android - 如何从另一个 fragment 调用一个 fragment ？

Question

我在我的 fragment 中设置了一个 facebook 登录产品，我将图形请求发送到收到数据后从 graph api 获取一些数据我想转到不同的 fragment 来处理结果但是点击登录按钮我仍然在同一个 Activity 中只有登录按钮被更改为注销按钮这意味着点击监听器是工作。如果我尝试使用 Intent 进入一个 Activity ，它工作正常，新 Activity 得到显示，但我需要转到我的 fragment ，我该怎么做，这是我的代码？

override fun onActivityCreated(savedInstanceState: Bundle?) {
    super.onActivityCreated(savedInstanceState)

    loginButton?.setOnClickListener({

        callbackManager = CallbackManager.Factory.create()
        loginButton?.setFragment(this)
        //  loginButton =  view.findViewById(R.id.log)

        loginButton?.setReadPermissions("email")
        loginButton?.registerCallback(callbackManager, object : FacebookCallback<LoginResult> {
            override fun onSuccess(loginResult: LoginResult) {

                val request: GraphRequest = GraphRequest.newMeRequest(loginResult.getAccessToken()
                        , GraphRequest.GraphJSONObjectCallback { `object`, response ->
                    // Override fun onCompleted( `object`:JSONObject,  response:GraphResponse) {
                    Log.e(TAG, `object`.toString())
                    Log.e(TAG, response.toString())

                    try {
                        userId = `object`.getString("id");
                        profilePicture = URL("https://graph.facebook.com/" + userId + "/picture?width=500&height=500");
                        if (`object`.has("first_name"))
                            firstName = `object`.getString("first_name");
                        if (`object`.has("last_name"))
                            lastName = `object`.getString("last_name");
                        if (`object`.has("email"))
                            email = `object`.getString("email");
                        if (`object`.has("birthday"))
                            birthday = `object`.getString("birthday");
                        if (`object`.has("gender")) {
                            gender = `object`.getString("gender")
                        }


                        /*     var main:Intent =  Intent(this@MainActivity, Display::class.java)
                        main.putExtra("name", firstName)
                        main.putExtra("surname", lastName)
                        main.putExtra("imageUrl",profilePicture.toString())
                        startActivity(main);
                        finish();  */
                        mainFrameFragment = MainFrameFragment()
                        parameters?.putString("name", firstName)
                        parameters?.putString("surname", lastName)
                        parameters?.putString("imageUrl",profilePicture.toString())
                        mainFrameFragment?.arguments = parameters
                        fragmentManager?.beginTransaction()
                                ?.replace(R.id.displayFragment, mainFrameFragment as MainFrameFragment,"MainFrameFragment")
                                ?.commit()

                     //   moveToNewActivity()

                    } catch (e: JSONException) {
                        e.printStackTrace();
                    } catch (e: MalformedURLException) {
                        e.printStackTrace();
                    }// App code
                })
                //        mainFrameFragment = MainFrameFragment()
                parameters = Bundle()
                parameters?.putString("fields", "id, first_name, last_name, email, birthday, gender")
                request.setParameters(parameters)
                request.executeAsync()
            }

            override fun onCancel() {
                // App code
            }

            override fun onError(exception: FacebookException) {
                // App code
            }
        })
    })
} 

Answer 1

如果你想用 Fragment2 替换整个 Fragment1，你需要在 MainActivity 中使用:

Fragment1 fragment2 = new Fragment2();
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(android.R.id.content, fragment2);
fragmentTransaction.commit();

只需将这段代码放在 MainActivity 的一个方法中，然后从 Fragment1 调用该方法。