Field Operations

In the process of Hooking, besides method calls, we often need to read or modify class fields. This module provides the following four functions for accessing object or class field information:

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1. getField —— Get Instance Field

getField(instance, "fieldName")

Function Description:

• Get member fields in an object instance (including public, private, protected, and other modifiers)

Example:

local activityTitle = getField(activityInstance, "mTitleTextView")

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2. getStaticField —— Get Static Field

getStaticField(class, "fieldName")

Function Description:

• Suitable for accessing class-level static fields

Example:

local sdkInt = getStaticField(Build, "SDK_INT")

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3. setField —— Modify Instance Field

setField(instance, "fieldName", newValue)

Function Description:

• Dynamically set the field value of an object
• Supports modification of private fields

Example:

setField(view, "mPaddingTop", 20)

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4. setStaticField —— Modify Static Field

setStaticField(class, "fieldName", newValue)

Function Description:

• Used to modify the value of static fields

Example:

setStaticField(Builds, "SDK_INT", 99)