Develop Reference

Android Spinner arrow closer?

Can I move the arrow somewhat closer to the text, in a easy way? Don't really understand the purpose of this as default when its transparent.
<Spinner
android:id="#+id/spinner_months"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>

I have answered a similar question here: https://stackoverflow.com/a/42596698/1260126
This can be achieved by creating a custom layout for the selected spinner item custom_spinner_item.xml. I have added a TextView which displays the currently selected spinner item. The arrow icon is added in an ImageView. You can use any icon. The arrow icon moves depending on the length of the text. In fact you can completely modify the look of your spinner in this layout.
<?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="wrap_content"
android:layout_gravity="center_vertical"
android:orientation="horizontal">
<TextView
android:id="#+id/spinner_item_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:paddingLeft="10dp"
android:paddingRight="10dp"/>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:src="#mipmap/ic_arrow_down"/>
</LinearLayout>
Create a custom spinner adapter and inflate the above view. Also set the text of your selected spinner item from your list by overriding the default getView() method.
public class CustomSpinnerAdapter extends ArrayAdapter<String> {
LayoutInflater inflater;
List<String> spinnerItems;
public CustomSpinnerAdapter(Context applicationContext, int resource, List<String> spinnerItems) {
super(applicationContext, resource, spinnerItems);
this.spinnerItems = spinnerItems;
inflater = (LayoutInflater.from(applicationContext));
}
#Override
public View getView(int i, View view, ViewGroup viewGroup) {
view = inflater.inflate(R.layout.custom_spinner_item, null);
TextView type = (TextView) view.findViewById(R.id.spinner_item_text);
type.setText(spinnerItems.get(i));
return view;
}
}
Then instantiate the CustomSpinnerAdapter class and set it as your spinner's adapter. spinnerList is the list of items to be shown in the spinner.
CustomSpinnerAdapter customSpinnerAdapter = new CustomSpinnerAdapter(getContext(), android.R.layout.simple_spinner_item, spinnerList);
spinner.setAdapter(customSpinnerAdapter);

Android: ArrayAdapter requires the resource ID to be a TextView?

I'm trying to implement a code in which a list of linear layouts are inserted in the list view by using the array adapter. Each linear layout contains two subviews. Here's the xml.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/list_item"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="#+id/list_icon"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="10dp"/>
<TextView
android:id="#+id/list_label"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_marginLeft="10dp"
android:padding="10dp"
android:textSize="16sp" />
</LinearLayout>
Now in the fragment I created a code snippet like this.
final String[] my_page_items = getResources().getStringArray(R.array.my_page_items);
int[] my_page_icons = {
R.mipmap.ic_about,
R.mipmap.ic_app_settings,
R.mipmap.ic_account_settings,
R.mipmap.ic_logout
};
LinearLayout[] items = new LinearLayout[my_page_items.length];
TextView[] labels = new TextView[my_page_items.length];
ImageView[] icons = new ImageView[my_page_icons.length];
for(int i=0; i<my_page_icons.length; i++) {
items[i] = (LinearLayout) LayoutInflater.from(getActivity().getApplication()).inflate(R.layout.list_item, null);
labels[i] = (TextView) items[i].findViewById(R.id.list_label);
icons[i] = (ImageView) items[i].findViewById(R.id.list_icon);
labels[i].setText(my_page_items[i]);
icons[i].setBackground(getResources().getDrawable(my_page_icons[i]));
}
setListAdapter(new ArrayAdapter<>(getActivity(), R.layout.list_item, items));
lv = getListView();
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
});
When I run this code, I get the the following in the logcat.
java.lang.IllegalStateException: ArrayAdapter requires the resource ID to be a TextView
How should this problem be solved?

In
new ArrayAdapter<>(getActivity(), R.layout.list_item, items)
R.Layout.list_item must be the id of a xml layout file containing only a TextView(the TextView can't be wrapped by another layout, like a LinearLayout, RelativeLayout etc!),
EDIT possible solution :
If you want your list row layout to be something a little different then a simple TextView widget use this constructor:
new ArrayAdapter<>(getActivity(), R.layout.list_item, R.id.id_of_your_textview items)
where you supply the id of a layout that can contain various views, but also must contain a TextView with and id(the third parameter) that you pass to your ArrayAdapter so it can know where to put the Strings in the row layout.

Android ListView shows empty content

I have a fragment with a listview. The adapter only has one field: the item id.
When I add an item to the list using the adapter, the list shows the item id.
But if I put a simple item id check before (a for-cycle that checks if the item id is equals to one specific id, if so then adds the item id), the list shows an empty row (like it added something) but without showing the item id.
What could be? I'm sure that the "check part" works.
EDIT: I forgot to specify that the item id is a String.
EDIT 2: I added the check part of the code. It loops through list that contains the item ids that I want to add to the other fragment list. item is the item that I'm checking. blueF is the fragment.
for(int i=0; i<list.getCount();i++) {
if(list.getItem(i).equals(item.getId())) {
//send the item to the listview of the fragment
blueF.getArrayAdapter().addItem(item);
break;
}
}
EDIT 3: After some testing, I discovered that the listview inside the fragment have inside the item (I used getCount and also printed the item id), but it isn't showing the item id! My custom adapter have a notifyDataSetChanged() in the "add" method and I've also recalled the notifyDataSetChanged after the call to the add method in the activity...but nothing.
EDIT 4: Probably is some problem with the layout?
I have this layout for the list row:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/inventory_item_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal" >
<TextView
android:id="#+id/inventory_item"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="0.4"
android:textSize="17sp"
android:typeface="monospace" >
</TextView>
<TextView
android:id="#+id/inventory_item_counter"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:textSize="17sp"
android:typeface="monospace" />
</LinearLayout>
the fragment layout with the listview:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<ListView
android:id="#+id/listBlueTagView"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
</ListView>
</RelativeLayout>

Your filter code should be done before setting the Data of the Adapter, so the Adapter have only the items that it will show.

From your question, I understood this,
Try this in your main Activity, these are just Pseudo codes there may be some typos.
public class Main extends Activity{
EditText etID; //Your Item ID field.
ListView listView; // Listview in your XML.
int check_ID; // ID which you want to compare with Edit Texts' value.
List<String> arrayList= new ArrayList<String>();
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.Your_Layout_XML);
etID = (EditText) findViewById(R.id.editTextID); //ITEM_ID editText id in XML
listView = (ListView) findViewById(R.id.your_ListView_ID);
check_ID = 1; // suppose you want to add into your list if user enters 1 in editText as Item ID
if(check_ID = Integer.parseInt(etID.getText().toString())) //get value from EditText then check it with your desired value and on being equal add item to list
// add item here and set it to listView
arrayList.add("Mango");
ArrayAdapter<String> array_Adapter = new ArrayAdapter<String>(
this,
android.R.layout.simple_list_item_1,
arrayList);
listView .setAdapter(array_Adapter );
} else{
Toast.makeText(getApplicationContext(),"Wrong ITEM ID",Toast.LENGTH_SHORT).show();
}
}

I've resolved the problem.
It was a graphic problem generated in the getView of the adapter. Basically, some elements overwrote the color text of the ID, rendering it invisible.
I set the text color to Color.BLACK and now I can see the ID of the item.

listview adding spinner in each row?

I am facing problem while putting Spinner in layout. My acctual requirement is to place Spinner once, at the top of layout.
This output I am getting:
I have Relative layout
<Spinner
android:id="#+id/spinner1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:entries="#array/string_array"
android:prompt="#string/spinner_msg"
/>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/notesTextView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textColor="#android:color/white"
android:minHeight="?android:attr/listPreferredItemHeight"
android:gravity="center_vertical"
android:textAppearance="?android:attr/textAppearanceMedium"
</TextView>`
MyActivity class is extended by ListActivity here's onCreate method
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
listView=getListView();
listView.setOnItemClickListener(listener);
spinner1=(Spinner)findViewById(R.id.spinner1);
getDetailsCursor();
String[] from = new String[] {"db_column"};
int[] to = new int[] { R.id.notesTextView};
curAdapter=new SimpleCursorAdapter(MyActivity.this, R.layout.mylist, null, from, to);
setListAdapter(curAdapter);
registerForContextMenu(listView);
}`

Here is the code in which spinner inflates on the top of listview :
listView= (ListView) findViewById(R.id.list);
LayoutInflater inflater = LayoutInflater.from(this);
View mTop = inflater.inflate(R.layout.spin, null);
authorityView.addHeaderView(mTop);
R.layout.spin is that layout which contains only spinner.
And inside the List you have to inflate textView only. as you are doing in mylist.xml ,
just remove spinner from it and made seprate xml for spinner.
so spinner is once, at the top of layout (ListView).

I have some difficulty making out what your actual question is, some layout.xml code would help here, too. I think, that you are placing the spinner inside the listitem.xml instead of the main.xml, so that it gets replicated for each item in your listview. Please share some code.
Since you declare both the TextView and the Spinner in mylist.xml, you get both those elements in each Item of your List.
If you only want one spinner, you shouldn't use a ListActivity, but instead create a normal Activity with a Spinner and a ListView in the Layout. Then define another layout to use for the list items (e.g. with only the TextView).

Android ListView select items to delete with 3 column layout

I'd like to implement a Listview in android in which I have the possibility to enable a delete mode, in which the user can select the entries to delete. It should be similar to the message application in android.
I already have a ListActivity which has an icon on the left and text on the right side. I now like to add a CheckBox floating on the right side of the list entry. The ListActivity is listed in another question by a friend of mine: android listactivity background color .
The layout should be:
Left Picture
Center List item
Right Checkbox for delete selection
How can I achieve this? Is there a standard ListView item in the framework I could use?

I guess you want a CheckBox to appear(only) when is time to delete items from the ListView. Assuming you use the layout from the other question:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="5dp"
android:background="#color/darkbluelogo" >
<ImageView android:id="#+id/list_image"
android:layout_width="48dip"
android:layout_height="48dip"
android:contentDescription="#id/list_image"
/>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="fill_parent"
android:padding="5dp"
android:background="#color/darkbluelogo"
android:scrollingCache="false"
android:cacheColorHint="#00000000" >
<TextView
android:id="#+id/title"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="#+id/title" >
</TextView>
<TextView
android:id="#+id/datetime"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="#+id/datetime" >
</TextView>
</LinearLayout>
<CheckBox
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:visibility="gone" />
</LinearLayout>
When the ListView starts the CheckBox will not be present and the content TextViews will occupy all the space. Add a flag in the getView method of your adapter that will signal that the CheckBox must be shown(here you will set the CheckBox's visibility from the layout to visible). When its time to delete items modify the flag and then call notifyDataSetChanged() so the ListView redraws its children, this time with the CheckBox present.
Note:
You'll have to store the status of the CheckBoxes yourself.

First of all you need a custom layout for your list entries. A simple RelativeLayout including an ImageView , a TextView and a CheckBox should be enough.
Then you might want to build your own custom adapter which can extend BaseAdapter (or SimpleAdapter or CursorAdapter or ArrayAdapter or...). The adapter will bind the list's data to your custom layout. If for example your data is contained in a Cursor it will look like:
private class MyCustomAdapter extends CursorAdapter {
public MyCustomAdapter(Context context) {
super(context, null);
}
#Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
//Return a list item view
return getLayoutInflater().inflate(R.layout.my_custom_list_item_layout, parent, false);
}
#Override
public void bindView(View view, Context context, Cursor cursor) {
//Get views from layout
final ImageView imageView = (ImageView) view.findViewById(R.id.list_item_image);
final TextView textView = (TextView) view.findViewById(R.id.list_item_text);
final CheckBox checkBox = (CheckBox) view.findViewById(R.id.list_item_checkbox);
//Get data from cursor
final String text = cursor.getString(...);
//Add listener to the checkbox
checkBox.setOnClickListener(new OnClickListener() {...});
//Bind data
textView.setText(text);
}
}