Вы можете начать различные действия в зависимости от позиции в ListView элемента, который вы только что щелкнули:
private static final int ACTIVITY_0 = 0;
private static final int ACTIVITY_1 = 1;
private static final int ACTIVITY_2 = 2;
@Override
protected void onListItemClick(ListView l, View v, int position, long id)
{
super.onListItemClick(l, v, position, id);
final Intent intent = new Intent();
// Set up different intents based on the item clicked:
switch (position)
{
case ACTIVITY_0:
intent.setClass(this, com.company.merrill.IntentIntegrator.class);
break;
case ACTIVITY_1:
intent.setClass(this, com.company.merrill.SecondActivity.class);
break;
case ACTIVITY_2:
intent.setClass(this, com.company.merrill.ThirdActivity.class);
break;
default:
break;
}
// Pass the item position as the requestCode parameter, so on the `Activity`'s
// return you can examine it, and determine which activity were you in prior.
startActivityForResult(intent, position);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent intent)
{
super.onActivityResult(requestCode, resultCode, intent);
if (resultCode == RESULT_OK)
{
// Perform different actions based on from which activity is
// the application returning:
switch (requestCode)
{
case ACTIVITY_0:
// contents contains whatever the code was
String contents = intent.getStringExtra("SCAN_RESULT");
// Format contains the type of code i.e. UPC, EAN, QRCode etc...
String format = intent.getStringExtra("SCAN_RESULT_FORMAT");
// Handle successful scan. In this example
// I just put the results into the TextView
resultsTxt.setText(format + "\n" + contents);
break;
case ACTIVITY_1:
// TODO: handle the return of the SecondActivity
break;
case ACTIVITY_2:
// TODO: handle the return of the ThirdActivity
break;
default:
break;
}
}
else if (resultCode == RESULT_CANCELED)
{
// Handle cancel. If the user presses 'back'
// before a code is scanned.
resultsTxt.setText("Canceled");
}
}
Обновление
Для более элегантного результата вы можете создать собственный тип данных элемента списка:
CustomerListItem.java
public class CustomerListItem
{
private String label;
private Class<?> activity;
/**
* @param label
* @param activity
*/
public CustomerListItem(String label, Class<?> activity)
{
super();
this.label = label;
this.activity = activity;
}
/**
* @return the label
*/
public String getLabel()
{
return label;
}
/**
* @param label the label to set
*/
public void setLabel(String label)
{
this.label = label;
}
/**
* @return the activity
*/
public Class<?> getActivity()
{
return activity;
}
/**
* @param activity the activity to set
*/
public void setActivity(Class<Activity> activity)
{
this.activity = activity;
}
/* (non-Javadoc)
* @see java.lang.Object#toString()
*/
@Override
public String toString()
{
return this.label;
}
}
Используя этот класс, вы можете привязать Activity к элементу списка, поэтому при щелчке по нему вы будете знать, какой Activity запустить.
Ваш Customer.java класс будет выглядеть так:
public class Customer extends ListActivity
{
TextView selection;
CustomerListItem[] items = {
new CustomerListItem("Start Trip", StartTripActivity.class),
new CustomerListItem("Clock in", ClockinActivity.class),
new CustomerListItem("Customer Svc", CustomerSvcActivity.class),
new CustomerListItem("Independent Inspection", IInspectionActivity.class),
new CustomerListItem("Pick Up", PickUpActivity.class),
new CustomerListItem("Log Out", LogoutActivity.class)};
@Override
public void onCreate(Bundle icicle)
{
super.onCreate(icicle);
setContentView(R.layout.main);
setListAdapter(new ArrayAdapter<CustomerListItem>(
this, android.R.layout.simple_list_item_1, items));
selection = (TextView) findViewById(R.id.selection);
}
@Override
protected void onListItemClick(ListView l, View v, int position, long id)
{
super.onListItemClick(l, v, position, id);
final Intent intent = new Intent(this, items[position].getActivity());
startActivityForResult(intent, position);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent intent)
{
super.onActivityResult(requestCode, resultCode, intent);
if (resultCode == RESULT_OK)
{
// Perform different actions based on from which activity is
// the application returning:
switch (requestCode)
{
case 0:
// TODO: handle the return of the StartTripActivity
break;
case 1:
// TODO: handle the return of the ClockinActivity
break;
case 2:
// TODO: handle the return of the CustomerSvcActivity
// and so on...
break;
default:
break;
}
}
else if (resultCode == RESULT_CANCELED)
{
resultsTxt.setText("Canceled");
}
}
}