getView没有得到叫什么名字？ [英] getView not getting called?
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问题描述
我有延伸simplecursoradapter的适配器。新的观点是应该采取从数据库游标与图像一起，填充列表与一对夫妇的复选框。出于某种原因，我似乎无法看到，我的getView甚至没有被调用。我有内部getView一个断点，它永远不会到达那里，并只需在列表中显示了空。
任何人都可以看看直通，看看我做错了。
公共类TakeStudentAttendance扩展ListActivity {
私人gradeBookDbAdapter mDbHelper;
私人长期mRowId;
私人TextView的mNameText;
私人字符串类名;
私人布尔new_attendance = FALSE;@覆盖
公共无效的onCreate（捆绑savedInstanceState）{
super.onCreate（savedInstanceState）;
光标螺栓; mDbHelper =新gradeBookDbAdapter（本）;
mDbHelper.open（）;
mRowId =（savedInstanceState == NULL）？空值
（龙）savedInstanceState
.getSerializable（gradeBookDbAdapter.KEY_ROWID）;
如果（mRowId == NULL）{
捆绑额外= getIntent（）getExtras（）。
mRowId =临时演员！= NULL？演员
.getLong（gradeBookDbAdapter.KEY_ROWID）：空;
}
//拉类数据
螺柱= mDbHelper.fetchClass（mRowId）;
startManagingCursor（螺栓）; 类名= stud.getString（
stud.getColumnIndexOrThrow（gradeBookDbAdapter.KEY_CLASSNAME））;
字符串title =考勤+类名;
的setTitle（职称）; 的setContentView（R.layout.attendance_list）;
按钮doneButton =（按钮）findViewById（R.id.Done）;
doneButton.setOnClickListener（mAttendanceActivity）; //检查previous起止日期
字符串prevdate = stud.getString（
stud.getColumnIndexOrThrow（gradeBookDbAdapter.KEY_ preVDATE））; 螺柱= mDbHelper.fetchAttendanceByClass（mRowId）; //这个查询产量_id，姓名，
//出席，迟到，DTIME 如果（mDbHelper.getClassDate（）== prevdate）{
// previous日期是一样的，所以我们又来考勤：保留值
new_attendance = FALSE;
}
其他{
//日期是不同的，所以我们从头开始，所有学生都
//缺席，直到数present。我只需要姓名和将填充出席
new_attendance = TRUE;
//在出席启动，没有一个是present。坐落在数据库中的所有条目不present（0）
setNoAttend（螺栓，mRowId）;
//重新设置光标位置
stud.moveToFirst（）;
} //创建一个数组来指定，我们要在列表中显示的字段
的String [] =由新的String [] {gradeBookDbAdapter.KEY_NAME，
gradeBookDbAdapter.KEY_ROWID，
gradeBookDbAdapter.KEY_ATTEND，
gradeBookDbAdapter.KEY_LATE，
gradeBookDbAdapter.KEY_DTIME}; //我们希望这些字段绑定到域的阵列（在此情况下，仅有文本1）
INT []为= INT新[] {R.id.stuname，
R.id.stuIndex，
R.id.attend，
R.id.late，
R.id.stuIndex}; //现在创建一个简单的游标适配器，并将其设置为显示
// mRowId持有类指数。
MyDataAdapter螺栓=
新MyDataAdapter（这一点，R.layout.show_attendance，螺柱，发件人，收件人，mRowId，new_attendance）;
setListAdapter（螺栓）;
}
下面是我的适配器code：
公共类MyDataAdapter扩展SimpleCursorAdapter {
私人光标C;
私人上下文的背景下;
私人长期classnum;
私人gradeBookDbAdapter mDbHelper;
私人布尔newValues;
私人的ArrayList＆LT;串GT;名单=新的ArrayList＆LT;串GT;（）;
私人的ArrayList＆LT;布尔＆GT; itemCheckedHere =新的ArrayList＆LT;布尔＆GT;（）;
私人的ArrayList＆LT;布尔＆GT; itemCheckedLate =新的ArrayList＆LT;布尔＆GT;（）;
私人的ArrayList＆LT;整数GT; itemCheckedIdx =新的ArrayList＆LT;整数GT;（）;
INT idxCol;
INT IDX;// itemChecked将存储选中项的位置。公共MyDataAdapter（上下文的背景下，INT布局，光标C，的String []从，
INT []以龙mRowId，布尔new_attendance）{
超（背景下，布局，C，从，到）;
this.c = C;
this.context =背景;
mDbHelper =新gradeBookDbAdapter（背景）;
mDbHelper.open（）;
classnum = mRowId;
newValues = new_attendance;
c.moveToFirst（）;
的for（int i = 0; I＆LT; c.getCount（）;我++）{
itemCheckedHere.add（I，FALSE）; //初始化所有项目进行假值
itemCheckedLate.add（I，FALSE）; //初始化所有项目进行假值
}
}公共查看getView（最终诠释POS，查看inView，父母的ViewGroup）{
档案文件;
ImageView的studentPhoto; 如果（inView == NULL）{
LayoutInflater吹气=（LayoutInflater）上下文
.getSystemService（Context.LAYOUT_INFLATER_SERVICE）;
inView = inflater.inflate（R.layout.show_attendance，NULL）;
} //设置名称字段
最终的TextView studentName =（TextView中）inView.findViewById（R.id.stuname）;
最终的TextView studentIndex =（TextView中）inView.findViewById（R.id.stuIndex）;
如果（studentName！= NULL）
{
c.moveToPosition（POS）
INT指数= c.getColumnIndex（gradeBookDbAdapter.KEY_NAME）;
字符串名称= c.getString（指数）;
studentName.setText（名）; 指数= c.getColumnIndex（gradeBookDbAdapter.KEY_STUDENT）;
字符串指数= c.getString（指数）;
studentIndex.setText（索引）;
//设置照片图标 文件=新的文件（Environment.getExternalStorageDirectory（）+
/成绩册/+姓名+.JPG）;
studentPhoto =（ImageView的）inView.findViewById（R.id.icon）; 如果（file.exists（））{
字符串文件名= file.getAbsolutePath（）;
BitmapFactory.Options选择采用=新BitmapFactory.Options（）;
位图BM; BM = BitmapFactory.de codeFILE（文件名，选择采用）;
studentPhoto.setImageBitmap（BM）;
}
其他{
//使用图标图像
studentPhoto.setImageResource（R.drawable.person_icon）;
} }
最后复选框cBoxH =（复选框）inView.findViewById（R.id.attend）;
最后复选框cBoxL =（复选框）inView.findViewById（R.id.late）;
cBoxH.setOnClickListener（新OnClickListener（）{ 公共无效的onClick（视图v）{ 复选框CB =（复选框）v.findViewById（R.id.attend）; 如果（cb.isChecked（））{
itemCheckedHere.set（POS，真）;
INT指数=新的整数（studentIndex.getText（）的toString（））;
mDbHelper.insertAttend（索引，classnum，1）;
}否则如果（！cb.isChecked（））{
itemCheckedHere.set（POS，FALSE）;
INT指数=新的整数（studentIndex.getText（）的toString（））;
mDbHelper.deleteAttend（索引，classnum）;
}
}
}）;
cBoxL.setOnClickListener（新OnClickListener（）{ 公共无效的onClick（视图v）{
复选框CB =（复选框）v.findViewById（R.id.late）; 如果（cb.isChecked（））{
itemCheckedLate.set（POS，真）;
//做一些操作在这里
}否则如果（！cb.isChecked（））{
itemCheckedLate.set（POS，FALSE）;
//做一些操作在这里
}
}
}）;
cBoxH.setChecked（itemCheckedHere.get（POS））; //这将选中或取消
cBoxL.setChecked（itemCheckedLate.get（POS））; //这将选中或取消
//复选框的ListView
//按其原来
//位置和CheckBox始终是不可
//损失他国时，
//滚动列表项。
返回inView;
}}
解决方案
这得到了回答的评论，但它也可能得到一个真正的答案^^
getCount将（）实际上是返回0，所以这个问题是在查询回来空的，而不是在适配器。
I have an adapter that extends simplecursoradapter. The new view is supposed to take a cursor from a database along with an image, populate a list with a couple of checkboxes. For some reason I can't seem to see, my getView is not even being called. I have a breakpoint inside getView and it never gets there and the list just shows up empty. Can anyone take a look thru and see what I've done wrong
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);
}
Here's my adapter code:
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;
}
}
解决方案
This got answered in the comment, but it might as well get a real answer ^^
getCount() is actually returning 0, so the problem is in the query coming back empty, and not in the adapter.
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