在我的软件中我需要一个查询，如何查询数据库中的2个信息？我需要“uid”和“book”，查看用于观看我的数据库的链接：https://i.stack.imgur.com/9TSt6.png
listWN = (RecyclerView) findViewById(R.id.listReading);
listWN.setLayoutManager(new LinearLayoutManager(this));
bookYouAreIn = getIntent().getStringExtra("book");
firebaseauth = FirebaseAuth.getInstance();
String currentUserId = firebaseauth.getCurrentUser().getUid();
mDatabase = FirebaseDatabase.getInstance().getReference("Data");
mQuery = mDatabase.orderByChild("book").equalTo(bookYouAreIn); **---> HOW DO I ADD HERE: AND mDatabase.orderByChild("uid").equalTo(firebaseauth.getCurrentUser().getUid());**
mDatabase.keepSynced(true);
if(!firebaseauth.getCurrentUser().getUid().equals(currentUserId)){
startActivity(new Intent(WordNote.this,LoginActivity.class));
finish();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main_secondmenu, menu);
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if(item.getItemId() == R.id.action_addWords){
Intent postIntent = new Intent(WordNote.this, PostActivity.class);
postIntent.putExtra("bookToPost", bookYouAreIn);
startActivity(postIntent);
}
return super.onOptionsItemSelected(item);
}
@Override
protected void onStart() {
super.onStart();
final FirebaseRecyclerAdapter<MyReading, MyReadingViewHolder> firebaseRecyclerAdapter = new FirebaseRecyclerAdapter <MyReading, MyReadingViewHolder>
(
MyReading.class,
R.layout.list_reading,
MyReadingViewHolder.class,
mQuery )
{
@Override
protected void populateViewHolder(final MyReadingViewHolder viewHolder, final MyReading model, final int position) {
final String wordNote_key = getRef(position).getKey();
viewHolder.setWord(model.getWord());
viewHolder.setNote(model.getNote());
mDatabase.child(wordNote_key).addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
String user = (String) dataSnapshot.child("uid").getValue();
String bookNow = (String) dataSnapshot.child("book").getValue();
if(firebaseauth.getCurrentUser().getUid().equals(user)){
mDatabase.child(wordNote_key).orderByChild("uid").equals(user);
}
else {
viewHolder.nView.setVisibility(View.GONE); **--> IT DOESN'T GO AWAY, IT KEEPS STAYING AS A BLANK VIEW**
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
viewHolder.nView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent singleIntent = new Intent(WordNote.this, HandleWordNote.class);
singleIntent.putExtra("listWords", wordNote_key);
startActivity(singleIntent);
}
});
}
};
listWN.setAdapter(firebaseRecyclerAdapter);