Esempio di autenticazione basata su email/password su Firebase usando un client Android (ripreso dal
GitHub ufficiale)
Per prima cosa dalla Consolle di Firebase si deve abilitare l'autenticazione mail/password
e si aggiunge un utente
build.gradle (progetto)
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buildscript {
repositories {
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:2.2.3' classpath 'com.google.gms:google-services:3.0.0'
// NOTE: Do not place your application dependencies here; they belong // in the individual module build.gradle files }
}
allprojects {
repositories {
jcenter()
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}
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build.gradle (app)
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apply plugin: 'com.android.application'
android {
compileSdkVersion 25 buildToolsVersion "23.0.1" defaultConfig {
applicationId "com.luca_innocenti.dbfirebase" minSdkVersion 19 targetSdkVersion 25 versionCode 1 versionName "1.0" testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" }
buildTypes {
release {
minifyEnabled false proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' }
}
}
dependencies {
compile 'com.google.firebase:firebase-core:10.0.0'
compile 'com.google.firebase:firebase-auth:10.0.0'
compile fileTree(dir: 'libs', include: ['*.jar'])
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations' })
compile 'com.android.support:appcompat-v7:25.1.0' compile 'com.android.support:design:25.1.0' testCompile 'junit:junit:4.12'}
apply plugin: 'com.google.gms.google-services'
--------------
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package com.luca_innocenti.dbfirebase;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.AuthResult;
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 org.w3c.dom.Text;
import java.util.HashMap;import java.util.Map;
public class MainActivity extends AppCompatActivity {
TextView mConditionTextView;
Button mButton;
Button mLogin;
Button mInsert;
DatabaseReference mRootRef = FirebaseDatabase.getInstance().getReference();
DatabaseReference mConditionRef = mRootRef.child("condition");
private FirebaseAuth mAuth;
private FirebaseAuth.AuthStateListener mAuthListener;
private static final String TAG = "EmailPassword";
@Override protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mConditionTextView = (TextView) findViewById(R.id.textView2);
mButton = (Button) findViewById(R.id.button2);
mInsert = (Button) findViewById(R.id.button5);
mLogin = (Button) findViewById(R.id.button4);
// [START initialize_auth]
// Controlla se all'avvio l'utente e' gia' autenticato
mAuth = FirebaseAuth.getInstance();
// [END initialize_auth]
// [START auth_state_listener]
mAuthListener = new FirebaseAuth.AuthStateListener() {
@Override public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
FirebaseUser user = firebaseAuth.getCurrentUser();
if (user != null) {
// User is signed in Log.d(TAG, "onAuthStateChanged:signed_in:" + user.getUid());
} else {
// User is signed out Log.d(TAG, "onAuthStateChanged:signed_out");
}
// [START_EXCLUDE] // [END_EXCLUDE] }
};
// [END auth_state_listener]
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) 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();
}
});
}
@Override protected void onStart()
{
super.onStart();
mAuth.addAuthStateListener(mAuthListener);
mConditionRef.addValueEventListener(new ValueEventListener() {
@Override public void onDataChange(DataSnapshot dataSnapshot) {
String text = dataSnapshot.getValue(String.class);
mConditionTextView.setText(text);
}
@Override public void onCancelled(DatabaseError databaseError) {
}
});
mButton.setOnClickListener(new View.OnClickListener(){
@Override public void onClick(View view) {
mConditionRef.setValue("Update");
}
});
mInsert.setOnClickListener(new View.OnClickListener(){
private DatabaseReference usersRef;
public void onClick(View view) {
usersRef = mRootRef.child("condition");
Map<String,Object> nick = new HashMap<String, Object>();
nick.put("nome","Luca");
usersRef.setValue(nick);
Log.d(TAG,"inserimento");
}
});
//se si clicca il pulsante viene richiamata la procedura di autenticazione
// per semplicita' username e password sono statici
mLogin.setOnClickListener(new View.OnClickListener(){
@Override public void onClick(View view) {
signIn("lucainnoc@gmail.com","xxxxxxxx");
}
});
}
@Override public void onStop() {
super.onStop();
if (mAuthListener != null) {
mAuth.removeAuthStateListener(mAuthListener);
}
}
//Funzione di autenticazione
private void signIn(String email, String password) {
Log.d(TAG, "signIn:" + email);
// [START sign_in_with_email] mAuth.signInWithEmailAndPassword(email, password)
.addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
@Override public void onComplete(@NonNull Task<AuthResult> task) {
Log.d(TAG, "signInWithEmail:onComplete:" + task.isSuccessful());
// If sign in fails, display a message to the user. If sign in succeeds
// the auth state listener will be notified and logic to handle the
// signed in user can be handled in the listener.
if (!task.isSuccessful()) {
Log.d(TAG, "signInWithEmail:failed", task.getException());
Toast.makeText(getApplicationContext(), "Fallito",Toast.LENGTH_SHORT).show();
}
// [START_EXCLUDE] if (!task.isSuccessful()) {
Log.d(TAG, "signInWithEmail:successo");
Toast.makeText(getApplicationContext(), "Riuscito",Toast.LENGTH_SHORT).show();
}
// [END_EXCLUDE] }
});
// [END sign_in_with_email] }
@Override public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId();
//noinspection SimplifiableIfStatement if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
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