[英]Android listview item change background color
I can't change my listview item's background color. 我无法更改列表视图项目的背景颜色。
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.info_layout);
ListView listView;
listView = (ListView) findViewById(R.id.infolistView);
final String[] values = new String[] { "TO1", "TO2", "TO3" };
ArrayAdapter<String> adapter =
new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1,
android.R.id.text1,
values);
listView.setAdapter(adapter);
// This is not make anything , why ?
View vi=adapter.getView(0, null, null);
vi.setBackgroundColor(Color.YELLOW);
listView.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
//But here is running good
view.setBackgroundColor(Color.RED);}
});
The way you are doing just gets an instance of a view filled with the data of position, which then dies and is garbage collected after the method is called. 您所做的方式只是获取一个填充了position数据的视图实例,然后该实例死亡并在调用该方法后被垃圾回收。
To change the actual view in the list you will have to change color from your Adapter and write a custom Adapter, or have the color start out in that state. 要更改列表中的实际视图,您必须从适配器更改颜色并编写自定义适配器,或者使颜色以该状态开始。
Basically getView
does not take from a list of views, but just makes a new view, unless you pass it a view. 基本上,
getView
不会从视图列表中获取,而只是创建一个新视图,除非您将其传递给视图。
You have to create Custom adapter to change the item's Background Color. 您必须创建“自定义”适配器才能更改项目的背景色。
Here is the Example of Custom adapter: 这是自定义适配器的示例:
public class PaListAdapter extends BaseAdapter{
private LayoutInflater mInflater;
private ArrayList<String> platevalue = new ArrayList<String>();
ViewHolder holder;
public PaListAdapter(Context context,ArrayList<String> value)
{
// Cache the LayoutInflate to avoid asking for a new one each time.
mInflater = LayoutInflater.from(context);
//mycontext = context;
platevalue.clear();
platevalue =value;
}
public int getCount()
{
return platevalue.size();
}
public Object getItem(int position)
{
return position;
}
public long getItemId(int position)
{
return position;
}
public View getView(int position, View convertView, ViewGroup parent)
{
if (convertView == null)
{
convertView = mInflater.inflate(R.layout.select_dialog, null);
holder = new ViewHolder();
holder.hTransID =(TextView) convertView.findViewById(R.id.txtChoice);
holder.ch =(CheckBox) convertView.findViewById(R.id.chk);
convertView.setTag(holder);
}
else
{
holder = (ViewHolder) convertView.getTag();
}
holder.hTransID.setText(platevalue.get(position));
return convertView;
}
static class ViewHolder
{
TextView hTransID;
}
}
select_dialog.xml
<?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="fill_parent"
android:descendantFocusability="blocksDescendants"
android:background="#000000"
>
<TextView
android:id="@+id/txtChoice"
android:layout_gravity="center_vertical|left"
android:gravity="center_vertical|left"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#000000"/>
</LinearLayout>
In Activity Class.Define it like: 在Activity类中,将其定义为:
simpleefficientadapter efficientadapter;
efficientadapter=new simpleefficientadapter(CLASSNAME.this, VALUES);
listView.setAdapter(efficientadapter);
You can create an instance of the listView item and use the getChildAt()
method which accepts an integer. 您可以创建listView项的实例,并使用接受整数的
getChildAt()
方法。 Then set the view instance background colour - 然后设置视图实例的背景色-
View focusedChild = listView.getChildAt(r);
focusedChild.setBackgroundColor(Color.RED);
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