Android java.lang.Long 不能转换为 java.lang.String [英] Android java.lang.Long cannot be cast to java.lang.String

问题描述

好的，所以我使用

e.putLong("startTime", SystemClock.uptimeMillis());

我从分享偏好中得到它

SHARED_PREFS = context.getSharedPreferences(LOCAL_PREF, MODE_PRIVATE);
long startTime = SHARED_PREFS.getLong("startTime", 0L); <-- Stack trace points to this line.

但我在某些设备上遇到此错误并且不知道为什么，我根本没有尝试将其强制转换为 String.

but I am getting this error on some devices and not sure why, I am not trying to cast it to a String at all.

java.lang.Long cannot be cast to java.lang.String

我发现的一切都指向试图将其设置为 String 值，我根本不想这样做，我试图直接使用 long 值.

Everything I find points towards trying to set this as a String value and I am not trying to do that at all, I am trying to use the long value directly.

** 更新堆栈跟踪 **

** UPDATE STACK TRACE **

Caused by: java.lang.ClassCastException: java.lang.Long cannot be cast to java.lang.String
        at android.app.SharedPreferencesImpl.getString(SharedPreferencesImpl.java:255)
        at com.tech.utility.Tools.refreshPrefs(Tools.java:193)
        at com.tech.activity.Menu_dashboard.onStart(Menu_dashboard.java:762)
        at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1340)
        at android.app.Activity.performStart(Activity.java:7191)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2920)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3032)
        at android.app.ActivityThread.-wrap11(Unknown)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1696)
        at android.os.Handler.dispatchMessage(Handler.java:105)
        at android.os.Looper.loop(Looper.java:164)
        at android.app.ActivityThread.main(ActivityThread.java:6940)
        at java.lang.reflect.Method.invoke(Method.java:-2)
        at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)

推荐答案

如果您要 阅读文档 你会读到 getLong 方法将:

If you were to read the docs you would read that the getLong method will:

如果此名称不长的首选项，则抛出 ClassCastException.

Throws ClassCastException if there is a preference with this name that is not a long.

因此，在应用程序的其他地方，您必须调用:

So, somewhere else in the app, you must have called:

e.putLong("startTime", "someString");

这篇关于Android java.lang.Long 不能转换为 java.lang.String的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！