Lesson Plan: Unit - 03Subject: P15A2AAD - Android Application Development
Topic of Study: Working with Dialogs
Grade/Level: Master of Computer Applications
Objective: To understand life cycle of Dialog and different types of dialog demonstration
Time Allotment: 55 Minutes
- Working with Dialogs
- An Activity can use dialogs to organize information and react to user-driven events.
- Exa. an activity might display a dialog informing the user of a problem or ask the user to confirm an action such as deleting a data record.
- Using dialogs for simple tasks helps keep the number of application activities manageable.
- There are different types:
- Dialog,
- AlertDialog,
- CharacterPickerDialog,
- TimerPickerDialog,
- DatePickerDialog,
- ProgressDialog.
- Exa.
- Lifecycle of a Dialog:
- Each Dialog must be defined within the Activity in which it is used.
- A Dialog may be launched once, or used repeatedly.
- Let’s look at the key methods that an Activity must use to manage a Dialog:
- The showDialog() method is used to display a Dialog.
- The dismissDialog() method is used to stop showing a Dialog. The Dialog is kept around in the Activity’s Dialog pool. If the Dialog is shown again using showDialog(), the cached version is displayed once more.
- The removeDialog() method is used to remove a Dialog from the Activity objects Dialog pool. The Dialog is no longer kept around for future use. If you call showDialog() again, the Dialog must be re-created.
- Exa. Simple Alert Dialog
- Exa. Dialog with Yes/No Buttons
- Exa. Date Picker Dialog
- Exa. Timer Picker Dialog
