我一直在寻找一个微调的替代品,因为第一项总是被选中(这会导致我的问题),并且我找到了一些使用AlertDialog和列表的例子。Android SimpleCursorAdapter结果无法显示在AlertDialog
我有两个问题:
清单显示和格式化好的,但也有它没有价值。我知道查询正在返回,并且游标/适配器中包含数据。这个可能是#1的一个症状 - 但是当我选择一个空行时,游标cursor2 =(Cursor)((AdapterView)对话框).getItemAtPosition(which);语句导致崩溃(这是一个ClassCastException)。
我以前有类似的代码将适配器设置为微调对象,并且数据显示正常。
我不认为适配器设置正确,我一直未能拿出解决方案到目前为止。
有什么想法?
谢谢!
btnDenomination.setOnClickListener(new View.OnClickListener()
{
public void onClick(View w)
{
Cursor cursor = coinDB.myDataBase.rawQuery("select _id, denomination_desc from denomination", null); // must select the _id field, but no need to use it
startManagingCursor(cursor); // required in order to use the cursor in
String[] from = new String[] {"denomination_desc" }; // This is the database column name I want to display in the spinner
int[] to = new int[] { R.id.tvDBViewRow }; // This is the TextView object in the spinner
cursor.moveToFirst();
SimpleCursorAdapter adapterDenomination = new SimpleCursorAdapter(CoinsScreen.this,
android.R.layout.simple_spinner_item, cursor, from, to );
adapterDenomination.setDropDownViewResource(R.layout.db_view_row);
new AlertDialog.Builder(CoinsScreen.this)
.setTitle("Select Denomination")
.setAdapter(adapterDenomination, new DialogInterface.OnClickListener()
{
public void onClick(DialogInterface dialog, int which)
{
Cursor cursor2 = (Cursor) ((AdapterView<?>) dialog).getItemAtPosition(which);
strDenomination_id = cursor2.getString(0); // Gets column 1 in a zero based index, the first column is the PKID. this could
// be avoided by using a select AS statement.
Log.d("Item Selected", strDenomination_id);
TextView txtDenomination = (TextView) findViewById(R.id.textDenomination);
txtDenomination.setText(cursor2.getString(1));
dialog.dismiss();
}
}).create().show();
}
});
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout android:id="@+id/LinearLayout01"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android">
<TextView android:text=""
android:id="@+id/tvDBViewRow"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#FF0000" />
</LinearLayout>
好吧,如果我改变:R.id.tvDBViewRow到android.R.id.text1,我看到框中的选择(仍然有第二个问题)。我在单独的XML中使用TextView时所做的是为了对行的外观和感觉有一些控制,当我这样做时会失去这种感觉。它与Spinner一起工作,而不是在对话框中。 –