Develop Reference

textview of listview in android

I have Listview that contains a Textview, I populate data from sqlite inside them , now I want to change the textview background color for each row based on the value in each one.
I couldn't do it , can anybody help me for how to get each textview from the listview ??
Edit :
Here is my code to populate the listview:
sql = new SqlCommands(getApplicationContext());
Fields = new String[]{SqlCommands.Group, SqlCommands.Subject, SqlCommands.Body, SqlCommands.DateTime};
int [] Dview = new int []{R.id.grop, R.id.sbj,R.id.bdy,R.id.DT};
Cursor c = sql.GetData();
Adpt = new SimpleCursorAdapter(getApplicationContext(),R.layout.items, c , Fields, Dview ,0 );
NotiLst.setAdapter(Adpt);
this is the XML file for the items :
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:background="#drawable/grp_shap" >
<ImageView android:id="#+id/Prio"
android:layout_width="32dip"
android:layout_height="32dip"
/>
<TextView
android:id="#+id/grop"
android:layout_width="64sp"
android:layout_height="40sp"
android:layout_alignBottom="#+id/Prio"
android:layout_alignParentLeft="true"
android:text="S"
android:textSize="12sp" />
<TextView
android:id="#+id/DT"
android:layout_width="wrap_content"
android:layout_height="14sp"
android:layout_alignParentRight="true"
android:layout_alignTop="#id/title"
android:gravity="right"
android:text="Date Rec"
android:layout_marginRight="5dip"
android:textSize="12sp"
/>
<TextView
android:id="#+id/bdy"
android:layout_width="fill_parent"
android:layout_height="28sp"
android:layout_below="#+id/DT"
android:layout_toLeftOf="#+id/hi"
android:layout_toRightOf="#+id/Prio"
android:text="Body"
android:textSize="12sp" />
<TextView
android:id="#+id/sbj"
android:layout_width="fill_parent"
android:layout_height="12sp"
android:layout_alignLeft="#+id/bdy"
android:layout_alignParentTop="true"
android:layout_alignRight="#+id/bdy"
android:fontFamily="sans-serif"
android:text="Subject"
android:textSize="12sp" />
<ImageView
android:id="#+id/hi"
android:layout_width="20dip"
android:layout_height="26dip"
android:layout_alignLeft="#+id/DT"
android:layout_below="#+id/DT"
android:layout_marginLeft="15dp"
android:src="#drawable/highprio" />
</RelativeLayout>
and I have a listview on the activity_mail layout which populated whith this items.
I want to change the color for the textview with id grop based on the value inserted on it

You should use a custom adapter:
public class MyAdapter extends BaseAdapter {
private static class ViewHolder {
public final TextView mTv;
}
private final Context mContext;
private final List<String> mList; //you can change this to String array
public MyAdapter (Context context, List<String> list) {
this.mContext = context;
this.mList= list;
}
#Override
public int getCount() {
return mList.size();
}
#Override
public String getItem(int position) {
return mList.get(position);
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder h;
final String string = mList.get(position);
if (convertView == null) {
convertView = View.inflate(mContext, R.layout.item_listview, null);
h = new ViewHolder();
h.mTv= (TextView) convertView .findViewById(R.id.mTvRes);
convertView.setTag(h);
} else {
h = (ViewHolder) convertView.getTag();
}
h.mTv.setText....
h.mTv.setTextColor....
h.mTv.setBackground....
return convertView;
}
}
in your activity:
List<String> list = Arrays.asList(Fields);
MyAdapter adapter = new MyAdapter(this, list);
NotiLst.setAdapter(adapter);
I didn't checked it and you maybe need to do some changes but it should work.

If you have something like this:
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolder viewHolder;
if(convertView == null) {
LayoutInflater inflater = LayoutInflater.from(getContext());
convertView = inflater.inflate(resource, parent, false);
viewHolder = new ViewHolder();
viewHolder.label = (TextView) convertView.findViewById(android.R.id.text1);
viewHolder.label.setBackground(getResources().getColor(color.white));
convertView.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) convertView.getTag();
}
viewHolder.label.setText(activitiesList.get(position).getName());
return convertView;
}

change imagebutton resource in listview

Im working on simple feedreader app. in my main activity i have listview that show all items . in each row i have imagebutton for save that item and when user click on that the image of imagebutton must be change(like fav icon on twitter) but it does not change ! After scrolling changes are observed !
this is my row layout .
<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:descendantFocusability="blocksDescendants" >
<TextView
android:id="#+id/tvListViewItemTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:layout_marginRight="15dp"
android:layout_marginTop="15dp"
android:text="#string/listview_item_title"
android:textSize="25dp" />
<TextView
android:id="#+id/tvListViewItemText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignRight="#+id/tvListViewItemTitle"
android:layout_below="#+id/tvListViewItemTitle"
android:layout_marginTop="20dp"
android:text="#string/listview_item_text"
android:textSize="18dp" />
<TextView
android:id="#+id/tvListViewItemTime"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignRight="#+id/tvListViewItemText"
android:layout_below="#+id/tvListViewItemText"
android:layout_marginTop="22dp"
android:paddingTop="5dp"
android:text="#string/listview_item_time" />
<ImageButton
android:id="#+id/ibListViewItemSave"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignTop="#+id/tvListViewItemTime"
android:layout_marginLeft="20dp"
android:paddingTop="11dp"
android:src="#drawable/icon_save_story_2x"
android:background="#null" />
and this is my custom adapter class.
public class FeedListAdapter extends ArrayAdapter<FeedItem> {
private final Activity context;
private final List<FeedItem> list;
public FeedListAdapter(Activity context, List<FeedItem> list) {
super(context, R.layout.feed_listview_item_type1, list);
this.context = context;
this.list = list;
}
static class ViewHolder {
TextView tvTitle;
TextView tvText;
TextView tvTime;
ImageButton ibSave;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View rowView = convertView;
if (rowView == null) {
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
rowView = inflater.inflate(R.layout.feed_listview_item_type1, parent,false);
// configure view holder
ViewHolder holder = new ViewHolder();
holder.tvTitle = (TextView)rowView.findViewById(R.id.tvListViewItemTitle);
holder.tvText = (TextView)rowView.findViewById(R.id.tvListViewItemText);
holder.tvTime = (TextView)rowView.findViewById(R.id.tvListViewItemTime);
holder.ibSave = (ImageButton)rowView.findViewById(R.id.ibListViewItemSave);
rowView.setTag(holder);
}
// fill data
ViewHolder holder = (ViewHolder) rowView.getTag();
final FeedItem feedItem = list.get(position);
holder.tvTitle.setText(feedItem.getTitle());
holder.tvText.setText(feedItem.getText());
holder.tvTime.setText(feedItem.getTime());
if(feedItem.isSave()) holder.ibSave.setImageResource(R.drawable.icon_saved_story_2x);
else holder.ibSave.setImageResource(R.drawable.icon_save_story_2x);
final String msg = " "+(position+1);
holder.ibSave.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
if(feedItem.isSave()){
feedItem.setSave(false);
Toast.makeText(context,
msg+"deleted", Toast.LENGTH_SHORT).show();
//holder.ibSave.setImageResource(R.drawable.icon_save_story_2x);
}else{
feedItem.setSave(true);
Toast.makeText(context,
msg+"saved", Toast.LENGTH_SHORT).show();
//holder.ibSave.setImageResource(R.drawable.icon_saved_story_2x);
}
}
});
return rowView;
}
}

Call notifyDataSetChanged in your onClick after the if else.
At present the FeedListAdapter does not realize that you have made some changes to the list

Can't find ViewByID in Custom Adapter

I created my own custom adapter that extends Array Adapter:
public class AdapterGeoArea extends ArrayAdapter<GeoArea>{
private Context _context;
private int resource;
private ArrayList<GeoArea> _myGeoArea;
public AdapterGeoArea(Context context, ArrayList<GeoArea> myGeoArea) {
super(context, 0, myGeoArea);
_context = context;
_myGeoArea = myGeoArea;
}
public int getCount() {
return _myGeoArea.size();
}
public View getView(int position, View convertView, ViewGroup parent) {
LinearLayout GeoAreaView;
if (convertView == null) {
GeoAreaView = new LinearLayout(_context);
LayoutInflater li = LayoutInflater.from(_context);
convertView = li.inflate(R.layout.layout_geo_areas, null);
}
else {
GeoAreaView = (LinearLayout) convertView;
}
GeoArea curGeoArea = _myGeoArea.get(position);
TextView name = (TextView) GeoAreaView.findViewById(R.id.txtGeoAreaName);
name.setText(curGeoArea.name);
return convertView;
}
static class ViewHolder {
TextView name;
RelativeLayout childContainer;
}
#Override
public Filter getFilter() {
return null;
}
}
And here is how I am using it in my main:
public class ActivityGeoAreas extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.layout_geo_areas);
GeoArea.searchTerm = "Bar & Grill";
GeoArea torontoArea = new GeoArea("cityOfToronto");
ArrayList<GeoArea> testList = new ArrayList<GeoArea>();
testList.add(torontoArea);
AdapterGeoArea adapter = new AdapterGeoArea(this, testList);
ListView lv = (ListView) findViewById(R.id.textGeoArea);
lv.setAdapter(adapter);
}
}
Everything seem to be fine except for this line:
TextView name = (TextView) GeoAreaView.findViewById(R.id.textGeoArea);
And here is how I defined my layout:
<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=".ActivityGeoAreas" >
<TextView
android:id="#+id/textGeoArea"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:text="Choose Area"
android:textAppearance="?android:attr/textAppearanceLarge" />
<LinearLayout
android:id="#+id/LinearLayoutGeoAreas"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/textGeoArea"
android:layout_below="#+id/textGeoArea"
android:orientation="vertical" >
<ListView
android:id="#+id/listViewGeoArea"
android:layout_width="wrap_content"
android:layout_height="match_parent" >
</ListView>
</LinearLayout>
</RelativeLayout>
It simply can't find the TextView textGeoArea and this line become null, what am I doing wrong?

Change this
TextView name = (TextView) GeoAreaView.findViewById(R.id.txtGeoAreaName);
to
TextView name = (TextView) convertView.findViewById(R.id.txtGeoAreaName);
I guess you have got confused.
Move textview to a new layout list_item.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TextView
android:id="#+id/textGeoArea"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="14dp"
android:text="Choose Area"
android:textAppearance="?android:attr/textAppearanceLarge" />
</RelativeLayout>
Now change your getView as below
LayoutInflater inflater;
public AdapterGeoArea(Context context, ArrayList<GeoArea> myGeoArea) {
super(context, 0, myGeoArea);
_context = context;
_myGeoArea = myGeoArea;
inflater = LayoutInflater.from(context); // initialize inflater
}
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = inflater.inflate(R.layout.list_row,parent,false);
holder = new ViewHolder();
holder.tv = (TextView)convertView.findViewById(R.id.textGeoArea);
holder.setTag(convertView);
}
else {
holder = (ViewHolder) convertView.getTag();
}
GeoArea curGeoArea = _myGeoArea.get(position);
holder.tv.setText(curGeoArea.name);
return convertView;
}
static class ViewHolder // use a view holder for smooth scrolling an performance
{
TextView tv;
}

On the first pass, GeoAreaView is a childless LinearLayout since you just created it. convertView is the View initialized your layout which holds the TextView. So you need to use that to find the TextView.
TextView name = (TextView) convertView.findViewById(R.id.txtGeoAreaName);
I see you have a ViewHolder but you don't appear to be using it. You may want to take a little time and go through a good tutorial on using ListView.
This guy usually seems to have good tutorials

ActionBarSherlock list navigation with icon and title

I am developing an application where navigation is done by using the spinner on the action bar. Spinner items needed to include icons as well so I created custom layouts for that.The problem is that spinner is too wide with respect to its items. I am using ActionBarSherlock. The codes I wrote so far:
navigation_list_item.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="center_vertical"
android:orientation="horizontal">
<ImageView
android:id="#+id/icon"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:adjustViewBounds="true"
android:padding="4dip"/>
<TextView
android:id="#+id/title"
style="?attr/spinnerItemStyle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ellipsize="marquee"
android:singleLine="true"
android:layout_gravity="center_vertical"/>
</LinearLayout>
navigation_list_dropdown_item.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:orientation="horizontal" >
<ImageView
android:id="#+id/icon"
android:layout_width="wrap_content"
android:layout_height="?attr/dropdownListPreferredItemHeight"
android:adjustViewBounds="true"
android:padding="4dip"/>
<TextView
android:id="#+id/title"
style="?attr/spinnerDropDownItemStyle"
android:layout_width="match_parent"
android:layout_height="?attr/dropdownListPreferredItemHeight"
android:ellipsize="marquee"
android:singleLine="true" />
</LinearLayout>
NavigationListAdapter.java:
public class NavigationListAdapter extends BaseAdapter{
private Drawable[] mIcons;
private String[] mTitles;
private Context mContext;
private LayoutInflater mInflator;
public NavigationListAdapter(Context context, Drawable[] icons, String[] titles){
mContext = context;
mInflator = (LayoutInflater)mContext.getSystemService(
Context.LAYOUT_INFLATER_SERVICE);
mIcons = icons;
mTitles = titles;
}
#Override
public int getCount() {
return mTitles.length;
}
#Override
public Object getItem(int position) {
return mTitles[position];
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if(convertView == null){
convertView = mInflator.inflate(R.layout.navigation_list_item, parent, false);
holder = new ViewHolder();
holder.icon = (ImageView)convertView.findViewById(R.id.icon);
holder.title = (TextView)convertView.findViewById(R.id.title);
convertView.setTag(holder);
}else{
holder = (ViewHolder)convertView.getTag();
}
holder.title.setText(mTitles[position]);
holder.icon.setImageDrawable(mIcons[position]);
return convertView;
}
#Override
public View getDropDownView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if(convertView == null){
convertView = mInflator.inflate(R.layout.navigation_list_dropdown_item, parent, false);
holder = new ViewHolder();
holder.icon = (ImageView)convertView.findViewById(R.id.icon);
holder.title = (TextView)convertView.findViewById(R.id.title);
convertView.setTag(holder);
}else{
holder = (ViewHolder)convertView.getTag();
}
holder.title.setText(mTitles[position]);
holder.icon.setImageDrawable(mIcons[position]);
return convertView;
}
private class ViewHolder{
public ImageView icon;
public TextView title;
}
}
onCreate method of the activity:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Context context = getSupportActionBar().getThemedContext();
TypedArray ta = getResources().obtainTypedArray(R.array.leagues);
Drawable[] logos = new Drawable[ta.length()];
for(int i = 0; i < logos.length; i++){
logos[i] = ta.getDrawable(i);
}
NavigationListAdapter adapter = new NavigationListAdapter(context, logos,
getResources().getStringArray(R.array.league_names));
getSupportActionBar().setDisplayShowTitleEnabled(false);
getSupportActionBar().setNavigationMode(ActionBar.NAVIGATION_MODE_LIST);
getSupportActionBar().setListNavigationCallbacks(adapter, null);
}
An illustration of the problem:

Maybe changing the width of your textview in navigation_list_dropdown_item.xml to wrap_content take effect (if changing width of LinearLayout does not work). You can see this to: http://dandar3.blogspot.com.es/2013/03/actionbarsherlock-custom-list-navigation.html .

Properly use SpinnerAdapter

I'm trying to get my spinneradapter working. I get no error's but
the spinner remains empty. I have read multiple tutorials but they aren't seem to work
very well. I'm trying to turn every row in a specifik color, that's why I need the adapter.
This is my code:
public class spinnerAdapter extends ArrayAdapter<String> implements
SpinnerAdapter {
Context context;
ArrayList<String> dateArray;
public spinnerAdapter(Context context, ArrayList<String>dateArray) {
super(context, R.layout.ruilen2_spinner);
this.context = context;
this.dateArray = dateArray;
}
static class ViewHolder {
public TextView textView;
public TextView textView2;
}
#Override
public View getDropDownView(int position, View view, ViewGroup parent) {
View rowView = view;
final ViewHolder holder;
if (rowView == null) {
LayoutInflater vi = (LayoutInflater) getContext().getSystemService(
Context.LAYOUT_INFLATER_SERVICE);
rowView = vi.inflate(R.layout.ruilen2_spinner, null);
holder = new ViewHolder();
holder.textView = (TextView)rowView.findViewById(R.id.spinnerdate);
//holder.textView2 = (TextView)rowView.findViewById(R.id.spinnerworkplace);
rowView.setTag(holder);
}
else{
holder = (ViewHolder) rowView.getTag();
}
holder.textView.setText(dateArray.get(position));
return super.getDropDownView(
position, rowView, parent);
}
}
Here's the code snippet where I call the class:
s.setAdapter(new spinnerAdapter(getParent(),namen));
And last but not least the XML:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal" android:background="#color/white"
android:layout_width="fill_parent" android:layout_height="fill_parent">
<TextView android:layout_width="wrap_content"
android:layout_height="wrap_content" android:id="#+id/spinnerdate" android:textColor="#color/black"></TextView>
<TextView android:layout_width="wrap_content"
android:layout_height="wrap_content" android:id="#+id/spinnerworkplace" android:textColor="#color/black"></TextView>
</LinearLayout>

If it is displaying but is empty then you might not be creating your dateArray properly. Did you check to make sure namen in s.setAdapter(new spinnerAdapter(getParent(),namen)); has anything in it?