[英]Spinner selection not working Android
I have a listView with n number of rows each row contains textview1(for text), textview2(For id) and spinner. 我有一个具有n行数的listView,每行包含textview1(用于文本),textview2(用于id)和微调器。 I want to select spinner in multiple rows.
我想在多行中选择微调器。 Here the problem is once i scroll the listView the selection is gone (Recycle listView).
这里的问题是,一旦我滚动listView,选择就消失了(回收listView)。
I have store the id in a ArrayList(Which rows spinner selected) and selected position of the spinner. 我已将ID存储在ArrayList(选择了哪些行微调器)和微调器的选定位置中。 In onScroll method of listView i try to use
spinner.setSelection(position);
在listView的onScroll方法中,我尝试使用
spinner.setSelection(position);
but it won't work. 但它行不通。
My sample image 我的样本图片
And my source code: 和我的源代码:
level2.setOnScrollListener(new OnScrollListener() {
public void onScrollStateChanged(AbsListView view, int scrollState) {
// TODO Auto-generated method stub
}
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
for (int i = 0; i < level2.getChildCount(); i++) {
RelativeLayout relative_layout = (RelativeLayout)level2.getChildAt(i);
TextView textview_1 = (TextView)relative_layout.getChildAt(0);
TextView textview_2 = (TextView)relative_layout.getChildAt(1);
Spinner spinner = (Spinner)relative_layout.getChildAt(2);
spinner.setOnItemSelectedListener(new OnItemSelectedListener() {
public void onItemSelected(AdapterView < ? > arg0,
View arg1, int arg2, long arg3) {
//save my id and spinner selection here in a ArrayList
//Here the position is get value from arraylist
spinner.setSelection(position);
}
public void onNothingSelected(AdapterView < ? > arg0) {
// TODO Auto-generated method stub
}
});
}
}
});
It is not complete code it's just piece. 它不是完整的代码,只是一部分。 Please help me.
请帮我。
在这里,如果您要设置所选项目,则必须使用代码spinner.setSelection(arg2);,由于尚未初始化位置变量,并且其默认值将为0,因此它将始终显示所选的第一项。
I'll solve like this.Try this. 我会这样解决的。 This is just example Activity.
这只是活动示例。
public class MainActivity extends Activity {
SpinnerAdapter ratingAdapter;
ListView listView;
List<String> listString;
ArrayAdapter<String> dataAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listString = new ArrayList<String>();
for(int listCount = 0; listCount < 20 ; listCount++){
listString.add("ListCount"+listCount);
}
List<String> spinnerData = new ArrayList<String>();
for (int i = 0; i < listString.size(); i++) {
spinnerData.add("MyTest="+i);
}
dataAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_expandable_list_item_1, spinnerData);
dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
fillAdapter();
}
private void fillAdapter() {
ratingAdapter = new SpinnerAdapter(getApplicationContext());
listView = (ListView) findViewById(R.id.listView1);
listView.setAdapter(ratingAdapter);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
class ViewHolder {
Spinner spinner;
}
class SpinnerAdapter extends ArrayAdapter {
Context context;
HashMap<Integer,Integer> selectedItems = new HashMap<Integer, Integer>();
public SpinnerAdapter(Context context) {
super(context, R.layout.item_list_spinner_adaoter, listString);
this.context = context;
}
public int getCount() {
return listString.size();
}
public Object getItem(int position) {
return listString.get(position);
}
public long getItemId(int position) {
return position;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
final ViewHolder holder;
if (convertView == null) {
holder = new ViewHolder();
convertView = LayoutInflater.from(context).inflate(R.layout.item_list_spinner_adaoter, null);
holder.spinner = (Spinner) convertView.findViewById(R.id.spinner1);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.spinner.setAdapter(dataAdapter);
if ( selectedItems.get( position ) != null ) {
holder.spinner.setSelection( selectedItems.get( position ) );
}
holder.spinner.setOnItemSelectedListener(new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1,
int arg2, long arg3) {
selectedItems.put( position, arg2 );
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
});
return convertView;
}
}
}
In activity_main.xml: 在activity_main.xml中:
<ListView
android:id="@+id/listView1"
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:stackFromBottom="false"
android:transcriptMode="disabled" >
</ListView>
</LinearLayout>
In item_list_spinner_adaoter.xml: 在item_list_spinner_adaoter.xml中:
<Spinner
android:id="@+id/spinner1"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
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