在Android中使用firebase登录_Android_Firebase_Firebase Realtime Database

在Android中使用firebase登录

android firebase

在Android中使用firebase登录,android,firebase,firebase-realtime-database,Android,Firebase,Firebase Realtime Database,在你的应用中创建两个用于登录和注册的活动，并继续尝试。确保你的应用已启用firebase连接。谢谢，这里是登录活动的代码 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_login); register = (TextView)findViewById(R.

在你的应用中创建两个用于登录和注册的活动，并继续尝试。确保你的应用已启用firebase连接。谢谢，这里是登录活动的代码

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_login);

    register = (TextView)findViewById(R.id.register);
    username = (EditText)findViewById(R.id.username);
    password = (EditText)findViewById(R.id.password);
    loginButton = (Button)findViewById(R.id.loginButton);

    register.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            startActivity(new Intent(Login.this, Register.class));
        }
    });

    loginButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            user = username.getText().toString();
            pass = password.getText().toString();

            if(user.equals("")){
                username.setError("can't be blank");
            }
            else if(pass.equals("")){
                password.setError("can't be blank");
            }
            else{
                String url = "https://fireapp-ae761.firebaseio.com/users.json";
                final ProgressDialog pd = new ProgressDialog(Login.this);
                pd.setMessage("Loading...");
                pd.show();

                StringRequest request = new StringRequest(Request.Method.GET, url, new Response.Listener<String>(){
                    @Override
                    public void onResponse(String s) {
                        if(s.equals("null")){
                            Toast.makeText(Login.this, "user not found", Toast.LENGTH_LONG).show();
                        }
                        else{
                            try {
                                JSONObject obj = new JSONObject(s);

                                if(!obj.has(user)){
                                    Toast.makeText(Login.this, "user not found", Toast.LENGTH_LONG).show();
                                }
                                else if(obj.getJSONObject(user).getString("password").equals(pass)){
                                    UserDetails.username = user;
                                    UserDetails.password = pass;
                                    startActivity(new Intent(Login.this,FirebaseNewActivity.class));
                                }
                                else {
                                    Toast.makeText(Login.this, "incorrect password", Toast.LENGTH_LONG).show();
                                }
                            } catch (JSONException e) {
                                e.printStackTrace();
                            }
                        }

                        pd.dismiss();
                    }
                },new Response.ErrorListener(){
                    @Override
                    public void onErrorResponse(VolleyError volleyError) {
                        System.out.println("" + volleyError);
                        pd.dismiss();
                    }
                });

                RequestQueue rQueue = Volley.newRequestQueue(Login.this);
                rQueue.add(request);
            }

        }
    });
}

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_register);

    username = (EditText)findViewById(R.id.username);
    password = (EditText)findViewById(R.id.password);
    registerButton = (Button)findViewById(R.id.registerButton);
    login = (TextView)findViewById(R.id.login);

    Firebase.setAndroidContext(this);

    login.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            startActivity(new Intent(Register.this, Login.class));
        }
    });

    registerButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            user = username.getText().toString();
            pass = password.getText().toString();

            if(user.equals("")){
                username.setError("can't be blank");
            }
            else if(pass.equals("")){
                password.setError("can't be blank");
            }
            else if(!user.matches("[A-Za-z0-9]+")){
                username.setError("only alphabet or number allowed");
            }
            else if(user.length()<5){
                username.setError("at least 5 characters long");
            }
            else if(pass.length()<5){
                password.setError("at least 5 characters long");
            }
            else {
                final ProgressDialog pd = new ProgressDialog(Register.this);
                pd.setMessage("Loading...");
                pd.show();

                String url = "https://fireapp-ae761.firebaseio.com/users.json";

                StringRequest request = new StringRequest(Request.Method.GET, url, new Response.Listener<String>(){
                    @Override
                    public void onResponse(String s) {
                        Firebase reference = new Firebase("https://fireapp-ae761.firebaseio.com/users");

                        if(s.equals("null")) {
                            reference.child(user).child("password").setValue(pass);
                            Toast.makeText(Register.this, "registration successful", Toast.LENGTH_LONG).show();
                        }
                        else {
                            try {
                                JSONObject obj = new JSONObject(s);

                                if (!obj.has(user)) {
                                    reference.child(user).child("password").setValue(pass);
                                    Toast.makeText(Register.this, "registration successful", Toast.LENGTH_LONG).show();
                                } else {
                                    Toast.makeText(Register.this, "username already exists", Toast.LENGTH_LONG).show();
                                }

                            } catch (JSONException e) {
                                e.printStackTrace();
                            }
                        }

                        pd.dismiss();
                    }

                },new Response.ErrorListener(){
                    @Override
                    public void onErrorResponse(VolleyError volleyError) {
                        System.out.println("" + volleyError );
                        pd.dismiss();
                    }
                });

                RequestQueue rQueue = Volley.newRequestQueue(Register.this);
                rQueue.add(request);
            }
        }
    });
}

@覆盖
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity\u登录）；
寄存器=（TextView）findViewById（R.id.register）；
用户名=（EditText）findViewById（R.id.username）；
密码=（EditText）findViewById（R.id.password）；
loginButton=（按钮）findViewById（R.id.loginButton）；
register.setOnClickListener（新视图.OnClickListener（）{
@凌驾
公共void onClick（视图v）{
startActivity（新意图（Login.this、Register.class））；
}
});
loginButton.setOnClickListener（新视图.OnClickListener（）{
@凌驾
公共void onClick（视图v）{
user=username.getText（）.toString（）；
pass=password.getText（）.toString（）；
if（user.equals（“”）{
username.setError（“不能为空”）；
}
else if（pass.equals（“”）{
password.setError（“不能为空”）；
}
否则{
字符串url=”https://fireapp-ae761.firebaseio.com/users.json";
final ProgressDialog pd=新建ProgressDialog（Login.this）；
pd.setMessage（“加载…”）；
pd.show（）；
StringRequest=newStringRequest（request.Method.GET，url，new Response.Listener（））{
@凌驾
公共void onResponse（字符串s）{
如果（s.equals（“null”））{
Toast.makeText（Login.this，“未找到用户”，Toast.LENGTH_LONG.show（）；
}
否则{
试一试{
JSONObject obj=新的JSONObject；
如果（！obj.has（用户））{
Toast.makeText（Login.this，“未找到用户”，Toast.LENGTH_LONG.show（）；
}
else if（obj.getJSONObject（user.getString（“密码”）.equals（pass））{
UserDetails.username=用户；
UserDetails.password=pass；
startActivity（新意图（Login.this，FirebaseNewActivity.class））；
}
否则{
Toast.makeText（Login.this，“密码不正确”，Toast.LENGTH_LONG.show（）；
}
}捕获（JSONException e）{
e、 printStackTrace（）；
}
}
pd.解散（）；
}
}，new Response.ErrorListener（）{
@凌驾
公共错误响应（截击错误截击错误）{
System.out.println（““+截击错误”）；
pd.解散（）；
}
});
RequestQueue rQueue=Volley.newRequestQueue（Login.this）；
rQueue.add（请求）；
}
}
});
}

}

在这里注册活动，你们必须在你们的版面中为你们的每个活动添加编辑文本和按钮

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_login);

    register = (TextView)findViewById(R.id.register);
    username = (EditText)findViewById(R.id.username);
    password = (EditText)findViewById(R.id.password);
    loginButton = (Button)findViewById(R.id.loginButton);

    register.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            startActivity(new Intent(Login.this, Register.class));
        }
    });

    loginButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            user = username.getText().toString();
            pass = password.getText().toString();

            if(user.equals("")){
                username.setError("can't be blank");
            }
            else if(pass.equals("")){
                password.setError("can't be blank");
            }
            else{
                String url = "https://fireapp-ae761.firebaseio.com/users.json";
                final ProgressDialog pd = new ProgressDialog(Login.this);
                pd.setMessage("Loading...");
                pd.show();

                StringRequest request = new StringRequest(Request.Method.GET, url, new Response.Listener<String>(){
                    @Override
                    public void onResponse(String s) {
                        if(s.equals("null")){
                            Toast.makeText(Login.this, "user not found", Toast.LENGTH_LONG).show();
                        }
                        else{
                            try {
                                JSONObject obj = new JSONObject(s);

                                if(!obj.has(user)){
                                    Toast.makeText(Login.this, "user not found", Toast.LENGTH_LONG).show();
                                }
                                else if(obj.getJSONObject(user).getString("password").equals(pass)){
                                    UserDetails.username = user;
                                    UserDetails.password = pass;
                                    startActivity(new Intent(Login.this,FirebaseNewActivity.class));
                                }
                                else {
                                    Toast.makeText(Login.this, "incorrect password", Toast.LENGTH_LONG).show();
                                }
                            } catch (JSONException e) {
                                e.printStackTrace();
                            }
                        }

                        pd.dismiss();
                    }
                },new Response.ErrorListener(){
                    @Override
                    public void onErrorResponse(VolleyError volleyError) {
                        System.out.println("" + volleyError);
                        pd.dismiss();
                    }
                });

                RequestQueue rQueue = Volley.newRequestQueue(Login.this);
                rQueue.add(request);
            }

        }
    });
}

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_register);

    username = (EditText)findViewById(R.id.username);
    password = (EditText)findViewById(R.id.password);
    registerButton = (Button)findViewById(R.id.registerButton);
    login = (TextView)findViewById(R.id.login);

    Firebase.setAndroidContext(this);

    login.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            startActivity(new Intent(Register.this, Login.class));
        }
    });

    registerButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            user = username.getText().toString();
            pass = password.getText().toString();

            if(user.equals("")){
                username.setError("can't be blank");
            }
            else if(pass.equals("")){
                password.setError("can't be blank");
            }
            else if(!user.matches("[A-Za-z0-9]+")){
                username.setError("only alphabet or number allowed");
            }
            else if(user.length()<5){
                username.setError("at least 5 characters long");
            }
            else if(pass.length()<5){
                password.setError("at least 5 characters long");
            }
            else {
                final ProgressDialog pd = new ProgressDialog(Register.this);
                pd.setMessage("Loading...");
                pd.show();

                String url = "https://fireapp-ae761.firebaseio.com/users.json";

                StringRequest request = new StringRequest(Request.Method.GET, url, new Response.Listener<String>(){
                    @Override
                    public void onResponse(String s) {
                        Firebase reference = new Firebase("https://fireapp-ae761.firebaseio.com/users");

                        if(s.equals("null")) {
                            reference.child(user).child("password").setValue(pass);
                            Toast.makeText(Register.this, "registration successful", Toast.LENGTH_LONG).show();
                        }
                        else {
                            try {
                                JSONObject obj = new JSONObject(s);

                                if (!obj.has(user)) {
                                    reference.child(user).child("password").setValue(pass);
                                    Toast.makeText(Register.this, "registration successful", Toast.LENGTH_LONG).show();
                                } else {
                                    Toast.makeText(Register.this, "username already exists", Toast.LENGTH_LONG).show();
                                }

                            } catch (JSONException e) {
                                e.printStackTrace();
                            }
                        }

                        pd.dismiss();
                    }

                },new Response.ErrorListener(){
                    @Override
                    public void onErrorResponse(VolleyError volleyError) {
                        System.out.println("" + volleyError );
                        pd.dismiss();
                    }
                });

                RequestQueue rQueue = Volley.newRequestQueue(Register.this);
                rQueue.add(request);
            }
        }
    });
}

@覆盖
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity\u寄存器）；
用户名=（EditText）findViewById（R.id.username）；
密码=（EditText）findViewById（R.id.password）；
registerButton=（按钮）findViewById（R.id.registerButton）；
login=（TextView）findViewById（R.id.login）；
Firebase.setAndroidContext（this）；
login.setOnClickListener（新视图.OnClickListener（）{
@凌驾
公共void onClick（视图v）{
startActivity（新意图（Register.this、Login.class））；
}
});
registerButton.setOnClickListener（新视图.OnClickListener（）{
@凌驾
公共void onClick（视图v）{
user=username.getText（）.toString（）；
pass=password.getText（）.toString（）；
if（user.equals（“”）{
username.setError（“不能为空”）；
}
else if（pass.equals（“”）{
password.setError（“不能为空”）；
}
如果（！user.matches（“[A-Za-z0-9]+”），则为else{
username.setError（“仅允许字母或数字”）；
}
else if（user.length（）