Location in AOSP: frameworks/base/services/core/java/com/android/server/usage and frameworks/base/core/java/android/app/usage
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: AOSP is hundreds of gigabytes; Xref tools let you find answers without a full Trace Framework Logic : Essential for understanding how high-level APIs (like ) interact with lower-level native services. Code Reviews Enter xref — a fast, symbol-aware cross-reference tool
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