在我的应用程序中有一个listview。当用户点击一个项目时,会出现一个alertdialog。用户从对话框中选择项目“删除”,并从列表视图中删除项目。问题是,我的代码中listview的位置始终为空,所以remove命令非常奇怪。在下面的代码中,当用户在Alert对话框中单击Delete时,文件的行被读入一个数组中,并且我想删除在listview中选择的项目。为此,我使用onitemclick()的位置变量。Android listview item position
lv1.setOnItemClickListener(new OnItemClickListener()
{
@Override
public void onItemClick(AdapterView<?> a, View v, final int position, long id) {
Object o = lv1.getItemAtPosition(position);
keyword = o.toString();
AlertDialog.Builder builder2 = new AlertDialog.Builder(Bind.this);
builder2.setTitle("Select");
final CharSequence[] selection2 = select.toArray(new CharSequence[valasztas.size()]);
builder2.setItems(selection2, new DialogInterface.OnClickListener()
{
public void onClick(DialogInterface dialog, int item2)
{
if (selection2[item2].equals("Delete"))
{
try {
File rootdir = Environment.getExternalStorageDirectory();
File yourFile = new File(rootdir, "tomato50.txt");
FileReader filereader = new FileReader(yourFile);
BufferedReader br = new BufferedReader(filereader);
String line;
while((line = br.readLine()) != null)
{
assignArrT.add(line);
}
br.close();
}
catch (IOException e)
{
e.printStackTrace();
}
assignArrT.remove(position); //this is null
assignArrT在该行中为空,请检查原因。 – Egor 2011-06-06 17:47:31