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私はsimplecursoradapterを拡張するアダプタを持っています。新しいビューでは、画像とともにデータベースからカーソルを取得し、いくつかのチェックボックスを使用してリストを作成します。何らかの理由で私が見ることができない、私のgetViewは呼び出されていない。 getView内にブレークポイントがあり、そこには決して到達せず、リストは空のままになります。 誰もがスルーを見て、私が間違ってgetViewは呼び出されませんか？
public class TakeStudentAttendance extends ListActivity {
private gradeBookDbAdapter mDbHelper;
private Long mRowId;
private TextView mNameText;
private String classname;
private Boolean new_attendance = false;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Cursor stud;
mDbHelper = new gradeBookDbAdapter(this);
mDbHelper.open();
mRowId = (savedInstanceState == null) ? null
: (Long) savedInstanceState
.getSerializable(gradeBookDbAdapter.KEY_ROWID);
if (mRowId == null) {
Bundle extras = getIntent().getExtras();
mRowId = extras != null ? extras
.getLong(gradeBookDbAdapter.KEY_ROWID) : null;
}
// pull in class data
stud = mDbHelper.fetchClass(mRowId);
startManagingCursor(stud);
classname = stud.getString(
stud.getColumnIndexOrThrow(gradeBookDbAdapter.KEY_CLASSNAME));
String title = "Attendance for " + classname;
setTitle(title);
setContentView(R.layout.attendance_list);
Button doneButton = (Button) findViewById(R.id.Done);
doneButton.setOnClickListener(mAttendanceActivity);
// check previous attendance date
String prevdate = stud.getString(
stud.getColumnIndexOrThrow(gradeBookDbAdapter.KEY_PREVDATE));
stud = mDbHelper.fetchAttendanceByClass(mRowId); // this query yields _id, name,
// attend, late, dtime
if (mDbHelper.getClassDate() == prevdate){
// previous date is the same, so we're doing attendance again: retain values
new_attendance = false;
}
else {
// dates are different, so we're starting from scratch and all students are
// absent until counted present. I just need names and will populate attendance
new_attendance = true;
// upon attendance start-up, NO ONE is present. Set all entries in DB to not present (0)
setNoAttend(stud, mRowId);
// reset cursor position
stud.moveToFirst();
}
// Create an array to specify the fields we want to display in the list
String[] from = new String[]{gradeBookDbAdapter.KEY_NAME,
gradeBookDbAdapter.KEY_ROWID,
gradeBookDbAdapter.KEY_ATTEND,
gradeBookDbAdapter.KEY_LATE,
gradeBookDbAdapter.KEY_DTIME};
// and an array of the fields we want to bind those fields to (in this case just text1)
int[] to = new int[]{R.id.stuname,
R.id.stuIndex,
R.id.attend,
R.id.late,
R.id.stuIndex};
// Now create a simple cursor adapter and set it to display
// mRowId holds the class index.
MyDataAdapter studs =
new MyDataAdapter(this, R.layout.show_attendance, stud, from, to, mRowId, new_attendance);
setListAdapter(studs);
}
をやったかを見ることができますここに私のアダプタのコードは次のとおりです。
public class MyDataAdapter extends SimpleCursorAdapter {
private Cursor c;
private Context context;
private Long classnum;
private gradeBookDbAdapter mDbHelper;
private Boolean newValues;
private ArrayList<String> list = new ArrayList<String>();
private ArrayList<Boolean> itemCheckedHere = new ArrayList<Boolean>();
private ArrayList<Boolean> itemCheckedLate = new ArrayList<Boolean>();
private ArrayList<Integer> itemCheckedIdx = new ArrayList<Integer>();
int idxCol;
int idx;
// itemChecked will store the position of the checked items.
public MyDataAdapter(Context context, int layout, Cursor c, String[] from,
int[] to, Long mRowId, Boolean new_attendance) {
super(context, layout, c, from, to);
this.c = c;
this.context = context;
mDbHelper = new gradeBookDbAdapter(context);
mDbHelper.open();
classnum = mRowId;
newValues = new_attendance;
c.moveToFirst();
for (int i = 0; i < c.getCount(); i++) {
itemCheckedHere.add(i, false); // initializes all items value with false
itemCheckedLate.add(i, false); // initializes all items value with false
}
}
public View getView(final int pos, View inView, ViewGroup parent) {
File file;
ImageView studentPhoto;
if (inView == null) {
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
inView = inflater.inflate(R.layout.show_attendance, null);
}
// set up name field
final TextView studentName = (TextView) inView.findViewById(R.id.stuname);
final TextView studentIndex = (TextView) inView.findViewById(R.id.stuIndex);
if (studentName != null)
{
c.moveToPosition(pos);
int index = c.getColumnIndex(gradeBookDbAdapter.KEY_NAME);
String name = c.getString(index);
studentName.setText(name);
index = c.getColumnIndex(gradeBookDbAdapter.KEY_STUDENT);
String Index = c.getString(index);
studentIndex.setText(Index);
// set up photo icon
file = new File(Environment.getExternalStorageDirectory() +
"/gradeBook/" + name + ".jpg");
studentPhoto = (ImageView) inView.findViewById(R.id.icon);
if (file.exists()) {
String fileName = file.getAbsolutePath();
BitmapFactory.Options opts = new BitmapFactory.Options();
Bitmap bm;
bm = BitmapFactory.decodeFile(fileName, opts);
studentPhoto.setImageBitmap(bm);
}
else {
// use icon image
studentPhoto.setImageResource(R.drawable.person_icon);
}
}
final CheckBox cBoxH = (CheckBox) inView.findViewById(R.id.attend);
final CheckBox cBoxL = (CheckBox) inView.findViewById(R.id.late);
cBoxH.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
CheckBox cb = (CheckBox) v.findViewById(R.id.attend);
if (cb.isChecked()) {
itemCheckedHere.set(pos, true);
int Index = new Integer(studentIndex.getText().toString());
mDbHelper.insertAttend(Index, classnum, 1);
} else if (!cb.isChecked()) {
itemCheckedHere.set(pos, false);
int Index = new Integer(studentIndex.getText().toString());
mDbHelper.deleteAttend(Index, classnum);
}
}
});
cBoxL.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
CheckBox cb = (CheckBox) v.findViewById(R.id.late);
if (cb.isChecked()) {
itemCheckedLate.set(pos, true);
// do some operations here
} else if (!cb.isChecked()) {
itemCheckedLate.set(pos, false);
// do some operations here
}
}
});
cBoxH.setChecked(itemCheckedHere.get(pos)); // this will Check or Uncheck the
cBoxL.setChecked(itemCheckedLate.get(pos)); // this will Check or Uncheck the
// CheckBox in ListView
// according to their original
// position and CheckBox never
// loss his State when you
// Scroll the List Items.
return inView;
}
}
アダプタでgetCount（）を呼び出すと、0が返されますか？ – Gregory
Grrr ...それです！私の質問は空ではないときに空に戻ります。穴を見つけてくれてありがとう:) – Martin