如何从复选框列表中检索选定的数据？
我已经制作了一个列表并将 acheckbox放入列表中，现在我想从中检索选定的数据。我怎样才能做到这一点？
这是我的示例代码
public class PlanetsActivity extends Activity {
private ListView mainListView;
private Planet[] planets;
private ArrayAdapter<Planet> listAdapter;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ContentResolver cr = getContentResolver();
Cursor cur = cr.query(ContactsContract.Contacts.CONTENT_URI, null,
null, null, null);
// Find the ListView resource.
mainListView = (ListView) findViewById(R.id.mainListView);
// When item is tapped, toggle checked properties of CheckBox and
// Planet.
mainListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View item,
int position, long id) {
Planet planet = listAdapter.getItem(position);
planet.toggleChecked();
PlanetViewHolder viewHolder = (PlanetViewHolder) item.getTag();
viewHolder.getCheckBox().setChecked(planet.isChecked());
}
});
// Create and populate planets.
planets = (Planet[]) getLastNonConfigurationInstance();
// planets = new Planet[10];
// planets.Add("asdf");
ArrayList<Planet> planetList = new ArrayList<Planet>();
if (planets == null) {
if (cur.getCount() > 0) {
planets = new Planet[cur.getCount()] ;
int i=0;
while (cur.moveToNext()) {
String id = cur.getString(cur
.getColumnIndex(ContactsContract.Contacts._ID));
String name = cur.getString(cur
.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));
//Toast.makeText(getApplicationContext(), name,
//Toast.LENGTH_LONG).show();
planets = new Planet[] { new Planet(name) };
planetList.addAll(Arrays.asList(planets));
//planets[i].setName(name);
//planets[i].setChecked(false)
if(Integer.
parseInt(cur
.getString(cur
.getColumnIndex(ContactsContract
.Contacts.HAS_PHONE_NUMBER))) > 0) {
// Query phone here. Covered next
}
i++;
}
}
// planets = new Planet[] { new Planet("Mercury"),
// new Planet("Venus"), new Planet("Earth"),
// new Planet("Mars"), new Planet("Jupiter"),
// new Planet("Saturn"), new Planet("Uranus"),
// new Planet("Neptune"), new Planet("Ceres"),
// new Planet("Pluto"), new Planet("Haumea"),
// new Planet("Makemake"), new Planet("Eris") };
}
// Set our custom array adapter as the ListView's adapter.
listAdapter = new PlanetArrayAdapter(this, planetList);
mainListView.setAdapter(listAdapter);
}
/** Holds planet data. */
private static class Planet {
private String name = "";
private boolean checked = false;
public Planet() {}
public Planet(String name) {
this.name = name;
}
public Planet(String name, boolean checked) {
this.name = name;
this.checked = checked;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public boolean isChecked() {
return checked;
}
public void setChecked(boolean checked) {
this.checked = checked;
}
public String toString() {
return name;
}
public void toggleChecked() {
checked = !checked;
}
}
/** Holds child views for one row. */
private static class PlanetViewHolder {
private CheckBox checkBox;
private TextView textView;
public PlanetViewHolder() {
}
public PlanetViewHolder(TextView textView, CheckBox checkBox) {
this.checkBox = checkBox;
this.textView = textView;
}
public CheckBox getCheckBox() {
return checkBox;
}
public void setCheckBox(CheckBox checkBox) {
this.checkBox = checkBox;
}
public TextView getTextView() {
return textView;
}
public void setTextView(TextView textView) {
this.textView = textView;
}
}
/** Custom adapter for displaying an array of Planet objects. */
private static class PlanetArrayAdapter extends ArrayAdapter<Planet> {
private LayoutInflater inflater;
public PlanetArrayAdapter(Context context, List<Planet> planetList) {
super(context, R.layout.simplerow, R.id.rowTextView, planetList);
// Cache the LayoutInflate to avoid asking for a new one each time.
inflater = LayoutInflater.from(context);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// Planet to display
Planet planet = (Planet) this.getItem(position);
// The child views in each row.
CheckBox checkBox;
TextView textView;
// Create a new row view
if (convertView == null) {
convertView = inflater.inflate(R.layout.simplerow, null);
// Find the child views.
textView = (TextView) convertView
.findViewById(R.id.rowTextView);
checkBox = (CheckBox) convertView.findViewById(R.id.CheckBox01);
// Optimization: Tag the row with it's child views, so we don't
// have to
// call findViewById() later when we reuse the row.
convertView.setTag(new PlanetViewHolder(textView, checkBox));
// If CheckBox is toggled, update the planet it is tagged with.
checkBox.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
CheckBox cb = (CheckBox) v;
Planet planet = (Planet) cb.getTag();
planet.setChecked(cb.isChecked());
}
});
}
// Reuse existing row view
else {
// Because we use a ViewHolder, we avoid having to call
// findViewById().
PlanetViewHolder viewHolder = (PlanetViewHolder) convertView
.getTag();
checkBox = viewHolder.getCheckBox();
textView = viewHolder.getTextView();
}
// Tag the CheckBox with the Planet it is displaying, so that we can
// access the planet in onClick() when the CheckBox is toggled.
checkBox.setTag(planet);
// Display planet data
checkBox.setChecked(planet.isChecked());
textView.setText(planet.getName());
return convertView;
}
}
public Object onRetainNonConfigurationInstance() {
return planets;
}
}
我想将选定的数据发送到下一个活动