从新的FindCallback <parseuser>（）{}类型完成的方法（ParseObject，ParseException）从不在本地使用</parseuser>

Question

以下是我收到的错误：

The method done(ParseObject, ParseException) from the type new FindCallback<ParseUser>(){} is never used locally

来自

行

public void done(ParseObject object,ParseException e) {

我不确定代码的这一部分是否错误地放在代码中，但我添加了多条日志消息，然后我意识到它会跳过代码的整个部分。以下是部分：

 public void done(ParseObject object,ParseException e) {

    Log.d(Constants.LOG, "pardeobject");

ParseQuery<ParseObject> query = ParseQuery.getQuery("User");
query.getFirstInBackground(new GetCallback<ParseObject>() {
  public void done(ParseObject object, ParseException e) {
    if (object != null) {
        Log.d(Constants.LOG, "object != null");


        ParseFile file = (ParseFile)object.get("ProfilePicture");
        file.getDataInBackground(new GetDataCallback() {


        public void done(byte[] data, ParseException e) {
            if (e == null) {

                Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
                //use this bitmap as you want
                ImageView profileimage =(ImageView) getView().findViewById(R.id.profilePictureResult);
                // Set the Bitmap into the
                // ImageView
                profileimage.setImageBitmap(bitmap);
                Log.d(Constants.LOG, "works");


            } else {
              // something went wrong
                Log.d(Constants.LOG, "error else");

            }
          }
        });

    } else {
      //  Toast.makeText(getApplicationContext(), "Exception", Toast.LENGTH_SHORT) .show();
        Log.e("Error 2", e.getMessage());
        e.printStackTrace();

    }
  }
});
}

以下是完整的代码

public class Fragment1 extends Fragment {

    public interface Constants {
          String LOG = "com.dooba.beta";
        } 

    private String currentUserId;
    private ArrayAdapter<String> namesArrayAdapter;
    private ArrayList<String> names;
    private ArrayList<Images> alProfilePicture;
    private ListView usersListView;
    private Button logoutButton;
    String userGender = ParseUser.getCurrentUser().getString("Gender");
    String activityName = ParseUser.getCurrentUser().getString("ActivityName");
    Number maxDistance = ParseUser.getCurrentUser().getNumber("Maximum_Distance");
    String userLookingGender = ParseUser.getCurrentUser().getString("Looking_Gender");
    Number minimumAge = ParseUser.getCurrentUser().getNumber("Minimum_Age");
    Number maximumAge = ParseUser.getCurrentUser().getNumber("Maximum_Age");
    Number userage = ParseUser.getCurrentUser().getNumber("Age");

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

        setConversationsList();

    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment1_layout, container, false);


        return view;
    }

private void setConversationsList() {
    currentUserId = ParseUser.getCurrentUser().getObjectId();
    names = new ArrayList<String>();
    alProfilePicture = new ArrayList<Images>(); 

    // String userActivitySelectionName = null;

    ParseQuery<ParseUser> query = ParseUser.getQuery();

    //  query.whereEqualTo("ActivityName",userActivitySelectionName);

    query.whereNotEqualTo("objectId", ParseUser.getCurrentUser().getObjectId());
    // users with Gender = currentUser.Looking_Gender
    query.whereEqualTo("Gender", userLookingGender);
    // users with Looking_Gender = currentUser.Gender
    query.whereEqualTo("Looking_Gender", userGender);
    query.setLimit(1);
    query.whereEqualTo("ActivityName", activityName);
    //query.whereGreaterThanOrEqualTo("Age", minimumAge);
    //query.whereLessThanOrEqualTo("Age", maximumAge);
    query.orderByDescending("Name");

    Log.d(Constants.LOG, "after query criteria set");



    query.findInBackground(new FindCallback<ParseUser>() {


public void done(ParseObject object,ParseException e) {

            Log.d(Constants.LOG, "pardeobject");

        ParseQuery<ParseObject> query = ParseQuery.getQuery("User");
        query.getFirstInBackground(new GetCallback<ParseObject>() {
          public void done(ParseObject object, ParseException e) {
            if (object != null) {
                Log.d(Constants.LOG, "object != null");


                ParseFile file = (ParseFile)object.get("ProfilePicture");
                file.getDataInBackground(new GetDataCallback() {


                public void done(byte[] data, ParseException e) {
                    if (e == null) {

                        Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
                        //use this bitmap as you want
                        ImageView profileimage =(ImageView) getView().findViewById(R.id.profilePictureResult);
                        // Set the Bitmap into the
                        // ImageView
                        profileimage.setImageBitmap(bitmap);
                        Log.d(Constants.LOG, "works");


                    } else {
                      // something went wrong
                        Log.d(Constants.LOG, "error else");

                    }
                  }
                });

            } else {
              //  Toast.makeText(getApplicationContext(), "Exception", Toast.LENGTH_SHORT) .show();
                Log.e("Error 2", e.getMessage());
                e.printStackTrace();

            }
          }
        });
        }

        public void done(List<ParseUser> userlistname, ParseException e) {
            if (e == null) {
                for (int i=0; i<userlistname.size(); i++) {
                    names.add(userlistname.get(i).get("Name").toString());








                    //       names.add(userList.get(i).getParseObject("ProfilePicture").;


                }




                usersListView = (ListView)getActivity().findViewById(R.id.userlistname);
                namesArrayAdapter =
                        new ArrayAdapter<String>(getActivity().getApplicationContext(),
                                R.layout.user_list_item, names);
                usersListView.setAdapter(namesArrayAdapter);

                usersListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                    @Override
                    public void onItemClick(AdapterView<?> a, View v, int i, long l) {
                        openConversation(names, i);
                    }
                });

            } else {
                Toast.makeText(getActivity().getApplicationContext(),
                        "Error loading user list",
                        Toast.LENGTH_LONG).show();
            }
        }
    });
}






public void openConversation(ArrayList<String> names, int pos) {
    ParseQuery<ParseUser> query = ParseUser.getQuery();
    query.whereEqualTo("Name", names.get(pos));
    query.findInBackground(new FindCallback<ParseUser>() {
        public void done(List<ParseUser> user, ParseException e) {
            if (e == null) {
                Intent intent = new Intent(getActivity().getApplicationContext(), MessagingActivity.class);
                intent.putExtra("RECIPIENT_ID", user.get(0).getObjectId());
                startActivity(intent);
            } else {
                Toast.makeText(getActivity().getApplicationContext(),
                        "Error finding that user",
                        Toast.LENGTH_SHORT).show();
            }
        }
    });
}
}

提前致谢

更新

query.findInBackground(new FindCallback<ParseUser>() {


        public void done(ParseObject object,ParseException e) {
            Log.d(Constants.LOG, "pardeobject");

        ParseFile image = object.getParseFile("ProfilePicture");


        ParseImageView imageView = (ParseImageView) getView().findViewById(R.id.profilePictureResult);

         // The placeholder will be used before and during the fetch, to be replaced by the fetched image
         // data.
         imageView.setPlaceholder(getResources().getDrawable(R.drawable.profile_pict));
         imageView.setParseFile(image);
         imageView.loadInBackground(new GetDataCallback() {
           @Override
           public void done(byte[] data, ParseException e) {
             Log.i("ParseImageView",
                 "Fetched! Data length: " + data.length + ", or exception: " + e.getMessage());
           }
         });
        }

更新

我遇到以下问题排查： 对象无法解决

public class Fragment1 extends Fragment {

    public interface Constants {
        String LOG = "com.dooba.beta";
    }

    private String currentUserId;
    private ArrayAdapter<String> namesArrayAdapter;
    private ArrayList<String> names;
    private ArrayList<String> age;
    private ArrayList<String> headline;
    private ArrayList<String> activityname;

    private ArrayList<Images> alProfilePicture;
    private ListView usersListView;
    private Button logoutButton;
    String userGender = ParseUser.getCurrentUser().getString("Gender");
    String activityName = ParseUser.getCurrentUser().getString("ActivityName");
    Number maxDistance = ParseUser.getCurrentUser().getNumber(
            "Maximum_Distance");
    String userLookingGender = ParseUser.getCurrentUser().getString(
            "Looking_Gender");
    Number minimumAge = ParseUser.getCurrentUser().getNumber("Minimum_Age");
    Number maximumAge = ParseUser.getCurrentUser().getNumber("Maximum_Age");
    Number userage = ParseUser.getCurrentUser().getNumber("Age");

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

        setConversationsList();

    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment1_layout, container,
                false);

        return view;
    }

    private void setConversationsList() {
        currentUserId = ParseUser.getCurrentUser().getObjectId();
        names = new ArrayList<String>();
        age = new ArrayList<String>();
        headline = new ArrayList<String>();
        activityname = new ArrayList<String>();

        alProfilePicture = new ArrayList<Images>();

        // String userActivitySelectionName = null;

        ParseQuery<ParseUser> query = ParseUser.getQuery();

        // query.whereEqualTo("ActivityName",userActivitySelectionName);

        query.whereNotEqualTo("objectId", ParseUser.getCurrentUser()
                .getObjectId());
        // users with Gender = currentUser.Looking_Gender
        query.whereEqualTo("Gender", userLookingGender);
        // users with Looking_Gender = currentUser.Gender
        query.whereEqualTo("Looking_Gender", userGender);
        query.setLimit(1);
        query.whereEqualTo("ActivityName", activityName);
        // query.whereGreaterThanOrEqualTo("Age", minimumAge);
        // query.whereLessThanOrEqualTo("Age", maximumAge);
        query.orderByDescending("Name");

        Log.d(Constants.LOG, "");

        ParseQuery<ParseObject> queryo = ParseQuery.getQuery("User");

        queryo.whereNotEqualTo("objectId", ParseUser.getCurrentUser()
                .getObjectId());
        // users with Gender = currentUser.Looking_Gender
        queryo.whereEqualTo("Gender", userLookingGender);
        // users with Looking_Gender = currentUser.Gender
        queryo.whereEqualTo("Looking_Gender", userGender);
        queryo.setLimit(1);
        queryo.whereEqualTo("ActivityName", activityName);
        // query.whereGreaterThanOrEqualTo("Age", minimumAge);
        // query.whereLessThanOrEqualTo("Age", maximumAge);
        queryo.orderByDescending("Name");


        query.findInBackground(new FindCallback<ParseUser>() {

            @Override
            public void done(List<ParseUser> users,ParseException e) {

            // Do whatever you need to extract object from "users"
                ParseFile image = object.getParseFile("ProfilePicture");


                ParseImageView imageView = (ParseImageView) getView().findViewById(R.id.profilePictureResult);

                 // The placeholder will be used before and during the fetch, to be replaced by the fetched image
                 // data.
                 imageView.setPlaceholder(getResources().getDrawable(R.drawable.profile_pict));
                 imageView.setParseFile(image);
                 imageView.loadInBackground(new GetDataCallback() {
                   @Override
                   public void done(byte[] data, ParseException e) {
                     Log.i("ParseImageView",
                         "Fetched! Data length: " + data.length + ", or exception: " + e.getMessage());
                   }


             });
            }
        });

        query.findInBackground(new FindCallback<ParseUser>() {

            public void done(List<ParseUser> userlistname, ParseException e) {
                if (e == null) {
                    for (int i = 0; i < userlistname.size(); i++) {
                        names.add(userlistname.get(i).get("Name").toString());
                    }
                    usersListView = (ListView) getActivity().findViewById(
                            R.id.userlistname);
                    namesArrayAdapter = new ArrayAdapter<String>(getActivity()
                            .getApplicationContext(), R.layout.user_list_item,
                            names);
                    usersListView.setAdapter(namesArrayAdapter);

                    usersListView
                            .setOnItemClickListener(new AdapterView.OnItemClickListener() {
                                @Override
                                public void onItemClick(AdapterView<?> a,
                                                        View v, int i, long l) {
                                    openConversation(names, i);
                                }
                            });

                } else {
                    Toast.makeText(getActivity().getApplicationContext(),
                            "Error loading user list", Toast.LENGTH_LONG)
                            .show();
                }
            }

            public void done1(List<ParseUser> userlistheadline, ParseException e) {
                if (e == null) {
                    for (int i = 0; i < userlistheadline.size(); i++) {
                        headline.add(userlistheadline.get(i).get("Headline")
                                .toString());
                    }
                    usersListView = (ListView) getActivity().findViewById(
                            R.id.userlistheadline);
                    namesArrayAdapter = new ArrayAdapter<String>(getActivity()
                            .getApplicationContext(), R.layout.user_list_all,
                            headline);
                    usersListView.setAdapter(namesArrayAdapter);

                    usersListView
                            .setOnItemClickListener(new AdapterView.OnItemClickListener() {
                                @Override
                                public void onItemClick(AdapterView<?> a,
                                                        View v, int i, long l) {
                                    openConversation(names, i);
                                }
                            });

                } else {
                    Toast.makeText(getActivity().getApplicationContext(),
                            "Error loading user list", Toast.LENGTH_LONG)
                            .show();
                }
            }

            public void done2(List<ParseUser> userlistage, ParseException e) {
                if (e == null) {
                    for (int i = 0; i < userlistage.size(); i++) {
                        age.add(userlistage.get(i).get("Age").toString());
                    }
                    usersListView = (ListView) getActivity().findViewById(
                            R.id.userlistage);
                    namesArrayAdapter = new ArrayAdapter<String>(getActivity()
                            .getApplicationContext(), R.layout.user_list_item,
                            age);
                    usersListView.setAdapter(namesArrayAdapter);

                    usersListView
                            .setOnItemClickListener(new AdapterView.OnItemClickListener() {
                                @Override
                                public void onItemClick(AdapterView<?> a,
                                                        View v, int i, long l) {
                                    openConversation(names, i);
                                }
                            });

                } else {
                    Toast.makeText(getActivity().getApplicationContext(),
                            "Error loading user list", Toast.LENGTH_LONG)
                            .show();
                }
            }

            public void done3(List<ParseUser> userlistactivity, ParseException e) {
                if (e == null) {
                    for (int i = 0; i < userlistactivity.size(); i++) {
                        activityname.add(userlistactivity.get(i)
                                .get("ActivityName").toString());
                    }
                    usersListView = (ListView) getActivity().findViewById(
                            R.id.userlistactivityname);
                    namesArrayAdapter = new ArrayAdapter<String>(getActivity()
                            .getApplicationContext(), R.layout.user_list_item,
                            activityname);
                    usersListView.setAdapter(namesArrayAdapter);

                    usersListView
                            .setOnItemClickListener(new AdapterView.OnItemClickListener() {
                                @Override
                                public void onItemClick(AdapterView<?> a,
                                                        View v, int i, long l) {
                                    openConversation(names, i);
                                }
                            });

                } else {
                    Toast.makeText(getActivity().getApplicationContext(),
                            "Error loading user list", Toast.LENGTH_LONG)
                            .show();
                }
            }
        });

    }

    public void openConversation(ArrayList<String> names, int pos) {
        ParseQuery<ParseUser> query = ParseUser.getQuery();
        query.whereEqualTo("Name", names.get(pos));
        query.findInBackground(new FindCallback<ParseUser>() {
            public void done(List<ParseUser> user, ParseException e) {
                if (e == null) {
                    Intent intent = new Intent(getActivity()
                            .getApplicationContext(), MessagingActivity.class);
                    intent.putExtra("RECIPIENT_ID", user.get(0).getObjectId());
                    startActivity(intent);
                } else {
                    Toast.makeText(getActivity().getApplicationContext(),
                            "Error finding that user", Toast.LENGTH_SHORT)
                            .show();
                }
            }
        });
    }

}

以及以下

The method done2(List<ParseUser>, ParseException) from the type new FindCallback<ParseUser>(){} is never used locally

Answer 1

您的类是FindCallback接口的匿名实现，其中包含以下签名：

public abstract void done(List<T> objects,
                      ParseException e)

您的方法与此签名不符，因此不会在您的程序中使用（并且无法使用）。

如果您的代码编译正确，也意味着已经定义了上述方法。检查您是否混合了这两种方法。

---

根据您的更新代码，这是您应该写的内容（但这是基本的Java。如果您不理解它，我建议您在尝试更进一步之前学习语言。这是一个教程，你必须阅读并理解：http://docs.oracle.com/javase/tutorial/java/javaOO/anonymousclasses.html）

query.findInBackground(new FindCallback<ParseUser>() {

    @Override
    public void done(List<ParseUser> users,ParseException e) {

    // Do whatever you need to extract object from "users"
    // ...

    }

顺便说一下，一个重要的注意事项是你不会被允许操纵UI对象（比如你的ParseImageView R.id.profilePictureResult直接在这个方法中，因为这必须在UI线程中完成。所以你必须使用处理程序。这是一个单独的问题，而不是你在这里提交的问题，但这将是你的下一个问题。当你在那里时，请阅读https://developer.android.com/training/multiple-threads/communicate-ui.html