我在Spinners中的ListView有问题。我有一个带有ListView，标签和两个CheckBox的Spinners。 Spinner是从SQLite填充的，并且工作正常。我没有使用ViewHolder方法，因为到目前为止，当单击ListView行时，已选中或未选中CheckBoxes，并且更改立即保存到数据库中。选中该行后，Spinners变为可见，但未选中该行时不可见。
因此，我一直没有找到解决方案的问题是，我不知道如何获取实际的Spinner甚至获取单击的ListItem所在的Spinner行。 Activity扩展ListActivity。有人知道不使用ViewHolder就可以做到这一点的方法吗？还是必须使用ViewHolder？
这是声明并填充ListView的代码：
mSsCursor = mDbHelper.fetchAllSsPlaylistSs(mPlId);
startManagingCursor(mSsCursor);
String[] from = new String[]{"pl_selected", BTDbAdapter.KEY_NAME, BTDbAdapter.KEY_NAME2};
int[] to = new int[]{R.id.pl_selected, R.id.name, R.id.name2};
mAllSs = new SimpleCursorAdapter(this, R.layout.pl_edit_ss_row, mSsCursor, from, to);
mAllSs.setViewBinder(new SimpleCursorAdapter.ViewBinder() {
//custom handling of setting the value
public boolean setViewValue(View view, Cursor cursor, int columnIndex) {
if(columnIndex == 3) {
ViewGroup row = (ViewGroup)view.getParent().getParent();
mSId = cursor.getInt(0);
if (cursor.getInt(3) > 0) {
mCheckBox = (CheckBox) row.findViewById(R.id.pl_selected);
mCheckBox.setChecked(true);
mTSpin = (Spinner) row.findViewById(R.id.pl_t_spin);
mMSpin = (Spinner) row.findViewById(R.id.pl_m_spin);
mtvT = (TextView) row.findViewById(R.id.pl_t);
mtvM = (TextView) row.findViewById(R.id.pl_m);
mTSpin.setVisibility(View.VISIBLE);
mtvT.setVisibility(View.VISIBLE);
mMSpin.setVisibility(View.VISIBLE);
mtvM.setVisibility(View.VISIBLE);
//set the values in the t spinner
PopulateTSpinner(cursor.getInt(4));
//set the values in the m spinner
PopulateMSpinner(cursor.getInt(5));
}
else {
mCheckBox = (CheckBox) row.findViewById(R.id.pl_selected);
mCheckBox.setChecked(false);
mTSpin = (Spinner) row.findViewById(R.id.pl_t_spin);
mMSpin = (Spinner) row.findViewById(R.id.pl_m_spin);
mtvT = (TextView) row.findViewById(R.id.pl_t);
mtvM = (TextView) row.findViewById(R.id.pl_m);
mTSpin.setVisibility(View.GONE);
mtvT.setVisibility(View.GONE);
mMSpin.setVisibility(View.GONE);
mtvM.setVisibility(View.GONE);
}
return true;
}
return false;
}
});
setListAdapter(mAllSs);
谢谢。
最佳答案
我不知道我是否理解您的问题：如果您的应用程序流程是：
显示数据列表（CheckBox + TextView（Spinners隐藏））->
用户单击一行（该行的Spinners出现（包含）（单个）数据）->
用户选择那些Spinners->中的内容
将该选择保存在数据库中
那么我认为您应该使用自定义适配器，并注意行创建+数据绑定（我不知道如何为Spinners设置侦听器）。以下是一个有关如何执行此操作的小示例（尽管可能不是一个很好的方法）：
public class CustomAdapter extends SimpleCursorAdapter {
private LayoutInflater mInflater;
public CustomAdapter(Context context, int layout, Cursor c,
String[] from, int[] to) {
super(context, layout, c, from, to);
mInflater = LayoutInflater.from(context);
}
@Override
public void bindView(View view, Context context, Cursor cursor) {
ViewHolder holder = (ViewHolder) view.getTag(); // the holder
// pattern
// set the text for the TextView in your row
holder.name
.setText(cursor.getString(cursor.getColumnIndex("name")));
// status of the CheckBox from the database
int status = cursor.getInt(cursor.getColumnIndex("pl_selected"));
// set the CheckBox status
holder.ckb.setChecked((status > 0) ? true : false);
// get the id of this particular row, we'll use this later in the
// Spinner's listeners
long theId = cursor.getLong(cursor.getColumnIndex("_id"));
// see if it is time to show the Spinners
if (status > 0) {
// it is time to show the Spinners. Here you would do stuff
// like: setting up the Spinner's adapters + setting the
// listener
// I used a Spinner with entries set in the xml layout(so my
// selection result is a String)
holder.spin1.setVisibility(View.VISIBLE);
holder.spin2.setVisibility(View.VISIBLE);
// set theId as a tag so you know which Spinner was acted on
holder.spin1.setTag(new Long(theId));
holder.spin1
.setOnItemSelectedListener(new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent,
View view, int position, long id) {
Long realRowId = (Long) parent.getTag();
// I don't know
ContentValues cv = new ContentValues();
// the column where I saved the spinner selected
// item is called "saved_item"
cv.put("saved_item", (String) parent
.getItemAtPosition(position));
// mDb is my SQLiteDatabase instance
mDb.update("tbl", cv, "_id = ?",
new String[] { String
.valueOf(realRowId) });
// I don't know how you saved the data, the
// above is just an example
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
// also implement the second Spinner like the first one
} else {
// required to prevent a recycled View from causing damage
holder.spin1.setVisibility(View.GONE);
holder.spin2.setVisibility(View.GONE);
}
}
@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
View v = mInflater.inflate(R.layout.adapters_listspinner_row,
parent, false);
ViewHolder holder = new ViewHolder();
holder.spin1 = (Spinner) v.findViewById(R.id.spinner1);
holder.spin1.setFocusable(false);
holder.spin2 = (Spinner) v.findViewById(R.id.spinner2);
holder.spin2.setFocusable(false);
holder.name = (TextView) v.findViewById(R.id.textView1);
holder.ckb = (CheckBox) v.findViewById(R.id.checkBox1);
holder.ckb.setFocusable(false);
v.setTag(holder);
return v;
}
class ViewHolder {
Spinner spin1, spin2;
TextView name;
CheckBox ckb;
}
}
另外，必需的
onListItemcClick方法：@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
// manage the CheckBox state
CheckBox ckb = (CheckBox) v.findViewById(R.id.checkBox1);
ckb.setChecked(!ckb.isChecked());
ContentValues cv = new ContentValues();
cv.put("pl_selected", ckb.isChecked() ? 1 : 0);
mDb.update("tbl", cv, "_id = ?",
new String[] { String.valueOf(id) });
// requery the database so the changes are seen by the adapter, this is horrible!
Cursor re = mDb.query("tbl", null, null, null, null, null, null);
mAllSs.changeCursor(re);
}
作为建议，也许您可以修改应用程序的布局并将
Spinners移出ListView行。关于android - ListView中的Android Spinners，我必须使用ViewHolder吗？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/10816765/