请问在一个类中如何调用MainActivity的函数呢？

[fisheep_works]

//dcloud的插件类
public class login extends StandardFeature
{
    public void PluginTestFunction(IWebview pWebview, JSONArray array)
    {
          //这里怎么调用MainActivity中的FBLogin函数呢？
    }
}

public class MainActivity extends Activity {

	private CallbackManager callbackManager = null;

	public void FBLogin(){
		if ( callbackManager == null ) {
			callbackManager = CallbackManager.Factory.create();

			LoginManager.getInstance().registerCallback(callbackManager,
					new FacebookCallback<LoginResult>() {
						@Override
						public void onSuccess(LoginResult loginResult) {
							// App code
							AccessToken accessToken = loginResult.getAccessToken();

							GraphRequest request = GraphRequest.newMeRequest(
									accessToken,
									new GraphRequest.GraphJSONObjectCallback() {
										@Override
										public void onCompleted(JSONObject object, GraphResponse response) {
											Log.d("test", "complete");
											Log.d("test", object.optString("email"));
										}
									});

							Bundle parameters = new Bundle();
							parameters.putString("fields", "email");
							request.setParameters(parameters);
							request.executeAsync();
						}

						@Override
						public void onCancel() {
							// App code
						}

						@Override
						public void onError(FacebookException exception) {
							// App code
						}
					});
		}

		LoginManager.getInstance().logInWithReadPermissions(this, Arrays.asList("public_profile", "email"));
	}
}

[fisheep_works]

谢谢指点，已通过EventBus实现Class间的通信

[Birds2018]

MainActivity  实现一个通用接口 然后把接口实例化传给 login 类，或者用EventBus也是可以的

[qq_26763799]

获取mainactivity对象，调方法