在类似WhatsApp的聊天应用程序中，我还添加了friend req功能，用户可以在其中与Firebase数据库成为好友。现在我的应用程序中的错误是：我不应该向自己发送朋友请求，它必须使按钮不可见，但我不知道该隐藏在哪里。我有点困惑。
控制我的应用程序的流程：
全新的应用安装-登录/注册（StartActivity）-重定向到MainActivty-在这里我设置菜单布局和onOptionsItemSelected（MenuItem项目）-这样就存在“所有用户”选项-从那里我选择任何特定用户（UsersActivity）-从而打开用户个人资料用户的身份（即ProfileActivity）-我将获得“发送好友请求”选项。
但是在所有用户活动中，我也会像其他用户一样显示在列表中，当我在个人资料上单击它时，它会显示与其他用户相同的内容，并且还显示了“发送朋友请求”选项。怎么藏起来
我附加了UsersActivity（包括所有吸引我的用户的位置）和ProfileActivity（特定的用户配置文件将打开的位置，在那里我可以获取send friend req选项）
UsersActivity.java
package com.jimmytrivedi.lapitchat;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import com.firebase.ui.database.FirebaseRecyclerAdapter;
import com.firebase.ui.database.FirebaseRecyclerOptions;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.Query;
import com.google.firebase.database.ServerValue;
import com.squareup.picasso.Picasso;
import de.hdodenhof.circleimageview.CircleImageView;
public class UsersActivity extends AppCompatActivity {
private Toolbar toolbar;
private RecyclerView recyclerView;
private DatabaseReference databaseReference, UserDatabaseReference;
private FirebaseAuth mAuth;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_users);
toolbar = findViewById(R.id.usersToolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setTitle("All Users");
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
mAuth = FirebaseAuth.getInstance();
UserDatabaseReference = FirebaseDatabase.getInstance().getReference().child("Users").child(mAuth.getCurrentUser().getUid());
databaseReference = FirebaseDatabase.getInstance().getReference().child("Users");
databaseReference.keepSynced(true);
recyclerView = findViewById(R.id.recyclerView);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(UsersActivity.this));
}
@Override
public void onStart() {
super.onStart();
startListening();
FirebaseUser currentUser = mAuth.getCurrentUser();
if (currentUser != null) {
UserDatabaseReference.child("Online").setValue("true");
}
}
@Override
protected void onPause() {
super.onPause();
FirebaseUser currentUser = mAuth.getCurrentUser();
if (currentUser != null) {
UserDatabaseReference.child("Online").setValue(ServerValue.TIMESTAMP);
}
}
public void startListening() {
Query query = FirebaseDatabase.getInstance()
.getReference()
.child("Users")
.limitToLast(50);
FirebaseRecyclerOptions<Users> options =
new FirebaseRecyclerOptions.Builder<Users>()
.setQuery(query, Users.class)
.build();
FirebaseRecyclerAdapter<Users, UsersViewHolder> firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<Users, UsersViewHolder>(options) {
@Override
protected void onBindViewHolder(@NonNull UsersViewHolder holder, int position, @NonNull Users users) {
holder.setName(users.getName());
holder.setStatus(users.getStatus());
holder.setThumbImage(users.getThumbImage());
final String userID = getRef(position).getKey();
holder.mView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(UsersActivity.this, ProfileActivity.class);
intent.putExtra("userID", userID);
startActivity(intent);
}
});
}
@NonNull
@Override
public UsersViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.users_single_layout, parent, false);
return new UsersViewHolder(view);
}
};
recyclerView.setAdapter(firebaseRecyclerAdapter);
firebaseRecyclerAdapter.startListening();
}
public static class UsersViewHolder extends RecyclerView.ViewHolder {
View mView;
public UsersViewHolder(View itemView) {
super(itemView);
mView = itemView;
}
public void setName(String name) {
TextView userName = mView.findViewById(R.id.userName);
userName.setText(name);
}
public void setStatus(String status) {
TextView userStatus = mView.findViewById(R.id.userStatus);
userStatus.setText(status);
}
public void setThumbImage(String thumbImage) {
CircleImageView circleImageView = mView.findViewById(R.id.userImage);
Picasso.get().load(thumbImage).placeholder(R.drawable.defaultimage)
.into(circleImageView);
}
}
}
ProfileActivity
package com.jimmytrivedi.lapitchat;
import android.app.ProgressDialog;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import com.google.android.gms.tasks.OnSuccessListener;
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.ServerValue;
import com.google.firebase.database.ValueEventListener;
import com.squareup.picasso.Picasso;
import java.text.DateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
public class ProfileActivity extends AppCompatActivity {
private TextView profileDisplayName, currentStatus, totalFriends;
private ImageView profileDisplayImage;
private Button sendFriendRequest, declineFriendRequest;
private DatabaseReference databaseReference, FriendDatabaseReference, FriendDatabase,
RootDatabaseReference, UserDatabaseReference;
private ProgressDialog progressDialog;
private String current_state;
private FirebaseUser currentUser;
private FirebaseAuth mAuth;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_profile);
final String userKey = getIntent().getStringExtra("userID");
databaseReference = FirebaseDatabase.getInstance().getReference().child("Users").child(userKey);
FriendDatabaseReference = FirebaseDatabase.getInstance().getReference().child("Friend Request");
FriendDatabase = FirebaseDatabase.getInstance().getReference().child("Friends");
currentUser = FirebaseAuth.getInstance().getCurrentUser();
RootDatabaseReference = FirebaseDatabase.getInstance().getReference();
mAuth = FirebaseAuth.getInstance();
UserDatabaseReference = FirebaseDatabase.getInstance().getReference().child("Users").child(mAuth.getCurrentUser().getUid());
profileDisplayName = findViewById(R.id.profileDisplayName);
currentStatus = findViewById(R.id.currentStatus);
totalFriends = findViewById(R.id.totalFriends);
profileDisplayImage = findViewById(R.id.profileDisplayImage);
sendFriendRequest = findViewById(R.id.sendFriendRequest);
declineFriendRequest = findViewById(R.id.declineFriendRequest);
declineFriendRequest.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
}
});
current_state = "not_friends";
declineFriendRequest.setVisibility(View.INVISIBLE);
declineFriendRequest.setEnabled(false);
progressDialog = new ProgressDialog(this);
progressDialog.setTitle("Loading user data");
progressDialog.setMessage("Please wait while we load the user data");
progressDialog.setCanceledOnTouchOutside(false);
progressDialog.show();
databaseReference.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
String displayName = dataSnapshot.child("Name").getValue().toString();
String displayStatus = dataSnapshot.child("Status").getValue().toString();
String displayImage = dataSnapshot.child("Image").getValue().toString();
profileDisplayName.setText(displayName);
currentStatus.setText(displayStatus);
Picasso.get().load(displayImage).placeholder(R.drawable.defaultimage).into(profileDisplayImage);
// ------------FRIENDS LIST / REQUEST FEATURE-------------
FriendDatabaseReference.child(currentUser.getUid()).addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
if (dataSnapshot.hasChild(userKey)) {
String req_type = dataSnapshot.child(userKey).child("Request Type")
.getValue().toString();
if (req_type.equals("receive")) {
current_state = "req_received";
sendFriendRequest.setText("Accept Friend Request");
declineFriendRequest.setVisibility(View.VISIBLE);
declineFriendRequest.setEnabled(true);
} else if (req_type.equals("sent")) {
current_state = "req_sent";
sendFriendRequest.setText("Cancel Friend Request");
declineFriendRequest.setVisibility(View.INVISIBLE);
declineFriendRequest.setEnabled(false);
}
progressDialog.dismiss();
} else {
FriendDatabase.child(currentUser.getUid()).addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
if (dataSnapshot.hasChild(userKey)) {
current_state = "friends";
sendFriendRequest.setText("Unfriend this person");
declineFriendRequest.setVisibility(View.INVISIBLE);
declineFriendRequest.setEnabled(false);
}
progressDialog.dismiss();
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
progressDialog.dismiss();
}
});
}
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
sendFriendRequest.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
sendFriendRequest.setEnabled(false);
// ------------NOT FRIENDS STATE-------------
if (current_state.equals("not_friends")) {
DatabaseReference NewNotificationDatabase = RootDatabaseReference.child("Notifications").child(userKey).push();
String newNotificationId = NewNotificationDatabase.getKey();
HashMap<String, String> notificationData = new HashMap<>();
notificationData.put("from", currentUser.getUid());
notificationData.put("type", "request");
Map requestMap = new HashMap();
requestMap.put("Friend Request/" + currentUser.getUid() + "/" + userKey + "/" + "Request Type", "sent");
requestMap.put("Friend Request/" + userKey + "/" + currentUser.getUid() + "/" + "Request Type", "receive");
requestMap.put("Notifications/" + userKey + "/" + newNotificationId, notificationData);
RootDatabaseReference.updateChildren(requestMap, new DatabaseReference.CompletionListener() {
@Override
public void onComplete(@Nullable DatabaseError databaseError, @NonNull DatabaseReference databaseReference) {
if (databaseError != null) {
Toast.makeText(ProfileActivity.this, "There was some error in sending request", Toast.LENGTH_SHORT).show();
} else {
current_state = "req_sent";
sendFriendRequest.setText("Cancel Friend Request");
}
sendFriendRequest.setEnabled(true);
}
});
}
// ------------CANCEL REQUEST STATE-------------
if (current_state.equals("req_sent")) {
FriendDatabaseReference.child(currentUser.getUid()).child(userKey).removeValue()
.addOnSuccessListener(new OnSuccessListener<Void>() {
@Override
public void onSuccess(Void aVoid) {
FriendDatabaseReference.child(userKey).child(currentUser.getUid())
.removeValue().addOnSuccessListener(new OnSuccessListener<Void>() {
@Override
public void onSuccess(Void aVoid) {
sendFriendRequest.setEnabled(true);
current_state = "not_friends";
sendFriendRequest.setText("Send Friend Request");
declineFriendRequest.setVisibility(View.INVISIBLE);
declineFriendRequest.setEnabled(false);
}
});
}
});
}
// ------------REQUEST RECEIVED STATE-------------
if (current_state.equals("req_received")) {
final String currentDate = DateFormat.getDateTimeInstance().format(new Date());
Map friendsMap = new HashMap();
friendsMap.put("Friends/" + currentUser.getUid() + "/" + userKey + "/date", currentDate);
friendsMap.put("Friends/" + userKey + "/" + currentUser.getUid() + "/date", currentDate);
friendsMap.put("Friend Request/" + currentUser.getUid() + "/" + userKey, null);
friendsMap.put("Friend Request/" + userKey + "/" + currentUser.getUid(), null);
RootDatabaseReference.updateChildren(friendsMap, new DatabaseReference.CompletionListener() {
@Override
public void onComplete(DatabaseError databaseError, DatabaseReference databaseReference) {
if (databaseError == null) {
sendFriendRequest.setEnabled(true);
current_state = "friends";
sendFriendRequest.setText("Unfriend this Person");
declineFriendRequest.setVisibility(View.INVISIBLE);
declineFriendRequest.setEnabled(false);
} else {
String error = databaseError.getMessage();
Toast.makeText(ProfileActivity.this, error, Toast.LENGTH_SHORT).show();
}
}
});
}
// ------------UNFRIEND STATE-------------
if (current_state.equals("friends")) {
Map unfriendMap = new HashMap();
unfriendMap.put("Friends/" + currentUser.getUid() + "/" + userKey, null);
unfriendMap.put("Friends/" + userKey + "/" + currentUser.getUid(), null);
RootDatabaseReference.updateChildren(unfriendMap, new DatabaseReference.CompletionListener() {
@Override
public void onComplete(DatabaseError databaseError, DatabaseReference databaseReference) {
if (databaseError == null) {
current_state = "not_friends";
sendFriendRequest.setText("Send Friend Request");
declineFriendRequest.setVisibility(View.INVISIBLE);
declineFriendRequest.setEnabled(false);
} else {
String error = databaseError.getMessage();
Toast.makeText(ProfileActivity.this, error, Toast.LENGTH_SHORT).show();
}
sendFriendRequest.setEnabled(true);
}
});
}
}
});
}
@Override
public void onStart() {
super.onStart();
FirebaseUser currentUser = mAuth.getCurrentUser();
if (currentUser != null) {
UserDatabaseReference.child("Online").setValue("true");
}
}
@Override
protected void onPause() {
super.onPause();
FirebaseUser currentUser = mAuth.getCurrentUser();
if (currentUser != null) {
UserDatabaseReference.child("Online").setValue(ServerValue.TIMESTAMP);
}
}
}
请用代码向我解释。感谢您的努力，也感谢您的帮助。感谢Priyanka！
最佳答案
在ProfileActivity中，找出您所显示的用户是否为登录用户（将您使用userKey与currentUser进行比较的用户）。如果是这样，请像这样隐藏sendFriendRequest：
sendFriendRequest.setVisibility(View.GONE);
另外，您可以禁用按钮：
sendFriendRequest.setEnabled(false);
关于java - 如何禁用向自身发送好友请求的按钮？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/51368237/