Show the Notes as a Toast | Android Tutorial pdf

Show the Notes as a Toast

Finally, we need to get control when the user selects the Raise Toast menu choice and display the notes in a Toast.
The problem is that, to do this, we need to know what restaurant to show.
So far, we have not been holding onto a specific restaurant except when we needed it, such as when we populate the detail form. Now, we need to know our current restaurant, defined as the one visible in the detail form...which could be none, if we have not yet saved anything in the form.
To make all of this work, do the following:
1. Add another data member, restaurant current, to hold the current restaurant. Be sure to initialize it to null.
2. In onSave and onListClick, rather than declaring local restaurant variables, use current to hold the restaurant we are saving (in onSave) or have clicked on (in onListClick). You will need to change
all references to the old r variable to be current in these two objects.
3. Add imports for android.view.MenuItem and android.widget.Toast.
4. Add the following implementation of onOptionsItemSelected() to your LunchList class:
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (item.getItemId()==R.id.toast) {
String message="No restaurant selected";
if (current!=null) {
message=current.getNotes();
}
Toast.makeText(this, message, Toast.LENGTH_LONG).show();
return(true);
}
return(super.onOptionsItemSelected(item));
}
Note how we will either display "No restaurant selected" (if current is null) or the restaurant's notes, depending on our current state. You can now rebuild and reinstall the application. Enter and save a restaurant, with notes, then choose the RaiseT oast options menu item, and you will briefly see your notes in a Toast:

                                              The Toast displayed, with some notes
The LunchList activity, as a whole, is shown below, incorporating all of the changes outlined in this tutorial:
package apt.tutorial;
import android.app.TabActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
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 android.widget.Toast;
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;
EditText notes=null;
RadioGroup types=null;
Restaurant current=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);
notes=(EditText)findViewById(R.id.notes);
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);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
new MenuInflater(this).inflate(R.menu.option, menu);
return(super.onCreateOptionsMenu(menu));
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (item.getItemId()==R.id.toast) {
String message="No restaurant selected";
if (current!=null) {
message=current.getNotes();
}
Toast.makeText(this, message, Toast.LENGTH_LONG).show();
return(true);
}
return(super.onOptionsItemSelected(item));
}
private View.OnClickListener onSave=new View.OnClickListener() {
public void onClick(View v) {
current=new Restaurant();
current.setName(name.getText().toString());
current.setAddress(address.getText().toString());
current.setNotes(notes.getText().toString());
switch (types.getCheckedRadioButtonId()) {
case R.id.sit_down:
current.setType("sit_down");
break;
case R.id.take_out:
current.setType("take_out");
break;
case R.id.delivery:
current.setType("delivery");
break;
}
adapter.add(current);
}
};
private AdapterView.OnItemClickListener onListClick=new
AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent,
View view, int position,
long id) {
current=model.get(position);
name.setText(current.getName());
address.setText(current.getAddress());
notes.setText(current.getNotes());
if (current.getType().equals("sit_down")) {
types.check(R.id.sit_down);
}
else if (current.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);
}
}
}
}