当我使用 a 的列表视图BaseAdapter离开屏幕时，每一行不再保持连续的位置。除了这个，我不知道还能怎么解释。
如果我的 BA/LV 在屏幕上显示 4 个项目，并且我添加了一个显示每一行的 TextView 的视图，它会显示 0、1、2、3 的行号（这是正确的）。但是，一旦我将列表向下滚动到底部的 4 项（第 5-8 项），它就会显示为 4,5,0,1?? 为什么？
编辑： 我确实发现如果我改变
rv = (RowView) convertView;
到
rv = new RowView(mContext,(cursor.getString(2)),
(cursor.getString(5)),
cursor.getString(cursor.getColumnIndex(DBHelper.KEY_IMAGEFILENAME)),
cursor.getString(cursor.getColumnIndex(DBHelper.KEY_CITY)),position);
它可以工作，但是它没有重新使用代码。所以，我想我是在正确的轨道上。我确实尝试了一些方便的方法，但这对我没有太大帮助，因为我需要在构造函数触发之前设置这些值。我是否需要创建一个新方法并在最后触发它？比如addRow方法？这也导致它滚动非常慢。
@Override
public void onCreate(Bundle bundle)
{
super.onCreate(bundle);
//setContentView(R.layout.findlist);
//getListView().setEmptyView(findViewById(R.id.empty));
mDbHelper = new DBHelper(this);
mDbHelper.open();
cursor = mDbHelper.fetchAllLocations();
startManagingCursor(cursor);
mAdapter = new myListAdapter(this);
setListAdapter(mAdapter);
}
public class myListAdapter extends BaseAdapter {
public String testing;
public myListAdapter(Context c) {
mContext = c;
// TODO Auto-generated constructor stub
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return cursor.getCount();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
cursor.moveToPosition(position);
RowView rv;
if (convertView == null) {
rv = new RowView(mContext,(cursor.getString(2)),
(cursor.getString(5)),
cursor.getString(cursor.getColumnIndex(DBHelper.KEY_IMAGEFILENAME)),
cursor.getString(cursor.getColumnIndex(DBHelper.KEY_CITY)),position);
} else {
rv = (RowView) convertView;
try {
// I KNOW THIS SECTION IS NOT RIGHT, BUT I HAVE BEEN MESSING IN HERE
rv.setAddress(cursor.getString(2));
rv.setCity(cursor.getString(5));
rv.setFocusable(true);
rv.setClickable(true); }
catch (Exception e) {
rv = (RowView) convertView;
rv.setAddress(cursor.getString(2));
rv.setCity(cursor.getString(5));
rv.setFocusable(true);
rv.setClickable(true);
Toast mToast;
mToast = Toast.makeText(FindList.this, "Error :" + e.toString() ,
Toast.LENGTH_LONG);
mToast.show();
}
}
return rv;
}
public void addItems() {
//String[] from = new String[] { DBHelper.KEY_BUSINESSNAME, DBHelper.KEY_ADDRESS, DBHelper.KEY_CITY, DBHelper.KEY_GPSLONG, DBHelper.KEY_GPSLAT, DBHelper.KEY_IMAGEFILENAME + ""};
// create array of values of widgits
//to = new int[] { R.id.businessname, R.id.address, R.id.city, R.id.gpslong, R.id.gpslat, R.id.preview};
// Now create an array adapter and set it to display using our row from notes_row.xml
}
}
private class RowView extends LinearLayout {
private TextView mAddress;
private TextView mCity;
public ImageView mArrow;
public ImageView mPicture;
public String mPathName;
public String mDateTime;
public RowView(Context context, String title, String words, String pathName, String city, int position) {
super(context);
this.setOrientation(HORIZONTAL);
this.setVerticalGravity(16); //CENTER_VERTICAL
// Here we build the child views in code. They could also have
// been specified in an XML file.
//DISPLAY DELETE BUTTON
Button mButton = new Button(context);
mButton.setFocusable(false);
mButton.setId(position);
mButton.setBackgroundResource(R.drawable.delete3);
addView(mButton, new LinearLayout.LayoutParams(
LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
TextView mTitle;
mTitle = new TextView(context);
mTitle.setText(Integer.toString(position));
addView(mTitle, new LinearLayout.LayoutParams(
LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
this.setOrientation(HORIZONTAL);
try {
Bitmap bm = Bitmap.createScaledBitmap(BitmapFactory.decodeFile(cursor.getString(cursor.getColumnIndex(DBHelper.KEY_IMAGEFILENAME))),100, 100, true);
mPicture = new ImageView(context);
mPicture.setImageBitmap(bm);
} catch (Exception e) {
mPicture = new ImageView(context);
mPicture.setImageResource(R.drawable.noimage);
}
addView(mPicture, new LinearLayout.LayoutParams(
LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
mArrow = new ImageView(context);
mArrow.setBackgroundResource(R.drawable.arrowleft3);
addView(mArrow, new LinearLayout.LayoutParams(
LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
currentPosition = position;
Button button = (Button)findViewById(position);
button.setOnClickListener(mCorkyListener);
}