I am new in java coding. I am getting this error "W/SyncTree: Listen at /users failed: DatabaseError: Permission denied" when I tried to follow the tutorial video where use Firebase to access the realtime database. The program does not showing the homeactivity after the login is done. And I tried to modified the rules in realtime database from false to true, it come out the other error of "E/AndroidRuntime: FATAL EXCEPTION: main PID17903". I tried to solve by searching for few days already but still cannot solve this problem.
Here is the main activity for my program.
package com.example.realtimelocationtracking10;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import android.Manifest;
import android.content.Intent;
import android.os.Bundle;
import android.widget.Toast;
import com.example.realtimelocationtracking10.HomeActivity;
import com.example.realtimelocationtracking10.Model.User;
import com.example.realtimelocationtracking10.Utils.Common;
import com.firebase.ui.auth.AuthUI;
import com.firebase.ui.auth.IdpResponse;
import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.firebase.FirebaseApp;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ValueEventListener;
import com.google.firebase.iid.FirebaseInstanceId;
import com.google.firebase.iid.InstanceIdResult;
import com.karumi.dexter.Dexter;
import com.karumi.dexter.PermissionToken;
import com.karumi.dexter.listener.PermissionDeniedResponse;
import com.karumi.dexter.listener.PermissionGrantedResponse;
import com.karumi.dexter.listener.PermissionRequest;
import com.karumi.dexter.listener.single.PermissionListener;
import java.util.Arrays;
import java.util.List;
import javax.xml.transform.Result;
import io.paperdb.Paper;
public class MainActivity extends AppCompatActivity {
DatabaseReference user_information;
private static final int MY_REQUEST_CODE = 7117;
List<AuthUI.IdpConfig> providers;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
FirebaseApp.initializeApp(this);
Paper.init(this);
//Init firebase
user_information = FirebaseDatabase.getInstance().getReference(Common.USER_INFORMATION);
//Init provider
providers = (List<AuthUI.IdpConfig>) Arrays.asList(
new AuthUI.IdpConfig.EmailBuilder().build(),
new AuthUI.IdpConfig.GoogleBuilder().build()
);
//Request permission location
Dexter.withActivity(this)
.withPermission(Manifest.permission.ACCESS_FINE_LOCATION)
.withListener(new PermissionListener() {
@Override
public void onPermissionGranted(PermissionGrantedResponse response) {
showSignInOptions();
}
@Override
public void onPermissionDenied(PermissionDeniedResponse response) {
Toast.makeText(MainActivity.this, "You must accept permission to use app", Toast.LENGTH_SHORT).show();
}
@Override
public void onPermissionRationaleShouldBeShown(PermissionRequest permissionRequest, PermissionToken permissionToken) {
}
}).check();
}
private void showSignInOptions() {
startActivityForResult(
AuthUI.getInstance()
.createSignInIntentBuilder()
.setAvailableProviders(providers)
.build(),MY_REQUEST_CODE);
}
//Ctrl + O
@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(requestCode == MY_REQUEST_CODE)
{
IdpResponse response = IdpResponse.fromResultIntent(data);
if (resultCode == RESULT_OK)
{
FirebaseUser firebaseUser = FirebaseAuth.getInstance().getCurrentUser();
//Check if user exists on database
user_information.orderByKey()
.equalTo(firebaseUser.getUid())
.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
if(dataSnapshot.getValue() == null) //If user not exists
{
if(!dataSnapshot.child(firebaseUser.getUid()).exists()) //if key uid is not exists
{
Common.loggedUser = new User(firebaseUser.getUid(), firebaseUser.getEmail());
//Add to database
user_information.child(Common.loggedUser.getUid())
.setValue(Common.loggedUser);
}
}
else //If user is available
{
Common.loggedUser = dataSnapshot.child(firebaseUser.getUid()).getValue(User.class);
}
//Save UID to storage to update location from background
//Paper.book().write(Common.USER_UID_SAVE_KEY, Common.loggedUser.getUid());
updateToken(firebaseUser);
setupUI();
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
}
}
}
private void setupUI() {
//Navigate Home
startActivity(new Intent(MainActivity.this, HomeActivity.class));
finish();
}
private void updateToken(final FirebaseUser firebaseUser) {
DatabaseReference tokens = FirebaseDatabase.getInstance()
.getReference(Common.TOKENS);
//Get Tokens
FirebaseInstanceId.getInstance().getInstanceId()
.addOnSuccessListener(new OnSuccessListener<InstanceIdResult>() {
@Override
public void onSuccess(InstanceIdResult instanceIdResult) {
tokens.child(firebaseUser.getUid())
.setValue(instanceIdResult.getToken());
}
}).addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
Toast.makeText(MainActivity.this, ""+e.getMessage(), Toast. LENGTH_SHORT).show();
}
});
}
}Here is my Home Activity code.
package com.example.realtimelocationtracking10;
import android.app.Notification;
import android.content.Intent;
import android.graphics.drawable.Icon;
import android.os.Bundle;
import android.view.Gravity;
import android.view.MenuItem;
import android.view.View;
import android.view.Menu;
import com.google.android.material.floatingactionbutton.FloatingActionButton;
import com.google.android.material.snackbar.Snackbar;
import com.google.android.material.navigation.NavigationView;
import androidx.appcompat.app.ActionBarDrawerToggle;
import androidx.core.view.GravityCompat;
import androidx.navigation.NavController;
import androidx.navigation.Navigation;
import androidx.navigation.ui.AppBarConfiguration;
import androidx.navigation.ui.NavigationUI;
import androidx.drawerlayout.widget.DrawerLayout;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
public class HomeActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
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.addDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView =findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
}
@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 onNavigationItemSelected (MenuItem item) {
//Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_find_people) {
startActivity(new Intent(HomeActivity.this, AllPeopleActivity.class));
}else if (id == R.id.nav_add_people) {
}else if (id == R.id.nav_sign_out) {
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
@Override
public void onPointerCaptureChanged(boolean hasCapture) {
}
}<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="android.support.design.widget.AppBarLayout$ScrollingVie..."
tools:context=".HomeActivity"
tools:showIn="@layout/app_bar_home">
</androidx.constraintlayout.widget.ConstraintLayout>Here is the rules for my realtime database.
{
"rules": {
".read": "true",
".write": "true",
}
}This is the error in logcat and Stracktrace when I use above rules for the realtime database.
package com.example.realtimelocationtracking10;
import android.app.Notification;
import android.content.Intent;
import android.graphics.drawable.Icon;
import android.os.Bundle;
import android.view.Gravity;
import android.view.MenuItem;
import android.view.View;
import android.view.Menu;
import com.google.android.material.floatingactionbutton.FloatingActionButton;
import com.google.android.material.snackbar.Snackbar;
import com.google.android.material.navigation.NavigationView;
import androidx.appcompat.app.ActionBarDrawerToggle;
import androidx.core.view.GravityCompat;
import androidx.navigation.NavController;
import androidx.navigation.Navigation;
import androidx.navigation.ui.AppBarConfiguration;
import androidx.navigation.ui.NavigationUI;
import androidx.drawerlayout.widget.DrawerLayout;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
public class HomeActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
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.addDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView =findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
}
@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 onNavigationItemSelected (MenuItem item) {
//Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_find_people) {
startActivity(new Intent(HomeActivity.this, AllPeopleActivity.class));
}else if (id == R.id.nav_add_people) {
}else if (id == R.id.nav_sign_out) {
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
@Override
public void onPointerCaptureChanged(boolean hasCapture) {
}
}Hope can have people can help me to solve it. Thank you very much.
