[英]Why declaring TextViews gloabally doesn't fetch data from Firebase
public void loadUserInformation() {
DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
final DatabaseReference usesrRef = rootRef.child("Users").child(Uid);
final ValueEventListener eventListener = new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
ImageView profilePic = (ImageView) findViewById(R.id.imageView);
for (DataSnapshot postSnapshot : dataSnapshot.getChildren()) {
String name = postSnapshot.child("Name").getValue().toString();
String status = postSnapshot.child("Status").getValue().toString();
String image = dataSnapshot.child("Image").getValue().toString();
Name.setText(name);
Status.setText(status);
Name.setVisibility(View.VISIBLE);
Status.setVisibility(View.VISIBLE);
Picasso.get().load(image).into(profilePic);
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
Toast.makeText(getApplicationContext(), "Error Loading UserDetails", Toast.LENGTH_LONG).show();
}
};
usesrRef.addListenerForSingleValueEvent(eventListener);
}
它在行上返回空指針異常...字符串名稱= postsnapshot:dataSnapshot.getChildren())
我知道如果我在onDatachange中聲明並初始化textviews會起作用...但是我希望在調用此方法之前textviews不可見...而在調用此方法時我希望它可見...我怎樣才能做到這一點?
發布您遇到的錯誤,
使您的textview最終,
並記住在命名變量時要遵循慣例(您的textview應該以小寫字母開頭)。
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.