dataArray) {
adapter = new ArrayAdapter<String>(myContext, yourTextViewId, dataArray);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
}
hopes it help
good luck

Generate background colour in listView from database

I have a listView generated from a database, is there a way to make a background colour or a picture to each "section" in the list:
if the first symbol in "Tip" is "W" the background should be Green, and if its "L" it should be red
Im thinking something like this, but i have no idea where to put it since it have to be done in every section:
tipvalue = BetsDbAdapter.KEY_TIP;
//Here to split the value to gain only "W" or "L"
String arrtip[] = tipvalue.split(" ", 2);
temptip = arrtip[0];
//then set background
if (temptip.equals("W")) {
getWindow().getDecorView().setBackgroundColor(Color.GREEN);
To the left is my listView and right is the xml file to make each "section" in the listview
Here is my database:
This is code generating the listView
public class StoredBets extends Activity {
private BetsDbAdapter dbHelper;
private SimpleCursorAdapter dataAdapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.results);
dbHelper = new BetsDbAdapter(this);
dbHelper.open();
}
#Override
public void onStart(){
super.onStart();
displayListView();
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.results, menu);
return true;
}
public void testknap1(View v) {
Intent myIntent = new Intent(StoredBets.this, Overview.class);
startActivity(myIntent);
}
private void displayListView() {
Cursor cursor = dbHelper.fetchAllStats();
String[] columns = new String[] {
BetsDbAdapter.KEY_SMATCH,
BetsDbAdapter.KEY_TIP,
BetsDbAdapter.KEY_BETAMOUNT,
BetsDbAdapter.KEY_BODDS
};
// the XML defined views which the data will be bound to
int[] to = new int[] {
R.id.smatch,
R.id.tip,
R.id.bodds,
R.id.betamount,
};
// create the adapter using the cursor pointing to the desired data
//as well as the layout information
dataAdapter = new SimpleCursorAdapter(
this, R.layout.storedbets,
cursor,
columns,
to,
0);
ListView listView = (ListView) findViewById(R.id.listView2);
// Assign adapter to ListView
listView.setAdapter(dataAdapter);
listView.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> listView, View view,
int position, long id) {
// Get the cursor, positioned to the corresponding row in the result set
Cursor cursor = (Cursor) listView.getItemAtPosition(position);
// Get the state's capital from this row in the database.
String betMatch =
cursor.getString(cursor.getColumnIndexOrThrow("smatch"));
Toast.makeText(getApplicationContext(),
betMatch, Toast.LENGTH_SHORT).show();
Intent myIntent = new Intent(StoredBets.this, SetWinVoidLoss.class);
myIntent.putExtra("id", id);
startActivity(myIntent);
}
});
}
}
EDIT 2:
#amal
This is the layout(results.xml) with the listview
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context=".StoredBets" >
<ListView
android:id="#+id/listView2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/textView1"
android:layout_alignTop="#+id/button1" >
</ListView>
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_marginLeft="180dp"
android:onClick="testknap1"
android:text="Button" />
</RelativeLayout>

you can get a fair idea from my code,
code snippet for displaying ListViews where the "curSelected" item has a different background:
final ListView lv = (ListView)findViewById(R.id.lv);
lv.setAdapter(new BaseAdapter()
{
public View getView(int position, View convertView, ViewGroup parent)
{
if (convertView == null)
{
convertView = new TextView(ListHighlightTestActivity.this);
convertView.setPadding(10, 10, 10, 10);
((TextView)convertView).setTextColor(Color.WHITE);
}
convertView.setBackgroundColor((position == curSelected) ?
Color.argb(0x80, 0x20, 0xa0, 0x40) : Color.argb(0, 0, 0, 0));
((TextView)convertView).setText((String)getItem(position));
return convertView;
}
public long getItemId(int position)
{
return position;
}
public Object getItem(int position)
{
return "item " + position;
}
public int getCount()
{
return 20;
}
});

This is a tutorial of how to write an adapter for a list view. amal is right, you can change the separate items in the list view in the getView() method.

set onClickListener for spinner item?

I have spinner which populates from database:
catSpinner = (Spinner) findViewById(R.id.spinner1);
cursor = dataAdapter.getAllCategory();
startManagingCursor(cursor);
String[] from = new String[] { DataAdapter.CATEGORY_COL_NAME };
int[] to = new int[] { android.R.id.text1 };
SimpleCursorAdapter catAdapter = new SimpleCursorAdapter(this,
android.R.layout.simple_spinner_dropdown_item, cursor, from,to, 0);
catAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
catAdapter.notifyDataSetChanged();
catSpinner.setAdapter(catAdapter);
And I want to call AlertDialog when I select last item(Add new category...).
After I added new category I want that "item(Add new category...)" was the last again.
How I can do this?

You SHOULD NOT call OnItemClickListener on a spinner. A Spinner does not support item click events. Calling this method will raise an Exception. Check this.
You can apply OnItemSelectedListener instead.
Edit :
spinner.setOnItemSelectedListener(new OnItemSelectedListener()
{
public void onItemSelected(AdapterView<?> parent, View view, int position, long id)
{
String selectedItem = parent.getItemAtPosition(position).toString();
if(selectedItem.equals("Add new category"))
{
// do your stuff
}
} // to close the onItemSelected
public void onNothingSelected(AdapterView<?> parent)
{
}
});
As far as adding "Add new category" to the end of the list is concerned, I think you should better go for custom adapter in which after adding all your items, you can add that constant ("Add new category") to end of array so that it should come last always.

Hook to OnItemClickListener of Spinner. Then check whether the selected item is "Add new category".
If yes, show the dialog to add the new item.
While adding the new item,
Remove the last item "Add new category".
Add the new category entered.
Then Add the item "Add new category" again.
This will make the "Add new category" item as last one.
Code Sample :
layout main.xml :
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:weightSum="10" >
<Spinner
android:id="#+id/cmbNames"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
layout spinner_item.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TextView
android:id="#+id/tvName"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
Activity class :
public class MainActivity extends Activity {
private static final String NAME = "name";
private static final String ADD_NEW_ITEM = "Add New Item";
private SimpleAdapter adapter;
private Spinner cmbNames;
private List<HashMap<String, String>> lstNames;
private int counter;
private OnItemSelectedListener itemSelectedListener = new OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
HashMap<String, String> map = lstNames.get(arg2);
String name = map.get(NAME);
if (name.equalsIgnoreCase(ADD_NEW_ITEM)) {
lstNames.remove(map);
counter++;
addNewName(String.valueOf(counter));
addNewName(ADD_NEW_ITEM);
adapter.notifyDataSetChanged();
}
}
#Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
populateList();
cmbNames = (Spinner) findViewById(R.id.cmbNames);
adapter = new SimpleAdapter(this, lstNames, R.layout.spinner_item,
new String[] { NAME }, new int[] { R.id.tvName });
cmbNames.setAdapter(adapter);
cmbNames.setOnItemSelectedListener(itemSelectedListener);
}
private void populateList() {
lstNames = new ArrayList<HashMap<String, String>>();
addNewName("abc");
addNewName("pqr");
addNewName("xyz");
addNewName(ADD_NEW_ITEM);
}
private void addNewName(String name) {
HashMap<String, String> map = new HashMap<String, String>();
map.put(NAME, name);
lstNames.add(map);
}
}

How do I populate spinner with global string array variable?

I am trying to populate a a spinner but I am getting an error with my String array saying "Array constants can only be used in initializers". My code works fine when i employ the string array as a local variable, but as a global variable it doesn't. I really need to be able to use my string array as a global variable. Thank you in advance. Here is my code:
deleteselection = (Spinner)view.findViewById(R.id.deletespinner);
ArrayAdapter<String> adapterdeletetype;
//createdenominationsarray = getResources().getStringArray(R.array.createdenominations); //<--works
//String [] createdenominationsarray = {"Select Portfolio", "Two", "Three"}; //<--works
createdenominationsarray = {"Select Portfolio", "Two", "Three"};// <--doesn'twork
adapterdeletetype = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item,createdenominationsarray){
#Override
public View getDropDownView(int position, View convertView, ViewGroup parent)
{
View v = null;
// If this is the initial dummy entry, make it hidden
if (position == 0) {
TextView tv = new TextView(getContext());
tv.setHeight(0);
tv.setVisibility(View.GONE);
v = tv;
}
else {
// Pass convertView as null to prevent reuse of special case views
v = super.getDropDownView(position, null, parent);
}
// Hide scroll bar because it appears sometimes unnecessarily, this does not prevent scrolling
parent.setVerticalScrollBarEnabled(false);
return v;
}
};
adapterdeletetype.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
denominationselection.setAdapter(adapterdeletetype);

I did the same thing for one of my project and it works for me. Below is the code snippet for your reference..
ArrayList<String> languages = new ArrayList<String>();
languages.add("English");
languages.add("German");
languages.add("French");
ArrayAdapter<String> langAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,languages);
ListView lv =(ListView)findViewById(R.id.listmain);
lv.setAdapter(langAdapter);
lv.setOnItemClickListener(new listclklisten(MainActivity.this));
public class listclklisten implements OnItemClickListener{
private Context parent;
public listclklisten(Context p){
parent=p;
}
#Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
// TO DO your code here
}
}

inside string.xml Write:
<string-array name="spinner_array_environtment">
<item>Test</item>
<item>Production</item>
</string-array>
Inside your MainActivity.java :
public class MainActivity extends Activity {
Spinner spinner_environment;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
spinner_environment = (Spinner) findViewById(R.id.spinnerview);
adapter =ArrayAdapter.createFromResource(this, R.array.spinner_array_environtment,R.layout.spinner_phone);
adapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line);
spinner_environment.setAdapter(adapter);
}
Inside spinner_phone.xml :
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/spinnerTarget"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textSize="13dp"
android:textColor="#4C4646" />
try this out. Hope it will help you.

Android custom listview

Hi i've got a custom listview with a text view and a button in each row.
Im having trouble trying to use the buttons . Each button will fire a different intent. This is the xml file for the list view rows.
<?xml version="1.0" encoding="UTF-8"?>
<RelativeLayout
android:id="#+id/widget28"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
xmlns:android="http://schemas.android.com/apk/res/android"
>
<Button
android:id="#+id/widget29"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Remind me"
android:layout_alignParentRight="true"
/>
<TextView android:id="#+id/text12"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#ff99ccff"
android:text="Text view" />
</RelativeLayout>
Then i have another xml file which simply contains the list view in a linear layout.
This is my custom array class.
public class customArray extends ArrayAdapter<String> {
int resource;
public customArray(Context cont, int _resource, List<String> items) {
super (cont, _resource,items);
resource = _resource;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
RelativeLayout rl;
String prod = getItem(position);
if (convertView == null) {
rl = new RelativeLayout(getContext());
LayoutInflater vi = (LayoutInflater)getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
vi.inflate(resource, rl, true);
} else {
rl = (RelativeLayout)convertView;
}
TextView t1 = (TextView)rl.findViewById(R.id.text12);
t1.setText(prod);
Button b1 = (Button)rl.findViewById(R.id.widget29);
return rl;
}
}
Then the final class which gets the data from a database and uses the custom adapter to display the information. Does anyone know how i would call each button?
`public class SatMain extends Activity {
/** Called when the activity is first created.
* #param cont */
#Override
public void onCreate(Bundle savedInstanceState)
{
List<String> results = new ArrayList<String>();
super.onCreate(savedInstanceState);
setContentView(R.layout.satmain);
dbAdapter db = new dbAdapter(this);
// button.setOnClickListener(m);
//---get all titles---
db.open();
db.InsertData();
Cursor c = db.getSat1();
if (c.moveToFirst())
{
do {
String pub = c.getString(c.getColumnIndex(db.KEY_Artist));
String pub1 = c.getString(c.getColumnIndex(db.KEY_Time));
results.add(pub + pub1 );
} while (c.moveToNext());
}
db.close();
ListView listProducts;
customArray ca = new customArray(this, R.layout.button, results);
listProducts = (ListView)findViewById(R.id.list1);
listProducts.setAdapter(ca);
ca.notifyDataSetChanged();
}
}`

In the "getView" method of your adapter, you should set an onClick listener for the button. You can do an anonymous class so that you can refer to the contents of the row in the button. I.e, add the following where you get b1 in your example.
b1.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
//create activity based on prod
}
});