Display content on a phone screen

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Import the required classes and interfaces.

import net.rim.blackberry.api.phone.*;
import net.rim.blackberry.api.phone.phonegui.*;

Create a class that extends the AbstractPhoneListener class.

class MyPhoneScreenAction extends AbstractPhoneListener
{
}

Override PhoneListener.callIncoming() and PhoneListener.callWaiting(). For each method, add an instance of the PhoneScreen class, passing in the call ID and your application identifier.
```
public void callIncoming(int callid)
{
    PhoneScreen f = new PhoneScreen(callid, app);
}
public void callWaiting(int callid)
{
    PhoneScreen f = new PhoneScreen(callid, app);
}
```
Invoke PhoneScreen.addImage() when the application detects a specified callid.
```
f.addImage(_images[0]);
```
Invoke PhoneScreen.sendDataToScreen() to display the content in the PhoneScreen object in the incoming and active phone screens.
```
f.sendDataToScreen();
```
In the MyPhoneScreenAction class, invoke Phone.addPhoneListener() to register the class that extends AbstractPhoneListener as a PhoneListener.
```
Phone.addPhoneListener(new MyPhoneScreenAction(this));
```

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