问题
I am struggling to make a tie between my users in Firebase, and data that I want it to be linked to.
At the moment I am able to create users and log in with users credentials. Additionally, I am able to create Maintenance Issues using my MaintenanceActivity.
However, when I log in with an arbitrary user, the same maintenance issues will always show.
I am unsure how to link the User ID of each user to a maintenance issue, so that when a user logs in only their maintenance issues will show.
Totally unsure on where to start here, so any help would be much appreciated. Been struggling with this for a few days.
SignUpActivity
This creates users in the 'Users' table in my Firebase database, but I also want it to contain the User ID which can be linked to maintenance issues.
mDatabase = FirebaseDatabase.getInstance().getReference().child("users");
final DatabaseReference[] ref = new DatabaseReference[1];
final FirebaseUser[] mCurrentUser = new FirebaseUser[1];
mAuth.createUserWithEmailAndPassword(email, password)
.addOnCompleteListener(SignUpActivity.this, new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
Toasty.info(getApplicationContext(), "creation of account was: " + task.isSuccessful(), Toast.LENGTH_SHORT).show();
if (task.isSuccessful()) {
mCurrentUser[0] = task.getResult().getUser();
ref[0] =mDatabase.child(mCurrentUser[0].getUid());
ref[0].child("email").setValue(email);
Intent intent = new Intent(SignUpActivity.this, MainActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
}
}
});
MaintenanceActvity
public class MaintenanceActivity extends AppCompatActivity {
EditText editTextTitle;
EditText editTextDesc;
Spinner spinnerPrimary;
Spinner spinnerSecondary;
Spinner spinnerProperty;
Button buttonSubmit;
DatabaseReference databaseMaintenance;
ListView listViewIssues;
List<Maintenance> maintenanceList;
FirebaseDatabase database = FirebaseDatabase.getInstance();
DatabaseReference fDatabaseRoot = database.getReference();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maintenance);
Toolbar toolbar = (Toolbar) findViewById(R.id.actionBar);
setSupportActionBar(toolbar);
ActionBar ab = getSupportActionBar();
ab.setDisplayHomeAsUpEnabled(true);
databaseMaintenance = FirebaseDatabase.getInstance().getReference("maintenance");
editTextTitle = (EditText) findViewById(R.id.editTextTitle);
editTextDesc = (EditText) findViewById(R.id.editTextDesc);
buttonSubmit = (Button) findViewById(R.id.buttonSubmit);
spinnerPrimary = (Spinner) findViewById(R.id.spinnerPrimary);
spinnerSecondary = (Spinner) findViewById(R.id.spinnerSecondary);
spinnerProperty = (Spinner) findViewById(R.id.spinnerProperty);
listViewIssues = (ListView) findViewById(R.id.listViewIssues);
maintenanceList = new ArrayList<>();
buttonSubmit.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
addMaintenance();
}
});
listViewIssues.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
@Override
public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
Maintenance maintenance = maintenanceList.get(position);
showMoreInfoDialog(maintenance.getMaintenanceId(), maintenance.getMaintenanceTitle(), maintenance.getMaintenanceDescription(), maintenance.getMaintenancePrimary(), maintenance.getMaintenanceSecondary(), maintenance.getMaintenanceProperty());
return false;
}
});
}
@Override
protected void onStart() {
super.onStart();
databaseMaintenance.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
maintenanceList.clear();
for(DataSnapshot maintenanceSnapshot : dataSnapshot.getChildren()){
Maintenance maintenance = maintenanceSnapshot.getValue(Maintenance.class);
maintenanceList.add(maintenance);
}
MaintenanceList adapter = new MaintenanceList (MaintenanceActivity.this, maintenanceList);
listViewIssues.setAdapter(adapter);
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
fDatabaseRoot.child("properties").addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
// Is better to use a List, because you don't know the size
// of the iterator returned by dataSnapshot.getChildren() to
// initialize the array
final List<String> propertyAddressList = new ArrayList<String>();
for (DataSnapshot addressSnapshot: dataSnapshot.getChildren()) {
String propertyAddress = addressSnapshot.child("propertyAddress").getValue(String.class);
if (propertyAddress!=null){
propertyAddressList.add(propertyAddress);
}
}
Spinner spinnerProperty = (Spinner) findViewById(R.id.spinnerProperty);
ArrayAdapter<String> addressAdapter = new ArrayAdapter<String>(MaintenanceActivity.this, android.R.layout.simple_spinner_item, propertyAddressList);
addressAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinnerProperty.setAdapter(addressAdapter);
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
private void showMoreInfoDialog(final String id, String maintenanceTitle, String maintenanceDescription, String maintenancePrimary, String maintenanceSecondary, String maintenanceProperty) {
AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this);
LayoutInflater inflater = getLayoutInflater();
final View dialogView = inflater.inflate(R.layout.more_info_dialog, null);
dialogBuilder.setView(dialogView);
final EditText editTextTitle = (EditText) dialogView.findViewById(R.id.editTextTitle);
final EditText editTextDesc = (EditText) dialogView.findViewById(R.id.editTextDesc);
final Button buttonUpdate = (Button) dialogView.findViewById(R.id.buttonUpdate);
final Spinner spinnerPrimary = (Spinner) dialogView.findViewById(R.id.spinnerPrimary);
final Spinner spinnerSecondary = (Spinner) dialogView.findViewById(R.id.spinnerSecondary);
final Spinner spinnerProperty = (Spinner) dialogView.findViewById(R.id.spinnerProperty);
final Button buttonDelete = (Button) dialogView.findViewById(R.id.buttonDelete);
dialogBuilder.setTitle("Updating Maintenance " + maintenanceTitle);
final AlertDialog alertDialog = dialogBuilder.create();
alertDialog.show();
buttonUpdate.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String title = editTextTitle.getText().toString().trim();
String desc = editTextDesc.getText().toString().trim();
String primary = spinnerPrimary.getSelectedItem().toString();
String secondary = spinnerSecondary.getSelectedItem().toString();
String property = spinnerProperty.getSelectedItem().toString();
if(TextUtils.isEmpty(title)){
editTextTitle.setError("Title Required");
return;
}
updateMaintenance(title, desc, id, primary, secondary, property);
alertDialog.dismiss();
}
});
private boolean updateMaintenance(String title, String desc, String id, String primary, String secondary, String property) {
DatabaseReference databaseReference = FirebaseDatabase.getInstance().getReference("maintenance").child(id);
Maintenance maintenance = new Maintenance (id, title, desc, primary, secondary, property);
databaseReference.setValue(maintenance);
Toast.makeText(this, "Maintenance Updated Updated Successfully", Toast.LENGTH_LONG).show();
return true;
}
private void addMaintenance(){
String title = editTextTitle.getText().toString().trim();
String desc = editTextDesc.getText().toString().trim();
String primary = spinnerPrimary.getSelectedItem().toString();
String secondary = spinnerSecondary.getSelectedItem().toString();
String property = spinnerProperty.getSelectedItem().toString();
if(!TextUtils.isEmpty(title)){
String id = databaseMaintenance.push().getKey();
Maintenance maintenance = new Maintenance (id, title, desc, primary, secondary, property);
databaseMaintenance.child(id).setValue(maintenance);
Toast.makeText(this, "Maintenance Added", Toast.LENGTH_LONG).show();
} else {
Toast.makeText(this, "You must enter a maintenance record", Toast.LENGTH_LONG).show();
}
}
}
Firebase Database
Database Rules are as follows:
{
"rules": {
"users": {
"$uid": {
".write": "$uid === auth.uid",
".read": "$uid === auth.uid"
}
}
}
}
回答1:
A basic approach that u can take is have a User Id for every maintenance node that you push.
So as per your firebase database you have a user ID "bfPG...." This id can be the parent node for every maintenance record.
If you change this line to this
String id = databaseMaintenance.push().getKey();
this
String id = FirebaseAuth.getInstance().getCurrentUser().getUID(); //Check Syntax
you'll be pushing a maintenance record under a user ID and you can then differentiate maintenance records with different users.
Thus in order to get the records for a specific user you have to change your firebase query.
databaseMaintenance = FirebaseDatabase.getInstance().getReference("maintenance").orderByKey().equalTo(id);
https://firebase.google.com/docs/database/android/lists-of-data
check the link about how to filter records.
Another approach is you have an adapter to which you are adding maintenance records so before you add a record you can check if it belongs to the current user or not and add records accordingly.
来源：https://stackoverflow.com/questions/49282509/authenticated-users-accessing-their-data-using-firebase-for-android