我的 MainActivity.java 代码中有一个问题，我在其中显示所有用户帖子，问题出在我的 onStart() 方法中，当我将 FirebaseRecyclerAdapter 放入 onStart() 方法中时，onStart() 不会调用 CheckUserExistence()方法位于 OnStart() 方法中，该方法将用户引导至 SetUpActivity.java，一旦我删除 FirebaseRecyclerAdapter，它就可以正常工作，意味着它调用 CheckUserExistence() 方法并完美地转到 SetupActivity，出了什么问题，我不能弄清楚，请帮忙-
这是 MainActivity.java 中我遇到问题的特定代码部分 -
protected void onStart() {
super.onStart();
FirebaseUser currentUser = mAuth.getCurrentUser();
if (currentUser == null) {
SendUserToLoginActivity();
} else {
CheckUserExistence();
}
Query SortPostsInDescendingOrder = PostsRef.orderByChild("counter");
FirebaseRecyclerOptions<Posts> options = new FirebaseRecyclerOptions.Builder<Posts>().setQuery(SortPostsInDescendingOrder, Posts.class).build();
FirebaseRecyclerAdapter<Posts, PostsViewHolder> firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<Posts, PostsViewHolder>
(options) {
@Override
protected void onBindViewHolder(@NonNull PostsViewHolder postsViewHolder, int i, @NonNull Posts posts) {
final String PostKey = getRef(i).getKey();
postsViewHolder.username.setText(posts.getFullname());
postsViewHolder.PostTime.setText(posts.getTime());
postsViewHolder.PostDate.setText(posts.getDate());
postsViewHolder.PostDescription.setText(posts.getDescription());
Picasso.get().load(posts.getProfileimage()).into(postsViewHolder.image);
Picasso.get().load(posts.getPostimage()).into(postsViewHolder.Postimage);
postsViewHolder.setLikeButtonStatus(PostKey);
postsViewHolder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent clickPostIntent = new Intent(MainActivity.this, ClickPostActivity.class);
clickPostIntent.putExtra("PostKey", PostKey);
startActivity(clickPostIntent);
}
});
postsViewHolder.LikePostButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
LikeChecker = true;
LikesRef.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot snapshot) {
if(LikeChecker.equals(true))
{
if(snapshot.child(PostKey).hasChild(currentUserID))
{
LikesRef.child(PostKey).child(currentUserID).removeValue();
LikeChecker = false;
}
else
{
LikesRef.child(PostKey).child(currentUserID).setValue(true);
LikeChecker = false;
}
}
}
@Override
public void onCancelled(@NonNull DatabaseError error) {
}
});
}
});
}
@NonNull
@Override
public PostsViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.all_posts_layout, parent, false);
PostsViewHolder viewHolder = new PostsViewHolder(view);
return viewHolder;
}
};
postList.setAdapter(firebaseRecyclerAdapter);
firebaseRecyclerAdapter.startListening();
updateUserStatus("online");
}
private void CheckUserExistence() {
final String current_user_id = mAuth.getCurrentUser().getUid();
UsersRef.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot snapshot) {
if (!snapshot.hasChild(current_user_id)) {
SendUserToSetupActivity();
}
}
@Override
public void onCancelled(@NonNull DatabaseError error) {
}
});
}
private void SendUserToSetupActivity() {
Intent setupIntent = new Intent(MainActivity.this, SetupActivity.class);
setupIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(setupIntent);
finish();
}
我从 onStart() 方法中删除了 FirebaseRecyclerAdapter，它工作正常，这意味着它引导用户访问 SetupActivity.java，按照预期代码，我还尝试扩展 MainActivity。 java 并做了另一个活动只是为了显示帖子，这样 onStart 就不会冲突，但这是完全错误的，因为我的应用程序甚至没有启动。
当我从 onStart 方法中删除 FirebaseRecyclerAdapter 时，onStart() 方法工作正常，这意味着它会将用户引导至 SetupActivity.java 作为预期代码 -
protected void onStart() {
super.onStart();
FirebaseUser currentUser = mAuth.getCurrentUser();
if (currentUser == null) {
SendUserToLoginActivity();
} else {
CheckUserExistence();
}
}
private void CheckUserExistence() {
final String current_user_id = mAuth.getCurrentUser().getUid();
UsersRef.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
if (!dataSnapshot.hasChild(current_user_id)) {
SendUserToSetupActivity();
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
但是当我在 onStart() 方法中添加 FirebaseRecyclerAdapter 时，它无法按预期工作意味着它没有进入 SetupActivity.java -
protected void onStart() {
super.onStart();
FirebaseUser currentUser = mAuth.getCurrentUser();
if (currentUser == null) {
SendUserToLoginActivity();
} else {
CheckUserExistence();
}
Query SortPostsInDescendingOrder = PostsRef.orderByChild("counter");
FirebaseRecyclerOptions<Posts> options = new FirebaseRecyclerOptions.Builder<Posts>().setQuery(SortPostsInDescendingOrder, Posts.class).build();
FirebaseRecyclerAdapter<Posts, PostsViewHolder> firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<Posts, PostsViewHolder>
(options) {
@Override
protected void onBindViewHolder(@NonNull PostsViewHolder postsViewHolder, int i, @NonNull Posts posts) {
final String PostKey = getRef(i).getKey();
postsViewHolder.username.setText(posts.getFullname());
postsViewHolder.PostTime.setText(posts.getTime());
postsViewHolder.PostDate.setText(posts.getDate());
postsViewHolder.PostDescription.setText(posts.getDescription());
Picasso.get().load(posts.getProfileimage()).into(postsViewHolder.image);
Picasso.get().load(posts.getPostimage()).into(postsViewHolder.Postimage);
postsViewHolder.setLikeButtonStatus(PostKey);
postsViewHolder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent clickPostIntent = new Intent(MainActivity.this, ClickPostActivity.class);
clickPostIntent.putExtra("PostKey", PostKey);
startActivity(clickPostIntent);
}
});
postsViewHolder.LikePostButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
LikeChecker = true;
LikesRef.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot snapshot) {
if(LikeChecker.equals(true))
{
if(snapshot.child(PostKey).hasChild(currentUserID))
{
LikesRef.child(PostKey).child(currentUserID).removeValue();
LikeChecker = false;
}
else
{
LikesRef.child(PostKey).child(currentUserID).setValue(true);
LikeChecker = false;
}
}
}
@Override
public void onCancelled(@NonNull DatabaseError error) {
}
});
}
});
}
@NonNull
@Override
public PostsViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.all_posts_layout, parent, false);
PostsViewHolder viewHolder = new PostsViewHolder(view);
return viewHolder;
}
};
postList.setAdapter(firebaseRecyclerAdapter);
firebaseRecyclerAdapter.startListening();
updateUserStatus("online");
}
private void CheckUserExistence() {
final String current_user_id = mAuth.getCurrentUser().getUid();
UsersRef.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot snapshot) {
if (!snapshot.hasChild(current_user_id)) {
SendUserToSetupActivity();
}
}
@Override
public void onCancelled(@NonNull DatabaseError error) {
}
});
}
请帮忙。请详细告诉我我的代码哪里出了问题，并进行适当的代码改进和详细实现。
我已经解决了这个错误，我一直在寻找将用户从Mainactivity发送到SetupActivity的方法，但后来我决定可以将用户直接从LoginActivity发送到SetupActivity，不需要使用可以使用常识的复杂实践。