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我有一個列表視圖需要多項選擇(即每個列表項都有一個複選框,可以選中/不選中) 列表視圖位於tabhost中,是內容第一個標籤。Android CheckedTextView - 點擊更改檢查狀態
我的設立是像這樣:
我的選項卡設置了:
TabSpec tab = tabHost.newTabSpec("Services");
tabHost.addTab(tabHost.newTabSpec("tab_test1").setIndicator("Services").setContent(new Intent(this, ServiceList.class)));
當標籤被點擊新活動ServiceList開始
ServiceList的定義是這樣的:
public class ServiceList extends ListActivity{
private EscarApplication application;
ListView listView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.service_list);
ServiceList.this.application = (EscarApplication) this.getApplication();
final ListView listView = getListView();
}
protected void onListItemClick(ListView l, View v, int position, long id) {
String.valueOf(id);
Long.toString(id);
((CheckedTextView) v).setChecked(true);
super.onListItemClick(l, v, position, id);
}
@Override
public void onStart() {
super.onStart();
//Generate and display the List of visits for this day by calling the AsyncTask
GenerateServiceList services = new GenerateServiceList();
int id = ServiceList.this.application.getVisitId();
services.execute(id);
listView = getListView();
listView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
}
//The AsyncTask to generate a list
private class GenerateServiceList extends AsyncTask<Integer, String, Cursor> {
// can use UI thread here
protected void onPreExecute() {
}
// automatically done on worker thread (separate from UI thread)
protected Cursor doInBackground(Integer...params) {
int client_id = params[0];
ServiceList.this.application.getServicesHelper().open();
Cursor cur = ServiceList.this.application.getServicesHelper().getPotentialVisitServices(client_id);
return cur;
}
// can use UI thread here
protected void onPostExecute(Cursor cur){
startManagingCursor(cur);
// the desired columns to be bound
String[] columns = new String[] {ServicesAdapter.KEY_SERVICE};
// the XML defined views which the data will be bound to
int[] to = new int[] {R.id.display_service};
SimpleCursorAdapter mAdapter = new SimpleCursorAdapter(ServiceList.this, R.layout.service_list_element, cur, columns, to);
// set this adapter as your ListActivity's adapter
ServiceList.this.setListAdapter(mAdapter);
ServiceList.this.application.getServicesHelper().close();
}
}
}
所以,一切正常,直到我點擊我的列表項目更改複選框狀態。
設置爲處理單擊事件格蘭代碼的部分引起了我的問題:
protected void onListItemClick(ListView l, View v, int position, long id) {
String.valueOf(id);
Long.toString(id);
((CheckedTextView) v).setChecked(true);
super.onListItemClick(l, v, position, id);
}
我的理解是,視圖V傳遞給onListItemClick方法reperesents我的列表元素,所以我想投v作爲CheckedTextView並將檢查值設置爲true,但是這隻會導致我的應用程序崩潰。我在這裏錯過簡單的東西,還是有更簡單的方法來做到這一點?
感謝
凱文
可以顯示崩潰的確切堆棧跟蹤或logcat輸出嗎? – 2010-08-23 17:24:41