Parse.com如何为朋友列表添加ParseUser给当前用户

时间：2013-06-08 21:29:04

标签： java android eclipse parse-platform

在我的申请中，我试图建立一个与CurrentUser相关的朋友列表，我已经尝试查看Parse.com的文档，并在Parse上询问了有关此问题的问题。 com和一个Parser建议我以Array列的形式进行。虽然它似乎与CurrentUser相关（我做了3个帐户并使它们成为朋友，并且3个帐户具有不同的数组列，但我已经这样做了）从ListView中检索出来）这不是我想要的，因为它只是帐户的用户名而不是他们的个人＆＃34;行＆＃34;如果你知道我的意思，就可以对用户采取行动。

所以我问的问题是， 使用Parse后端数据库制作用户友情列表＆＃34;的最佳做法是什么？基于CurrentUser方法？

以下是我的2个活动，其中FindFriends是我搜索用户并将其添加到＆＃34; friendlist＆＃34;以及用户通过AdapterArray列表视图加载的PlayAFriend。

FindFriends Class 

package com.fullfrontalgames.numberfighter;

import java.util.List;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.FrameLayout;
import android.widget.TextView;
import android.widget.Toast;

import com.parse.FindCallback;
import com.parse.ParseException;
import com.parse.ParseObject;
import com.parse.ParseQuery;
import com.parse.ParseUser;
import com.urbanairship.UAirship;

public class Findfriends extends Activity {

    protected static final String TAG = null;

    ParseObject po;

    @Override
    public void onStart() {
        super.onStart();
        UAirship.shared().getAnalytics();

    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.findfriends);

        final EditText sbar = (EditText)findViewById(R.id.PlayerSeachBar);
        Button search = (Button)findViewById(R.id.Search);
        Button Add = (Button)findViewById(R.id.Add);
        final TextView ResultText = (TextView)findViewById(R.id.ResultTextView);
        final FrameLayout ResultFrame = (FrameLayout)findViewById(R.id.ResultFrameLayout);

        ResultFrame.setVisibility(View.GONE);

        search.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                final String username = sbar.getText().toString();

                final ParseQuery query = ParseUser.getQuery();
                query.whereEqualTo("username", username);
                query.findInBackground(new FindCallback() {

                    @Override
                    public void done(List<ParseObject> objects, ParseException e) {
                        // TODO Auto-generated method stub
                        try {
                            ParseObject userObject = objects.get(0);
                            ResultText.setText(userObject.getString("username"));
                            ResultFrame.setVisibility(View.VISIBLE);

                            Toast.makeText(getApplicationContext(), "Player Found",
                                    Toast.LENGTH_LONG).show();
                        } catch (Exception e2) {
                            e2.printStackTrace();
                            Toast.makeText(getApplicationContext(), "Username Not Found",
                                    Toast.LENGTH_LONG).show();
                        }

                    }
                });

            }
        });

        Add.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                String Friends = sbar.getText().toString();
                ParseUser currentUser = ParseUser.getCurrentUser();
                if (currentUser != null) {
                    {
                        currentUser.add("friend", Friends);
                        currentUser.saveInBackground();

                        Toast.makeText(getApplicationContext(), "Player Has Been Added",
                                Toast.LENGTH_LONG).show();

                    }
                }

            }
        });

    }

    @Override
    public void onStop() {
        super.onStop();

    }
}

PlayAFriend Class 

package com.fullfrontalgames.numberfighter;

import java.util.ArrayList;

import android.app.ListActivity;
import android.database.Cursor;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;

import com.parse.ParseObject;
import com.parse.ParseUser;
import com.urbanairship.UAirship;

public class PlayAFriend extends ListActivity {
    private static final String TAG = null;

    Cursor fFriends;

    DBAdapter db;

    ParseObject objects;

    int from;

    @Override
    public void onStart() {
        super.onStart();
        UAirship.shared().getAnalytics();
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.playafriend);

        final ParseUser currentUser = ParseUser.getCurrentUser();
        if (currentUser != null) {
            ArrayList<String> friendslist = new ArrayList<String>();
            final ArrayAdapter<String> listAdapter = new ArrayAdapter<String>(this,
                    android.R.layout.simple_list_item_1);
            ListView friendlv = (ListView)findViewById(android.R.id.list);
            friendlv.setAdapter(listAdapter);

            String friend = currentUser.get("friend").toString();
            listAdapter.add(friend);
        }
    }
}

3 个答案:

答案 0 :(得分：4)

我使用docs中的ParseRelation方法解决了问题。这是关于如何将朋友添加到当前用户的示例！

FindFriends类

public class Findfriends extends Activity {

    protected static final String TAG = null;

    ParseObject po;

    @Override
    public void onStart() {
        super.onStart();
        UAirship.shared().getAnalytics();

    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.findfriends);

        final EditText sbar = (EditText)findViewById(R.id.PlayerSeachBar);
        Button search = (Button)findViewById(R.id.Search);
        Button Add = (Button)findViewById(R.id.Add);
        final TextView ResultText = (TextView)findViewById(R.id.ResultTextView);
        final FrameLayout ResultFrame = (FrameLayout)findViewById(R.id.ResultFrameLayout);

        ResultFrame.setVisibility(View.GONE);

        search.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                final String username = sbar.getText().toString();

                final ParseQuery query = ParseUser.getQuery();
                query.whereEqualTo("username", username);
                query.findInBackground(new FindCallback() {

                    @Override
                    public void done(List<ParseObject> objects, ParseException e) {
                        // TODO Auto-generated method stub
                        try {
                            ParseObject userObject = objects.get(0);
                            ResultText.setText(userObject.getString("username"));
                            ResultFrame.setVisibility(View.VISIBLE);

                            Toast.makeText(getApplicationContext(), "Player Found",
                                    Toast.LENGTH_LONG).show();
                        } catch (Exception e2) {
                            e2.printStackTrace();
                            Toast.makeText(getApplicationContext(), "Username Not Found",
                                    Toast.LENGTH_LONG).show();
                        }

                    }
                });

            }
        });

        Add.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                String Friends = sbar.getText().toString();
                final ParseUser currentUser = ParseUser.getCurrentUser();
                if (currentUser != null) {
                    {

                        final ParseObject friend = new ParseObject("Friends");
                        friend.put("username", Friends);

                        friend.saveInBackground(new SaveCallback() {

                            @Override
                            public void done(ParseException e) {
                                // TODO Auto-generated method stub
                                ParseRelation relation = currentUser.getRelation("Friends");
                                relation.add(friend);
                                currentUser.saveInBackground();
                            }

                        });

                        Toast.makeText(getApplicationContext(), "Player Has Been Added",
                                Toast.LENGTH_LONG).show();

                    }
                }

            }
        });

    }

    @Override
    public void onStop() {
        super.onStop();

    }
}

PlayAFriend Class 

public class PlayAFriend extends ListActivity {
    private static final String TAG = null;



    ParseObject objects;



    @Override
    public void onStart() {
        super.onStart();
        UAirship.shared().getAnalytics();
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.playafriend);

        final ParseUser currentUser = ParseUser.getCurrentUser();
        if (currentUser != null) {

            final ArrayAdapter<String> listAdapter = new ArrayAdapter<String>(this,
                    android.R.layout.simple_list_item_1);
            ListView friendlv = (ListView)findViewById(android.R.id.list);

            Button play = (Button)findViewById(android.R.id.button1);
            play.setOnClickListener(new View.OnClickListener() {

                @Override
                public void onClick(View v) {
                    // TODO Auto-generated method stub

                }
            });
            friendlv.setAdapter(listAdapter);

            ParseRelation relation = currentUser.getRelation("Friends");

            ParseQuery query = relation.getQuery();

            query.whereEqualTo("username", null);

            query.findInBackground(new FindCallback() {

                @Override
                public void done(List<ParseObject> objects, ParseException e) {
                    // TODO Auto-generated method stub
                    for (int i = 0; i < objects.size(); i++) {
                        ParseObject r = objects.get(i);
                        String name = r.getString("username").toString();

                        listAdapter.add(name);
                    }

                }
            });
        }

    }

}

答案 1 :(得分：0)

使用Rest API docs方法，基于解析器的回复， 您可能希望链接数组：朋友作为用户类中的对象。

friends对象包含指向给定用户行中该用户的所有朋友的User类中OID的指针数组。

您可以通过在阵列中添加或删除对象来随意更新指针数组。 

'{"friends":{"__op":"Add","objects":[{"__type":"Pointer",
            "className":"User","objectId":"rtbhCb37tq"}]}}'

如果要获取给定用户ID的所有朋友的完整子用户行， 您只需将以下内容附加到User表中的单行的常规查询... 

--data-urlencode 'include=friends'

解析RestAPI Docs有一些很好的例子，包括Games，GameScores和GameOpponents。你可以读到它。

如果您想评估最高级的客户，我会先从“okhttp”和“volley”开始。

更传统的http内容here和here

答案 2 :(得分：0)

我已经回复了您的回答，我相信您可能会稍微改进一下代码。

我发现您创建了一个ParseObject好友并为其提供了属性＆＃34; username＆＃34;使用String Friends = sbar.getText().toString();检索，然后继续创建新创建的ParseObject与当前ParseUser（currentUser）之间的关系。

我发现的问题是在Parse DB Storage中。如果您查看Parse DB，您会发现您正在创建的ParseObject朋友不会与您最初查询的ParseUser共享相同的ObjectID或任何属性/数据。

你基本上制作的ParseObject只不过是ParseUser用户名的副本。我还发现你可以添加相同的ParseObject朋友乘法次数，因为每次你这样做都会创建一个带有单独ObjectID的新ParseObject，从而引用一个完全不同的ParseObject。

理想情况下，您希望直接引用ParseUser，我相信我已经知道如何这样做。

这是我定义的整个适配器，但它允许您直接与ParseUser建立关系，而不必创建ParseObject 

public UserQueryAdapter(Context context, final String searchCriteria) {
        // Use the QueryFactory to construct a PQA that will only show
        // Todos marked as high-pri

        super(context, new ParseQueryAdapter.QueryFactory<ParseUser>() {
            public ParseQuery<ParseUser> create() {
                ParseQuery<ParseUser> query = ParseUser.getQuery();
                query.whereContains("username", searchCriteria);
                return query;

            }
        });
    }

    @Override
    public View getItemView(final ParseUser pUser, View v, ViewGroup parent) {

        if (v == null) {
            v = View.inflate(getContext(), R.layout.search_detail, null);
        }

        super.getItemView(pUser, v, parent);

        ParseImageView todoImage = (ParseImageView) v
                .findViewById(R.id.imageViewSearch);
        ParseFile imageFile = pUser.getParseFile("photo");
        if (imageFile != null) {
            todoImage.setParseFile(imageFile);
            todoImage.loadInBackground();
        }

        // Add the title view
        final TextView titleTextView = (TextView) v
                .findViewById(R.id.textViewSearch);
        titleTextView.setText(pUser.getUsername());

        btnAdd = (ImageButton) v.findViewById(R.id.imageButtonAdd);
        btnAdd.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                // Perform action on click
                Drawable background = v.getResources().getDrawable(
                        R.drawable.ui_border_green);
                Drawable img = v.getResources().getDrawable(
                        R.drawable.ico_friend_add_green);

                btnAdd.setBackground(background);
                btnAdd.setImageDrawable(img);

                final ParseUser currentUser = ParseUser.getCurrentUser();

                if (currentUser != null) {
                    {


                        ParseRelation<ParseUser> relation = currentUser
                                .getRelation("Friends");
                        relation.add(pUser);
                        currentUser.saveInBackground();

                    }
                }

            }
        });

        return v;

    }
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