Question

我刚从http://www.androidhive.info/2012/01/android-login-and-registration-with-php-mysql-and-sqlite/but学习PHP登录和注册PHP，MySQL和SQLite如何创建会话功能，这样我就可以在我的主屏幕（dashboard.xml）中登录。喜欢欢迎“登录用户的名字”。我仍然是Android的初学者，非常感谢你的帮助。

这是我的loginactivity.java

package unai.skripsi.nexttry;
import java.util.HashMap;
import org.json.JSONException;
import org.json.JSONObject;
import unai.skripsi.nexttry.entity.DatabaseHandler;
import unai.skripsi.nexttry.entity.UserFunctions;
import android.app.Activity;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;



public class LoginActivity extends Activity {
Button btnLogin;
Button btnLinkToRegister;
EditText inputEmail;
EditText inputPassword;
TextView loginErrorMsg;


// JSON Response node names
private static String KEY_SUCCESS = "success";
private static String KEY_ERROR = "error";
private static String KEY_ERROR_MSG = "error_msg";
private static String KEY_UID = "uid";
private static String KEY_NAME = "name";
private static String KEY_EMAIL = "email";
private static String KEY_CREATED_AT = "created_at";

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.login);

    // Importing all assets like buttons, text fields
    inputEmail = (EditText) findViewById(R.id.loginEmail);
    inputPassword = (EditText) findViewById(R.id.loginPassword);
    btnLogin = (Button) findViewById(R.id.btnLogin);
    btnLinkToRegister = (Button) findViewById(R.id.btnLinkToRegisterScreen);
    loginErrorMsg = (TextView) findViewById(R.id.login_error);

    // Login button Click Event
    btnLogin.setOnClickListener(new View.OnClickListener() {

        public void onClick(View view) {
            String email = inputEmail.getText().toString();
            String password = inputPassword.getText().toString();  


            new MyAsyncTask().execute(email, password);
        }

            // check for login response
        class MyAsyncTask extends AsyncTask<String, Void, JSONObject> {

            protected JSONObject doInBackground(String... params) {
                UserFunctions userFunction = new UserFunctions();
                    if (params.length != 2)
                            return null;
                    JSONObject json = userFunction.loginUser(params[0], params[1]);
                    return json;
            }

            protected void onPostExecute(JSONObject json) {
                    try {
                if (json != null && json.getString(KEY_SUCCESS) != null) {
                    loginErrorMsg.setText("");
                    String res = json.getString(KEY_SUCCESS);
                    if(Integer.parseInt(res) == 1){
                        // user successfully logged in
                        // Store user details in SQLite Database
                        DatabaseHandler db = new   DatabaseHandler(getApplicationContext());
                        JSONObject json_user = json.getJSONObject("user");

                        // Clear all previous data in database
                        UserFunctions userFunction = new UserFunctions();
                        userFunction.logoutUser(getApplicationContext());
                        db.addUser(json_user.getString(KEY_NAME), json_user.getString(KEY_EMAIL), json.getString(KEY_UID), json_user.getString(KEY_CREATED_AT));                        

                        // Launch Dashboard Screen
                        Intent dashboard = new Intent(getApplicationContext(), DashboardActivity.class);

                        // Close all views before launching Dashboard
                        dashboard.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                        startActivity(dashboard);

                        // Close Login Screen
                        finish();
                    }else{
                        // Error in login
                        loginErrorMsg.setText("Incorrect username/password");
                    }
                }
            } catch (JSONException e) {
                e.printStackTrace();
            }
        }}
    });

    // Link to Register Screen
    btnLinkToRegister.setOnClickListener(new View.OnClickListener() {

        public void onClick(View view) {
            Intent i = new Intent(getApplicationContext(),
                    RegisterActivity.class);
            startActivity(i);
            finish();
        }
    });
   }
}

这是我的Registeractivity.java

package unai.skripsi.nexttry;
import org.json.JSONException;
import org.json.JSONObject;
import unai.skripsi.nexttry.entity.DatabaseHandler;
import unai.skripsi.nexttry.entity.UserFunctions;
import android.app.Activity;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class RegisterActivity extends Activity {
Button btnRegister;
Button btnLinkToLogin;
EditText inputFullName;
EditText inputEmail;
EditText inputPassword;
TextView registerErrorMsg;

// JSON Response node names
private static String KEY_SUCCESS = "success";
private static String KEY_ERROR = "error";
private static String KEY_ERROR_MSG = "error_msg";
private static String KEY_UID = "uid";
private static String KEY_NAME = "name";
private static String KEY_EMAIL = "email";
private static String KEY_CREATED_AT = "created_at";

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.register);

    // Importing all assets like buttons, text fields
    inputFullName = (EditText) findViewById(R.id.registerName);
    inputEmail = (EditText) findViewById(R.id.registerEmail);
    inputPassword = (EditText) findViewById(R.id.registerPassword);
    btnRegister = (Button) findViewById(R.id.btnRegister);
    btnLinkToLogin = (Button) findViewById(R.id.btnLinkToLoginScreen);
    registerErrorMsg = (TextView) findViewById(R.id.register_error);

    // Register Button Click event
    btnRegister.setOnClickListener(new View.OnClickListener() {         
        public void onClick(View view) {
            String name = inputFullName.getText().toString();
            String email = inputEmail.getText().toString();
            String password = inputPassword.getText().toString();
            new MyAsyncTask().execute(name, email, password);
        }

            // check for login response
        class MyAsyncTask extends AsyncTask<String, Void, JSONObject> {

            protected JSONObject doInBackground(String... params) {
                UserFunctions userFunction = new UserFunctions();
                    if (params.length != 3)
                            return null;
                    JSONObject json = userFunction.registerUser(params[0], params[1], params[2]);
                    return json;
            }

            protected void onPostExecute(JSONObject json) {
                    // check for login response
            try {
                if (json != null && json.getString(KEY_SUCCESS) != null) {
                    registerErrorMsg.setText("");
                    String res = json.getString(KEY_SUCCESS);
                    if(Integer.parseInt(res) == 1){
                        // user successfully registred
                        // Store user details in SQLite Database
                        DatabaseHandler db = new DatabaseHandler(getApplicationContext());
                        JSONObject json_user = json.getJSONObject("user");

                        // Clear all previous data in database
                        UserFunctions userFunction = new UserFunctions();
                        userFunction.logoutUser(getApplicationContext());
                        db.addUser(json_user.getString(KEY_NAME), json_user.getString(KEY_EMAIL), json.getString(KEY_UID), json_user.getString(KEY_CREATED_AT));                        
                        // Launch Dashboard Screen
                        Intent dashboard = new Intent(getApplicationContext(), DashboardActivity.class);
                        // Close all views before launching Dashboard
                        dashboard.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                        startActivity(dashboard);
                        // Close Registration Screen
                        finish();
                    }else{
                        // Error in registration
                        registerErrorMsg.setText("Error occured in registration");
                    }
                }
            } catch (JSONException e) {
                e.printStackTrace();
            }
        }}
    });

    // Link to Login Screen
    btnLinkToLogin.setOnClickListener(new View.OnClickListener() {

        public void onClick(View view) {
            Intent i = new Intent(getApplicationContext(),
                    LoginActivity.class);
            startActivity(i);
            // Close Registration View
            finish();
        }
    });
   }
 }

这是我的DashboardActivity.java

package unai.skripsi.nexttry;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import unai.skripsi.nexttry.library.UserFunctions;

public class DashboardActivity extends Activity {
UserFunctions userFunctions;
Button btnLogout;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    /**
     * Dashboard Screen for the application
     * */       
    // Check login status in database
    userFunctions = new UserFunctions();
    if(userFunctions.isUserLoggedIn(getApplicationContext())){
   // user already logged in show databoard
        setContentView(R.layout.dashboard);
        btnLogout = (Button) findViewById(R.id.btnLogout);

        btnLogout.setOnClickListener(new View.OnClickListener() {

            public void onClick(View arg0) {
                // TODO Auto-generated method stub
                userFunctions.logoutUser(getApplicationContext());
                Intent login = new Intent(getApplicationContext(), LoginActivity.class);
                login.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                startActivity(login);
                // Closing dashboard screen
                finish();
            }
        });

    }else{
        // user is not logged in show login screen
        Intent login = new Intent(getApplicationContext(), LoginActivity.class);
        login.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        startActivity(login);
        // Closing dashboard screen
        finish();
    }        
 }
}

这是我的login.xml

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#3b3b3b" >

<LinearLayout
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"
    android:padding="10dip" >
    <!--  View Title Label -->
    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="10dip"
        android:text="LOGIN"
        android:textSize="25dip"
        android:textStyle="bold" />
    <!--  Email Label -->
    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Email" />
    <!--  Email TextField -->
    <EditText
        android:id="@+id/loginEmail"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

    <!--  Password Label -->
    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="15dip"
        android:text="Password" />
    <!--  Password TextField -->
    <EditText
        android:id="@+id/loginPassword"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:password="true" />

    <!--  Error message -->
    <TextView android:id="@+id/login_error"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:textColor="#e30000"
                android:padding="10dip"
                android:textStyle="bold"/>

    <!--  Login Button -->       
    <Button
        android:id="@+id/btnLogin"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dip"
        android:text="Login" />

    <!--  Link to Registration Screen -->
    <Button
        android:id="@+id/btnLinkToRegisterScreen"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="40dip"
        android:background="@null"
        android:text="I don&apos;t have account. Register Me!"
        android:textColor="#21dbd4"
        android:textStyle="bold" />
</LinearLayout>

</ScrollView>

这是我的register.xml

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#3b3b3b" >

<LinearLayout
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"
    android:padding="10dip" >
    <!--  View Title Label -->
    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="10dip"
        android:text="REGISTER"
        android:textSize="25dip"
        android:textStyle="bold" />
    <!--  Name Label -->
    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Full Name" />
    <!--  Name TextField -->
    <EditText
        android:id="@+id/registerName"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

    <!--  Email Label -->
    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Email" />
    <!--  Email TextField -->
    <EditText
        android:id="@+id/registerEmail"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

    <!--  Password Label -->
    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="15dip"
        android:text="Password" />
    <!--  Password TextField -->
    <EditText
        android:id="@+id/registerPassword"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:password="true" />

    <!--  Error message -->
    <TextView android:id="@+id/register_error"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:textColor="#e30000"
                android:padding="10dip"
                android:textStyle="bold"/>

    <!--  Login Button -->       
    <Button
        android:id="@+id/btnRegister"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dip"
        android:text="Register" />

    <!--  Link to Login Screen -->
    <Button
        android:id="@+id/btnLinkToLoginScreen"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="40dip"
        android:background="@null"
        android:text="Already registred. Login Me!"
        android:textColor="#21dbd4"
        android:textStyle="bold" />
</LinearLayout>

</ScrollView>

这是我的dashboard.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="#3b3b3b">

<TextView android:layout_width="fill_parent"
          android:layout_height="wrap_content"
          android:text="WELCOME"
          android:textSize="40dip"
          android:gravity="center"
          android:layout_marginTop="20dip"/>

<Button android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="Logout Me"
    android:textSize="20dip"
    android:textColor="#21dbd4"
    android:textStyle="bold"
    android:id="@+id/btnLogout"
    android:layout_marginTop="80dip"
    android:background="@null"/>

</LinearLayout>

Answer 1

我认为你应该使用shared preferences，

This也是了解不同存储选项的好资源

Android用户会话

1 个答案: