Three methods for adding actions to android listening events

The first method is the method of getting started. It is usually defined directly in the oncreate event of the activity component and acts directly. In this way, each control is defined once, which is usually inconvenient.
Button btn = (Button) findViewById (R. id. myButton );
 
Btn. setOnClickListener (new View. OnClickListener (){
 
Public void onClick (View v ){
 
// Do something
 
}
 
});
The second method is usually to implement its interface in the activity component, so that multiple external controls can share an interface, which is relatively convenient
Public class TestMedia extends Activity implements View. OnClickListener {
 
Button btn1 = (Button) findViewById (R. id. myButton1 );
Button btn2 = (Button) findViewById (R. id. myButton2 );
 
Btn1. setOnClickListener ();
Btn2. setOnClickListener ();
 
}
 
Public void onClick (View v ){
 
Switch (v. getId ()){
 
Case R. id. myButton1:
 
// Do something
 
Break;
 
Case R. id. myButton2:
 
// Do something
 
Break;
 
}
 
The third method is similar to the second method. The advantage is that if you need to implement multiple listening interfaces, it is clearer.
 
Public class TestMedia extends Activity {
 
Button btn1 = (Button) findViewById (R. id. myButton1 );
Button btn2 = (Button) findViewById (R. id. myButton2 );
 
Btn1. setOnClickListener (new ClickEvent ());
 
Btn2. setOnClickListener (new ClickEvent ());
 
}
Class ClickEvent implements View. OnClickListener
 
Public void onClick (View v ){
 
Switch (v. getId ()){
 
Case R. id. myButton1:
 
// Do something
 
Break;
 
Case R. id. myButton2:
 
// Do something
 
Break;
 
}


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