如何在Social Media Android App中检索用户个人资料上的博客？

这是16的“建立一个社交媒体应用程序在Android工作室”教程中的一部分，我们将要在本文中介绍了以下功能：

• 我们将检索用户在其个人资料片段上撰写的博客。
• 如前所述，我们已经在个人资料片段中添加了用户数据，例如电子邮件，姓名和个人资料图片。
• 在这里，我们还将检索由当前用户在其个人资料上撰写的博客。
• 让我们看一下显示当前用户撰写的博客的实现。

分步实施

步骤1：使用fragment_profile.xml文件

在这里，我们添加了RecyclerView来查看当前用户发布的博客。

步骤2：使用ProfileFragment。 Java文件

在这里，我们将从Posts节点检索值，以使当前用户的uid等于拥有帖子的用户的uid。

DatabaseReference databaseReference=FirebaseDatabase.getInstance().getReference("Posts");
Query query=databaseReference.orderByChild("uid").equalTo(uid);

下面是ProfileFragment的代码。 Java文件。

Java

package com.example.socialmediaapp;
  
import android.app.ProgressDialog;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
  
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
  
import com.bumptech.glide.Glide;
import com.google.android.material.floatingactionbutton.FloatingActionButton;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
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 com.google.firebase.storage.StorageReference;
  
import java.util.ArrayList;
import java.util.List;
  
/**
 * A simple {@link Fragment} subclass.
 */
public class ProfileFragment extends Fragment {
  
    private FirebaseAuth firebaseAuth;
    FirebaseUser firebaseUser;
    FirebaseDatabase firebaseDatabase;
    DatabaseReference databaseReference;
    ImageView avatartv, covertv;
    TextView nam, email, phone;
    RecyclerView postrecycle;
    StorageReference storageReference;
    String storagepath = "Users_Profile_Cover_image/";
    FloatingActionButton fab;
    List posts;
    AdapterPosts adapterPosts;
    String uid;
    ProgressDialog pd;
    private static final int CAMERA_REQUEST = 100;
    private static final int STORAGE_REQUEST = 200;
    private static final int IMAGEPICK_GALLERY_REQUEST = 300;
    private static final int IMAGE_PICKCAMERA_REQUEST = 400;
    String cameraPermission[];
    String storagePermission[];
    Uri imageuri;
  
    public ProfileFragment() {
        // Required empty public constructor
    }
  
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
  
        // Inflate the layout for this fragment
        View view = inflater.inflate(R.layout.fragment_profile, container, false);
  
        firebaseAuth = FirebaseAuth.getInstance();
        firebaseUser = firebaseAuth.getCurrentUser();
        firebaseDatabase = FirebaseDatabase.getInstance();
        databaseReference = firebaseDatabase.getReference("Users");
        avatartv = view.findViewById(R.id.avatartv);
        nam = view.findViewById(R.id.nametv);
        email = view.findViewById(R.id.emailtv);
        uid = FirebaseAuth.getInstance().getUid();
        fab = view.findViewById(R.id.fab);
        postrecycle = view.findViewById(R.id.recyclerposts);
        posts = new ArrayList<>();
        pd = new ProgressDialog(getActivity());
        loadMyPosts();
        pd.setCanceledOnTouchOutside(false);
  
        // Retrieving user data from firebase
        Query query = databaseReference.orderByChild("email").equalTo(firebaseUser.getEmail());
        query.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                for (DataSnapshot dataSnapshot1 : dataSnapshot.getChildren()) {
                    String name = "" + dataSnapshot1.child("name").getValue();
                    String emaill = "" + dataSnapshot1.child("email").getValue();
                    String image = "" + dataSnapshot1.child("image").getValue();
                    nam.setText(name);
                    email.setText(emaill);
                    try {
                        Glide.with(getActivity()).load(image).into(avatartv);
                    } catch (Exception e) {
  
                    }
                }
            }
  
            @Override
            public void onCancelled(@NonNull DatabaseError databaseError) {
  
            }
        });
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(getActivity(), EditProfilePage.class));
            }
        });
        return view;
    }
  
    private void loadMyPosts() {
        LinearLayoutManager layoutManager = new LinearLayoutManager(getActivity());
        layoutManager.setReverseLayout(true);
        layoutManager.setStackFromEnd(true);
        postrecycle.setLayoutManager(layoutManager);
  
        DatabaseReference databaseReference = FirebaseDatabase.getInstance().getReference("Posts");
        Query query = databaseReference.orderByChild("uid").equalTo(uid);
        query.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                posts.clear();
                for (DataSnapshot dataSnapshot1 : dataSnapshot.getChildren()) {
                    ModelPost modelPost = dataSnapshot1.getValue(ModelPost.class);
                    posts.add(modelPost);
                    adapterPosts = new AdapterPosts(getActivity(), posts);
                    postrecycle.setAdapter(adapterPosts);
                }
            }
  
            @Override
            public void onCancelled(@NonNull DatabaseError databaseError) {
  
                Toast.makeText(getActivity(), databaseError.getMessage(), Toast.LENGTH_LONG).show();
            }
        });
    }
  
    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        setHasOptionsMenu(true);
        super.onCreate(savedInstanceState);
    }
}

输出：

对于本文中使用的所有可绘制文件，请参考以下链接： https://drive.google.com/drive/folders/1M_knOH_ugCuwSP5nkYzeD4dRp-Honzbe?usp=sharing

下面是执行这些操作后的最终文件结构：

该项目的GitHub链接： https : //github.com/Anni1123/SocialMediaPlatform