问题
I've been trying to set my background colour on this list view and with following multiple tutorials it just doesn't come up, yet no errors are shown.
What I've got is an xml file called colours in the values folder:
<resources>
<drawable name="red_colour">#6D0E0E</drawable>
</resources>
Which links to an xml in the drawable folder:
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:state_pressed="true"
android:state_activated="true"
android:drawable="@drawable/red_colour">
</item>
</selector>
I've tried placing the following code android:background:@id"colourhighlight.xml" literally everywhere based on various tutorials yet no luck?
Any advice? Please help...
I've got one main class with a context menu:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_user_contacts);
// The contacts from the contacts content provider is stored in this cursor
mMatrixCursor = new MatrixCursor(new String[] { "_id","name","photo","details"} );
// Adapter to set data in the listview
mAdapter = new SimpleCursorAdapter(getBaseContext(),
R.layout.lv_layout,
null,
new String[] { "name","photo","details"},
new int[] { R.id.tv_name,R.id.iv_photo,R.id.tv_details}, 0);
// Getting reference to listview
final ListView lstContacts = (ListView) findViewById(R.id.lst_contacts);
// Setting the adapter to listview
lstContacts.setAdapter(mAdapter);
// Creating an AsyncTask object to retrieve and load listview with contacts
ListViewContactsLoader listViewContactsLoader = new ListViewContactsLoader();
// Starting the AsyncTask process to retrieve and load listview with contacts
listViewContactsLoader.execute();
//Selecting and highlighting the elements in the listview
lstContacts.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
view.setActivated(true);
}
});
//Creating the context menu and the options for it
listview = (ListView) findViewById(R.id.lst_contacts);
listview.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE_MODAL);
listview.setMultiChoiceModeListener(new AbsListView.MultiChoiceModeListener() {
@Override
public void onItemCheckedStateChanged(ActionMode mode, int position, long id, boolean checked) {
count = count+1;
mode.setTitle(count + " Contacts Selected");
}
@Override
public boolean onCreateActionMode(ActionMode mode, Menu menu) {
MenuInflater inflater = mode.getMenuInflater();
inflater.inflate(R.menu.contact_context_menu, menu);
return true;
}
@Override
public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
return false;
}
@Override
public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
switch(item.getItemId()){
case R.id.delete_id:
Toast.makeText(getBaseContext(), count + " Contacts Deselected", Toast.LENGTH_SHORT).show();
count = 0;
mode.finish();
return true;
//break;
default:
return false; //break;
}
//return false;
}
@Override
public void onDestroyActionMode(ActionMode mode) {
}
});
}
lv_layout.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"
>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/iv_photo"
android:maxHeight="80dp"
android:maxWidth="80dp"
android:adjustViewBounds="true"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:id="@+id/tv_name"
android:layout_alignParentTop="true"
android:layout_toRightOf="@+id/iv_photo"
android:layout_toEndOf="@+id/iv_photo" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:id="@+id/tv_details"
android:layout_below="@+id/tv_name"
android:layout_toRightOf="@+id/iv_photo"
android:layout_toEndOf="@+id/iv_photo" />
</RelativeLayout>
Main layout.xml
<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:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context="com.example.ankhit.saveme.UserContacts"
android:background="@drawable/colourhighlight"
>
<ListView
android:id="@+id/lst_contacts"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/button"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/instructions"
android:id="@+id/button"
android:onClick="showInstructions"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true" />
</RelativeLayout>
回答1:
@Override
public void onItemCheckedStateChanged(ActionMode mode, int position, long id, boolean checked)
{
try
{
final int checkedCount = listView.getCheckedItemCount();
mode.setTitle(""+checkedCount);
if (checked)
{
adapter.setNewSelection(position, checked);
}
else
{
adapter.removeSelection(position);
}
adapter.notifyDataSetChanged();
}
catch (Exception e)
{
e.printStackTrace();
}
}
add these methods in your adapter class
private HashMap<Integer, Boolean> mSelection = new HashMap<Integer, Boolean>();
public void setNewSelection(int position, boolean value)
{
mSelection.put(position, value);
}
public boolean isPositionChecked(int position)
{
Boolean result = mSelection.get(position);
return result == null ? false : result;
}
public Set<Integer> getCurrentCheckedPosition() {
return mSelection.keySet();
}
public void removeSelection(int position) {
mSelection.remove(position);
}
public void clearSelection() {
mSelection = new HashMap<Integer, Boolean>();
}
call this method inside getView() method of adapter it works properly
convertView.setBackgroundColor(mContext.getResources().getColor(android.R.color.transparent));
if (mSelection.get(position) != null)
{
convertView.setBackgroundColor(mContext.getResources().getColor(R.color.message_selector_holo_blue));
}
回答2:
If you want highlighting selected row completely then change the background color of the convertview
lstContacts.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
view.setBackgroundColor(mContext.getResources().getColor(android.R.color.transparent));
}
});
来源：https://stackoverflow.com/questions/28976702/highlighting-selected-item-in-custom-list-view-using-context-menu