第一種也是最開始就接觸的方式,通常在activity組件的oncreate事件中直接定義,直接動作。這種方式每個控件都定義一次,通常不方便.
Button btn = (Button) findViewById(R.id.myButton);
btn .setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
//do something
}
});
第二種通常是在activity組件實現其接口,這樣可以多外控件共享一個接口,這樣相對方便
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;
}
第三種類似第二種,這樣的好處在於如果需要實現多個監聽接口,這樣更清晰
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;
}
摘自 wyyew的博客