我想在检查每个孩子复选框时，在DatabaseHelper中启动不同方法。有MainActivity：
public class MainActivity extends AppCompatActivity {
ExpListViewAdapterWithCheckbox listAdapter;
ExpandableListView expListView;
ArrayList<String> listDataHeader;
HashMap<String, List<String>> listDataChild;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
expListView = (ExpandableListView) findViewById(R.id.lvExp);
prepareListData();
listAdapter = new ExpListViewAdapterWithCheckbox(this, listDataHeader, listDataChild);
expListView.setAdapter(listAdapter);
expListView.setOnGroupClickListener(new OnGroupClickListener() {
@Override
public boolean onGroupClick(ExpandableListView parent, View v,
int groupPosition, long id) {
return false;
}
});
expListView.setOnGroupExpandListener(new OnGroupExpandListener() {
@Override
public void onGroupExpand(int groupPosition) {
Toast.makeText(getApplicationContext(),
listDataHeader.get(groupPosition) + " Expanded",
Toast.LENGTH_SHORT).show();
}
});
// Listview Group collasped listener
expListView.setOnGroupCollapseListener(new OnGroupCollapseListener() {
@Override
public void onGroupCollapse(int groupPosition) {
Toast.makeText(getApplicationContext(),
listDataHeader.get(groupPosition) + " Collapsed",
Toast.LENGTH_SHORT).show();
}
});
// Listview on child click listener
expListView.setOnChildClickListener(new OnChildClickListener() {
@Override
public boolean onChildClick(ExpandableListView parent, View v,
int groupPosition, int childPosition, long id) {
if(groupPosition == 1 && childPosition == 1) {
DatabaseHelper db = new DatabaseHelper(MainActivity.this);
db.arpa();
}
ifif(groupPosition == 1 && childPosition == 2) {
DatabaseHelper db = new DatabaseHelper(MainActivity.this);
db.bugday();
}
return true;
}
});
Button button = (Button) findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent i = new Intent(MainActivity.this , TumKayitlar.class);
startActivity(i);
}
});
}
private void prepareListData() {
listDataHeader = new ArrayList<String>();
listDataChild = new HashMap<String, List<String>>();
// Adding child data
listDataHeader.add("Tahıl Ürünleri");
listDataHeader.add("Baklagiller");
listDataHeader.add("Sebzeler");
// Adding child data
List<String> tahilürünleri = new ArrayList<String>();
tahilürünleri.add("Arpa");
tahilürünleri.add("Buğday");
tahilürünleri.add("Mısır");
tahilürünleri.add("Darı");
List<String> baklagiller = new ArrayList<String>();
baklagiller.add("Nohut");
baklagiller.add("Fasulye ");
baklagiller.add("Bezelye");
baklagiller.add("Mısır");
List<String> sebzeler = new ArrayList<String>();
sebzeler.add("Pırasa");
sebzeler.add("Ispanak");
sebzeler.add("Patlıcan");
sebzeler.add("Domates");
sebzeler.add("Patates");
listDataChild.put(listDataHeader.get(0), tahilürünleri);
listDataChild.put(listDataHeader.get(1), baklagiller);
listDataChild.put(listDataHeader.get(2), sebzeler);
}
例如，当我检查Cbx“Arpa”时，我想要开始db.arpa();
或者我检查了“Buğday”开始db.bugday();
有Databasehelper部分：
public void nohut() {
nohutt = true;
}
public bugday() {
bugday = true;
}
显示数据库代码：
public class TumKayitlar extends Activity{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.expandable_listview);
DatabaseHelper dbHelper = new DatabaseHelper(this);
SQLiteDatabase db = dbHelper.getReadableDatabase();
String[] getColumnName = {"_id, student_name , student_surname "};
Cursor imlec = db.query(" student ",getColumnName, "student_surname = 81 " , null, null,null,null);
ListView listView = (ListView) findViewById(R.id.lvExp2);
ArrayList<String> student = new ArrayList<String >();
ArrayAdapter<String > adapter=new ArrayAdapter<String>(this,android.R.layout.simple_spinner_dropdown_item,student);
int student_name = imlec.getColumnIndex(" student_name ");
int student_surname = imlec.getColumnIndex(" student_surname ");
int _id = imlec.getColumnIndex("_id");
String name_surname = student_name + " " + student_surname;
while (imlec.moveToNext()){
name_surname = imlec.getString(1) + " " + imlec.getString(2) + "\n";
student.add(name_surname);
}
listView.setAdapter(adapter);
imlec.close();
db.close();
}
}
顺便提一下ExpandableAdapter：
public class ExpListViewAdapterWithCheckbox extends BaseExpandableListAdapter {
private Context mContext;
private HashMap<String, List<String>> mListDataChild;
private ArrayList<String> mListDataGroup;
private HashMap<Integer, boolean[]> mChildCheckStates;
private evdenevarcom.ar.evdenevar.MainActivity.ExpListViewAdapterWithCheckbox.ChildViewHolder childViewHolder;
private evdenevarcom.ar.evdenevar.MainActivity.ExpListViewAdapterWithCheckbox.GroupViewHolder groupViewHolder;
private String groupText;
private String childText;
public ExpListViewAdapterWithCheckbox(Context context, ArrayList<String> listDataGroup, HashMap<String, List<String>> listDataChild){
mContext = context;
mListDataGroup = listDataGroup;
mListDataChild = listDataChild;
mChildCheckStates = new HashMap<Integer, boolean[]>();
}
public int getNumberOfCheckedItemsInGroup(int mGroupPosition)
{
boolean getChecked[] = mChildCheckStates.get(mGroupPosition);
int count = 0;
if(getChecked != null) {
for (int j = 0; j < getChecked.length; ++j) {
if (getChecked[j] == true) count++;
}
}
return count;
}
@Override
public int getGroupCount() {
return mListDataGroup.size();
}
@Override
public String getGroup(int groupPosition) {
return mListDataGroup.get(groupPosition);
}
@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
groupText = getGroup(groupPosition);
if (convertView == null) {
LayoutInflater inflater = (LayoutInflater) mContext
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.list_group, null);
groupViewHolder = new evdenevarcom.ar.evdenevar.MainActivity.ExpListViewAdapterWithCheckbox.GroupViewHolder();
groupViewHolder.mGroupText = (TextView) convertView.findViewById(R.id.lblListHeader);
convertView.setTag(groupViewHolder);
} else {
groupViewHolder = (evdenevarcom.ar.evdenevar.MainActivity.ExpListViewAdapterWithCheckbox.GroupViewHolder) convertView.getTag();
}
groupViewHolder.mGroupText.setText(groupText);
return convertView;
}
@Override
public int getChildrenCount(int groupPosition) {
return mListDataChild.get(mListDataGroup.get(groupPosition)).size();
}
@Override
public String getChild(int groupPosition, int childPosition) {
return mListDataChild.get(mListDataGroup.get(groupPosition)).get(childPosition);
}
@Override
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
@Override
public View getChildView(final int groupPosition, final int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
final int mGroupPosition = groupPosition;
final int mChildPosition = childPosition;
childText = getChild(mGroupPosition, mChildPosition);
if (convertView == null) {
LayoutInflater inflater = (LayoutInflater) this.mContext
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.list_item, null);
childViewHolder = new evdenevarcom.ar.evdenevar.MainActivity.ExpListViewAdapterWithCheckbox.ChildViewHolder();
childViewHolder.mChildText = (TextView) convertView
.findViewById(R.id.lblListItem);
childViewHolder.mCheckBox = (CheckBox) convertView
.findViewById(R.id.lstcheckBox);
convertView.setTag(R.layout.list_item, childViewHolder);
} else {
childViewHolder = (evdenevarcom.ar.evdenevar.MainActivity.ExpListViewAdapterWithCheckbox.ChildViewHolder) convertView
.getTag(R.layout.list_item);
}
childViewHolder.mChildText.setText(childText);
childViewHolder.mCheckBox.setOnCheckedChangeListener(null);
if (mChildCheckStates.containsKey(mGroupPosition)) {
boolean getChecked[] = mChildCheckStates.get(mGroupPosition);
childViewHolder.mCheckBox.setChecked(getChecked[mChildPosition]);
} else {
boolean getChecked[] = new boolean[getChildrenCount(mGroupPosition)];
mChildCheckStates.put(mGroupPosition, getChecked);
childViewHolder.mCheckBox.setChecked(false);
}
childViewHolder.mCheckBox.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (isChecked) {
boolean getChecked[] = mChildCheckStates.get(mGroupPosition);
getChecked[mChildPosition] = isChecked;
mChildCheckStates.put(mGroupPosition, getChecked);
} else {
boolean getChecked[] = mChildCheckStates.get(mGroupPosition);
getChecked[mChildPosition] = isChecked;
mChildCheckStates.put(mGroupPosition, getChecked);
}
}
});
return convertView;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return false;
}
@Override
public boolean hasStableIds() {
return false;
}
public final class GroupViewHolder {
TextView mGroupText;
}
public final class ChildViewHolder {
TextView mChildText;
CheckBox mCheckBox;
}
}
}
请帮帮我，我几乎不了解java。 ：（（