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public class Planets 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.listview);
// 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() ;
if (planets == null) {
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")
};
}
ArrayList<Planet> planetList = new ArrayList<Planet>();
planetList.addAll(Arrays.asList(planets));
// 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);
CheckBox checkBox ;
TextView textView ;
if (convertView == null) {
convertView = inflater.inflate(R.layout.simplerow, null);
textView = (TextView) convertView.findViewById(R.id.rowTextView);
checkBox = (CheckBox) convertView.findViewById(R.id.CheckBox01);
convertView.setTag(new PlanetViewHolder(textView,checkBox));
checkBox.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
CheckBox cb = (CheckBox) v ;
Planet planet = (Planet) cb.getTag();
planet.setChecked(cb.isChecked());
if(cb.isChecked()){
String s = planet.getName();
System.out.println(s);
}
}
});
}
else {
PlanetViewHolder viewHolder = (PlanetViewHolder) convertView.getTag();
checkBox = viewHolder.getCheckBox() ;
textView = viewHolder.getTextView() ;
}
checkBox.setTag(planet);
checkBox.setChecked(planet.isChecked());
textView.setText(planet.getName());
return convertView;
}
}
public Object onRetainNonConfigurationInstance() {
return planets ;
}
}