[英]set onClickListener for spinner item?
我有從數據庫填充的微調器:
catSpinner = (Spinner) findViewById(R.id.spinner1);
cursor = dataAdapter.getAllCategory();
startManagingCursor(cursor);
String[] from = new String[] { DataAdapter.CATEGORY_COL_NAME };
int[] to = new int[] { android.R.id.text1 };
SimpleCursorAdapter catAdapter = new SimpleCursorAdapter(this,
android.R.layout.simple_spinner_dropdown_item, cursor, from,to, 0);
catAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
catAdapter.notifyDataSetChanged();
catSpinner.setAdapter(catAdapter);
當我選擇最后一項( Add new category...
)時,我想調用AlertDialog
。
添加新類別后,我希望“項目( Add new category...
)”再次成為最后一個。
我怎么能做到這一點?
您不應該在微調器上調用OnItemClickListener
。 Spinner 不支持項目點擊事件。 調用此方法將引發異常。 檢查這個。
您可以改為應用OnItemSelectedListener
。
編輯 :
spinner.setOnItemSelectedListener(new OnItemSelectedListener()
{
public void onItemSelected(AdapterView<?> parent, View view, int position, long id)
{
String selectedItem = parent.getItemAtPosition(position).toString();
if(selectedItem.equals("Add new category"))
{
// do your stuff
}
} // to close the onItemSelected
public void onNothingSelected(AdapterView<?> parent)
{
}
});
就在列表末尾添加“添加新類別”而言,我認為您最好選擇自定義適配器,在添加所有項目后,您可以將該常量(“添加新類別”)添加到末尾數組,以便它應該始終排在最后。
掛鈎到 Spinner 的 OnItemClickListener。 然后檢查所選項目是否為“添加新類別”。
如果是,則顯示對話框以添加新項目。
在添加新項目時,
這將使“添加新類別”項目成為最后一項。
代碼示例:
布局 main.xml :
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:weightSum="10" >
<Spinner
android:id="@+id/cmbNames"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
布局 spinner_item.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/tvName"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
活動類:
public class MainActivity extends Activity {
private static final String NAME = "name";
private static final String ADD_NEW_ITEM = "Add New Item";
private SimpleAdapter adapter;
private Spinner cmbNames;
private List<HashMap<String, String>> lstNames;
private int counter;
private OnItemSelectedListener itemSelectedListener = new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
HashMap<String, String> map = lstNames.get(arg2);
String name = map.get(NAME);
if (name.equalsIgnoreCase(ADD_NEW_ITEM)) {
lstNames.remove(map);
counter++;
addNewName(String.valueOf(counter));
addNewName(ADD_NEW_ITEM);
adapter.notifyDataSetChanged();
}
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
populateList();
cmbNames = (Spinner) findViewById(R.id.cmbNames);
adapter = new SimpleAdapter(this, lstNames, R.layout.spinner_item,
new String[] { NAME }, new int[] { R.id.tvName });
cmbNames.setAdapter(adapter);
cmbNames.setOnItemSelectedListener(itemSelectedListener);
}
private void populateList() {
lstNames = new ArrayList<HashMap<String, String>>();
addNewName("abc");
addNewName("pqr");
addNewName("xyz");
addNewName(ADD_NEW_ITEM);
}
private void addNewName(String name) {
HashMap<String, String> map = new HashMap<String, String>();
map.put(NAME, name);
lstNames.add(map);
}
}
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.