Hand store installs before falling back to a session - #941
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…session A PackageInstaller session committed by the manager never reaches a third-party installer: parasitically the commit is a silent install by com.android.shell that nothing observes, and standalone it pins the platform's own confirmation UI. From API 29 the download is instead staged into MediaStore.Downloads — pending until complete — checked against the catalogue entry's package name, and handed over with one plain ACTION_VIEW intent. Whoever answers is the user's answer: their chosen default, a resolver pick, or the platform's own — which InstallerX Revived and its kind can finally see and intercept. The verdict comes back as the package event for the target package, armed before the intent fires so that one arriving early is buffered rather than missed. A five-minute timeout leaves the staged copy for an installer still showing its prompt; staging that fails or is cancelled withdraws its entry, as the session route abandons its session. A staged APK declaring another package is never handed off — the session route takes it and the platform fails it under its own name. Before Q, or when the intent could not be fired at all, the session route applies unchanged. Vector's own dialog remains the gate that names what is about to be downloaded, whichever route runs.
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To allow third-party installers (like InstallerX Revived) to handle app installations instead of the system's default UI or shell:
Downloaded APKs are staged in MediaStore.Downloads (marked pending).
After package name verification, the app fires a standard ACTION_VIEW intent rather than a direct PackageInstaller session.
Package events are pre-registered to buffer early verdicts.
Fallbacks & Safeguards:
Timeouts: A 5-minute window is given for the installer to process the staged file.
Validation: Mismatched package names bypass the intent and fall back to the native session route.
Legacy Support: Android versions below Q (API 29) or failed intent resolutions automatically fall back to the standard session mechanism.