Android Learning note-Development components 3

1. Notification class component

   (1) Toast components: usually appear at the bottom of the screen, black border, showing a period of time automatically disappear, will not interrupt user action.

   Scenario: Download complete, update complete, charging end, installation successful, etc.

   Toast.maketext (This, "Download Done", Toast.length_short). Show ();

   (2) Notification component: notifications on the status bar

   Features: Notification with global effect, not strong timeliness.

   Scene: SMS, missed calls, downloads, etc.

   Get Notification Manager Notificationmanager Object

   Mnitificationmanager = (Notificationmanager) getsystemservice (Context.notification_service);

   Create a Notification object

   Notification Notification = new Notification (r.drawable.xxx, "xxx", System.currenttimemillis ());

   Set a specific jump

   Intent Intent = new Intent (this,secondactivity.class);

   Click to jump after setting the dropdown

   Pendingintent pendingintent = pendingintent.getactivity (this,0,intent,0);

   Setting the drop-down display

   Notification.setlatesteventinfo (This, "10086", "arrears ...", pendingintent);

   Send Notifications

   Mnotificationmanager.notify (notifyid_1,notification);

   Set the status bar notification to automatically disappear after clicking

   Notification.flags = Notification.flag_auto_cancel;

   Cancel Notification

   Mnotification.cancel (notifyid_1); Clear notification with ID number notifyid_1

   Mnotification.cancelall (); Clear all Notifications

   Add permissions to the manifest file

   Flash permission

   Android.permission.FLASHLIGHT

   Vibrator Permissions

   Android.permission.VIBRATE

   (3) Dialog Component: dialog box component

   Scenario: Whether to exit, whether to install, whether to pay

   Features: Interrupting user actions

   Way One:

   Get the object of Alertdialog construction class

   Alertdialog.builder Bulider = new Alertdialog.builder (this);

   Set some basic properties of the dialog box

   Builder.settitle ("xxx");

   Builder.setmessage ("xxx");

   Add corresponding button options

   Builder.setpositivebutton ("OK", null);

   Builder.setnegativebutton ("Cancel", null);

   Create an object of type Alertdialog

   Alertdialog Alertdialog = Builder.create ();

   Show dialog box

   Alertdialog.show ();

   Way two:

   ShowDialog (int id);

   overriding oncreatedialog (int id)

3. Progress bar Component

   (1) ProgressBar components: Horizontal progress bar

   Setmax (): Set Total progress

   Setprogress (): Set Current progress

   Setsecondaryprogress (): Set second progress

   (2) Seekbar component: can drag horizontal progress bar

   Setonseekbarchangelistener: Setting up drag-and-drop monitoring

   (3) Ratingbar components: Scoring progress bar

   Setnumstars (): Set the total number of stars

   Setrating (): Set the number of stars selected

4. Date Time class component

   (1) AnalogClock components

   (2) DigitalClock components

   (3) Timepickerdialog Time Selection dialog box

   Get Calendar Object

   Calendar calender = Calender.getinstance ();

   Timepickerdialog Timepickerdialog = new Timepickerdialog (this,new Ontimesetlistener () {

   @Override

   public void Ontimeset (timepicker view, int hourofday, int minute) {

   }

   },calendar.get (Calender.hour), Calendar.get (Calendar.mimute), true);

   Timepickerdialog.show ();

   (4) Datepickerdialog Date selection dialog box

   Datepickerdialog Datepickerdialog = new Datepickerdialog (this,new Ondatesetlistener () {

   @Override

   public void Ondateset (DatePicker view,int year,int monthofyear,int dayofmonth) {

   }

   },0,0,0);

   Datepickerdialog.show ();

   
   

Android Learning note-Development components 3