无法解析方法Add(*:Facebook的登录到Android应用程序 [英] Cannot resolve method add(*.: Facebook Login to Android App

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问题描述

我做这个教程: https://开头developers.facebook.com/docs/android/login-with-facebook/v2.2#step1

除了我加入Facebook登录以我目前的应用程序,而不是创建一个新的空白之一。

我刚刚粘贴的OnCreate code到我的onCreate方法。

按钮显示了罚款,但我遇到的问题是,我得到一个不能解析的方法错误我的onCreate方法在我MainActivity类别本节。与错误的领域是包裹着的那些***。

 如果(savedInstanceState == NULL){
        //添加片段初始设置活动
        mainFragment =新MainFragment();
        getSupportFragmentManager()
                .beginTransaction()
                ***添加(android.R.id.content,mainFragment)***
                。承诺();
    }其他{
        //或者设置为从恢复状态信息的片段
        mainFragment = ***(MainFragment)getSupportFragmentManager()
                .findFragmentById(android.R.id.content); ***
    }    }

第一个错误:无法解析法添加(packagename.mainFragment)

第二个错误:不可兑换类型:无法施展'android.support.v4.app.Fragment'到'package.mainFragment

下面是整个类:

 公共类MainActivity扩展FragmentActivity实现OnClickListener {
    私人MainFragment mainFragment;
    按钮sendIPbutton; //按钮发送IP地址
    的EditText mEdit; //从哪些用户获取信息形式进入
    // TextView的多行文字;
    TextView的坐标;
    @覆盖
    保护无效的onCreate(捆绑savedInstanceState){
        super.onCreate(savedInstanceState);
        的setContentView(R.layout.activity_main);
        /*http://www.firstdroid.com/2010/04/29/android-development-using-gps-to-get-current-location-2/*/
        / *使用的LocationManager类获取GPS位置* /
        的LocationManager mlocManager =(的LocationManager)getSystemService(Context.LOCATION_SERVICE);
        LocationListener的mlocListener =新MyLocationListener();
        mlocManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,0,0,mlocListener);/ ******************* ********************* /
        / *获取参考意见* /
        sendIPbutton =(按钮)findViewById(R.id.sendIP);
        mEdit =(EditText上)findViewById(R.id.enterIP);
        sendIPbutton.setOnClickListener(本);// InputMethodManager IMM =(InputMethodManager)getSystemService(
// Context.INPUT_METHOD_SERVICE);
// imm.hideSoftInputFromWindow(mEdit.getWindowToken(),0);
        / *点击监听器添加到按钮sendIPbutton* /
// sendIPbutton.setOnClickListener(新OnClickListener(){
// @覆盖
//公共无效的onClick(查看为arg0){
// //添加JSON这里的逻辑
//
                串IP =HTTP://;
                IP = IP +((mEdit).getText()的toString())+/ RPI /;
                的System.out.println(IP);
                // JSON字符串={\\灯\\:[{\\lightId \\:1,\\红\\:242,\\绿色\\116 \\蓝\\:12 \\的力度\\:0.5}],\\传播\\:真正};                为InputStream的InputStream = NULL;
                字符串结果=;
                尝试{
                    // 1。 CREATE的HttpClient
                    HttpClient的HttpClient的=新DefaultHttpClient();
                    的System.out.println(无差错);
                    // 2。 MAKE POST请求给定的ip地址
                    HttpPost httpPost =新HttpPost(IP);
                    的System.out.println(无误差2);                    // JSON字符串=;
                    // 3。 BUILD JSON对象
                    //的JSONObject的JSONObject =新的JSONObject();
                    //jsonObject.accumulate()
                    JSON字符串=; //{\\灯\\:[{\\lightId \\:1,\\红\\:242,\\绿色\\116 \\蓝\\:12, \\强\\:0.5}],\\传播\\:真正};
                    JSONObject的jsonObj =新的JSONObject({\\PHONETYPE \\:\\N95 \\,\\猫\\:\\WP \\});
                    JSON = jsonObj.toString();
                    httpPost.setEntity(新StringEntity(JSON));                    // 5。 SET JSON来STRING实体
// StringEntity SE =新StringEntity(JSON);
//的System.out.println(无误差3);
//
// // 6。 SET HTTP POST实体
// httpPost.setEntity(SE);
//的System.out.println(无error4);                    // 7。设置一些标头INFORM Server中的内容的类型
// httpPost.setHeader(接受,应用/ JSON);
//的System.out.println(无error5);
// httpPost.setHeader(内容类型,应用/ JSON);
//的System.out.println(无error6);
                    // HttpPost httpPost =新HttpPost(URL);
                    //httpPost.setEntity(new StringEntity(JSON));
                    // CloseableHtt presponse响应2 = httpclient.execute(httpPost);
                    // ERROR HERE
                    // 8。 EXECUTE POST请求指定IP地址
                    HTT presponse HTT presponse = httpClient.execute(httpPost);                    的System.out.println(无error7);
// httpPost.completed();
// response2.close();                    // 9。接收响应,为InputStream
                    的InputStream = HTT presponse.getEntity()的getContent()。
                    的System.out.println(无error8);
                    // 10。 CONVERT的InputStream串
                    如果(的InputStream!= NULL){
                        结果= convertInputStreamToString(InputStream的);
                        的System.out.println(无error9);
                    }
                    其他
                        结果=没有工作!                }赶上(例外五){                    Log.d(InputStream的,e.getLocalizedMessage());
                }如果(savedInstanceState == NULL){
        //添加片段初始设置活动
        mainFragment =新MainFragment();
        getSupportFragmentManager()
                .beginTransaction()
                **加(android.R.id.content,mainFragment)**
                。承诺();
    }其他{
        //或者设置为从恢复状态信息的片段
        mainFragment = **(MainFragment)getSupportFragmentManager()
                .findFragmentById(android.R.id.content)**
    }    }

和只是让你知道了:
这里是我的mainfragment.java code

 包uva.cs4720.ms3;进口android.app.Activity;
进口android.net.Uri;
进口android.os.Bundle;
进口android.app.Fragment;
导入android.support.v4.app *。
进口android.view.LayoutInflater;
进口android.view.View;
进口android.view.ViewGroup;/ **
 *一个简单的{@link片段}子类。
 *包含此片段必须实现活动
 * {@link MainFragment.OnFragmentInteractionListener}接口
 *处理交互事件。
 *使用{@link MainFragment#}的newInstance工厂方法
 *创建该片段的一个实例。
 *
 * /
公共类MainFragment扩展片段{
    // TODO:重命名参数的参数,选择匹配的名字
    //片段初始化参数,例如ARG_ITEM_NUMBER
    私有静态最后弦乐ARG_PARAM1 =参数1;
    私有静态最后弦乐ARG_PARAM2 =参数2;    // TODO:重命名和更改类型的参数
    私人字符串mParam1;
    私人字符串mParam2;    私人OnFragmentInteractionListener mListener;    / **
     *使用此工厂方法来创建新实例
     *使用提供的参数,这个片段。
     *
     * @参数参数1参数1。
     * @参数参数2参数2。
     返回:片段MainFragment的一个新实例。
     * /
    // TODO:重命名和更改类型和参数个数
    公共静态的newInstance MainFragment(字符串参数1,字符串参数2){
        MainFragment片段=新MainFragment();
        捆绑ARGS =新包();
        args.putString(ARG_PARAM1,参数1);
        args.putString(ARG_PARAM2,参数2);
        fragment.setArguments(参数);
        返回片段;
    }
    公共MainFragment(){
        //必需的空公共构造
    }    @覆盖
    公共无效的onCreate(捆绑savedInstanceState){
        super.onCreate(savedInstanceState);
        如果(getArguments()!= NULL){
            mParam1 = getArguments()的getString(ARG_PARAM1)。
            mParam2 = getArguments()的getString(ARG_PARAM2)。
        }
    }// @覆盖
//公共查看onCreateView(LayoutInflater充气器,容器的ViewGroup,
//捆绑savedInstanceState){
// //充气的布局该片段
//返回inflater.inflate(R.layout.fragment_main2,集装箱,FALSE);
//}    @覆盖
    公共查看onCreateView(LayoutInflater气筒,
                             ViewGroup中的容器中,
                             捆绑savedInstanceState){
        查看查看= inflater.inflate(R.layout.fragment_main,集装箱,FALSE);        返回视图。
    }
        // TODO:重命名方法,更新参数和勾法将UI事件
    公共无效onButton pressed(URI URI){
        如果(mListener!= NULL){
            mListener.onFragmentInteraction(URI);
        }
    }    @覆盖
    公共无效onAttach(活动活动){
        super.onAttach(活动);
        尝试{
            mListener =(OnFragmentInteractionListener)活性;
        }赶上(抛出ClassCastException E){
            抛出新ClassCastException异常(activity.toString()
                    +必须实现OnFragmentInteractionListener);
        }
    }    @覆盖
    公共无效onDetach(){
        super.onDetach();
        mListener = NULL;
    }    / **
     *此接口必须由包含此活动的实施
     *片段,以允许在该片段的相互作用来传达
     *中包含的活性和潜在的其它片段
     *活动。
     *所述p为H.;
     *请参阅Android的培训课< A HREF =
     *http://developer.android.com/training/basics/fragments/communicating.html
     *>在其他片段&所述通信; / A>了解更多信息。
     * /
    公共接口OnFragmentInteractionListener {
        // TODO:更新参数类型和名称
        公共无效onFragmentInteraction(URI URI);
    }}


解决方案

奇怪。在MainFragment,只是去掉import语句:
进口android.app.Fragment;

和添加这样的:
进口android.support.v4.app *;

解决了这个问题。

I am doing this tutorial:https://developers.facebook.com/docs/android/login-with-facebook/v2.2#step1

Except I am adding the facebook login to my current app instead of creating a new blank one.

I've just pasted the oncreate code into my oncreate method.

The button shows up fine but the issue I am having is that I am getting a Cannot Resolve Method error for this section of my oncreate method in my mainactivity class. The areas with the error are the ones wrapped with the ***.

if (savedInstanceState == null) {
        // Add the fragment on initial activity setup
        mainFragment = new MainFragment();
        getSupportFragmentManager()
                .beginTransaction()
                ***.add(android.R.id.content, mainFragment)***
                .commit();
    } else {
        // Or set the fragment from restored state info
        mainFragment = ***(MainFragment) getSupportFragmentManager()
                .findFragmentById(android.R.id.content);***
    }

    }

First Error: Cannot resolve method 'add(packagename.mainFragment)

Second error: Inconvertible types: cannot cast 'android.support.v4.app.Fragment' to 'package.mainFragment'

Here's the whole class:

public class MainActivity extends FragmentActivity implements OnClickListener {
    private MainFragment mainFragment;
    Button sendIPbutton; //Button for sending IP Address
    EditText mEdit; //Get info from what user enters in form
    //TextView mText;
    TextView coordinates;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);




        /*http://www.firstdroid.com/2010/04/29/android-development-using-gps-to-get-current-location-2/*/
        /* Use the LocationManager class to obtain GPS locations */
        LocationManager mlocManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
        LocationListener mlocListener = new MyLocationListener();
        mlocManager.requestLocationUpdates( LocationManager.GPS_PROVIDER, 0, 0, mlocListener);





/**********************************************************************/
        /*get reference to views*/
        sendIPbutton = (Button) findViewById(R.id.sendIP);
        mEdit = (EditText) findViewById(R.id.enterIP);
        sendIPbutton.setOnClickListener(this);



//        InputMethodManager imm = (InputMethodManager)getSystemService(
//                Context.INPUT_METHOD_SERVICE);
//        imm.hideSoftInputFromWindow(mEdit.getWindowToken(), 0);
        /*add click listener to Button "sendIPbutton"*/
//        sendIPbutton.setOnClickListener(new OnClickListener() {
//            @Override
//            public void onClick(View arg0) {
//                //Add JSON Logic here
//
                String ip = "http://";
                ip = ip + ((mEdit).getText().toString()) + "/rpi/";
                System.out.println(ip);
                //String json = "{\"lights\": [{\"lightId\": 1, \"red\":242,\"green\":116,\"blue\":12, \"intensity\": 0.5}],\"propagate\": true}";

                InputStream inputStream = null;
                String result = "";
                try {
                    //1. CREATE HTTPCLIENT
                    HttpClient httpClient = new DefaultHttpClient();
                    System.out.println("no error");
                    //2. MAKE POST REQUEST TO GIVEN ipAddress
                    HttpPost httpPost = new HttpPost(ip);
                    System.out.println("no error2");

                    //String json = "";
                    //3. BUILD JSON OBJECT
                    //JSONObject jsonObject = new JSONObject();
                    //jsonObject.accumulate("")
                    String json = "";//"{\"lights\": [{\"lightId\": 1, \"red\":242,\"green\":116,\"blue\":12, \"intensity\": 0.5}],\"propagate\": true}";
                    JSONObject jsonObj = new JSONObject("{\"phonetype\":\"N95\",\"cat\":\"WP\"}");
                    json = jsonObj.toString();
                    httpPost.setEntity(new StringEntity(json));

                    //5. SET JSON to STRING ENTITY
//                    StringEntity se = new StringEntity(json);
//                    System.out.println("no error3");
//
//                    //6. SET HTTP POST ENTITY
//                    httpPost.setEntity(se);
//                    System.out.println("no error4");

                    //7. SET SOME HEADERS TO INFORM SERVER ABOUT THE TYPE OF CONTENT
//                    httpPost.setHeader("Accept", "application/json");
//                    System.out.println("no error5");
//                    httpPost.setHeader("Content-type", "application/json");
//                    System.out.println("no error6");
                    //HttpPost httpPost = new HttpPost(url);
                    //httpPost.setEntity(new StringEntity(json));
                    //CloseableHttpResponse response2 = httpclient.execute(httpPost);
                    //ERROR HERE
                    //8. EXECUTE POST REQUEST TO THE GIVEN IP ADDRESS
                    HttpResponse httpResponse = httpClient.execute(httpPost);

                    System.out.println("no error7");
//                    httpPost.completed();
//                    response2.close();

                    //9. RECEIVE RESPONSE AS inputStream
                    inputStream = httpResponse.getEntity().getContent();
                    System.out.println("no error8");
                    //10. CONVERT inputStream to string
                    if(inputStream != null) {
                        result = convertInputStreamToString(inputStream);
                        System.out.println("no error9");
                    }
                    else
                        result = "Did not work!";

                } catch (Exception e) {

                    Log.d("InputStream", e.getLocalizedMessage());
                }



if (savedInstanceState == null) {
        // Add the fragment on initial activity setup
        mainFragment = new MainFragment();
        getSupportFragmentManager()
                .beginTransaction()
                .**add(android.R.id.content, mainFragment)**
                .commit();
    } else {
        // Or set the fragment from restored state info
        mainFragment = **(MainFragment) getSupportFragmentManager()
                .findFragmentById(android.R.id.content);**
    }

    }

And just so you have it: Here's my mainfragment.java code

package uva.cs4720.ms3;

import android.app.Activity;
import android.net.Uri;
import android.os.Bundle;
import android.app.Fragment;
import android.support.v4.app.*;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;



/**
 * A simple {@link Fragment} subclass.
 * Activities that contain this fragment must implement the
 * {@link MainFragment.OnFragmentInteractionListener} interface
 * to handle interaction events.
 * Use the {@link MainFragment#newInstance} factory method to
 * create an instance of this fragment.
 *
 */
public class MainFragment extends Fragment {
    // TODO: Rename parameter arguments, choose names that match
    // the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
    private static final String ARG_PARAM1 = "param1";
    private static final String ARG_PARAM2 = "param2";

    // TODO: Rename and change types of parameters
    private String mParam1;
    private String mParam2;

    private OnFragmentInteractionListener mListener;

    /**
     * Use this factory method to create a new instance of
     * this fragment using the provided parameters.
     *
     * @param param1 Parameter 1.
     * @param param2 Parameter 2.
     * @return A new instance of fragment MainFragment.
     */
    // TODO: Rename and change types and number of parameters
    public static MainFragment newInstance(String param1, String param2) {
        MainFragment fragment = new MainFragment();
        Bundle args = new Bundle();
        args.putString(ARG_PARAM1, param1);
        args.putString(ARG_PARAM2, param2);
        fragment.setArguments(args);
        return fragment;
    }
    public MainFragment() {
        // Required empty public constructor
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (getArguments() != null) {
            mParam1 = getArguments().getString(ARG_PARAM1);
            mParam2 = getArguments().getString(ARG_PARAM2);
        }
    }

//    @Override
//    public View onCreateView(LayoutInflater inflater, ViewGroup container,
//                             Bundle savedInstanceState) {
//        // Inflate the layout for this fragment
//        return inflater.inflate(R.layout.fragment_main2, container, false);
//    }

    @Override
    public View onCreateView(LayoutInflater inflater,
                             ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_main, container, false);

        return view;
    }
        // TODO: Rename method, update argument and hook method into UI event
    public void onButtonPressed(Uri uri) {
        if (mListener != null) {
            mListener.onFragmentInteraction(uri);
        }
    }

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);
        try {
            mListener = (OnFragmentInteractionListener) activity;
        } catch (ClassCastException e) {
            throw new ClassCastException(activity.toString()
                    + " must implement OnFragmentInteractionListener");
        }
    }

    @Override
    public void onDetach() {
        super.onDetach();
        mListener = null;
    }

    /**
     * This interface must be implemented by activities that contain this
     * fragment to allow an interaction in this fragment to be communicated
     * to the activity and potentially other fragments contained in that
     * activity.
     * <p>
     * See the Android Training lesson <a href=
     * "http://developer.android.com/training/basics/fragments/communicating.html"
     * >Communicating with Other Fragments</a> for more information.
     */
    public interface OnFragmentInteractionListener {
        // TODO: Update argument type and name
        public void onFragmentInteraction(Uri uri);
    }

}

解决方案

Weird. In MainFragment, just removing the import statement: import android.app.Fragment;

and adding this: import android.support.v4.app.*;

solved it.

这篇关于无法解析方法Add(*:Facebook的登录到Android应用程序的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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