在下面的代码中，片段将在scavengerHunt方法中关闭（出于某种原因）。我相信它与我在代码中使用valueEventListeners的方式有关，但我不太确定。如果我不尝试在这些方法中调用switch语句，片段将不会关闭，但我的逻辑也不会工作。请帮忙，如果需要更多代码，请告诉我。我真的很茫然，觉得我已经用我所拥有的一切来尝试，尽管事实并非如此。
public class scavengerHunt extends Fragment implements View.OnClickListener {
Button letsGo, submit;
ImageButton uploadImage;
TextView welcomeScav;
TextView instructions;
FirebaseAuth mAuth;
DatabaseReference mDatabase;
StorageReference mStorage;
private String user_id;
private String winner;
private static final int PICK_IMAGE = 1;
private Uri imageURI;
public scavengerHunt() {
// 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_scavenger_hunt, container, false);
//initialization code
letsGo = (Button) view.findViewById(R.id.scav_Button);
submit = (Button) view.findViewById(R.id.submit_Image);
uploadImage = (ImageButton) view.findViewById(R.id.scav_Pic);
winner = "complete";
welcomeScav = (TextView) view.findViewById(R.id.welcome_scav_Text);
instructions = (TextView) view.findViewById(R.id.instruction_Scav_Text);
mAuth = FirebaseAuth.getInstance();
user_id = mAuth.getCurrentUser().getUid();
mDatabase = FirebaseDatabase.getInstance().getReference().child("Users").child(user_id);
mStorage = FirebaseStorage.getInstance().getReference();
letsGo.setOnClickListener(this);
uploadImage.setOnClickListener(this);
submit.setOnClickListener(this);
submit.setClickable(false);
return view;
}
@Override
public void onClick(View v) {
if(v.getId() == R.id.scav_Button){
letsGo.setText("Find it!");
letsGo.setClickable(false);
scavengerHunt();
} else if(v.getId() == R.id.scav_Pic){
openGallery();
submit.setClickable(true);
} else if(v.getId() == R.id.submit_Image){
StorageReference filepath = mStorage.child("Scavenger Hunt Pictures").child(imageURI.getLastPathSegment());
filepath.putFile(imageURI).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
@Override
public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
Toast.makeText(getContext(), "Your offering has been accepted.", Toast.LENGTH_LONG).show();
letsGo.setText("Next Clue");
letsGo.setClickable(true);
submit.setClickable(false);
//@SuppressWarnings("VisibleForTests")
//The following commented out code is a template for saving the photo URL.
// Uri downloadUrl = taskSnapshot.getDownloadUrl();
//DatabaseReference newSpeaker = mDatabase.push();
//newSpeaker.child("name").setValue(name);
//newSpeaker.child("bio").setValue(bio);
//newSpeaker.child("photoURL").setValue(downloadUrl.toString());
}
});
}
}
public void scavengerHunt() {
//Get a snapshot of the database to see where the user is at on the clues.
mDatabase.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
//get the current value of scavenger hunt instructions
String currentInstruction = dataSnapshot.child("Scavenger Hunt Instructions").getValue(String.class);
//if this is the first time the user has started the scavenger hunt
if (dataSnapshot.child("Scavenger Hunt Instructions").getValue(String.class) == null) {
mDatabase.child("Scavenger Hunt Instructions").setValue(getInstruction("Start"));
updateInstructions();
} else
//if the user has finished the hunt
if (dataSnapshot.child("Scavenger Hunt Instructions").getValue(String.class) == "Winner") {
Toast.makeText(getContext(), "You have completed the challenge!", Toast.LENGTH_LONG).show();
//exit the fragment
} else {
//this is normal operation
//Change the database value to the next instruction
mDatabase.child("Scavenger Hunt Instructions").setValue(getInstruction(currentInstruction));
updateInstructions();
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
//TODO: Error catch
}
});
//maybe something needs to go here
}
private void updateInstructions(){
//Take a new (and freshly updated) snapshot
mDatabase.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
//Change the instruction text to the instruction the user needs to see.
instructions.setText(dataSnapshot.child("Scavenger Hunt Instructions").getValue(String.class));
}
@Override
public void onCancelled(DatabaseError databaseError) {
//TODO: Error catch
}
});
}
public String getInstruction(String current){
String instruction = current;
switch (current){
case "Start":
instruction = "Grab a drink with the Presidents of the United States";
break;
case "Grab a drink with the Presidents of the United States":
instruction = "Turns out Lincoln is a bit clingy. Go somewhere he wouldn't want to go.";
break;
case "Turns out Lincoln is a bit clingy. Go somewhere he wouldn't want to go.":
instruction = "Winner";
break;
}
return instruction;
}
private void openGallery(){
//Intent gallery = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.INTERNAL_CONTENT_URI);
//startActivityForResult(gallery, PICK_IMAGE);
Intent photoPickerIntent = new Intent(Intent.ACTION_GET_CONTENT);
photoPickerIntent.setType("image/*");
startActivityForResult(photoPickerIntent, PICK_IMAGE);
}
public void onActivityResult(int requestCode, int resultCode, Intent data){
super.onActivityResult(requestCode, resultCode, data);
if(resultCode == RESULT_OK && requestCode == PICK_IMAGE){
imageURI = data.getData();
uploadImage.setImageURI(imageURI);
}
}
}