firebase (android)의 homefragment 목록보기에서 모든 사용자 이미지 게시물을 표시하는 방법은 무엇입니까?

Question

현재 내 목록보기는 현재 사용자의 게시물 만 파이어베이스에서만 표시합니다. firebase의 모든 사용자 게시물을 표시하려면이 목록을 변경해야합니다. 누구든지 예제 코드를 제공 할 수 있습니까?

HomeActivit.java 
HomeFragment.java 
activity_home.xml 
fragment_home.xml 

Answer 1

***HomeActivity*** 
package tabian.com.instagramclone2.Home; 

import android.content.Context; 
import android.content.Intent; 
import android.support.annotation.NonNull; 
import android.support.design.widget.TabLayout; 
import android.support.v4.app.FragmentTransaction; 
import android.support.v4.view.ViewPager; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.view.View; 
import android.widget.FrameLayout; 
import android.widget.RelativeLayout; 


import com.google.firebase.auth.FirebaseAuth; 
import com.google.firebase.auth.FirebaseUser; 
import com.ittianyu.bottomnavigationviewex.BottomNavigationViewEx; 
import com.nostra13.universalimageloader.core.ImageLoader; 

import tabian.com.instagramclone2.Login.LoginActivity; 
import tabian.com.instagramclone2.R; 
import tabian.com.instagramclone2.Utils.BottomNavigationViewHelper; 
import tabian.com.instagramclone2.Utils.MainfeedListAdapter; 
import tabian.com.instagramclone2.Utils.SectionsPagerAdapter; 
import tabian.com.instagramclone2.Utils.UniversalImageLoader; 
import tabian.com.instagramclone2.Utils.ViewCommentsFragment; 

수입 tabian.com.instagramclone2.models.Photo; 가져 오기 tabian.com.instagramclone2.models.UserAccountSettings;

공용 클래스 HomeActivity는 AppCompatActivity가 MainfeedListAdapter.OnLoadMoreItemsListener {

@Override 
public void onLoadMoreItems() { 
    Log.d(TAG, "onLoadMoreItems: displaying more photos"); 
    HomeFragment fragment = (HomeFragment)getSupportFragmentManager() 
      .findFragmentByTag("android:switcher:" + R.id.viewpager_container + ":" + mViewPager.getCurrentItem()); 
    if(fragment != null){ 
     fragment.displayMorePhotos(); 
    } 
} 

private static final String TAG = "HomeActivity"; 
private static final int ACTIVITY_NUM = 0; 
private static final int HOME_FRAGMENT = 1; 

private Context mContext = HomeActivity.this; 

//firebase 
private FirebaseAuth mAuth; 
private FirebaseAuth.AuthStateListener mAuthListener; 

//widgets 
private ViewPager mViewPager; 
private FrameLayout mFrameLayout; 
private RelativeLayout mRelativeLayout; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_home); 
    Log.d(TAG, "onCreate: starting."); 
    mViewPager = (ViewPager) findViewById(R.id.viewpager_container); 
    mFrameLayout = (FrameLayout) findViewById(R.id.container); 
    mRelativeLayout = (RelativeLayout) findViewById(R.id.relLayoutParent); 

    setupFirebaseAuth(); 

    initImageLoader(); 
    setupBottomNavigationView(); 
    setupViewPager(); 

} 



public void onCommentThreadSelected(Photo photo, String callingActivity){ 
    Log.d(TAG, "onCommentThreadSelected: selected a coemment thread"); 

    ViewCommentsFragment fragment = new ViewCommentsFragment(); 
    Bundle args = new Bundle(); 
    args.putParcelable(getString(R.string.photo), photo); 
    args.putString(getString(R.string.home_activity), getString(R.string.home_activity)); 
    fragment.setArguments(args); 

    FragmentTransaction transaction = getSupportFragmentManager().beginTransaction(); 
    transaction.replace(R.id.container, fragment); 
    transaction.addToBackStack(getString(R.string.view_comments_fragment)); 
    transaction.commit(); 

} 

public void hideLayout(){ 
    Log.d(TAG, "hideLayout: hiding layout"); 
    mRelativeLayout.setVisibility(View.GONE); 
    mFrameLayout.setVisibility(View.VISIBLE); 
} 


public void showLayout(){ 
    Log.d(TAG, "hideLayout: showing layout"); 
    mRelativeLayout.setVisibility(View.VISIBLE); 
    mFrameLayout.setVisibility(View.GONE); 
} 

@Override 
public void onBackPressed() { 
    super.onBackPressed(); 
    if(mFrameLayout.getVisibility() == View.VISIBLE){ 
     showLayout(); 
    } 
} 


private void initImageLoader(){ 
    UniversalImageLoader universalImageLoader = new UniversalImageLoader(mContext); 
    ImageLoader.getInstance().init(universalImageLoader.getConfig()); 
} 

/** 
* Responsible for adding the 3 tabs: Camera, Home, Messages 
*/ 
private void setupViewPager(){ 
    SectionsPagerAdapter adapter = new SectionsPagerAdapter(getSupportFragmentManager()); 
    adapter.addFragment(new CameraFragment()); //index 0 
    adapter.addFragment(new HomeFragment()); //index 1 
    adapter.addFragment(new MessagesFragment()); //index 2 
    mViewPager.setAdapter(adapter); 

    TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs); 
    tabLayout.setupWithViewPager(mViewPager); 

    tabLayout.getTabAt(0).setIcon(R.drawable.ic_action); 
    tabLayout.getTabAt(1).setIcon(R.drawable.ic_action_name); 
    tabLayout.getTabAt(2).setIcon(R.drawable.ic_action); 
} 

/** 
* BottomNavigationView setup 
*/ 
private void setupBottomNavigationView(){ 
    Log.d(TAG, "setupBottomNavigationView: setting up BottomNavigationView"); 
    BottomNavigationViewEx bottomNavigationViewEx = (BottomNavigationViewEx) findViewById(R.id.bottomNavViewBar); 
    BottomNavigationViewHelper.setupBottomNavigationView(bottomNavigationViewEx); 
    BottomNavigationViewHelper.enableNavigation(mContext, this,bottomNavigationViewEx); 
    Menu menu = bottomNavigationViewEx.getMenu(); 
    MenuItem menuItem = menu.getItem(ACTIVITY_NUM); 
    menuItem.setChecked(true); 
} 


/* 
------------------------------------ Firebase --------------------------------------------- 
     */ 

/** 
* checks to see if the @param 'user' is logged in 
* @param user 
*/ 
private void checkCurrentUser(FirebaseUser user){ 
    Log.d(TAG, "checkCurrentUser: checking if user is logged in."); 

    if(user == null){ 
     Intent intent = new Intent(mContext, LoginActivity.class); 
     startActivity(intent); 
    } 
} 
/** 
* Setup the firebase auth object 
*/ 
private void setupFirebaseAuth(){ 
    Log.d(TAG, "setupFirebaseAuth: setting up firebase auth."); 

    mAuth = FirebaseAuth.getInstance(); 

    mAuthListener = new FirebaseAuth.AuthStateListener() { 
     @Override 
     public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) { 
      FirebaseUser user = firebaseAuth.getCurrentUser(); 

      //check if the user is logged in 
      checkCurrentUser(user); 

      if (user != null) { 
       // User is signed in 
       Log.d(TAG, "onAuthStateChanged:signed_in:" + user.getUid()); 
      } else { 
       // User is signed out 
       Log.d(TAG, "onAuthStateChanged:signed_out"); 
      } 
      // ... 
     } 
    }; 
} 

@Override 
public void onStart() { 
    super.onStart(); 
    mAuth.addAuthStateListener(mAuthListener); 
    mViewPager.setCurrentItem(HOME_FRAGMENT); 
    checkCurrentUser(mAuth.getCurrentUser()); 
} 

@Override 
public void onStop() { 
    super.onStop(); 
    if (mAuthListener != null) { 
     mAuth.removeAuthStateListener(mAuthListener); 
    } 
} 

}을 구현 확장

Answer 2

* HomeFragment *** 내 HomeFragment.java *

package tabian.com.instagramclone2.Home; 

import android.os.Bundle; 
import android.support.annotation.Nullable; 
import android.support.v4.app.Fragment; 
import android.util.Log; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.ListView; 

import com.google.firebase.auth.FirebaseAuth; 
import com.google.firebase.database.DataSnapshot; 
import com.google.firebase.database.DatabaseError; 
    import com.google.firebase.database.DatabaseReference; 
    import com.google.firebase.database.FirebaseDatabase; 
    import com.google.firebase.database.Query; 
    import com.google.firebase.database.ValueEventListener; 

import java.util.ArrayList; 
import java.util.Collections; 
import java.util.Comparator; 
import java.util.HashMap; 
import java.util.List; 
    import java.util.Map; 

import tabian.com.instagramclone2.R; 
    import tabian.com.instagramclone2.Utils.MainfeedListAdapter; 
import tabian.com.instagramclone2.models.Comment; 
import tabian.com.instagramclone2.models.Like; 
    import tabian.com.instagramclone2.models.Photo; 
import tabian.com.instagramclone2.models.UserAccountSettings; 

/** * 사용자가 5/28/2017에 작성했습니다. */

public class HomeFragment extends Fragment { 개인 정적 final String TAG = "HomeFragment";

//vars 
private ArrayList<Photo> mPhotos; 
private ArrayList<Photo> mPaginatedPhotos; 
private ArrayList<String> mFollowing; 
private ListView mListView; 
private MainfeedListAdapter mAdapter; 
private int mResults; 


@Nullable 
@Override 
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { 
    View view = inflater.inflate(R.layout.fragment_home, container, false); 
    mListView = (ListView) view.findViewById(R.id.listView); 
    mFollowing = new ArrayList<>(); 
    mPhotos = new ArrayList<>(); 

    getFollowing(); 

    return view; 
} 

private void getFollowing(){ 
    Log.d(TAG, "getFollowing: searching for following"); 

    DatabaseReference reference = FirebaseDatabase.getInstance().getReference(); 
    Query query = reference 
      .child(getString(R.string.dbname_following)) 
      .child(FirebaseAuth.getInstance().getCurrentUser().getUid()); 
    query.addListenerForSingleValueEvent(new ValueEventListener() { 
     @Override 
     public void onDataChange(DataSnapshot dataSnapshot) { 
      for(DataSnapshot singleSnapshot : dataSnapshot.getChildren()){ 
       Log.d(TAG, "onDataChange: found user: " + 
       singleSnapshot.child(getString(R.string.field_user_id)).getValue()); 

       mFollowing.add(singleSnapshot.child(getString(R.string.field_user_id)).getValue().toString()); 
      } 
      mFollowing.add(FirebaseAuth.getInstance().getCurrentUser().getUid()); 
      //get the photos 
      getPhotos(); 
     } 

     @Override 
     public void onCancelled(DatabaseError databaseError) { 

     } 
    }); 
} 

private void getPhotos(){ 
    Log.d(TAG, "getPhotos: getting photos"); 
    DatabaseReference reference = FirebaseDatabase.getInstance().getReference(); 
    for(int i = 0; i < mFollowing.size(); i++){ 
     final int count = i; 
     Query query = reference 
       .child(getString(R.string.dbname_user_photos)) 
       .child(mFollowing.get(i)) 
       .orderByChild(getString(R.string.field_user_id)) 
       .equalTo(mFollowing.get(i)); 
     query.addListenerForSingleValueEvent(new ValueEventListener() { 
      @Override 
      public void onDataChange(DataSnapshot dataSnapshot) { 
       for(DataSnapshot singleSnapshot : dataSnapshot.getChildren()){ 

        Photo photo = new Photo(); 
        Map<String, Object> objectMap = (HashMap<String, Object>) singleSnapshot.getValue(); 

        photo.setCaption(objectMap.get(getString(R.string.field_caption)).toString()); 
        photo.setTags(objectMap.get(getString(R.string.field_tags)).toString()); 
        photo.setPhoto_id(objectMap.get(getString(R.string.field_photo_id)).toString()); 
        photo.setUser_id(objectMap.get(getString(R.string.field_user_id)).toString()); 
        photo.setDate_created(objectMap.get(getString(R.string.field_date_created)).toString()); 
        photo.setImage_path(objectMap.get(getString(R.string.field_image_path)).toString()); 

        ArrayList<Comment> comments = new ArrayList<Comment>(); 
        for (DataSnapshot dSnapshot : singleSnapshot 
          .child(getString(R.string.field_comments)).getChildren()){ 
         Comment comment = new Comment(); 
         comment.setUser_id(dSnapshot.getValue(Comment.class).getUser_id()); 
         comment.setComment(dSnapshot.getValue(Comment.class).getComment()); 
         comment.setDate_created(dSnapshot.getValue(Comment.class).getDate_created()); 
         comments.add(comment); 
        } 

        photo.setComments(comments); 
        mPhotos.add(photo); 
       } 
       if(count >= mFollowing.size() -1){ 
        //display our photos 
        displayPhotos(); 
       } 
      } 

      @Override 
      public void onCancelled(DatabaseError databaseError) { 

      } 
     }); 
    } 
} 

private void displayPhotos(){ 
    mPaginatedPhotos = new ArrayList<>(); 
    if(mPhotos != null){ 
     try{ 
      Collections.sort(mPhotos, new Comparator<Photo>() { 
       @Override 
       public int compare(Photo o1, Photo o2) { 
        return o2.getDate_created().compareTo(o1.getDate_created()); 
       } 
      }); 

      int iterations = mPhotos.size(); 

      if(iterations > 10){ 
       iterations = 10; 
      } 

      mResults = 10; 
      for(int i = 0; i < iterations; i++){ 
       mPaginatedPhotos.add(mPhotos.get(i)); 
      } 

      mAdapter = new MainfeedListAdapter(getActivity(), R.layout.layout_mainfeed_listitem, mPaginatedPhotos); 
      mListView.setAdapter(mAdapter); 

     }catch (NullPointerException e){ 
      Log.e(TAG, "displayPhotos: NullPointerException: " + e.getMessage()); 
     }catch (IndexOutOfBoundsException e){ 
      Log.e(TAG, "displayPhotos: IndexOutOfBoundsException: " + e.getMessage()); 
     } 
    } 
} 

public void displayMorePhotos(){ 
    Log.d(TAG, "displayMorePhotos: displaying more photos"); 

    try{ 

     if(mPhotos.size() > mResults && mPhotos.size() > 0){ 

      int iterations; 
      if(mPhotos.size() > (mResults + 10)){ 
       Log.d(TAG, "displayMorePhotos: there are greater than 10 more photos"); 
       iterations = 10; 
      }else{ 
       Log.d(TAG, "displayMorePhotos: there is less than 10 more photos"); 
       iterations = mPhotos.size() - mResults; 
      } 

      //add the new photos to the paginated results 
      for(int i = mResults; i < mResults + iterations; i++){ 
       mPaginatedPhotos.add(mPhotos.get(i)); 
      } 
      mResults = mResults + iterations; 
      mAdapter.notifyDataSetChanged(); 
     } 
    }catch (NullPointerException e){ 
     Log.e(TAG, "displayPhotos: NullPointerException: " + e.getMessage()); 
    }catch (IndexOutOfBoundsException e){ 
     Log.e(TAG, "displayPhotos: IndexOutOfBoundsException: " + e.getMessage()); 
    } 
} 

} 오히려 일반적인 전체 샘플 코드를 요청보다 구체적인 질문을 할 수있는 경우