从MainActivity（Android）访问另一个类中的公共无效

Question

I have two public voids in a class called Flashlight, these are:

public void turnOnFlashLight()

public void turnOffFlashLight()

How can I access these within Main Activity?

I've found many guides for using another class in MainActivity but not for accessing only a specific part (in this case I'm trying to turn the flashlight on or off).

This is he contents of MainActivity

public class MainActivity extends android.support.v7.app.ActionBarActivity {

@Override
protected void onCreate(android.os.Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    httpserver();

public void httpserver() {
    AsyncHttpServer server = new AsyncHttpServer();
    java.util.List<WebSocket> _sockets = new java.util.ArrayList<WebSocket>();
    server.listen(5000);
    server.get("/flashon", new HttpServerRequestCallback() {
        static final int CAMERA_PIC_REQUEST = 0;
        public void onRequest(AsyncHttpServerRequest request, AsyncHttpServerResponse response) {
            response.send("Ok");
            Flashlight.turnOnFlashLight();

        }
    });
}
}

This is the Flashlight class https://stackoverflow.com/a/31289731/6696740

Thank you :)

Answer 1

Make sure that class is imported in MainActivity. You should be able to just use Flashlight.turnOnFlashLight() or Flashlight.turnOffFlashLight( ). You might also want to create an instance of the Flashlight class like Flashlight flashlight = Flashlight.newInstance() , then flashlight.turnOnFlashLight() or Flashlight.turnOffFlashLight().

Answer 2

In MainActivity (Assuming FlashLight class constructor does not need any input):

import Flashlight;
...
//where you need to call those methods
Flashlight flashLight = new Flashlight();
flashlight.turnOnFlashLight();
//OR
flashlight.turnOffFlashLight();