之前有寫過一篇用sharepreference做的帳號密碼登入程式,其實本來就不應該用sharepreference做登入例子的,所以這次就來寫一個用FireBase第三方平台做的帳號密碼登入程式+資料庫的使用範例。
FireBase被Google收購後,推出了網路管理介面和新的SDK類別庫,並推出許多新功能,FireBase提供了API讓開發人員儲存或同步不同平台的資料,開發人員不需要自己建構資料庫與設計伺服器端的程式,也就是說不用寫一堆PHP了,真的相當方便!
前置步驟:
步驟一:更新SDK工具,必須將Google play services更新到版本30以上和Google Repository更新到版本26以上。
步驟二:建好FireBase,詳細如何建立firebase就不在這裡說明,如下圖
在FireBase建立好App要用的專案
這是到Authentication開啟用Email登入的設定畫面,可以認證的方式有Email、FaceBook、Twitter等
這是FireBase資料庫的畫面
步驟三:在Android studio裡的專案導入好FireBase
導入完成後可以看到已經幫你加入到了Gradle裡了
導入好FireBase到Android Studio裡後回去FireBase網業管理介面裡可以看到已經幫你跟專案 連結好了,以上都確定已經設定好後就可以開始寫程式碼了。
情境描述:
1. MainActivty:帳號密碼登入頁面,如果已經登入過了,下次就會自動登入,除非登出了。
2. Register:註冊的頁面
3 .ShowData:用Listview顯示資料庫資料,和登出功能
程式碼:
MainActivity.xml :
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
tools:context="com.example.user.firebasetest.MainActivity"
android:orientation="vertical"
android:gravity="center">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="帳號:"/>
<EditText
android:layout_width="250dp"
android:layout_height="wrap_content"
android:hint="請輸入帳號"
android:id="@+id/edtemail"/>
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="密碼:"/>
<EditText
android:layout_width="250dp"
android:layout_height="wrap_content"
android:hint="請輸入密碼"
android:id="@+id/edtpassword"/>
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="登入"
android:id="@+id/btnlogin"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="註冊"
android:id="@+id/btnregister"/>
</LinearLayout>
</LinearLayout>
MainActivity.java:
import android.content.Intent;
import android.nfc.Tag;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
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;
public class MainActivity extends AppCompatActivity {
private Button btnlogin,btnregister;
private EditText edtemail,edtpassword;
private FirebaseAuth mAuth;
private FirebaseAuth.AuthStateListener mAuthListener;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
findviewById();
mAuth = FirebaseAuth.getInstance();
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",user.getUid());
startActivity(new Intent(MainActivity.this,ShowData.class));
} else {
// User is signed out
Log.d("Tag","user ==null");
}
// ...
}
};
}
private View.OnClickListener btnListener = new View.OnClickListener(){
@Override
public void onClick(View view) {
if (view.getId()==R.id.btnlogin){
String email = edtemail.getText().toString();
String password = edtpassword.getText().toString();
mAuth.signInWithEmailAndPassword(email,password)
.addOnCompleteListener(new OnCompleteListener() {
@Override
public void onComplete(@NonNull Task task) {
if (task.isSuccessful()){
Log.d("TAG","登入成功");
}
}
});
}
if (view.getId()==R.id.btnregister){
startActivity(new Intent(MainActivity.this,Register.class));
}
}
};
private void findviewById() {
btnlogin = (Button)findViewById(R.id.btnlogin);
btnregister = (Button)findViewById(R.id.btnregister);
edtemail = (EditText)findViewById(R.id.edtemail);
edtpassword = (EditText)findViewById(R.id.edtpassword);
btnlogin.setOnClickListener(btnListener);
btnregister.setOnClickListener(btnListener);
}
public void onStart() {
super.onStart();
mAuth.addAuthStateListener(mAuthListener);
}
public void onStop() {
super.onStop();
if (mAuthListener != null) {
mAuth.removeAuthStateListener(mAuthListener);
}
}
}
Register.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
tools:context="com.example.user.firebasetest.Register"
android:orientation="vertical"
android:gravity="center">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="帳號:"/>
<EditText
android:layout_width="250dp"
android:layout_height="wrap_content"
android:hint="請輸入帳號"
android:id="@+id/edtemail"/>
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="密碼:"/>
<EditText
android:layout_width="250dp"
android:layout_height="wrap_content"
android:hint="請輸入密碼"
android:id="@+id/edtpassword"/>
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="註冊"
android:id="@+id/btnregister"/>
</LinearLayout>
</LinearLayout>
Register.java:
import android.content.DialogInterface;
import android.support.annotation.NonNull;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
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;
public class Register extends AppCompatActivity {
private Button btnregister;
private EditText edtemail,edtpassword;
private FirebaseAuth mAuth;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_register);
mAuth = FirebaseAuth.getInstance();
setTitle("註冊");
findviewById();
}
private void findviewById() {
edtemail = (EditText)findViewById(R.id.edtemail);
edtpassword = (EditText)findViewById(R.id.edtpassword);
btnregister = (Button)findViewById(R.id.btnregister);
btnregister.setOnClickListener(registerListener);
}
private View.OnClickListener registerListener = new View.OnClickListener() {
@Override
public void onClick(View v) {
if (v.getId()==R.id.btnregister){
String email = edtemail.getText().toString();
String password = edtpassword.getText().toString();
mAuth.createUserWithEmailAndPassword(email, password)
.addOnCompleteListener(new OnCompleteListener() {
@Override
public void onComplete(@NonNull Task task) {
if (task.isSuccessful()){
new AlertDialog.Builder(Register.this)
.setMessage("註冊成功")
.setPositiveButton("確定", new DialogInterface.OnClickListener(){
@Override
public void onClick(DialogInterface dialog, int which) {
finish();
}
})
.show();
}
else {
new AlertDialog.Builder(Register.this)
.setMessage("註冊失敗")
.setPositiveButton("確定",null)
.show();
}
}
});
}
}
};
}
ShowData.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
tools:context="com.example.user.firebasetest.ShowData"
android:orientation="vertical">
<ListView
android:layout_width="wrap_content"
android:layout_height="450dp"
android:id="@+id/listview">
</ListView>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="登出"
android:id="@+id/btnlogout"
android:layout_gravity="center"/>
</LinearLayout>
ShowData.java:
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import com.google.firebase.auth.FirebaseAuth;
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 java.util.ArrayList;
import java.util.List;
public class ShowData extends AppCompatActivity {
private Button btnlogout;
private ListView listview;
ArrayAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_show_data);
setTitle("ShowData");
btnlogout = (Button)findViewById(R.id.btnlogout);
listview = (ListView)findViewById(R.id.listview);
adapter = new ArrayAdapter(this,android.R.layout.simple_list_item_1);
btnlogout.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
FirebaseAuth.getInstance().signOut();
finish();
}
});
getData();
}
private void getData() {
final FirebaseDatabase database = FirebaseDatabase.getInstance();
DatabaseReference myRef = database.getReference("員工");
myRef.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
adapter.clear();
for (DataSnapshot contact : dataSnapshot.getChildren()){
adapter.add(contact.getKey().toString()+"-"+contact.child("phone").getValue().toString());
}
listview.setAdapter(adapter);
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
}
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