Switch Tabs On Clicks | Android Tutorial pdf

Switch Tabs On Clicks

Finally, we want to switch to the detail form when the user clicks a restaurant in the list.
This is just one extra line of code, in the onItemClick() method of our onListClick listener object:
getTabHost().setCurrentTab(1);
This just changes the current tab to the one known as index 1, which is the second tab (tabs start counting at 0).
At this point, you should be able to recompile and reinstall the application and test out the new functionality.
Here is the complete source code to our LunchList activity, after all of the changes made in this tutorial:
package apt.tutorial;
import android.app.TabActivity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.view.LayoutInflater;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.RadioGroup;
import android.widget.TabHost;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.List;
public class LunchList extends TabActivity {
List<Restaurant> model=new ArrayList<Restaurant>();
RestaurantAdapter adapter=null;
EditText name=null;
EditText address=null;
RadioGroup types=null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
name=(EditText)findViewById(R.id.name);
address=(EditText)findViewById(R.id.addr);
types=(RadioGroup)findViewById(R.id.types);
Button save=(Button)findViewById(R.id.save);
save.setOnClickListener(onSave);
ListView list=(ListView)findViewById(R.id.restaurants);
adapter=new RestaurantAdapter();
list.setAdapter(adapter);
TabHost.TabSpec spec=getTabHost().newTabSpec("tag1");
spec.setContent(R.id.restaurants);
spec.setIndicator("List", getResources()
.getDrawable(R.drawable.list));
getTabHost().addTab(spec);
spec=getTabHost().newTabSpec("tag2");
spec.setContent(R.id.details);
spec.setIndicator("Details", getResources()
.getDrawable(R.drawable.restaurant));
getTabHost().addTab(spec);
getTabHost().setCurrentTab(0);
list.setOnItemClickListener(onListClick);
}
private View.OnClickListener onSave=new View.OnClickListener() {
public void onClick(View v) {
Restaurant r=new Restaurant();
r.setName(name.getText().toString());
r.setAddress(address.getText().toString());
switch (types.getCheckedRadioButtonId()) {
case R.id.sit_down:
r.setType("sit_down");
break;
case R.id.take_out:
r.setType("take_out");
break;
case R.id.delivery:
r.setType("delivery");
break;
}
adapter.add(r);
}
};
private AdapterView.OnItemClickListener onListClick=new
AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent,
View view, int position,
long id) {
Restaurant r=model.get(position);
name.setText(r.getName());
address.setText(r.getAddress());
if (r.getType().equals("sit_down")) {
types.check(R.id.sit_down);
}
else if (r.getType().equals("take_out")) {
types.check(R.id.take_out);
}
else {
types.check(R.id.delivery);
}
getTabHost().setCurrentTab(1);
}
};
class RestaurantAdapter extends ArrayAdapter<Restaurant> {
RestaurantAdapter() {
super(LunchList.this, R.layout.row, model);
}
public View getView(int position, View convertView,
ViewGroup parent) {
View row=convertView;
RestaurantHolder holder=null;
if (row==null) {
LayoutInflater inflater=getLayoutInflater();
row=inflater.inflate(R.layout.row, parent, false);
holder=new RestaurantHolder(row);
row.setTag(holder);
}
else {
holder=(RestaurantHolder)row.getTag();
}
holder.populateFrom(model.get(position));
return(row);
}
}
static class RestaurantHolder {
private TextView name=null;
private TextView address=null;
private ImageView icon=null;
RestaurantHolder(View row) {
name=(TextView)row.findViewById(R.id.title);
address=(TextView)row.findViewById(R.id.address);
icon=(ImageView)row.findViewById(R.id.icon);
}
void populateFrom(Restaurant r) {
name.setText(r.getName());
address.setText(r.getAddress());
if (r.getType().equals("sit_down")) {
icon.setImageResource(R.drawable.ball_red);
}
else if (r.getType().equals("take_out")) {
icon.setImageResource(R.drawable.ball_yellow);
}
else {
icon.setImageResource(R.drawable.ball_green);
}
}
}
}