我想在数据库中存储值，当我尝试运行应用程序时，它给了我一个错误。我是android studio的新手。
这是我的班级，点击了一个按钮：
public class MenuActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener,
OnMapReadyCallback {
ImageButton fakeCallBtn;
Button mRescue;
ImageButton notif;
ImageButton flash;
private Double lati;
private GoogleMap mMap;
LocationManager locationManager;
private DatabaseReference mRootRef;
private String mCurrentUserId;
private String userName;
private DatabaseReference user_id;
private String mChatUser;
private String message;
private FirebaseAuth mAuth;
private DatabaseReference mUserRef;
LocationTrack locationTrack;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_menu);
mRootRef = FirebaseDatabase.getInstance().getReference();
mAuth = FirebaseAuth.getInstance();
mCurrentUserId = mAuth.getCurrentUser().getUid();
user_id = FirebaseDatabase.getInstance().getReference().child("Users").child(mCurrentUserId);
mChatUser = user_id.getRef().toString();
mRescue = (Button)findViewById(R.id.rescue);
mRescue.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
addEmergencyMessage();
addEmergencyChat();
}
});
fakeCallBtn = (ImageButton) findViewById(R.id.fake_callbtn);
fakeCallBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent fakecallIntent = new Intent(MenuActivity.this, FakeCalling.class);
startActivity(fakecallIntent);
}
});
flash = (ImageButton) findViewById(R.id.flash);
flash.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent flashIntent = new Intent(MenuActivity.this, FlashLight.class);
startActivity(flashIntent);
}
});
notif = (ImageButton) findViewById(R.id.notification_btn);
notif.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent notificationIntent = new Intent(MenuActivity.this, Notifications.class);
startActivity(notificationIntent);
}
});
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setTitle("RescueX ");
if (mAuth.getCurrentUser() != null) {
mUserRef = FirebaseDatabase.getInstance().getReference().child("Users").child(mAuth.getCurrentUser().getUid());
mUserRef.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
userName = dataSnapshot.child("name").getValue().toString();
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
Log.e("fist","error");
return ;
}
if (locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER)) {
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, new LocationListener() {
@Override
public void onLocationChanged(Location location) {
//get latitude
double latitude = location.getLatitude();
//get longitude
double longitude = location.getLongitude();
LatLng latLng = new LatLng(latitude, longitude);
Geocoder geocoder = new Geocoder(getApplicationContext());
try {
List<Address> addressList = geocoder.getFromLocation(latitude, longitude, 1);
String str = addressList.get(0).getCountryName() + ",";
str += addressList.get(0).getLocality();
mMap.addMarker(new MarkerOptions().position(latLng).title(str));
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(latLng, 10.2f));
} catch (IOException e) {
e.printStackTrace();
}
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
Intent intent = new Intent(android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivity(intent);
}
});
}
}
private void addEmergencyChat() {
locationTrack = new LocationTrack(MenuActivity.this);
if (locationTrack.canGetLocation()) {
double longitude = locationTrack.getLongitude();
double latitude = locationTrack.getLatitude();
String current_user_ref="Emergency_Messages/"+mCurrentUserId+"/"+mChatUser;
String chat_user_ref= "Emergency_Messages/"+mChatUser+"/"+mCurrentUserId;
DatabaseReference chat_push_key = mRootRef.child("Emergency_Messages").child(mCurrentUserId).
child(mChatUser).push();
String push_key = chat_push_key.getKey();
Map messageMap = new HashMap();
messageMap.put("userName", userName);
messageMap.put("latitude",latitude);
messageMap.put("longitude", longitude);
messageMap.put("from",mCurrentUserId);
messageMap.put("seen",false);
messageMap.put("time", ServerValue.TIMESTAMP);
Map messageUserMap = new HashMap();
messageUserMap.put(current_user_ref+ "/"+push_key,messageMap);
messageUserMap.put(chat_user_ref+ "/"+push_key,messageMap);
mRootRef.updateChildren(messageUserMap, new DatabaseReference.CompletionListener() {
@Override
public void onComplete(DatabaseError databaseError, DatabaseReference databaseReference) {
if(databaseError!=null){
Log.d("TAG",databaseError.getMessage().toString());
}
}
});
} else {
locationTrack.showSettingsAlert();
}
}
private void addEmergencyMessage() {
mRootRef.child("Emergency_Chat").child(mCurrentUserId).addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
if(!dataSnapshot.hasChild(mChatUser)){
Map chatAddMap = new HashMap();
chatAddMap.put("seen",false);
chatAddMap.put("timestamp", ServerValue.TIMESTAMP);
Map chatUserMap = new HashMap();
chatUserMap.put("Emergency_Chat/"+mCurrentUserId+"/"+mChatUser, chatAddMap);
chatUserMap.put("Emergency_Chat/"+mChatUser+"/"+mCurrentUserId, chatAddMap);
mRootRef.updateChildren(chatUserMap, new DatabaseReference.CompletionListener() {
@Override
public void onComplete(DatabaseError databaseError, DatabaseReference databaseReference) {
if(databaseError!= null){
Toast.makeText(MenuActivity.this, "Error: "+databaseError.getMessage(), Toast.LENGTH_SHORT).show();
}
}
});
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
@Override
public void onStart() {
super.onStart();
// Check if user is signed in (non-null) and update UI accordingly.
FirebaseUser currentUser = mAuth.getCurrentUser();
if(currentUser == null){
sendToStart();
} else {
mUserRef.child("online").setValue("true");
}
}
@Override
protected void onStop() {
super.onStop();
FirebaseUser currentUser = mAuth.getCurrentUser();
if(currentUser != null) {
mUserRef.child("online").setValue(ServerValue.TIMESTAMP);
}
}
private void sendToStart() {
Intent startIntent = new Intent(MenuActivity.this, Home.class);
startActivity(startIntent);
finish();
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
}
@Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
super.onOptionsItemSelected(item);
if(item.getItemId()== R.id.log_out){
FirebaseAuth.getInstance().signOut();
sendToStart();
}
//noinspection SimplifiableIfStatement
if (item.getItemId() == R.id.action_settings) {
Intent notifIntent= new Intent(MenuActivity.this, Settings.class);
startActivity(notifIntent);
}
if(item.getItemId() == R.id.all_users){
Intent usersIntent= new Intent(MenuActivity.this, UsersActivity.class);
startActivity(usersIntent);
}
return true;
}
@Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_profile_layout) {
Intent searchIntent = new Intent(MenuActivity.this, Profile.class);
startActivity(searchIntent);
overridePendingTransition(R.anim.pull_in_right, R.anim.push_out_left);
} else if (id == R.id.nav_users_activity) {
Intent searchIntent = new Intent(MenuActivity.this, UsersActivity.class);
startActivity(searchIntent);
overridePendingTransition(R.anim.pull_in_right, R.anim.push_out_left);
} else if (id == R.id.nav_history_layout) {
Intent searchIntent = new Intent(MenuActivity.this, History.class);
startActivity(searchIntent);
overridePendingTransition(R.anim.pull_in_right, R.anim.push_out_left);
} else if (id == R.id.nav_help_layout) {
Intent searchIntent = new Intent(MenuActivity.this, Help.class);
startActivity(searchIntent);
overridePendingTransition(R.anim.pull_in_right, R.anim.push_out_left);
} else if (id == R.id.nav_feedback_layout) {
Intent searchIntent = new Intent(MenuActivity.this, Feedback.class);
startActivity(searchIntent);
overridePendingTransition(R.anim.pull_in_right, R.anim.push_out_left);
} else if (id == R.id.nav_signout_layout) {
Intent searchIntent = new Intent(MenuActivity.this, SignOut.class);
startActivity(searchIntent);
overridePendingTransition(R.anim.pull_in_right, R.anim.push_out_left);
} else if (id == R.id.nav_friends_layout) {
Intent searchIntent = new Intent(MenuActivity.this, FriendsActivity.class);
startActivity(searchIntent);
overridePendingTransition(R.anim.pull_in_right, R.anim.push_out_left);
} else if (id == R.id.nav_share) {
Intent searchIntent = new Intent(MenuActivity.this, Share.class);
startActivity(searchIntent);
overridePendingTransition(R.anim.pull_in_right, R.anim.push_out_left);
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
}
这是我的logcat
12-31 19:20:52.340 4357-4357/? E/Zygote: no v2
12-31 19:20:52.350 4357-4357/? E/SELinux: [DEBUG] get_category: variable
seinfo: default sensitivity: NULL, cateogry: NULL
12-31 19:20:56.044 4357-4357/com.rescuex_za.rescuex E/AndroidRuntime: FATAL
EXCEPTION: main
Process:
com.rescuex_za.rescuex, PID: 4357
com.google.firebase.database.DatabaseException: Invalid Firebase Database
path: https://rescuex-
8f9c9.firebaseio.com/Users/NcZ0McVHEuRfaMv39gHbDlpjI1X2. Firebase Database
paths must not contain '.', '#', '$', '[', or ']'
at
com.google.android.gms.internal.zzelv.zzqh(Unknown Source)
at
com.google.firebase.database.DatabaseReference.child(Unknown Source)
at
com.rescuex_za.rescuex.MenuActivity.addEmergencyChat(MenuActivity.java:232)
at
com.rescuex_za.rescuex.MenuActivity.access$100(MenuActivity.java:50)
at
com.rescuex_za.rescuex.MenuActivity$1.onClick(MenuActivity.java:92)
at
android.view.View.performClick(View.java:5076)
at
android.view.View$PerformClick.run(View.java:20279)
at
android.os.Handler.handleCallback(Handler.java:739)
at
android.os.Handler.dispatchMessage(Handler.java:95)
at
android.os.Looper.loop(Looper.java:135)
at
android.app.ActivityThread.main(ActivityThread.java:5910)
at
java.lang.reflect.Method.invoke(Native Method)
at
java.lang.reflect.Method.invoke(Method.java:372)
at
com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:1405 ） 在 com.android.internal.os.ZygoteInit.main（ZygoteInit.java:1200）
答案 0 :(得分：0)
检查您是否在firebase数据库中存储'.', '#', '$', '[', or ']'值。 firebase数据库不支持存储这些字符。
答案 1 :(得分：0)
双值包含'。'无法存储在firebase中的符号
这些行导致错误
double longitude = locationTrack.getLongitude();
double latitude = locationTrack.getLatitude();
messageMap.put("latitude",latitude);
messageMap.put("longitude", longitude);
您可以使用String.valueOf(longitude).replace(".", "*");存储此类值
后来在检索期间String.valueOf(longitude).replace("*", ".");
很抱歉语法错误....
longitude = String.valueOf(longitude).replace(".", "*");
存储此类值以及稍后检索
longitude = String.valueOf(longitude).replace("*", ".");