Listening-based event handling for Android development

In the Android app development process, the usual listening events are as follows:
(1) ListView Event Monitoring
SetOn Itemselectedlistener: triggered when mouse scrolling
Setonitemclicklistener: triggered when clicked
(2) EditText Event Monitoring
Setonkeylistener: triggering when getting focus
(3) Radiogroup event monitoring
Setoncheckedchangelistener: triggered when clicked
(4) CheckBox event Monitoring
Setoncheckedchangelistener: triggered when clicked
(5) Spinner Event Monitoring
Setonltemselectedlistener: triggered when clicked

(6) DatePicker event Monitoring

Ondatechangedlistener: Triggered when date is changed

(7) Datepickerdialog event monitoring
Ondatesetlistener: Triggered when the date is set
(8) Timepicker event Monitoring
Ontimechangedlistener: triggered when time changes
(9) Timepickerdialog Event Monitoring
Ontimesetlistener: triggers when setting time
(10) Button.imagebutton Event Monitoring
Setonclicklistener: triggered when clicked
(11) Menu Event Listener
onoptionsltemselected; Trigger when clicked
(12) Gallery Event Monitoring
Setonitemclicklistener: triggered when clicked
(13) GridView Event Listener
Setonltemclicklistener: triggered when clicked

Ways to implement event listeners:

• Inner class Form
• Class form of outer class
• Activity itself as an event listener class
• Anonymous inner class form
• Bind directly to a label

Inner class form

Defines the event listener class within the current class

　　

PublicClass TestExtendsactivity{@OverrideProtectedvoid onCreate (@Nullable Bundle savedinstancestate) { Super. OnCreate (savedinstancestate); Setcontentview (R.layout.activity_main); Button button = (Button) Findviewbyid (r.id.about); Mybuttonlistener listener = new mybuttonlistener (); Button.setonclicklistener (listener);} class Mybuttonlistener implements view.onclicklistener{@Override public void OnClick (View V) { // related event handling }               }} 

Class form of outer class

Test class

Extends activity{    @Override    voidSuperonCreate (savedinstancestate); Setcontentview ( R.layout.activity_main); Button button =new mybuttonlistener (); Button.setonclicklistener (listener);}}     

Mybuttonlistener class

Implements View.onclicklistener {    @Override    void// event handling }}    

activity itself as an event listener class

The activity itself as the event listener class

　　

PublicClass Testextends Activity implements view.onclicklistener{@Override protected void onCreate (@Nullable Bundle savedinstancestate) { SuperonCreate (savedinstancestate); Setcontentview (R.layout.activity_main); Button button = (Button) Findviewbyid (r.id.about); Button.setonclicklistener (this);} @Override  Public void OnClick (View v) { // event handling }}         

anonymous inner class form

Publicclass Test extendsprotected void OnCreate (@Nullable Bundle savedinstancestate) {super . OnCreate (Savedinstancestate); Setcontentview (R.layout.activity_main); Button button =new View.onclicklistener () {@Override public void//  event handling  

bind directly to a label

Add the onclick attribute to the XML layout file and set the relevant method

Define a method, remember that the parameter is the view

Listening-based event handling for Android development