问题
I was wondering how to set a number starting from 1 to n for my listview items. The column is not included in my sqllite database.
I would like to use a custom simple cursor adapter that has a textview called labelNumber and set the number to 1 on the first call to newView and bindview and increment the value after each call.
Is this the right approach or is there a better way. Obviously this is to help with the navigation of the list view to know your current position?
Update- code is working check comments below
public class ProgressAdapter extends SimpleCursorAdapter {
private Context context;
private int layout;
private ViewHolder viewHolder;
// create an integer to use as a number holder
private int n;
static class ViewHolder {
public TextView number;
public TextView setsText;
public TextView repsText;
public TextView weightText;
public TextView completeText;
public ImageView mgImage;
}
public ProgressAdapter(Activity context, int layout, Cursor c,
String[] from, int[] to) {
super(context, layout, c, from, to);
this.context = context;
this.layout = layout;
}
@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
Cursor c = getCursor();
viewHolder = new ViewHolder();
final LayoutInflater inflater = LayoutInflater.from(context);
View v = inflater.inflate(layout, parent, false);
// get the number using the cursor position
// add 1 to the int to start at 1 instead of 0
n = c.getPosition()+ 1;
String lineNumber = Integer.toString(n);
int setsColumn = c.getColumnIndex(ExerciseDbAdapter.KEY_SETS);
String sets = c.getString(setsColumn);
int repsColumn = c.getColumnIndex(ExerciseDbAdapter.KEY_REPS);
String reps = c.getString(repsColumn);
int weightColumn = c.getColumnIndex(ExerciseDbAdapter.KEY_WEIGHT);
String weight = c.getString(weightColumn);
viewHolder.number = (TextView) v.findViewById(R.id.labelNumber);
viewHolder.setsText = (TextView) v.findViewById(R.id.labelSets);
viewHolder.repsText = (TextView) v.findViewById(R.id.labelReps);
viewHolder.weightText = (TextView) v.findViewById(R.id.labelWeight);
if ( viewHolder.setsText != null && viewHolder.repsText != null
&& viewHolder.weightText != null
) {
viewHolder.number.setText(lineNumber);
viewHolder.setsText.setText(sets);
viewHolder.repsText.setText(reps);
viewHolder.weightText.setText(weight);
}
return v;
}
@Override
public void bindView(View v, Context context, Cursor c) {
viewHolder = new ViewHolder();
// use cursor to get the integer and add 1 to position
c = getCursor();
n = c.getPosition()+ 1;
String lineNumber = Integer.toString(n);
int setsColumn = c.getColumnIndex(ExerciseDbAdapter.KEY_SETS);
String sets = c.getString(setsColumn);
int repsColumn = c.getColumnIndex(ExerciseDbAdapter.KEY_REPS);
String reps = c.getString(repsColumn);
int weightColumn = c.getColumnIndex(ExerciseDbAdapter.KEY_WEIGHT);
String weight = c.getString(weightColumn);
// set the fields for the view
viewHolder.number = (TextView) v.findViewById(R.id.labelNumber);
viewHolder.setsText = (TextView) v.findViewById(R.id.labelSets);
viewHolder.repsText = (TextView) v.findViewById(R.id.labelReps);
viewHolder.weightText = (TextView) v.findViewById(R.id.labelWeight);
if (viewHolder.setsText != null && viewHolder.repsText != null
&& viewHolder.weightText != null
) {
viewHolder.number.setText(lineNumber);
viewHolder.setsText.setText(sets);
viewHolder.repsText.setText(reps);
viewHolder.weightText.setText(weight);
}
}
}
回答1:
public class ProgressAdapter extends SimpleCursorAdapter {
private Context context;
private int layout;
private ViewHolder viewHolder;
// create an integer to use as a number holder
private int n;
static class ViewHolder {
public TextView number;
public TextView setsText;
public TextView repsText;
public TextView weightText;
public TextView completeText;
public ImageView mgImage;
}
public ProgressAdapter(Activity context, int layout, Cursor c,
String[] from, int[] to) {
super(context, layout, c, from, to);
this.context = context;
this.layout = layout;
}
@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
Cursor c = getCursor();
viewHolder = new ViewHolder();
final LayoutInflater inflater = LayoutInflater.from(context);
View v = inflater.inflate(layout, parent, false);
// get the number using the cursor position
n = c.getPosition();
// add 1 to the int to start at 1 instead of 0
n = n+1;
int setsColumn = c.getColumnIndex(ExerciseDbAdapter.KEY_SETS);
String sets = c.getString(setsColumn);
int repsColumn = c.getColumnIndex(ExerciseDbAdapter.KEY_REPS);
String reps = c.getString(repsColumn);
int weightColumn = c.getColumnIndex(ExerciseDbAdapter.KEY_WEIGHT);
String weight = c.getString(weightColumn);
viewHolder.number = (TextView) v.findViewById(R.id.labelNumber);
viewHolder.setsText = (TextView) v.findViewById(R.id.labelSets);
viewHolder.repsText = (TextView) v.findViewById(R.id.labelReps);
viewHolder.weightText = (TextView) v.findViewById(R.id.labelWeight);
if ( viewHolder.setsText != null && viewHolder.repsText != null
&& viewHolder.weightText != null
) {
viewHolder.number.setText(n+"");
viewHolder.setsText.setText(sets);
viewHolder.repsText.setText(reps);
viewHolder.weightText.setText(weight);
}
return v;
}
@Override
public void bindView(View v, Context context, Cursor c) {
viewHolder = new ViewHolder();
// use cursor to get the integer
c = getCursor();
n = c.getPosition();
// add one to the value to start at 1 instead of 0
n = n+1;
int setsColumn = c.getColumnIndex(ExerciseDbAdapter.KEY_SETS);
String sets = c.getString(setsColumn);
int repsColumn = c.getColumnIndex(ExerciseDbAdapter.KEY_REPS);
String reps = c.getString(repsColumn);
int weightColumn = c.getColumnIndex(ExerciseDbAdapter.KEY_WEIGHT);
String weight = c.getString(weightColumn);
// set the fields for the view
viewHolder.number = (TextView) v.findViewById(R.id.labelNumber);
viewHolder.setsText = (TextView) v.findViewById(R.id.labelSets);
viewHolder.repsText = (TextView) v.findViewById(R.id.labelReps);
viewHolder.weightText = (TextView) v.findViewById(R.id.labelWeight);
if (viewHolder.setsText != null && viewHolder.repsText != null
&& viewHolder.weightText != null
) {
viewHolder.number.setText(n+"");
viewHolder.setsText.setText(sets);
viewHolder.repsText.setText(reps);
viewHolder.weightText.setText(weight);
}
}
}
回答2:
Try to override getview..,.
@Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater=(LayoutInflater)appContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView=inflater.inflate(layout, null, true);
EditText txt=(EditText)convertView.findViewById(R.id.labelNumber);
txt.settext(position + 1); //position starts from 0 thats why add 1
return convertView;
}
回答3:
public class myAdapter extends SimpleCursorAdapter {
// globle variable
public myAdapter() {
//constructor
}
@Override
public int getCount() {
return 0;
}
@Override
public Object getItem(int arg0) {
return null;
}
@Override
public long getItemId(int arg0) {
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater=(LayoutInflater)appContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView=inflater.inflate(layout, null, true);
EditText txt=(EditText)convertView.findViewById(R.id.labelNumber);
txt.settext(position + 1); //position starts from 0 thats why add 1
return convertView;
}
}
This is full simple cursor adapter..,.
来源:https://stackoverflow.com/questions/13179876/how-to-number-items-in-a-list-view