增加对本地是否有用户身份的判断

app/src/main/java/com/pkusz/min_vpn_client/activity/login/LoginActivity.java

@@ -25,6 +25,7 @@ import com.pkusz.min_vpn_client.model.OriginalRequest.OriginalGetVpnInfoRequest;
 import com.pkusz.min_vpn_client.model.OriginalRequest.OriginalLoginRequest;
 import com.pkusz.min_vpn_client.utils.AccountValidatorRegexUtil;
 import com.pkusz.min_vpn_client.utils.DigestUtilKt;
+import com.pkusz.min_vpn_client.utils.KeyManager;
 
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
@@ -149,6 +150,14 @@ public class LoginActivity extends MINVpnBaseActivity<LoginActivityPresenter>
             this.rawUsername = Objects.requireNonNull(etUsername.getText()).toString();
             this.rawPassword = Objects.requireNonNull(etPassword.getText()).toString();
 
+            // 登录前判断本地是否有身份信息，如果无，则提醒使用新设备登录界面
+            boolean isHaveIdentity= KeyManager.INSTANCE.isInKeyChain("/"+this.rawUsername);
+            if(!isHaveIdentity){
+                showWarning("本地无此用户身份("+this.rawUsername+"),请使用\"新设备\"登录按钮进行登录。");
+                btnLogin.revertAnimation();
+                return;
+            }
+
 //            boolean testFlag=true;
 //            if(!testFlag){
                 if (rawUsername.isEmpty() || rawPassword.isEmpty()) {