我使用baseadapter为我的自定义微调器带复选框，允许用户选择多个值。我的应用程序中有一个更新按钮，我需要在复选框中将数据库中的值设置为true。我的问题是我不知道该怎么做。例如我在我的微调器中有[“A”，“B”，“C”，“D”]值，在我的数据库中我得到了B和D.当我打开活动时，我将如何自动检查这些值。
这是我填充自定义微调器的代码
private void initializeCustomerSegment() {
final ArrayList<String> consumerSegments = new ArrayList<String>();
List<String> consumerSegment = databaseHandler.setItemOnConsumerSeg();
consumerSegments.addAll(consumerSegment);
checkSelectedConsumerSegment = new boolean[consumerSegments.size()];
//initialize all values of list to 'unselected' initially
for (int i = 0; i < checkSelectedConsumerSegment.length; i++) {
checkSelectedConsumerSegment[i] = false;
}
final TextView tv_ConsumerSegment = (TextView) findViewById(R.DropDownList.tv_ConsumerSegment);
tv_ConsumerSegment.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if(!expandedConsumerSegment) {
// display all selected values
String selected = "";
int flag = 0;
for (int i = 0; i < consumerSegments.size(); i++) {
if (checkSelectedConsumerSegment[i] == true) {
selected += consumerSegments.get(i);
selected += ", ";
flag = 1;
}
}
if(flag == 1) {
tv_ConsumerSegment.setText(selected);
}
expandedConsumerSegment =true;
} else {
//display shortened representation of selected values
tv_ConsumerSegment.setText(BrandListAdapter.getSelected());
expandedConsumerSegment = false;
}
}
});
//onClickListener to initiate the dropDown list
TextView tv_customerSegment = (TextView)findViewById(R.DropDownList.tv_ConsumerSegment);
tv_customerSegment.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
initiatePopUpCustomerSegment(consumerSegments,tv_ConsumerSegment);
}
});
}
private void initiatePopUpCustomerSegment(ArrayList<String> customerSegments, TextView tv_CustomerSegment) {
LayoutInflater inflater = (LayoutInflater)S_10th_IReportMain.this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
//get the pop-up window i.e. drop-down layout
LinearLayout layoutCustomerSegment = (LinearLayout)inflater.inflate(R.layout.pop_up_window_customersegment, (ViewGroup)findViewById(R.id.PopUpView1));
//get the view to which drop-down layout is to be anchored
RelativeLayout layout4 = (RelativeLayout)findViewById(R.id.relativeLayout4);
pwConsumerSegment = new PopupWindow(layoutCustomerSegment, LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, true);
//Pop-up window background cannot be null if we want the pop-up to listen touch events outside its window
pwConsumerSegment.setBackgroundDrawable(new BitmapDrawable());
pwConsumerSegment.setTouchable(true);
//let pop-up be informed about touch events outside its window. This should be done before setting the content of pop-up
pwConsumerSegment.setOutsideTouchable(true);
pwConsumerSegment.setHeight(LayoutParams.WRAP_CONTENT);
//dismiss the pop-up i.e. drop-down when touched anywhere outside the pop-up
pwConsumerSegment.setTouchInterceptor(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_OUTSIDE) {
pwConsumerSegment.dismiss();
return true;
}
return false;
}
});
//provide the source layout for drop-down
pwConsumerSegment.setContentView(layoutCustomerSegment);
//anchor the drop-down to bottom-left corner of 'layout1'
pwConsumerSegment.showAsDropDown(layout4);
//populate the drop-down list
final ListView listCustomerSegment = (ListView) layoutCustomerSegment.findViewById(R.DropDownList.dropDownCustomerSegment);
ConsumerSegmentListAdapter adapter = new ConsumerSegmentListAdapter(this, customerSegments, tv_CustomerSegment);
listCustomerSegment.setAdapter(adapter);
}
这是我的ConsumerSegmentListAdapter。 listview充当我的微调器。
public class ConsumerSegmentListAdapter extends BaseAdapter {
private ArrayList<String> mListCustomerSegment;
private LayoutInflater mInflater;
private TextView mSelectedItems;
private static int selectedCount = 0;
private static String firstSelected = "";
private ViewHolder holder;
private static String selected = ""; //shortened selected values representation
public static String getSelected() {
return selected;
}
public void setSelected(String selected) {
ConsumerSegmentListAdapter.selected = selected;
}
public ConsumerSegmentListAdapter(Context context, ArrayList<String> customerSegment,
TextView tv) {
mListCustomerSegment = new ArrayList<String>();
mListCustomerSegment.addAll(customerSegment);
mInflater = LayoutInflater.from(context);
mSelectedItems = tv;
}
@Override
public int getCount() {
return mListCustomerSegment.size();
}
@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) {
if (convertView == null) {
convertView = mInflater.inflate(R.layout.drop_down_customersegment, null);
holder = new ViewHolder();
holder.tv = (TextView) convertView.findViewById(R.DropDownList.SelectOptionCustomerSegment);
holder.chkbox = (CheckBox) convertView.findViewById(R.DropDownList.checkboxCustomerSegment);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.tv.setText(mListCustomerSegment.get(position));
final int position1 = position;
//whenever the checkbox is clicked the selected values textview is updated with new selected values
holder.chkbox.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
setText(position1);
}
});
if(S_10th_IReportMain.checkSelectedConsumerSegment[position])
holder.chkbox.setChecked(true);
else
holder.chkbox.setChecked(false);
return convertView;
}
/*
* Function which updates the selected values display and information(checkSelectedConsumerSegment[])
* */
private void setText(int position1){
if (!S_10th_IReportMain.checkSelectedConsumerSegment[position1]) {
S_10th_IReportMain.checkSelectedConsumerSegment[position1] = true;
selectedCount++;
} else {
S_10th_IReportMain.checkSelectedConsumerSegment[position1] = false;
selectedCount--;
}
if (selectedCount == 0) {
mSelectedItems.setText(R.string.select_consumersegment);
} else if (selectedCount == 1) {
for (int i = 0; i < S_10th_IReportMain.checkSelectedConsumerSegment.length; i++) {
if (S_10th_IReportMain.checkSelectedConsumerSegment[i] == true) {
firstSelected = mListCustomerSegment.get(i);
break;
}
}
mSelectedItems.setText(firstSelected);
setSelected(firstSelected);
} else if (selectedCount > 1) {
for (int i = 0; i < S_10th_IReportMain.checkSelectedConsumerSegment.length; i++) {
if (S_10th_IReportMain.checkSelectedConsumerSegment[i] == true) {
firstSelected = mListCustomerSegment.get(i);
break;
}
}
mSelectedItems.setText(firstSelected + " & "+ (selectedCount - 1) + " more");
setSelected(firstSelected + " & "+ (selectedCount - 1) + " more");
}
}
private class ViewHolder {
TextView tv;
CheckBox chkbox;
}
}
答案 0 :(得分：1)
我认为你需要为选定/未选择的项管理另一个存储并将其移动到适配器。例如。它可以是HashSet<String>。然后代码看起来如下（请注意，我使它可编译，因为它不可能编译问题中提供的一个）：
public class S_10th_IReportMain extends Activity {
boolean expandedConsumerSegment;
ConsumerSegmentListAdapter mAdapter;
private static class DatabaseHandler {
List<String> setItemOnConsumerSeg() {
return Collections.emptyList();
}
}
private static class BrandListAdapter {
static String getSelected() {
return "string";
}
}
DatabaseHandler databaseHandler = new DatabaseHandler();
private void initializeCustomerSegment() {
final ArrayList<String> consumerSegments = new ArrayList<String>();
List<String> consumerSegment = databaseHandler.setItemOnConsumerSeg();
consumerSegments.addAll(consumerSegment);
final TextView tv_ConsumerSegment = (TextView) findViewById(R.id.tv_ConsumerSegment);
tv_ConsumerSegment.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(!expandedConsumerSegment) {
// display all selected values
String selected = "";
int flag = 0;
for (String segment : consumerSegments) {
if (mAdapter.isChecked(segment)) {
selected += segment;
selected += ", ";
flag = 1;
}
}
if(flag == 1) {
tv_ConsumerSegment.setText(selected);
}
expandedConsumerSegment =true;
} else {
//display shortened representation of selected values
tv_ConsumerSegment.setText(BrandListAdapter.getSelected());
expandedConsumerSegment = false;
}
}
});
//onClickListener to initiate the dropDown list
TextView tv_customerSegment = (TextView)findViewById(R.id.tv_ConsumerSegment);
tv_customerSegment.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
initiatePopUpCustomerSegment(consumerSegments,tv_ConsumerSegment);
}
});
}
PopupWindow pwConsumerSegment;
private void initiatePopUpCustomerSegment(ArrayList<String> customerSegments, TextView tv_CustomerSegment) {
LayoutInflater inflater = (LayoutInflater)S_10th_IReportMain.this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
//get the pop-up window i.e. drop-down layout
LinearLayout layoutCustomerSegment = (LinearLayout)inflater.inflate(R.layout.pop_up_window_customersegment, (ViewGroup)findViewById(R.id.PopUpView1));
//get the view to which drop-down layout is to be anchored
RelativeLayout layout4 = (RelativeLayout)findViewById(R.id.relativeLayout4);
pwConsumerSegment = new PopupWindow(layoutCustomerSegment, ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT, true);
//Pop-up window background cannot be null if we want the pop-up to listen touch events outside its window
pwConsumerSegment.setBackgroundDrawable(new BitmapDrawable());
pwConsumerSegment.setTouchable(true);
//let pop-up be informed about touch events outside its window. This should be done before setting the content of pop-up
pwConsumerSegment.setOutsideTouchable(true);
pwConsumerSegment.setHeight(ViewGroup.LayoutParams.WRAP_CONTENT);
//dismiss the pop-up i.e. drop-down when touched anywhere outside the pop-up
pwConsumerSegment.setTouchInterceptor(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_OUTSIDE) {
pwConsumerSegment.dismiss();
return true;
}
return false;
}
});
//provide the source layout for drop-down
pwConsumerSegment.setContentView(layoutCustomerSegment);
//anchor the drop-down to bottom-left corner of 'layout1'
pwConsumerSegment.showAsDropDown(layout4);
//populate the drop-down list
final ListView listCustomerSegment = (ListView) layoutCustomerSegment.findViewById(R.id.dropDownCustomerSegment);
ConsumerSegmentListAdapter adapter = new ConsumerSegmentListAdapter(this, customerSegments, tv_CustomerSegment);
listCustomerSegment.setAdapter(adapter);
}
public static class ConsumerSegmentListAdapter extends BaseAdapter {
private ArrayList<String> mListCustomerSegment;
private LayoutInflater mInflater;
private TextView mSelectedItems;
private static int selectedCount = 0;
private static String firstSelected = "";
private ViewHolder holder;
private static String selected = ""; //shortened selected values representation
private HashSet<String> mCheckedItems;
public static String getSelected() {
return selected;
}
public void setSelected(String selected) {
ConsumerSegmentListAdapter.selected = selected;
}
public ConsumerSegmentListAdapter(Context context, ArrayList<String> customerSegment,
TextView tv) {
mListCustomerSegment = new ArrayList<String>();
mListCustomerSegment.addAll(customerSegment);
mInflater = LayoutInflater.from(context);
mSelectedItems = tv;
}
/**
* Should be called then new data obtained from DB
*
* @param checkedItems array of strings obtained from DB
*/
public void setCheckedItems(final String[] checkedItems) {
mCheckedItems.clear();
Collections.addAll(mCheckedItems, checkedItems);
notifyDataSetChanged();
}
@Override
public int getCount() {
return mListCustomerSegment.size();
}
@Override
public Object getItem(int arg0) {
return null;
}
@Override
public long getItemId(int arg0) {
return 0;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
if (convertView == null) {
convertView = mInflater.inflate(R.layout.drop_down_customersegment, null);
holder = new ViewHolder();
holder.tv = (TextView) convertView.findViewById(R.id.SelectOptionCustomerSegment);
holder.chkbox = (CheckBox) convertView.findViewById(R.id.checkboxCustomerSegment);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
final String text = mListCustomerSegment.get(position);
final boolean checked = isChecked(text);
holder.tv.setText(mListCustomerSegment.get(position));
//whenever the checkbox is clicked the selected values textview is updated with new selected values
holder.chkbox.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
setText(position, checked, text);
}
});
if(checked) {
holder.chkbox.setChecked(true);
} else {
holder.chkbox.setChecked(false);
}
return convertView;
}
/*
* Function which updates the selected values display and information(checkSelectedConsumerSegment[])
* */
private void setText(int position, boolean checked, String text){
if (!checked) {
mCheckedItems.add(text);
selectedCount++;
} else {
mCheckedItems.remove(text);
selectedCount--;
}
if (selectedCount == 0) {
mSelectedItems.setText(R.string.select_consumersegment);
} else if (selectedCount == 1) {
firstSelected = mCheckedItems.iterator().next();
mSelectedItems.setText(firstSelected);
setSelected(firstSelected);
} else if (selectedCount > 1) {
firstSelected = mCheckedItems.iterator().next();
mSelectedItems.setText(firstSelected + " & "+ (selectedCount - 1) + " more");
setSelected(firstSelected + " & "+ (selectedCount - 1) + " more");
}
}
/**
* @param segment to be checked
*
* @return true if the segment is checked
*/
public boolean isChecked(final String segment) {
return mCheckedItems.contains(segment);
}
private class ViewHolder {
TextView tv;
CheckBox chkbox;
}
}
}
那么，您从数据库中获取应该检查的新数据您只需拨打mAdapter.setCheckedItems()。
答案 1 :(得分：0)
我已经成功了。通过这个：
for (int j=0; j<brands.size(); j++)
{
for(String chosenElement : Brands)
{
int index = brands.indexOf(chosenElement);
checkSelected[index] = true;
}
}
我所做的是我在我的微调器的适配器中查找我选择的arraylist的索引，并将复选框索引设置为true。那么简单。无论如何，谢谢你的想法。