Application類別

Application類別
新增一AP屬性的Class
然後可以透過getApplicationContext()的方式
即可使用共用的API

    API.java
    public class API extends Application {
        public void initial() {
            // write initial in this
        }
        public Class<?> next_test() {
            return finish.class;
        }
    }

    xxx.java
    API function = ((API)getApplicationContext());
    function.initial();

    Intent trigger = new Intent();
    trigger.setClass(xxx.this, function.next_test());
    startActivity(trigger);
    finish();