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Jean-Marie Mineau 2025-08-12 18:43:28 +02:00
parent 94d26973d3
commit 5e512b585a
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4_class_loader/2_classloading.typ
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@ -40,7 +40,21 @@ When used directly by ART, the classes are usually stored in an application file
#image(
"figs/classloaders-crop.svg",
width: 80%,
alt: ""
alt: "
A box diagram. The diagram is split into two; the right section is labeled Runtime.
On the left, there are 9 boxes. 3 are gray, labeled ClassLoader, SecureClassLoader, and URLClassLoader, and the other 6 are white: BootClassLoader, BaseDexClassLoader, DexClassLoader, InMemoryDexClassLoader, PathClassLoader, and DelegateLastClassLoader.
Arrows go from SecureClassLoader, BaseDexClassLoader, and BootClassLoader to ClassLoader,
from URLClassLoader to SecureClassLoader,
from DexClassLoader, InMemoryDexClassLoader, and PathClassLoader to BaseDexClassLoader,
and from DelegateLastClassLoader to PathClassLoader.
On the runtime side, there are 5 boxes: bootClassLoader, appClassLoader (multi dex), systemClassLoader,
Specific delegator with two delegates, X.
Arrows labeled delegate go from appClassLoader, systemClassLoader, and Specific delegator to bootClassLoader, and from Specific delegator to X.
bootClassLoader, appClassLoader, and systemClassLoader are grouped in a dotted box labeled Android default behavior.
Dotted lines labeled instance go across the central demarcation from appClassLoader to PathClassLoader, from systemClassLoader to PathClassLoader, and from Specific delegator to DelegateLastClassLoader.
Another dotted line labeled instance singleton goes from bootClassLoader to BootClassLoader.
"
)
gray -- Java-based, white -- Android-based
],
@ -115,7 +129,19 @@ We discuss in the next section how to obtain these classes from the emulator.
image(
"figs/architecture_SDK-crop.svg",
width: 80%,
alt: ""
alt: "
On the top right, a diagram of a web browser open at https//develoer.android.com, with the webpage reading: API documentation, SDK classes, and method descriptions.
The web browser is labelled Documentation.
On the bottom right, a box with the Android Studio logo (a blue pair of compasses in front of a green robot) is labeled 'Development Environment'.
It contains two boxes: Developer classes and android.jar, and the text Dev SDK classes in bold.
An arrow labeled API access goes from Developer classes to android.jar.
On the left, a diagram of a smartphone with the Android logo (a green robot) contains two boxes: Platform classes and APK files.
Platform classes contain the text 'boot.art: framework.jar + 24 .jar = Android SDK classes + Hidden classes'.
APK file is split in two, in the top part: Developer classes + some extra classes, and on the bottom part: Multi DEX.
An arrow labeled API access goes from APK file to Platform classes.
Another arrow goes from Developer environment to APK file.
"
),
caption: [Location of SDK classes during development and at runtime]
) <fig:cl-archisdk>