问题
What is happening i have a listview on which i putting background color change on selection.As well as by default i am putting the first listview item selected as
public class OneWayFlightResult extends BaseAdapter {
private Activity activity;
private ArrayList<HashMap<String, String>> data;
private static LayoutInflater inflater=null;
public OneWayFlightResult(Activity a, ArrayList<HashMap<String, String>> d) {
activity = a;
data=d;
inflater = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return data.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View vi=convertView;
if(convertView==null)
vi = inflater.inflate(R.layout.row, null);
TextView flightTime = (TextView)vi.findViewById(R.id.flightTime); // title
TextView flightCompanyName = (TextView)vi.findViewById(R.id.flightCompanyName); // title
TextView flightNumber = (TextView)vi.findViewById(R.id.flightNumber); // title
ImageView flightLogo = (ImageView)vi.findViewById(R.id.flightLogo);
HashMap<String, String> flight = new HashMap<String, String>();
flight = data.get(position);
flightTime.setText(flight.get(TestActivity.FlightTime));
flightCompanyName.setText(TestActivity.FlightCompanyName);
flightNumber.setText(TestActivity.FlightNumber);
if(position == 0){
vi.setBackgroundResource(R.drawable.selection_effect);
vi.setSelected(true);
}
return vi;
}
This is XML file i am using in this selection_effect.xml
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_focused="true">
<shape>
<solid android:color="#ffffff" />
</shape>
</item>
<item>
<shape>
<solid android:color="#00a7eb" />
</shape>
</item>
</selector>
So by default this the first list view is selected.Now when the user select the another listview item the first one remains selected and the other one also got the same effect.So how could change the effect on click of the listview item dynamically .Means by default first item comes up selected when the user selects other item other one get selected the effect from the default one get removed
回答1:
I got solution for your problem. Do as following.
1) open your main layout file where ListView you have created.
Add android:choiceMode="singleChoice". This will look like below.
<ListView
android:id="@+id/listView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:choiceMode="singleChoice" >
</ListView>
2) Open your list_item.xml layout file. In which, to your root view, add android:background="?android:attr/activatedBackgroundIndicator". In my sample project, its look like below.
<?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="match_parent"
android:background="?android:attr/activatedBackgroundIndicator"
android:orientation="vertical" >
//your views
</LinearLayout>
3) Open your activity file. After setting adapter to your ListView, add list.setSelector(R.drawable.selection_effect);. This will look like below.
ListView ls = (ListView) findViewById(R.id.listView1);
ListAdapter adapter = new ListAdapter(this, data);
ls.setAdapter(adapter);
ls.setSelector(R.drawable.selection_effect);
Here, selection_effect is drawable file which you have created in drawable directory.
I tested my code. Which is working fine.
4) To select first view by default, remove your code in BaseAdapter and put following code after completing 3rd step.
ls.setItemChecked(0,true);
You need to put it after above code like below.
ListAdapter adapter = new ListAdapter(data);
ls.setAdapter(adapter);
ls.setSelector(R.drawable.selection_effect);
ls.setItemChecked(0, true);
Explanation
ls.setSelector(R.drawable.selection_effect);
This will select row item based on selector you have defined in drawable directory.
ls.setItemChecked(0, true);
This will select first item by default at first time run. After you can select other items by clicking on them.
回答2:
You could just declare an int for item clicked which defaults to the first item that starts clicked, then in onclick update accordingly.
int selected = <default>;
set in oncreate etc.
Then you can have onItemClicked listener and do this,
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
if (selected != i){
<listView>.getChildAt(selected).setBackgroundColor(getResources().getColor(android.R.color.background_dark));
<listView>.getChildAt(i).setBackgroundColor(getResources().getColor(android.R.color.holo_blue_light));
selected = i;
}
}
This will change the background colour of the previously selected item back to (in my case) the default android dark theme colour, set the newly selected one to a nice highlighted light blue, and update the selected int to reflect the newly selected item.
回答3:
You can try like this:
after setting adapter for ListView set position to 0 for default selection i.e. listView.setSelection(0); and in onItemClick you get selected position (3rd parameter) of item, so inside onItemClick write listView.setSelection("that 3rd param");
回答4:
I have had similar problem with ListView all you do is when item is clicked call a method on adapter, adadpter.SetPosition(position) {mSelectedPsoiton = position; notifyDataSetChanged();}, and in your getView function check if the position is equal to selectedPosition, then set background accordingly this never fails, focus does not work as ur in touch mode always
//adapter class
public override View GetView(int position, View convertView, ViewGroup parent) { TextView view = null; int lookupPos = position; if (null == convertView) { view = new TextView(_context); view.SetTextSize(ComplexUnitType.Sp, 20); view.SetPadding(_pixels, _pixels, _pixels, _pixels); } else { view = convertView as TextView; }
if (position == mSelectedPos )
{
view.SetBackgroundResource(Android.Resource.Color.HoloBlueDark);
}
else
{
view.SetBackgroundResource(Resource.Drawable.listItemSelector);
}
return view;
}
public void SetSelectedPosition(int position) { mSelectedPos = position;
}
private int mSelectedPos = -1;
// ListView code, _adapter is adapter of listview
listView.SetOnItemClickListener (new OnItemClickListener() { @Override public void onItemClick(AdapterView adapter, View view, int pos, long id) { _adapter.SetSelectionPostion(pos); }
}
来源：https://stackoverflow.com/questions/18103721/unselect-the-listview-item-onclick-in-android