java Android 中 RuntimeException("Stub!") 的含义
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/39913574/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
meaning of RuntimeException("Stub!") in Android
提问by Alex Mawashi
I was surfing in Android code because I wanted to see what is into Activity.finish() method.
我正在浏览 Android 代码，因为我想看看 Activity.finish() 方法中有什么。
I just wanted to have the confirmation that in Activity.finish()there would be a call to onDestroy()method.
我只是想确认Activity.finish()那里会调用onDestroy()方法。
But what I found in this method (and in many others) was:
但是我在这种方法（以及许多其他方法）中发现的是：
public void finish() {
throw new RuntimeException("Stub!");
}
So WHERE Can I find the code that really destroys the Activity? Thanks!
那么在哪里可以找到真正破坏Activity的代码呢？谢谢！
采纳答案by hakim
This is because source code is not found in SDK.
To see the source code, you need to download source for Android SDK, so Android studio can display the respective code.
这是因为在 SDK 中找不到源代码。看源码需要下载Android SDK的源码，Android studio才能显示相应的代码。
回答by Tim
I don't know where you looked, but the code for finish()is this
我不知道你在哪里看的，但代码finish()是这样的
/**
* Call this when your activity is done and should be closed. The
* ActivityResult is propagated back to whoever launched you via
* onActivityResult().
*/
public void finish() {
finish(DONT_FINISH_TASK_WITH_ACTIVITY);
}
which calls the private implementation
它调用私有实现
/**
* Finishes the current activity and specifies whether to remove the task associated with this
* activity.
*/
private void finish(int finishTask) {
if (mParent == null) {
int resultCode;
Intent resultData;
synchronized (this) {
resultCode = mResultCode;
resultData = mResultData;
}
if (false) Log.v(TAG, "Finishing self: token=" + mToken);
try {
if (resultData != null) {
resultData.prepareToLeaveProcess(this);
}
if (ActivityManagerNative.getDefault()
.finishActivity(mToken, resultCode, resultData, finishTask)) {
mFinished = true;
}
} catch (RemoteException e) {
// Empty
}
} else {
mParent.finishFromChild(this);
}
}
Important here is ActivityManagerNative.getDefault().finishActivitywhich you can find at line 3359 in this file https://android.googlesource.com/platform/frameworks/base/+/master/core/java/android/app/ActivityManagerNative.java
这里重要的是ActivityManagerNative.getDefault().finishActivity你可以在这个文件的第 3359 行找到https://android.googlesource.com/platform/frameworks/base/+/master/core/java/android/app/ActivityManagerNative.java
If you want to dive deeper, you can just follow the trail.
如果你想更深入地潜水，你可以沿着小路走。
回答by Mundroid
You are checking in .class not .java file.
您正在签入 .class 而不是 .java 文件。
