要在Android Studio中记住用户帐户登录,可以使用SharedPreferences存储用户的登录状态和凭据。以下是一个使用Django Rest Framework进行用户登录的示例解决方法:
SharedPrefManager
的辅助类,用于管理SharedPreferences:import android.content.Context;
import android.content.SharedPreferences;
public class SharedPrefManager {
private static final String SHARED_PREF_NAME = "my_shared_pref";
private static final String KEY_USERNAME = "username";
private static final String KEY_TOKEN = "token";
private static SharedPrefManager instance;
private Context context;
private SharedPrefManager(Context context) {
this.context = context;
}
public static synchronized SharedPrefManager getInstance(Context context) {
if (instance == null) {
instance = new SharedPrefManager(context);
}
return instance;
}
public void saveUser(String username, String token) {
SharedPreferences sharedPreferences = context.getSharedPreferences(SHARED_PREF_NAME, Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putString(KEY_USERNAME, username);
editor.putString(KEY_TOKEN, token);
editor.apply();
}
public boolean isLoggedIn() {
SharedPreferences sharedPreferences = context.getSharedPreferences(SHARED_PREF_NAME, Context.MODE_PRIVATE);
return sharedPreferences.getString(KEY_TOKEN, null) != null;
}
public String getUsername() {
SharedPreferences sharedPreferences = context.getSharedPreferences(SHARED_PREF_NAME, Context.MODE_PRIVATE);
return sharedPreferences.getString(KEY_USERNAME, null);
}
public String getToken() {
SharedPreferences sharedPreferences = context.getSharedPreferences(SHARED_PREF_NAME, Context.MODE_PRIVATE);
return sharedPreferences.getString(KEY_TOKEN, null);
}
public void clear() {
SharedPreferences sharedPreferences = context.getSharedPreferences(SHARED_PREF_NAME, Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.clear();
editor.apply();
}
}
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
public class LoginActivity extends AppCompatActivity {
private EditText editTextUsername, editTextPassword;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
editTextUsername = findViewById(R.id.editTextUsername);
editTextPassword = findViewById(R.id.editTextPassword);
}
public void userLogin(View view) {
String username = editTextUsername.getText().toString().trim();
String password = editTextPassword.getText().toString().trim();
// 在这里进行用户登录的Django Rest Framework API调用,获取登录凭据
// 模拟API调用成功后,保存用户凭据
String token = "your_token_here";
SharedPrefManager.getInstance(getApplicationContext()).saveUser(username, token);
Toast.makeText(this, "登录成功", Toast.LENGTH_SHORT).show();
// 跳转到主活动或其他逻辑
}
}
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
private TextView textViewUsername;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textViewUsername = findViewById(R.id.textViewUsername);
// 检查用户是否已登录
if (SharedPrefManager.getInstance(this).isLoggedIn()) {
String username = SharedPrefManager.getInstance(this).getUsername();
textViewUsername.setText("欢迎回来, " + username + "!");
} else {
// 跳转到登录活动或其他逻辑
}
}
}
这样,当用户登录成功后,其用户名和凭据将被保存在SharedPreferences中。在主活动中,您可以检查用户是否已登录并显示相应的欢迎消息。当用户注销或需要重新登录时,可以使用SharedPrefManager
类的clear()
方法清除SharedPreferences中的存储。