java 有意图地传递很长时间，总是出错
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Passing long with an intent, always getting error
提问by David Corsalini
I need to pass a long (_id) with an intent from Activity A to Activity B, using this code:
我需要使用以下代码将带有意图的 long (_id) 从活动 A 传递到活动 B：
Intent vip0= new Intent(this, PageSinglePlayerGuess.class);
vip0.putExtra("resid", (long) 1);
startActivity(vip0);
and getting it in Activity B with this method (called in onCreate()):
并使用此方法（在 onCreate() 中调用）在活动 B 中获取它：
public long getResId() {
Intent i= getIntent();
resid= i.getLongExtra("resid", 1);
Log.d("D", "Risorsa: " + resid);
return resid;
}
resid in ActB is a long. I get this error:
驻留在ActB是很长的。我收到此错误：
06-06 11:10:47.138: W/Bundle(538): Key resid expected Long but value was a java.lang.Integer. The default value 1 was returned.
06-06 11:10:47.158: W/Bundle(538): Attempt to cast generated internal exception:
06-06 11:10:47.158: W/Bundle(538): java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.Long
06-06 11:10:47.158: W/Bundle(538): at android.os.Bundle.getLong(Bundle.java:966)
06-06 11:10:47.158: W/Bundle(538): at android.content.Intent.getLongExtra(Intent.java:3874)
06-06 11:10:47.158: W/Bundle(538): at com.gmail.corsalini.celebrityquiz.PageSinglePlayerGuess.getResId(PageSinglePlayerGuess.java:60)
06-06 11:10:47.158: W/Bundle(538): at com.gmail.corsalini.celebrityquiz.PageSinglePlayerGuess.onCreate(PageSinglePlayerGuess.java:46)
06-06 11:10:47.158: W/Bundle(538): at android.app.Activity.performCreate(Activity.java:4465)
06-06 11:10:47.158: W/Bundle(538): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
06-06 11:10:47.158: W/Bundle(538): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
06-06 11:10:47.158: W/Bundle(538): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
06-06 11:10:47.158: W/Bundle(538): at android.app.ActivityThread.access0(ActivityThread.java:123)
06-06 11:10:47.158: W/Bundle(538): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
06-06 11:10:47.158: W/Bundle(538): at android.os.Handler.dispatchMessage(Handler.java:99)
06-06 11:10:47.158: W/Bundle(538): at android.os.Looper.loop(Looper.java:137)
06-06 11:10:47.158: W/Bundle(538): at android.app.ActivityThread.main(ActivityThread.java:4424)
06-06 11:10:47.158: W/Bundle(538): at java.lang.reflect.Method.invokeNative(Native Method)
06-06 11:10:47.158: W/Bundle(538): at java.lang.reflect.Method.invoke(Method.java:511)
06-06 11:10:47.158: W/Bundle(538): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
06-06 11:10:47.158: W/Bundle(538): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
06-06 11:10:47.158: W/Bundle(538): at dalvik.system.NativeStart.main(Native Method)
Any idea how to solve this? (it seems really easy, but i just can't get out of it)
知道如何解决这个问题吗？（看起来很容易，但我就是无法摆脱它）
回答by sinek
According to the log the problem seems to be in following:
根据日志，问题似乎如下：
resid= i.getLongExtra("resid", 1);
resid= i.getLongExtra("resid", 1);
so change it to:
所以将其更改为：
resid= i.getLongExtra("resid", 1L);
resid= i.getLongExtra("resid", 1L);
BTW: the getLongExtra implementation looks like this:
顺便说一句：getLongExtra 实现如下所示：
public long getLongExtra(String name, long defaultValue) {
return mExtras == null ? defaultValue : mExtras.getLong(name, defaultValue);
}
So that's why see that it fails at line:
所以这就是为什么看到它在线失败的原因：
at android.os.Bundle.getLong(Bundle.java:966)
回答by Kazekage Gaara
Change:
改变：
vip0.putExtra("resid", 1L);
A long value is always declared with a Lsuffix.
长值总是用L后缀声明。
回答by FabianCook
Try using Long.valueOf(Integer int) instead of (long) 1
尝试使用 Long.valueOf(Integer int) 而不是 (long) 1
This is because it is being seen as an int still.
这是因为它被视为 int 仍然。
