在我的应用程序中，我试图创建一个与 CurrentUser 相关的好友列表，我尝试查看 Parse.com 的文档，并在 Parse.com 上提出了有关此问题的问题，解析器建议我这样做以数组列的形式。我已经这样做了，尽管它似乎与 CurrentUser 相关(我创建了 3 个帐户并使它们成为彼此的 friend ，并且这 3 个帐户具有从 ListView 检索到的不同数组列)这不是我的我正在寻找，因为它只是帐户的用户名，而不是对用户执行操作的各个“行”(如果您明白我的意思的话)。
所以我要问的问题是， 使用 Parse 后端数据库根据 CurrentUser 方法创建用户“好友列表”的最佳实践是什么？
这是我的 2 个 Activity ，其中 FindFriends 是我搜索用户并将其添加到“好友列表”的地方，而 PlayAFriend 是我在其中通过 AdapterArray ListView 加载好友用户的地方。
FindFriends 类
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 类
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);
}
}
}
最佳答案
我自己使用文档中的 ParseRelation 方法解决了问题。这是我如何向当前用户添加 friend 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 类
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);
}
}
});
}
}
}
关于java - Parse.com 如何将 ParseUser 添加到当前用户的好友列表，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/17004035/