在处理令牌过期问题时，可以使用MSAL Android SDK来刷新令牌。以下是使用MSAL Android SDK刷新令牌的解决方法，包含代码示例：

1. 在build.gradle文件中添加MSAL Android SDK的依赖项：

implementation 'com.microsoft.identity.client:msal:1.4.0'

2. 创建一个单例类来处理身份验证，例如AuthManager：

import android.app.Activity;
import android.content.Context;
import android.util.Log;

import androidx.annotation.NonNull;

import com.microsoft.identity.client.AuthenticationCallback;
import com.microsoft.identity.client.AuthenticationResult;
import com.microsoft.identity.client.IAccount;
import com.microsoft.identity.client.IAuthenticationResult;
import com.microsoft.identity.client.IPublicClientApplication;
import com.microsoft.identity.client.ISingleAccountPublicClientApplication;
import com.microsoft.identity.client.PublicClientApplication;
import com.microsoft.identity.client.exception.MsalException;

public class AuthManager {
    private static final String TAG = AuthManager.class.getSimpleName();

    private static AuthManager sInstance;

    private ISingleAccountPublicClientApplication mSingleAccountApp;

    private AuthManager(Context context) {
        PublicClientApplication.createSingleAccountPublicClientApplication(
                context,
                R.raw.auth_config,
                new IPublicClientApplication.ISingleAccountApplicationCreatedListener() {
                    @Override
                    public void onCreated(ISingleAccountPublicClientApplication application) {
                        mSingleAccountApp = application;
                    }

                    @Override
                    public void onError(MsalException exception) {
                        Log.e(TAG, "Failed to create MSAL application: " + exception.getMessage());
                    }
                }
        );
    }

    public static AuthManager getInstance(Context context) {
        if (sInstance == null) {
            synchronized (AuthManager.class) {
                if (sInstance == null) {
                    sInstance = new AuthManager(context);
                }
            }
        }
        return sInstance;
    }

    public void acquireToken(Activity activity, String[] scopes, AuthenticationCallback callback) {
        if (mSingleAccountApp != null) {
            mSingleAccountApp.acquireToken(activity, scopes, callback);
        } else {
            Log.e(TAG, "MSAL application is not initialized.");
        }
    }

    public void refreshToken(Activity activity, String[] scopes, IAccount account, AuthenticationCallback callback) {
        if (mSingleAccountApp != null) {
            mSingleAccountApp.acquireTokenSilentAsync(scopes, account, callback);
        } else {
            Log.e(TAG, "MSAL application is not initialized.");
        }
    }
}

3. 在使用令牌的地方，例如在Activity中，首先调用acquireToken方法来获取初始令牌。然后，在令牌过期时，调用refreshToken方法来刷新令牌。

import android.os.Bundle;
import android.util.Log;

import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;

import com.microsoft.identity.client.AuthenticationCallback;
import com.microsoft.identity.client.AuthenticationResult;
import com.microsoft.identity.client.IAccount;
import com.microsoft.identity.client.exception.MsalException;

public class MainActivity extends AppCompatActivity {
    private static final String TAG = MainActivity.class.getSimpleName();

    private AuthManager mAuthManager;

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

        mAuthManager = AuthManager.getInstance(this);

        String[] scopes = {"User.Read"};

        AuthenticationCallback callback = new AuthenticationCallback() {
            @Override
            public void onSuccess(AuthenticationResult authenticationResult) {
                // 使用令牌进行操作
                String accessToken = authenticationResult.getAccessToken();
                Log.d(TAG, "Access token: " + accessToken);
            }

            @Override
            public void onError(MsalException exception) {
                Log.e(TAG, "Failed to acquire token: " + exception.getMessage());
            }

            @Override
            public void onCancel() {
                Log.d(TAG, "Authentication cancelled.");
            }
        };

        mAuthManager.acquireToken(this, scopes, callback);
    }

    private void refreshToken(IAccount account) {
        String[] scopes = {"User.Read"};

        AuthenticationCallback callback = new AuthenticationCallback() {
            @Override
            public void onSuccess(AuthenticationResult authenticationResult) {
                // 使用刷新后的令牌进行操作
                String accessToken = authenticationResult.getAccessToken();
                Log.d(TAG, "Refreshed access token: " + accessToken);
            }

            @Override
            public void onError(MsalException exception) {
                Log.e(TAG, "Failed to refresh token: " + exception.getMessage());
            }

            @Override
            public void onCancel() {
                Log.d(TAG, "Token refresh cancelled.");
            }
        };

        mAuthManager.refresh