如何在此错误处理类中启动Android中的新活动？_Android_Android Intent_Android Activity_Parse Platform_Android Context

如何在此错误处理类中启动Android中的新活动？

android parse-platform

如何在此错误处理类中启动Android中的新活动？,android,android-intent,android-activity,parse-platform,android-context,Android,Android Intent,Android Activity,Parse Platform,Android Context,我对此研究得越多，就越感到困惑。我承认我对Android的东西还很陌生。也许有人可以根据我的具体问题向我解释这一点 public class ParseErrorHandler { public static void handleParseError(ParseException e, Context context) { switch(e.getMessage()) { case "invalid session token": handleInvalidSessio

我对此研究得越多，就越感到困惑。我承认我对Android的东西还很陌生。也许有人可以根据我的具体问题向我解释这一点

public class ParseErrorHandler {
public static void handleParseError(ParseException e, Context context) {
    switch(e.getMessage()) {
        case "invalid session token": handleInvalidSessionToken(context);
            break;
        default: handleGeneralError(e, context);
            break;
    }
}

private static void handleInvalidSessionToken(final Context context) {
    AlertDialog.Builder alert = new AlertDialog.Builder(context);

    alert.setMessage("Oops! Your session is no longer valid. Please sign in again.")
            .setCancelable(false)
            .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    revertToSignIn(context);
                }
            });
    alert.create().show();
}

private static void handleGeneralError(ParseException e, Context context) {
    AlertDialog.Builder alert = new AlertDialog.Builder(context);

    alert.setMessage("Oops! Fitness Evolution had a server issue.\n\nError: " + e.getMessage() +
            "\n\nSome functionality may be temporarily unavailable. We apologize for the inconvenience")
            .setCancelable(false)
            .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    //If you want OK button to do anything special, put it here
                }
            });
    alert.create().show();
}

private static void revertToSignIn(Context context) {
    ParseUser.logOut();

    Global.loggedIn = false;
    Global.user = ParseUser.getCurrentUser();

    Intent intent = new Intent(context, ActivityStartup.class);
    context.startActivity(intent);
}
}

在Android应用程序中，我有一个主要的活动。以下是上述活动的相关代码

installation.saveInBackground(new SaveCallback() {
        public void done(ParseException e) {
            if (e == null) {
                Log.v("PRBTEST","Successful save of installation");
            } else {
                Log.v("PRBTEST","Unsuccesfull save of installation: " + e.getMessage());

                ParseErrorHandler.handleParseError(e);
            }
        }

public class ParseErrorHandler {
public static void handleParseError(ParseException e, Context context) {
    switch(e.getMessage()) {
        case "invalid session token": handleInvalidSessionToken(context);
            break;
        default: handleGeneralError(e, context);
            break;
    }
}

private static void handleInvalidSessionToken(final Context context) {
    AlertDialog.Builder alert = new AlertDialog.Builder(context);

    alert.setMessage("Oops! Your session is no longer valid. Please sign in again.")
            .setCancelable(false)
            .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    revertToSignIn(context);
                }
            });
    alert.create().show();
}

private static void handleGeneralError(ParseException e, Context context) {
    AlertDialog.Builder alert = new AlertDialog.Builder(context);

    alert.setMessage("Oops! Fitness Evolution had a server issue.\n\nError: " + e.getMessage() +
            "\n\nSome functionality may be temporarily unavailable. We apologize for the inconvenience")
            .setCancelable(false)
            .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    //If you want OK button to do anything special, put it here
                }
            });
    alert.create().show();
}

private static void revertToSignIn(Context context) {
    ParseUser.logOut();

    Global.loggedIn = false;
    Global.user = ParseUser.getCurrentUser();

    Intent intent = new Intent(context, ActivityStartup.class);
    context.startActivity(intent);
}
}

这段代码位于onCreate（）函数的末尾，旨在解决Parse.com（我们的后端服务器）出现的会话令牌无效的问题。错误处理程序应该检查错误，并根据错误的类型对其进行处理。目前我们只有一个上下文，即会话令牌错误。作为响应，它会给你一个弹出窗口，告诉你再次登录，并将你发送回启动屏幕，在那里你可以登录

public class ParseErrorHandler {
public static void handleParseError(ParseException e, Context context) {
    switch(e.getMessage()) {
        case "invalid session token": handleInvalidSessionToken(context);
            break;
        default: handleGeneralError(e, context);
            break;
    }
}

private static void handleInvalidSessionToken(final Context context) {
    AlertDialog.Builder alert = new AlertDialog.Builder(context);

    alert.setMessage("Oops! Your session is no longer valid. Please sign in again.")
            .setCancelable(false)
            .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    revertToSignIn(context);
                }
            });
    alert.create().show();
}

private static void handleGeneralError(ParseException e, Context context) {
    AlertDialog.Builder alert = new AlertDialog.Builder(context);

    alert.setMessage("Oops! Fitness Evolution had a server issue.\n\nError: " + e.getMessage() +
            "\n\nSome functionality may be temporarily unavailable. We apologize for the inconvenience")
            .setCancelable(false)
            .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    //If you want OK button to do anything special, put it here
                }
            });
    alert.create().show();
}

private static void revertToSignIn(Context context) {
    ParseUser.logOut();

    Global.loggedIn = false;
    Global.user = ParseUser.getCurrentUser();

    Intent intent = new Intent(context, ActivityStartup.class);
    context.startActivity(intent);
}
}

下面是错误处理程序类

public class ParseErrorHandler {

public static void handleParseError(ParseException e) {
    switch(e.getMessage()) {
        case "invalid session token": handleInvalidSessionToken();
                break;
    }
}

private static void handleInvalidSessionToken() {
    AlertDialog.Builder alert = new AlertDialog.Builder(//...);

    alert.setMessage("Oops! Your session is no longer valid. Please sign in again.")
            .setCancelable(false)
            .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    revertToSignIn();
                }
            });
    alert.create().show();
}

private static void revertToSignIn() {
    ParseUser.logOut();

    Global.loggedIn = false;
    Global.user = ParseUser.getCurrentUser();

    Intent intent = new Intent(//..., ActivityStartup.class);
    startActivity(intent); //<<this line can't be resolved at the moment
    finish(); //<<this line can't be resolved at the moment
}

public class ParseErrorHandler {
public static void handleParseError(ParseException e, Context context) {
    switch(e.getMessage()) {
        case "invalid session token": handleInvalidSessionToken(context);
            break;
        default: handleGeneralError(e, context);
            break;
    }
}

private static void handleInvalidSessionToken(final Context context) {
    AlertDialog.Builder alert = new AlertDialog.Builder(context);

    alert.setMessage("Oops! Your session is no longer valid. Please sign in again.")
            .setCancelable(false)
            .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    revertToSignIn(context);
                }
            });
    alert.create().show();
}

private static void handleGeneralError(ParseException e, Context context) {
    AlertDialog.Builder alert = new AlertDialog.Builder(context);

    alert.setMessage("Oops! Fitness Evolution had a server issue.\n\nError: " + e.getMessage() +
            "\n\nSome functionality may be temporarily unavailable. We apologize for the inconvenience")
            .setCancelable(false)
            .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    //If you want OK button to do anything special, put it here
                }
            });
    alert.create().show();
}

private static void revertToSignIn(Context context) {
    ParseUser.logOut();

    Global.loggedIn = false;
    Global.user = ParseUser.getCurrentUser();

    Intent intent = new Intent(context, ActivityStartup.class);
    context.startActivity(intent);
}
}

公共类ParseErrorHandler{
公共静态无效handleParseError（ParseException e）{
开关（如getMessage（））{
案例“无效会话令牌”：handleInvalidSessionToken（）；
打破
}
}
私有静态void handleInvalidSessionToken（）{
AlertDialog.Builder alert=新建AlertDialog.Builder（//…）；
alert.setMessage（“哎呀！您的会话不再有效。请重新登录。”）
.setCancelable（错误）
.setPositiveButton（“确定”，新的DialogInterface.OnClickListener（）{
public void onClick（DialogInterface对话框，int-id）{
回复信号素（）；
}
});
alert.create（）.show（）；
}
私有静态void revertToSignIn（）{
ParseUser.logOut（）；
Global.loggedIn=false；
Global.user=ParseUser.getCurrentUser（）；
意向意向=新意向（//…，ActivityStartup.class）；
开始活动（意图）；//**活动：-**
saveInBackground（新的SaveCallback（）{
公共作废完成（Parsee异常）{
如果（e==null）{
Log.v（“PRBTEST”，“成功保存安装”）；
}否则{
Log.v（“PRBTEST”，“安装完全保存失败：”+e.getMessage（））；
ParseErrorHandler.handleParseError（e，ActivityName.this）；
}
}
**解析类：**
公共类ParseErrorHandler{
公共静态void handleParseError（解析异常e，上下文）{
开关（如getMessage（））{
案例“无效会话令牌”：handleInvalidSessionToken（上下文）；
打破
}
}
私有静态void handleInvalidSessionToken（上下文）{
AlertDialog.Builder alert=新建AlertDialog.Builder（//…）；
alert.setMessage（“哎呀！您的会话不再有效。请重新登录。”）
.setCancelable（错误）
.setPositiveButton（“确定”，新的DialogInterface.OnClickListener（）{
public void onClick（DialogInterface对话框，int-id）{
回复信号（上下文）；
}
});
alert.create（）.show（）；
}
私有静态void revertToSignIn（上下文）{
ParseUser.logOut（）；
Global.loggedIn=false；
Global.user=ParseUser.getCurrentUser（）；
意向意向=新意向（上下文，ActivityStartup.class）；
背景。开始触觉（意图）//
我一辈子都不明白这些上下文是什么，以及如何理解
它们起作用了，每一个在线解释都会越来越多
抽象的
public class ParseErrorHandler {
public static void handleParseError(ParseException e, Context context) {
    switch(e.getMessage()) {
        case "invalid session token": handleInvalidSessionToken(context);
            break;
        default: handleGeneralError(e, context);
            break;
    }
}

private static void handleInvalidSessionToken(final Context context) {
    AlertDialog.Builder alert = new AlertDialog.Builder(context);

    alert.setMessage("Oops! Your session is no longer valid. Please sign in again.")
            .setCancelable(false)
            .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    revertToSignIn(context);
                }
            });
    alert.create().show();
}

private static void handleGeneralError(ParseException e, Context context) {
    AlertDialog.Builder alert = new AlertDialog.Builder(context);

    alert.setMessage("Oops! Fitness Evolution had a server issue.\n\nError: " + e.getMessage() +
            "\n\nSome functionality may be temporarily unavailable. We apologize for the inconvenience")
            .setCancelable(false)
            .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    //If you want OK button to do anything special, put it here
                }
            });
    alert.create().show();
}

private static void revertToSignIn(Context context) {
    ParseUser.logOut();

    Global.loggedIn = false;
    Global.user = ParseUser.getCurrentUser();

    Intent intent = new Intent(context, ActivityStartup.class);
    context.startActivity(intent);
}
}

这是我得到的有关上下文的信息，将帮助你
public class ParseErrorHandler {
public static void handleParseError(ParseException e, Context context) {
    switch(e.getMessage()) {
        case "invalid session token": handleInvalidSessionToken(context);
            break;
        default: handleGeneralError(e, context);
            break;
    }
}

private static void handleInvalidSessionToken(final Context context) {
    AlertDialog.Builder alert = new AlertDialog.Builder(context);

    alert.setMessage("Oops! Your session is no longer valid. Please sign in again.")
            .setCancelable(false)
            .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    revertToSignIn(context);
                }
            });
    alert.create().show();
}

private static void handleGeneralError(ParseException e, Context context) {
    AlertDialog.Builder alert = new AlertDialog.Builder(context);

    alert.setMessage("Oops! Fitness Evolution had a server issue.\n\nError: " + e.getMessage() +
            "\n\nSome functionality may be temporarily unavailable. We apologize for the inconvenience")
            .setCancelable(false)
            .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    //If you want OK button to do anything special, put it here
                }
            });
    alert.create().show();
}

private static void revertToSignIn(Context context) {
    ParseUser.logOut();

    Global.loggedIn = false;
    Global.user = ParseUser.getCurrentUser();

    Intent intent = new Intent(context, ActivityStartup.class);
    context.startActivity(intent);
}
}


public class ParseErrorHandler {
public static void handleParseError(ParseException e, Context context) {
    switch(e.getMessage()) {
        case "invalid session token": handleInvalidSessionToken(context);
            break;
        default: handleGeneralError(e, context);
            break;
    }
}

private static void handleInvalidSessionToken(final Context context) {
    AlertDialog.Builder alert = new AlertDialog.Builder(context);

    alert.setMessage("Oops! Your session is no longer valid. Please sign in again.")
            .setCancelable(false)
            .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    revertToSignIn(context);
                }
            });
    alert.create().show();
}

private static void handleGeneralError(ParseException e, Context context) {
    AlertDialog.Builder alert = new AlertDialog.Builder(context);

    alert.setMessage("Oops! Fitness Evolution had a server issue.\n\nError: " + e.getMessage() +
            "\n\nSome functionality may be temporarily unavailable. We apologize for the inconvenience")
            .setCancelable(false)
            .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    //If you want OK button to do anything special, put it here
                }
            });
    alert.create().show();
}

private static void revertToSignIn(Context context) {
    ParseUser.logOut();

    Global.loggedIn = false;
    Global.user = ParseUser.getCurrentUser();

    Intent intent = new Intent(context, ActivityStartup.class);
    context.startActivity(intent);
}
}


public class ParseErrorHandler {
public static void handleParseError(ParseException e, Context context) {
    switch(e.getMessage()) {
        case "invalid session token": handleInvalidSessionToken(context);
            break;
        default: handleGeneralError(e, context);
            break;
    }
}

private static void handleInvalidSessionToken(final Context context) {
    AlertDialog.Builder alert = new AlertDialog.Builder(context);

    alert.setMessage("Oops! Your session is no longer valid. Please sign in again.")
            .setCancelable(false)
            .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    revertToSignIn(context);
                }
            });
    alert.create().show();
}

private static void handleGeneralError(ParseException e, Context context) {
    AlertDialog.Builder alert = new AlertDialog.Builder(context);

    alert.setMessage("Oops! Fitness Evolution had a server issue.\n\nError: " + e.getMessage() +
            "\n\nSome functionality may be temporarily unavailable. We apologize for the inconvenience")
            .setCancelable(false)
            .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    //If you want OK button to do anything special, put it here
                }
            });
    alert.create().show();
}

private static void revertToSignIn(Context context) {
    ParseUser.logOut();

    Global.loggedIn = false;
    Global.user = ParseUser.getCurrentUser();

    Intent intent = new Intent(context, ActivityStartup.class);
    context.startActivity(intent);
}
}

对于您的问题，首先在主活动中创建上下文，然后执行以下操作
    private Context context;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_all_category);
        context = this;
       .
       .
       .
       .
       .
       installation.saveInBackground(new SaveCallback() {
            public void done(ParseException e) {
                if (e == null) {
                    Log.v("PRBTEST","Successful save of installation");
                } else {
                    Log.v("PRBTEST","Unsuccesfull save of installation: " + e.getMessage());

                    ParseErrorHandler handler = new ParseErrorHandler(context);
                    handler.handleParseError(context, e);
                }
            }

public class ParseErrorHandler {
public static void handleParseError(ParseException e, Context context) {
    switch(e.getMessage()) {
        case "invalid session token": handleInvalidSessionToken(context);
            break;
        default: handleGeneralError(e, context);
            break;
    }
}

private static void handleInvalidSessionToken(final Context context) {
    AlertDialog.Builder alert = new AlertDialog.Builder(context);

    alert.setMessage("Oops! Your session is no longer valid. Please sign in again.")
            .setCancelable(false)
            .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    revertToSignIn(context);
                }
            });
    alert.create().show();
}

private static void handleGeneralError(ParseException e, Context context) {
    AlertDialog.Builder alert = new AlertDialog.Builder(context);

    alert.setMessage("Oops! Fitness Evolution had a server issue.\n\nError: " + e.getMessage() +
            "\n\nSome functionality may be temporarily unavailable. We apologize for the inconvenience")
            .setCancelable(false)
            .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    //If you want OK button to do anything special, put it here
                }
            });
    alert.create().show();
}

private static void revertToSignIn(Context context) {
    ParseUser.logOut();

    Global.loggedIn = false;
    Global.user = ParseUser.getCurrentUser();

    Intent intent = new Intent(context, ActivityStartup.class);
    context.startActivity(intent);
}
}

现在，在ParseErrorHandler.java类中创建构造函数，该类包含上下文，可帮助您在所有方法中执行类似操作
private Context context;
    public class ParseErrorHandler {

        public ParseErrorHandler(Context context) {
            this.context = context;
        }

        // your other code...

        private static void revertToSignIn() {
            ParseUser.logOut();

            Global.loggedIn = false;
            Global.user = ParseUser.getCurrentUser();

            Intent intent = new Intent(context, ActivityStartup.class);
            startActivity(intent); 
            finish(); 
        }
    }

public class ParseErrorHandler {
public static void handleParseError(ParseException e, Context context) {
    switch(e.getMessage()) {
        case "invalid session token": handleInvalidSessionToken(context);
            break;
        default: handleGeneralError(e, context);
            break;
    }
}

private static void handleInvalidSessionToken(final Context context) {
    AlertDialog.Builder alert = new AlertDialog.Builder(context);

    alert.setMessage("Oops! Your session is no longer valid. Please sign in again.")
            .setCancelable(false)
            .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    revertToSignIn(context);
                }
            });
    alert.create().show();
}

private static void handleGeneralError(ParseException e, Context context) {
    AlertDialog.Builder alert = new AlertDialog.Builder(context);

    alert.setMessage("Oops! Fitness Evolution had a server issue.\n\nError: " + e.getMessage() +
            "\n\nSome functionality may be temporarily unavailable. We apologize for the inconvenience")
            .setCancelable(false)
            .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    //If you want OK button to do anything special, put it here
                }
            });
    alert.create().show();
}

private static void revertToSignIn(Context context) {
    ParseUser.logOut();

    Global.loggedIn = false;
    Global.user = ParseUser.getCurrentUser();

    Intent intent = new Intent(context, ActivityStartup.class);
    context.startActivity(intent);
}
}

希望这能对你有所帮助！！
根据以上两个答案，我得到了最后的代码，与他们的答案相似但不同。这段代码编译并运行得很好！当然还有一些补充
public class ParseErrorHandler {
public static void handleParseError(ParseException e, Context context) {
    switch(e.getMessage()) {
        case "invalid session token": handleInvalidSessionToken(context);
            break;
        default: handleGeneralError(e, context);
            break;
    }
}

private static void handleInvalidSessionToken(final Context context) {
    AlertDialog.Builder alert = new AlertDialog.Builder(context);

    alert.setMessage("Oops! Your session is no longer valid. Please sign in again.")
            .setCancelable(false)
            .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    revertToSignIn(context);
                }
            });
    alert.create().show();
}

private static void handleGeneralError(ParseException e, Context context) {
    AlertDialog.Builder alert = new AlertDialog.Builder(context);

    alert.setMessage("Oops! Fitness Evolution had a server issue.\n\nError: " + e.getMessage() +
            "\n\nSome functionality may be temporarily unavailable. We apologize for the inconvenience")
            .setCancelable(false)
            .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    //If you want OK button to do anything special, put it here
                }
            });
    alert.create().show();
}

private static void revertToSignIn(Context context) {
    ParseUser.logOut();

    Global.loggedIn = false;
    Global.user = ParseUser.getCurrentUser();

    Intent intent = new Intent(context, ActivityStartup.class);
    context.startActivity(intent);
}
}

ActivityMain.class中的代码是：
public class ParseErrorHandler {
public static void handleParseError(ParseException e, Context context) {
    switch(e.getMessage()) {
        case "invalid session token": handleInvalidSessionToken(context);
            break;
        default: handleGeneralError(e, context);
            break;
    }
}

private static void handleInvalidSessionToken(final Context context) {
    AlertDialog.Builder alert = new AlertDialog.Builder(context);

    alert.setMessage("Oops! Your session is no longer valid. Please sign in again.")
            .setCancelable(false)
            .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    revertToSignIn(context);
                }
            });
    alert.create().show();
}

private static void handleGeneralError(ParseException e, Context context) {
    AlertDialog.Builder alert = new AlertDialog.Builder(context);

    alert.setMessage("Oops! Fitness Evolution had a server issue.\n\nError: " + e.getMessage() +
            "\n\nSome functionality may be temporarily unavailable. We apologize for the inconvenience")
            .setCancelable(false)
            .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    //If you want OK button to do anything special, put it here
                }
            });
    alert.create().show();
}

private static void revertToSignIn(Context context) {
    ParseUser.logOut();

    Global.loggedIn = false;
    Global.user = ParseUser.getCurrentUser();

    Intent intent = new Intent(context, ActivityStartup.class);
    context.startActivity(intent);
}
}

 Log.v("parse installation", "updating user");
    ParseInstallation installation = ParseInstallation.getCurrentInstallation();
    installation.put("user", Global.user.getUsername());
    installation.saveInBackground(new SaveCallback() {
        public void done(ParseException e) {
            if (e == null) {
                Log.v("PRBTEST","Successful save of installation");
            } else {
                Log.v("PRBTEST","Unsuccessful save of installation: " + e.getMessage());

                ParseErrorHandler.handleParseError(e, ActivityMain.this);
            }
        }
    });

    Log.v("parse installation", "updated user: " + ParseInstallation.getCurrentInstallation().get("user"));

我没有意识到的一件大事是，我必须从上下文调用.startActivity。比如CONTEXT.startActivity（）。

public class ParseErrorHandler {
public static void handleParseError(ParseException e, Context context) {
    switch(e.getMessage()) {
        case "invalid session token": handleInvalidSessionToken(context);
            break;
        default: handleGeneralError(e, context);
            break;
    }
}

private static void handleInvalidSessionToken(final Context context) {
    AlertDialog.Builder alert = new AlertDialog.Builder(context);

    alert.setMessage("Oops! Your session is no longer valid. Please sign in again.")
            .setCancelable(false)
            .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    revertToSignIn(context);
                }
            });
    alert.create().show();
}

private static void handleGeneralError(ParseException e, Context context) {
    AlertDialog.Builder alert = new AlertDialog.Builder(context);

    alert.setMessage("Oops! Fitness Evolution had a server issue.\n\nError: " + e.getMessage() +
            "\n\nSome functionality may be temporarily unavailable. We apologize for the inconvenience")
            .setCancelable(false)
            .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    //If you want OK button to do anything special, put it here
                }
            });
    alert.create().show();
}

private static void revertToSignIn(Context context) {
    ParseUser.logOut();

    Global.loggedIn = false;
    Global.user = ParseUser.getCurrentUser();

    Intent intent = new Intent(context, ActivityStartup.class);
    context.startActivity(intent);
}
}

谢谢大家。将活动上下文传递给方法并调用上下文。sartActivity（intent）；谢谢！我明白了，我需要从您传递的上下文中调用startActivity。这很有帮助。我仍然需要做一些更改，但这让我得到了一些工作代码。这与其他响应一样有效。我认为这一个实际上更优雅一些。在发布问题后的最后几个小时里，我已经了解了一些但这也有帮助，谢谢。
public class ParseErrorHandler {
public static void handleParseError(ParseException e, Context context) {
    switch(e.getMessage()) {
        case "invalid session token": handleInvalidSessionToken(context);
            break;
        default: handleGeneralError(e, context);
            break;
    }
}

private static void handleInvalidSessionToken(final Context context) {
    AlertDialog.Builder alert = new AlertDialog.Builder(context);

    alert.setMessage("Oops! Your session is no longer valid. Please sign in again.")
            .setCancelable(false)
            .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    revertToSignIn(context);
                }
            });
    alert.create().show();
}

private static void handleGeneralError(ParseException e, Context context) {
    AlertDialog.Builder alert = new AlertDialog.Builder(context);

    alert.setMessage("Oops! Fitness Evolution had a server issue.\n\nError: " + e.getMessage() +
            "\n\nSome functionality may be temporarily unavailable. We apologize for the inconvenience")
            .setCancelable(false)
            .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    //If you want OK button to do anything special, put it here
                }
            });
    alert.create().show();
}

private static void revertToSignIn(Context context) {
    ParseUser.logOut();

    Global.loggedIn = false;
    Global.user = ParseUser.getCurrentUser();

    Intent intent = new Intent(context, ActivityStartup.class);
    context.startActivity(intent);
}
}