Android将新光标设置为listView
当用户在Android将新光标设置为listView,android,listview,adapter,Android,Listview,Adapter,当用户在EditText中输入字母时，我对将新的适配器设置为列表视图有点问题。所以，我正在做的事情是，当我的活动第一次启动时，我正在用游标和自定义适配器从数据库填充listView。当用户在EditText中输入一些文本时，我正在创建新的sql语句并使用新的游标获取数据。之后，我将创建新的自定义适配器，并尝试将其设置为我的列表视图 问题是，当我开始键入编辑文本时，我可以在LogCat的日志中看到sql语句是正确的，并且光标大小正确，但是我的ListView没有填充新数据。它保持不变。我是这样做的
EditText适配器列表视图活动第一次启动时，我正在用游标和自定义适配器从数据库填充listView。当用户在EditText中输入一些文本时，我正在创建新的sql语句并使用新的游标获取数据。之后，我将创建新的自定义适配器，并尝试将其设置为我的列表视图
问题是，当我开始键入编辑文本时，我可以在LogCat的日志中看到sql语句是正确的，并且光标大小正确，但是我的ListView没有填充新数据。它保持不变。我是这样做的：
这是我第一次填充listView的方式：
cursor = userDbHelper.executeSQLQuery(sqlQuery);
if (cursor.getCount() == 0) {
noCards.setVisibility(View.VISIBLE);
noCards.setText(getString(R.string.no_cards));
} else if (cursor.getCount() > 0) {
noCards.setVisibility(View.GONE);
for (cursor.move(0); cursor.moveToNext(); cursor.isAfterLast()) {
objectId = Integer.parseInt(cursor.getString(cursor.getColumnIndex("objectId")));
cardId.add(objectId);
title = cursor.getString(cursor.getColumnIndex("title"));
catTitle = cursor.getString(cursor.getColumnIndex("catTitle"));
int repeats = Integer.parseInt(cursor.getString(cursor.getColumnIndex("repeatsCount")));
count.add(repeats);
if(extra != 0){
String cardsm = "SELECT objectId FROM cardmedias "
+ "WHERE cardId="
+ objectId
+ " AND mediaType="
+ 5012;
Cursor cardsM = userDbHelper.executeSQLQuery(cardsm);
if (cardsM.getCount() == 0) {
} else if (cardsM.getCount() > 0) {
for (cardsM.move(0); cardsM.moveToNext(); cardsM.isAfterLast()) {
objectID = Integer.parseInt(cardsM.getString(cardsM.getColumnIndex("objectId")));
String filename = "mediacard-"+objectID;
if(storageID==1){
path = RPCCommunicator.getImagePathFromInternalStorage(servername, userId, filename, this);
} else if(storageID==2){
path = RPCCommunicator.getImagePathFromExternalStorage(servername, userId, filename);
}
hm.put(objectID, path);
path = hm.get(objectID);
Log.i("","path : "+path);
paths.add(path);
names.add(title);
categories.add(catTitle);
}
}
} else if (extra==0){
names.add(title);
categories.add(catTitle);
}
}
}
cursor.close();
adapter = new LazyAdapter(this, paths, names, categories, count);
listView.setAdapter(adapter);
这就是我用TextWatcher
创建新光标和适配器的方法：
searchString = "";
sqlQuery = getSqlQuery(sort, collId, ascDesc,searchString);
searchBar.addTextChangedListener(new TextWatcher() {
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
public void afterTextChanged(Editable s) {
check = 1;
listView.setAdapter(null);
searchString = s.toString();
Log.e("","searchString : "+searchString);
sqlQuery = getSqlQuery(sort, collId, ascDesc,searchString);
Log.e(""," sqlquery : "+sqlQuery);
Cursor cursor = userDbHelper.executeSQLQuery(sqlQuery);
Log.e("","cursor count : "+cursor.getCount());
if (cursor.getCount() == 0) {
noCards.setVisibility(View.VISIBLE);
noCards.setText(getString(R.string.no_cards));
} else if (cursor.getCount() > 0) {
noCards.setVisibility(View.GONE);
for (cursor.move(0); cursor.moveToNext(); cursor.isAfterLast()) {
objectId = Integer.parseInt(cursor.getString(cursor.getColumnIndex("objectId")));
cardId.add(objectId);
title = cursor.getString(cursor.getColumnIndex("title"));
catTitle = cursor.getString(cursor.getColumnIndex("catTitle"));
int repeats = Integer.parseInt(cursor.getString(cursor.getColumnIndex("repeatsCount")));
count.add(repeats);
if(extra != 0){
String cardsm = "SELECT objectId FROM cardmedias "
+ "WHERE cardId="
+ objectId
+ " AND mediaType="
+ 5012;
Cursor cardsM = userDbHelper.executeSQLQuery(cardsm);
if (cardsM.getCount() == 0) {
} else if (cardsM.getCount() > 0) {
for (cardsM.move(0); cardsM.moveToNext(); cardsM.isAfterLast()) {
objectID = Integer.parseInt(cardsM.getString(cardsM.getColumnIndex("objectId")));
String filename = "mediacard-"+objectID;
if(storageID==1){
path = RPCCommunicator.getImagePathFromInternalStorage(servername, userId, filename, OwnedStampii.this);
} else if(storageID==2){
path = RPCCommunicator.getImagePathFromExternalStorage(servername, userId, filename);
}
hm.put(objectID, path);
path = hm.get(objectID);
Log.i("","path : "+path);
paths.add(path);
names.add(title);
categories.add(catTitle);
}
}
} else if (extra==0){
names.add(title);
categories.add(catTitle);
}
}
}
cursor.close();
LazyAdapter adapter = new LazyAdapter(OwnedStampii.this, paths, names, categories, count);
listView.setAdapter(adapter);
}
});
那么，我该如何使用新适配器刷新列表视图呢。我已经尝试使用适配器.notifySetDataChanged（）并且它不工作
提前谢谢 我修复了这个问题，在我的PostTextChanged（）
中，我只是清除用于存储数据并将新数据放在其上的ArrayList。清除数据源在这种情况下是路径、名称、类别和计数。
将新结果加载到列表的数据源中（路径、名称、类别、计数），并将列表适配器设置为null，然后调用notifyDataSetChanged