在本教程中，我们将使用Volley库和JSON创建基本的用户注册和登录模块。 Volley是一个HTTP库，为我们的应用程序提供了网络连接功能。
使用Volley库的优点如下：
- 更轻松，更快的请求管理。
- 提供有效的网络管理。
在创建Android应用程序模块之前，让我们首先创建服务器端数据处理API代码，以在PHP和MySQL中进行注册和登录。
1.创建一个名称为registerlogin和表users的数据库，其中包含以下字段。
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2.在C：\ xampp \ htdocs \ androidphpmysql目录下，使用PHP和数据库编写以下连接建立代码。
在androidphpmysql（你的项目位置）目录中，创建一个connection.php文件并编写以下代码。
connection.php
<
?php
$servername = "localhost";
$username = "root";
$password = "";
$database = "registerlogin";
$conn = new mysqli($servername, $username, $password, $database);
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
?>3.在androidphpmysql目录中创建一个registrationapi.php文件，并编写以下代码。该文件处理来自Android应用程序的请求，并以JSON数组的形式生成对Android应用程序的响应。
registrationapi.php
<
?php
require_once 'connection.php';
$response = array();
if(isset($_GET['apicall'])){
switch($_GET['apicall']){
case 'signup':
if(isTheseParametersAvailable(array('username', 'email', 'password', 'gender'))){
$username = $_POST['username'];
$email = $_POST['email'];
$password = md5($_POST['password']);
$gender = $_POST['gender'];
$stmt = $conn->prepare("SELECT id FROM users WHERE username = ? OR email = ?");
$stmt->bind_param("ss", $username, $email);
$stmt->execute();
$stmt->store_result();
if($stmt->num_rows > 0){
$response['error'] = true;
$response['message'] = 'User already registered';
$stmt->close();
}
else{
$stmt = $conn->prepare("INSERT INTO users (username, email, password, gender) VALUES (?, ?, ?, ?)");
$stmt->bind_param("ssss", $username, $email, $password, $gender);
if($stmt->execute()){
$stmt = $conn->prepare("SELECT id, id, username, email, gender FROM users WHERE username = ?");
$stmt->bind_param("s", $username);
$stmt->execute();
$stmt->bind_result($userid, $id, $username, $email, $gender);
$stmt->fetch();
$user = array(
'id'=>$id, 'username'=>$username, 'email'=>$email, 'gender'=>$gender
);
$stmt->close();
$response['error'] = false;
$response['message'] = 'User registered successfully';
$response['user'] = $user;
}
}
}
else{
$response['error'] = true;
$response['message'] = 'required parameters are not available';
}
break;
case 'login':
if(isTheseParametersAvailable(array('username', 'password'))){
$username = $_POST['username'];
$password = md5($_POST['password']);
$stmt = $conn->prepare("SELECT id, username, email, gender FROM users WHERE username = ? AND password = ?");
$stmt->bind_param("ss", $username, $password);
$stmt->execute();
$stmt->store_result();
if($stmt->num_rows > 0){
$stmt->bind_result($id, $username, $email, $gender);
$stmt->fetch();
$user = array(
'id'=>$id, 'username'=>$username, 'email'=>$email, 'gender'=>$gender
);
$response['error'] = false;
$response['message'] = 'Login successfull';
$response['user'] = $user;
}
else{
$response['error'] = false;
$response['message'] = 'Invalid username or password';
}
}
break;
default:
$response['error'] = true;
$response['message'] = 'Invalid Operation Called';
}
}
else{
$response['error'] = true;
$response['message'] = 'Invalid API Call';
}
echo json_encode($response);
function isTheseParametersAvailable($params){
foreach($params as $param){
if(!isset($_POST[$param])){
return false;
}
}
return true;
}
?>要检查你的PHP API是否正常运行，可以使用REST客户端（例如Postman工具）。
要检查API的注册代码，可以通过参数传递注册URL。
文章图片
同样，你可以通过传递带有有效参数的登录URL来检查登录操作。
文章图片
现在，在Android应用程序中，我们将创建三个活动类以进行用户注册，用户登录并在主要活动中显示用户详细信息（作为配置文件）。
在布局中创建一个activity_main.xml并添加以下代码。此活动用于将用户的详细信息显示为配置文件。
activity_main.xml
<
?xml version="1.0" encoding="utf-8"?>
<
android.support.constraint.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"
tools:context="example.srcmini.com.volleyregistrationloginsystem.MainActivity"><
LinearLayout
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:orientation="vertical"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.0"><
TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="Welcome to Profile"
android:textAppearance="@style/Base.TextAppearance.AppCompat.Large" /><
TableLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="50dp"><
TableRow><
TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="10dp"
android:text="Id"
android:textAppearance="@style/Base.TextAppearance.AppCompat.Large" /><
TextView
android:id="@+id/textViewId"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="10dp"
android:text="id"
android:textAppearance="@style/Base.TextAppearance.AppCompat.Medium" /><
/TableRow><
TableRow><
TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="10dp"
android:text="Username"
android:textAppearance="@style/Base.TextAppearance.AppCompat.Large" /><
TextView
android:id="@+id/textViewUsername"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="10dp"
android:text="username"
android:textAppearance="@style/Base.TextAppearance.AppCompat.Medium" /><
/TableRow><
TableRow><
TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="10dp"
android:text="Email"
android:textAppearance="@style/Base.TextAppearance.AppCompat.Large" /><
TextView
android:id="@+id/textViewEmail"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="10dp"
android:text="useremail"
android:textAppearance="@style/Base.TextAppearance.AppCompat.Medium" /><
/TableRow><
TableRow><
TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="10dp"
android:text="Gender"
android:textAppearance="@style/Base.TextAppearance.AppCompat.Large" /><
TextView
android:id="@+id/textViewGender"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="10dp"
android:text="gender"
android:textAppearance="@style/Base.TextAppearance.AppCompat.Medium" /><
/TableRow><
/TableLayout><
Button
android:id="@+id/buttonLogout"
android:layout_width="210dp"
android:layout_height="50dp"
android:layout_marginTop="150dp"
android:layout_marginLeft="75dp"
android:text="Logout" />
<
/LinearLayout><
/android.support.constraint.ConstraintLayout>现在，使用以下代码在布局目录中创建一个activity_login.xml文件。此活动用于用户登录UI。
activity_login.xml
<
?xml version="1.0" encoding="utf-8"?>
<
android.support.constraint.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"
tools:context="example.srcmini.com.volleyregistrationloginsystem.LoginActivity"><
TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="16dp"
android:gravity="center"
android:text="Login"
android:textAppearance="@style/Base.TextAppearance.AppCompat.Large"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="1.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" /><
EditText
android:id="@+id/etUserName"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:ems="10"
android:inputType="textPersonName"
android:hint="user name"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.144" /><
EditText
android:id="@+id/etUserPassword"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:hint="password"
android:ems="10"
android:inputType="textPassword"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/etUserName" /><
Button
android:id="@+id/btnLogin"
android:layout_width="210dp"
android:layout_height="50dp"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:text="Login"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/etUserName"
app:layout_constraintVertical_bias="0.754" /><
TextView
android:id="@+id/tvRegister"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:gravity="center"
android:text="Create New Account\n Register Here"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/btnLogin"
app:layout_constraintVertical_bias="0.405" /><
ProgressBar
android:id="@+id/progressBar"
android:visibility="gone"
style="?android:attr/progressBarStyle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.456" /><
/android.support.constraint.ConstraintLayout>使用以下代码在布局目录中创建一个activity_register.xml文件。此活动用于用户注册UI。
activity_register.xml
<
?xml version="1.0" encoding="utf-8"?>
<
android.support.constraint.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"
tools:context="example.srcmini.com.volleyregistrationloginsystem.RegisterActivity"><
LinearLayout
android:layout_width="match_parent"
android:layout_height="519dp"
android:layout_centerVertical="true"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:orientation="vertical"
android:padding="10dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.0"><
TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Register"
android:gravity="center"
android:textAppearance="@style/Base.TextAppearance.AppCompat.Large" /><
EditText
android:id="@+id/editTextUsername"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginTop="20dp"
android:hint="Username"
android:inputType="text" /><
EditText
android:id="@+id/editTextEmail"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginTop="8dp"
android:hint="Email"
android:inputType="textEmailAddress" /><
EditText
android:id="@+id/editTextPassword"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginTop="8dp"
android:fontFamily="sans-serif"
android:hint="Password"
android:inputType="textPassword" /><
RadioGroup
android:id="@+id/radioGender"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginTop="8dp"
android:orientation="horizontal"><
RadioButton
android:id="@+id/radioButtonMale"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:checked="true"
android:text="Male" /><
RadioButton
android:id="@+id/radioButtonFemale"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Female" /><
/RadioGroup><
Button
android:id="@+id/buttonRegister"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginTop="90dp"
android:text="Register" /><
TextView
android:id="@+id/textViewLogin"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginTop="8dp"
android:text="Already Registered?\nLogin Here"
android:textAlignment="center"
android:textAppearance="@style/Base.TextAppearance.AppCompat.Medium" />
<
/LinearLayout><
ProgressBar
android:visibility="gone"
android:id="@+id/progressBar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true" /><
/android.support.constraint.ConstraintLayout>在build.gradle文件中添加volley库依赖项。
build.gradle
implementation 'com.android.volley:volley:1.0.0'使用以下代码创建一个名为User.java的数据模型类。
User.java
package example.srcmini.com.volleyregistrationloginsystem;
public class User {
private int id;
private String name, email, gender;
public User(int id, String name, String email, String gender) {
this.id = id;
this.email = email;
this.gender = gender;
this.name = name;
}public int getId() {
return id;
}public void setId(int id) {
this.id = id;
}public String getName() {
return name;
}public void setName(String name) {
this.name = name;
}public String getEmail() {
return email;
}public void setEmail(String email) {
this.email = email;
}public String getGender() {
return gender;
}public void setGender(String gender) {
this.gender = gender;
}
}我们需要定义调用服务器端API的URL。
创建一个URLs.java类并定义URL。
URLs.java
package example.srcmini.com.volleyregistrationloginsystem;
public class URLs {
private static final String ROOT_URL = "http://192.168.1.35/androidphpmysql/registrationapi.php?apicall=";
public static final String URL_REGISTER = ROOT_URL + "signup";
public static final String URL_LOGIN= ROOT_URL + "login";
}VolleySingleton.java
package example.srcmini.com.volleyregistrationloginsystem;
import android.content.Context;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.toolbox.Volley;
public class VolleySingleton {
private static VolleySingleton mInstance;
private RequestQueue mRequestQueue;
private static Context mCtx;
private VolleySingleton(Context context) {
mCtx = context;
mRequestQueue = getRequestQueue();
}public static synchronized VolleySingleton getInstance(Context context) {
if (mInstance == null) {
mInstance = new VolleySingleton(context);
}
return mInstance;
}public RequestQueue getRequestQueue() {
if (mRequestQueue == null) {
// getApplicationContext() is key, it keeps you from leaking the
// Activity or BroadcastReceiver if someone passes one in.
mRequestQueue = Volley.newRequestQueue(mCtx.getApplicationContext());
}
return mRequestQueue;
}public <
T> void addToRequestQueue(Request<
T> req) {
getRequestQueue().add(req);
}
}创建一个名为SharedPreferences.java的类。在此类中，我们使用SharedPreferences类存储用户详细信息。 SharedPreferences类包含具有以下功能的四个方法：
- userLogin（）：此方法用于在登录后将用户信息存储在SharedPreferences中。
- isLoggedIn（）：此方法检查用户是否已经登录。
- getUser（）：此方法在登录时获取用户信息。
- logout（）：此方法清除SharedPreferences数据并注销用户。
package example.srcmini.com.volleyregistrationloginsystem;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
public class SharedPrefManager {private static final String SHARED_PREF_NAME = "volleyregisterlogin";
private static final String KEY_USERNAME = "keyusername";
private static final String KEY_EMAIL = "keyemail";
private static final String KEY_GENDER = "keygender";
private static final String KEY_ID = "keyid";
private static SharedPrefManager mInstance;
private static Context ctx;
private SharedPrefManager(Context context) {
ctx = context;
}
public static synchronized SharedPrefManager getInstance(Context context) {
if (mInstance == null) {
mInstance = new SharedPrefManager(context);
}
return mInstance;
}//this method will store the user data in shared preferences
public void userLogin(User user) {
SharedPreferences sharedPreferences = ctx.getSharedPreferences(SHARED_PREF_NAME, Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putInt(KEY_ID, user.getId());
editor.putString(KEY_USERNAME, user.getName());
editor.putString(KEY_EMAIL, user.getEmail());
editor.putString(KEY_GENDER, user.getGender());
editor.apply();
}//this method will checker whether user is already logged in or not
public boolean isLoggedIn() {
SharedPreferences sharedPreferences = ctx.getSharedPreferences(SHARED_PREF_NAME, Context.MODE_PRIVATE);
return sharedPreferences.getString(KEY_USERNAME, null) != null;
}//this method will give the logged in user
public User getUser() {
SharedPreferences sharedPreferences = ctx.getSharedPreferences(SHARED_PREF_NAME, Context.MODE_PRIVATE);
return new User(
sharedPreferences.getInt(KEY_ID, -1), sharedPreferences.getString(KEY_USERNAME, null), sharedPreferences.getString(KEY_EMAIL, null), sharedPreferences.getString(KEY_GENDER, null)
);
}//this method will logout the user
public void logout() {
SharedPreferences sharedPreferences = ctx.getSharedPreferences(SHARED_PREF_NAME, Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.clear();
editor.apply();
ctx.startActivity(new Intent(ctx, LoginActivity.class));
}
}现在，在MainActivity.java类中，如果用户已登录，我们将显示用户信息，否则，它将重定向到LoginActivity.java类。单击按钮时，将使用onClick（）方法注销用户。
MainActivity.java
package example.srcmini.com.volleyregistrationloginsystem;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity implements View.OnClickListener{TextView id, userName, userEmail, gender;
Button btnLogout;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if(SharedPrefManager.getInstance(this).isLoggedIn()){
id = findViewById(R.id.textViewId);
userName = findViewById(R.id.textViewUsername);
userEmail = findViewById(R.id.textViewEmail);
gender = findViewById(R.id.textViewGender);
btnLogout = findViewById(R.id.buttonLogout);
User user = SharedPrefManager.getInstance(this).getUser();
id.setText(String.valueOf(user.getId()));
userEmail.setText(user.getEmail());
gender.setText(user.getGender());
userName.setText(user.getName());
btnLogout.setOnClickListener(this);
}
else{
Intentintent = new Intent(MainActivity.this, LoginActivity.class);
startActivity(intent);
finish();
}
}
public void onClick(View view){
if(view.equals(btnLogout)){
SharedPrefManager.getInstance(getApplicationContext()).logout();
}
}
}在LoginActivity.java类中，我们检查用户是否已经登录，如果为true，则重定向到MainActivity.java类，否则，允许用户登录。
网络模块使用Volley库的StringRequest类。 StringReuest类的对象采用请求方法类型，URL和响应的参数。
LoginActivity.java
package example.srcmini.com.volleyregistrationloginsystem;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.EditText;
import android.widget.ProgressBar;
import android.widget.Toast;
import com.android.volley.AuthFailureError;
import com.android.volley.Request;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.HashMap;
import java.util.Map;
public class LoginActivity extends AppCompatActivity {
EditText etName, etPassword;
ProgressBar progressBar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
if (SharedPrefManager.getInstance(this).isLoggedIn()) {
finish();
startActivity(new Intent(this, MainActivity.class));
}progressBar = findViewById(R.id.progressBar);
etName = findViewById(R.id.etUserName);
etPassword = findViewById(R.id.etUserPassword);
//calling the method userLogin() for login the user
findViewById(R.id.btnLogin).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
userLogin();
}
});
//if user presses on textview not register calling RegisterActivity
findViewById(R.id.tvRegister).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
finish();
startActivity(new Intent(getApplicationContext(), RegisterActivity.class));
}
});
}private void userLogin() {
//first getting the values
final String username = etName.getText().toString();
final String password = etPassword.getText().toString();
//validating inputs
if (TextUtils.isEmpty(username)) {
etName.setError("Please enter your username");
etName.requestFocus();
return;
}if (TextUtils.isEmpty(password)) {
etPassword.setError("Please enter your password");
etPassword.requestFocus();
return;
}//if everything is fine
StringRequest stringRequest = new StringRequest(Request.Method.POST, URLs.URL_LOGIN, new Response.Listener<
String>() {
@Override
public void onResponse(String response) {
progressBar.setVisibility(View.GONE);
try {
//converting response to json object
JSONObject obj = new JSONObject(response);
//if no error in response
if (!obj.getBoolean("error")) {
Toast.makeText(getApplicationContext(), obj.getString("message"), Toast.LENGTH_SHORT).show();
//getting the user from the response
JSONObject userJson = obj.getJSONObject("user");
//creating a new user object
User user = new User(
userJson.getInt("id"), userJson.getString("username"), userJson.getString("email"), userJson.getString("gender")
);
//storing the user in shared preferences
SharedPrefManager.getInstance(getApplicationContext()).userLogin(user);
//starting the profile activity
finish();
startActivity(new Intent(getApplicationContext(), MainActivity.class));
} else {
Toast.makeText(getApplicationContext(), obj.getString("message"), Toast.LENGTH_SHORT).show();
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(getApplicationContext(), error.getMessage(), Toast.LENGTH_SHORT).show();
}
})
{
@Override
protected Map<
String, String> getParams() throws AuthFailureError {
Map<
String, String> params = new HashMap<
>();
params.put("username", username);
params.put("password", password);
return params;
}
};
VolleySingleton.getInstance(this).addToRequestQueue(stringRequest);
}
}RegisterActivity.java类用于注册用户。此类最初检查用户登录是否正确，然后重定向到MainActivity.java类，否则，允许用户注册。
与LoginActivity.java类类似，我们使用Volley库的StringRequest类进行网络连接，并传递类型请求方法，URL和响应的参数。 Response.Listener < String> （）方法处理服务器生成的响应。
RegisterActivity.java
package example.srcmini.com.volleyregistrationloginsystem;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.EditText;
import android.widget.ProgressBar;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Toast;
import com.android.volley.AuthFailureError;
import com.android.volley.Request;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.HashMap;
import java.util.Map;
public class RegisterActivity extends AppCompatActivity {
EditText editTextUsername, editTextEmail, editTextPassword;
RadioGroup radioGroupGender;
ProgressBar progressBar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_register);
progressBar = findViewById(R.id.progressBar);
//if the user is already logged in we will directly start the MainActivity (profile) activity
if (SharedPrefManager.getInstance(this).isLoggedIn()) {
finish();
startActivity(new Intent(this, MainActivity.class));
return;
}editTextUsername = findViewById(R.id.editTextUsername);
editTextEmail = findViewById(R.id.editTextEmail);
editTextPassword = findViewById(R.id.editTextPassword);
radioGroupGender = findViewById(R.id.radioGender);
findViewById(R.id.buttonRegister).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//if user pressed on button register
//here we will register the user to server
registerUser();
}
});
findViewById(R.id.textViewLogin).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//if user pressed on textview that already register open LoginActivity
finish();
startActivity(new Intent(RegisterActivity.this, LoginActivity.class));
}
});
}private void registerUser() {
final String username = editTextUsername.getText().toString().trim();
final String email = editTextEmail.getText().toString().trim();
final String password = editTextPassword.getText().toString().trim();
final String gender = ((RadioButton) findViewById(radioGroupGender.getCheckedRadioButtonId())).getText().toString();
//first we will do the validations
if (TextUtils.isEmpty(username)) {
editTextUsername.setError("Please enter username");
editTextUsername.requestFocus();
return;
}if (TextUtils.isEmpty(email)) {
editTextEmail.setError("Please enter your email");
editTextEmail.requestFocus();
return;
}if (!android.util.Patterns.EMAIL_ADDRESS.matcher(email).matches()) {
editTextEmail.setError("Enter a valid email");
editTextEmail.requestFocus();
return;
}if (TextUtils.isEmpty(password)) {
editTextPassword.setError("Enter a password");
editTextPassword.requestFocus();
return;
}StringRequest stringRequest = new StringRequest(Request.Method.POST, URLs.URL_REGISTER, new Response.Listener<
String>() {
@Override
public void onResponse(String response) {
progressBar.setVisibility(View.GONE);
try {
//converting response to json object
JSONObject obj = new JSONObject(response);
//if no error in response
if (!obj.getBoolean("error")) {
Toast.makeText(getApplicationContext(), obj.getString("message"), Toast.LENGTH_SHORT).show();
//getting the user from the response
JSONObject userJson = obj.getJSONObject("user");
//creating a new user object
User user = new User(
userJson.getInt("id"), userJson.getString("username"), userJson.getString("email"), userJson.getString("gender")
);
//storing the user in shared preferences
SharedPrefManager.getInstance(getApplicationContext()).userLogin(user);
//starting the profile activity
finish();
startActivity(new Intent(getApplicationContext(), MainActivity.class));
} else {
Toast.makeText(getApplicationContext(), obj.getString("message"), Toast.LENGTH_SHORT).show();
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(getApplicationContext(), error.getMessage(), Toast.LENGTH_SHORT).show();
}
}) {
@Override
protected Map<
String, String> getParams() throws AuthFailureError {
Map<
String, String> params = new HashMap<
>();
params.put("username", username);
params.put("email", email);
params.put("password", password);
params.put("gender", gender);
return params;
}
};
VolleySingleton.getInstance(this).addToRequestQueue(stringRequest);
}
}【android volley库注册登录注销】在AndroidManifest.xml文件中添加以下权限
<
uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<
uses-permission android:name="android.permission.INTERNET"/>AndroidManifest.xml
<
?xml version="1.0" encoding="utf-8"?>
<
manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="example.srcmini.com.volleyregistrationloginsystem">
<
uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<
uses-permission android:name="android.permission.INTERNET"/>
<
application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<
activity android:name=".MainActivity">
<
intent-filter>
<
action android:name="android.intent.action.MAIN" /><
category android:name="android.intent.category.LAUNCHER" />
<
/intent-filter>
<
/activity>
<
activity android:name=".LoginActivity" />
<
activity android:name=".RegisterActivity"><
/activity>
<
/application><
/manifest>输出：
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