ListView和CursorAdapter在滚动时不保持状态
我有一个由Custom CursorAdapter填充的ListView，这个CursorAdapter里面有多个可选择/可操作的组件。
即使我在ListView中执行某些操作并滚动视图，状态也会丢失。
当我观察logcat时，我可以看到onCheckChangeListener的代码，即使没有单击按钮，也会每次调用这些组件。不确定是什么问题。
public class CalendarSettinsAdapater extends CursorAdapter {
private int myClickPosition;
private int myCheckPosition;
DBHelper dbHelper;
Context classContext;
Cursor classCursor;
ToggleButton mtoggle;
CheckBox mCheckBox;
TextView mTitle;
Button mButton;
boolean buttonEnable = false;
ToggleEvent toggleEvent = new ToggleEvent();
ToggleEventListener toggleEventLis = new ToggleEventListener();
ListView calListView;
@SuppressWarnings("deprecation")
public CalendarSettinsAdapater(Context context, Cursor c) {
super(context, c);
}
@SuppressLint("ResourceAsColor")
@Override
public void bindView(View view, Context context, Cursor cursor) {
Typeface tf = Typeface.createFromAsset(context.getAssets(),
"fonts/Glegoo-Regular.ttf");
calListView = (ListView) view.findViewById(R.id.calendarSettingsList);
mTitle = (TextView) view.findViewById(R.id.calendarName);
mtoggle = (ToggleButton) view.findViewById(R.id.silentToggle);
mButton = (Button) view.findViewById(R.id.calendarExceptionEvents);
mCheckBox = (CheckBox) view.findViewById(R.id.visibility);
mtoggle.setTag(cursor.getPosition());
mButton.setTag(cursor.getPosition());
mCheckBox.setTag(cursor.getPosition());
mTitle.setTypeface(tf);
mTitle.setText(cursor.getString(cursor.getColumnIndex(cursor
.getColumnName(1))));
mTitle.setTextColor(Color.WHITE);
classContext = context;
classCursor = cursor;
View v = view.findViewById(R.id.circleShape);
final GradientDrawable rectCal = (GradientDrawable) v.getBackground();
int key = Integer.parseInt(cursor.getString(cursor
.getColumnIndex(cursor.getColumnName(0))));
rectCal.setColor(cursor.getInt(cursor.getColumnIndex(cursor
.getColumnName(4))));
mCheckBox
.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
int position = (Integer) buttonView.getTag();
myCheckPosition = position;
if (isChecked) {
updateDbToShow(classContext, classCursor);
} else {
updateDbToGreyed(classContext, classCursor);
}
}
});
mtoggle.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
final int position = (Integer) buttonView.getTag();
myClickPosition = position;
if (isChecked) {
updateDbToHandle(classContext, classCursor);
} else {
updateDbToIgnore(classContext, classCursor);
}
}
});
setProperToggleButtonStatus(classContext, classCursor, mtoggle, mButton);
setProperCheckBoxStatus(classContext, classCursor, mCheckBox, mTitle);
}
private void setProperCheckBoxStatus(Context context, Cursor cursor,
CheckBox mcheckBox, TextView mTitle) {
String calVisible = cursor.getString(cursor.getColumnIndex(cursor
.getColumnName(5)));
if (calVisible.equalsIgnoreCase("1")) {
mcheckBox.setChecked(true);
mtoggle.setEnabled(true);
if (buttonEnable == true) {
mButton.setEnabled(true);
} else
mButton.setEnabled(false);
} else {
mcheckBox.setChecked(false);
mtoggle.setEnabled(true);
mButton.setEnabled(true);
}
}
private void setProperToggleButtonStatus(Context context, Cursor cursor,
ToggleButton mtoggle, Button mButton) {
dbHelper = new DBHelper(context);
String calState1 = cursor.getString(cursor.getColumnIndex(cursor
.getColumnName(2)));
int calState = Integer.parseInt(calState1);
int expEvent = dbHelper.getExceptionEvents(cursor.getString(cursor
.getColumnIndex(cursor.getColumnName(0))), calState);
String buttonLabel = String.valueOf(expEvent);
if (calState1.equalsIgnoreCase("1")) {
mtoggle.setChecked(true);
if (expEvent < 1) {
mButton.setEnabled(false);
buttonEnable = false;
} else {
mButton.setEnabled(true);
buttonEnable = true;
}
mtoggle.setEnabled(true);
mButton.setText(buttonLabel);
mButton.setTextColor(Color.WHITE);
Drawable drawable = context.getResources().getDrawable(
R.drawable.ic_custom_ringer);
drawable.setBounds(0, 0,
(int) (drawable.getIntrinsicWidth() * 0.40),
(int) (drawable.getIntrinsicHeight() * 0.40));
mButton.setCompoundDrawables(drawable, null, null, null);
} else {
mtoggle.setChecked(false);
if (expEvent < 1) {
mButton.setEnabled(false);
buttonEnable = false;
} else {
mButton.setEnabled(true);
buttonEnable = true;
}
mtoggle.setEnabled(true);
mButton.setText(buttonLabel);
mButton.setTextColor(Color.WHITE);
mButton.setCompoundDrawablesWithIntrinsicBounds(
R.drawable.ic_custom_silent, 0, 0, 0);
Drawable drawable = context.getResources().getDrawable(
R.drawable.ic_custom_silent);
drawable.setBounds(0, 0,
(int) (drawable.getIntrinsicWidth() * 0.40),
(int) (drawable.getIntrinsicHeight() * 0.40));
mButton.setCompoundDrawables(drawable, null, null, null);
}
}
private void updateDbToGreyed(Context context, Cursor cursor) {
//update database
}
private void updateDbToShow(Context context, Cursor cursor) {
//update database
}
protected void updateDbToHandle(Context context, Cursor cursor) {
//update database
}
protected void updateDbToIgnore(Context context, Cursor cursor) {
//update database
}
@SuppressWarnings("static-access")
@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
classContext = context;
classCursor = cursor;
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(context.LAYOUT_INFLATER_SERVICE);
View view = inflater.inflate(R.layout.calendar_settings_item, null);
calListView = (ListView) view.findViewById(R.id.calendarSettingsList);
mTitle = (TextView) view.findViewById(R.id.calendarName);
mtoggle = (ToggleButton) view.findViewById(R.id.silentToggle);
mButton = (Button) view.findViewById(R.id.calendarExceptionEvents);
mCheckBox = (CheckBox) view.findViewById(R.id.visibility);
setProperCheckBoxStatus(classContext, classCursor, mCheckBox, mTitle);
setProperToggleButtonStatus(classContext, classCursor, mtoggle, mButton);
return view;
}
private OnClickListener mCheckBoxListener = new OnClickListener() {
@Override
public void onClick(View v) {
final int position = (Integer) v.getTag();
myCheckPosition = position;
if (mCheckBox.isChecked()) {
updateDbToShow(classContext, classCursor);
} else {
updateDbToGreyed(classContext, classCursor);
}
}
};
private OnClickListener mToggleClickListener = new OnClickListener() {
@Override
public void onClick(View v) {
final int position = (Integer) v.getTag();
myClickPosition = position;
if (mtoggle.isChecked()) {
updateDbToHandle(classContext, classCursor);
} else {
updateDbToIgnore(classContext, classCursor);
}
}
};
}][2]
2 个答案:
答案 0 :(得分：0)
您必须使用ViewHolder概念，只有在view为null时才初始化视图的所有组件，
像
View vi = convertView; // trying to reuse a recycled view
final ViewHolder holder;// = null;
final Item row_pos = rowItem.get(position);
if (vi == null) {
// The view is not a recycled one: we have to inflate
vi = mLayoutInflater.inflate(R.layout.menu_item_list_row, parent,
false);
holder = new ViewHolder();
holder.txtTitle = (TextView) vi.findViewById(R.id.title);
holder.txtPrice = (TextView) vi.findViewById(R.id.txtPrice);
holder.edtQty = (EditText) vi.findViewById(R.id.edtQty);
holder.edtQty.setInputType(InputType.TYPE_CLASS_NUMBER);
vi.setTag(holder);
// setting the image resource and title
} else {
// View recycled !
// no need to inflate
// no need to findViews by id
holder = (ViewHolder) vi.getTag();
}
return vi;
答案 1 :(得分：0)
尝试将其添加到xml文件中的复选框
android:button="@null"
android:focusable="false"
android:focusableInTouchMode="false"
您需要通过检查布局标记来控制视图更改并保持对象的状态，即CheckBox。
mCheckBox.setOnCheckedChangeListener(null);
我使用了以下方法。我希望它会有所帮助。
@SuppressLint("InflateParams")
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
View v = convertView;
ViewHolder holder = null;
if (v == null) {
LayoutInflater vi = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = vi.inflate(R.layout.listview_items, null);
holder = new ViewHolder();
holder.text_title = (TextView)v.findViewById(R.id.txt_exp_title);
holder.text_description = (TextView)v.findViewById(R.id.txt_exp_desc);
holder.icon = (ImageView)v.findViewById(R.id.img_exp_image);
holder.star = (CheckBox)v.findViewById(R.id.img_exp_bookmark_selected);
v.setTag(holder);
} else {
holder = (ViewHolder) v.getTag();
holder.star.setOnCheckedChangeListener(null);
}
final POJOExponatListe o = filtered.get(position);
if (o != null) {
if (holder.text_title != null)
holder.text_title.setText(o.getTitle());
if (holder.text_description != null)
holder.text_description.setText(o.getDescription());
if (holder.icon != null)
new AQuery(holder.icon).image(o.getImageUrl());
Log.e(" Get VIEw ADaPTER", " " + o.getPosition());
if (holder.star != null)
holder.star.setChecked(o.getPosition());
holder.star
.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
if (isChecked) {
System.out.println(position + " " + o.getID()
+ "--- :)");
dbHelper.toggleExponatBookmark(o.getID(),
"true");
o.setPosition(true);
} else {
dbHelper.toggleExponatBookmark(o.getID(),
"false");
o.setPosition(false);
}
}
});
}
return v;
}
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