App Lock: Fingerprint, Pattern v4.2.3.1
APK · 4.4 MB · version code 4231 · Android 4.0.3+ · uploaded May 17, 2018
- Same certificate as v6232-1r, which matches Google Play Details
Quick check before downloading
Answer this to unlock the download. It keeps automated downloaders away.
Compared with the latest version
The latest version is v6232-1r, uploaded Oct 5, 2026 — about 8 years after this one.
- Size: this file is 4.4 MB; the latest is 34 MB (29.6 MB larger).
- Android: this version needs Android 4.0.3+; the latest needs Android 6.0+. Use this one if your device runs an older Android release.
- The latest version asks for 22 more permissions: Access adservices ad id, Access adservices attribution, Access adservices topics, Camera, Run foreground services, Foreground service special use, Get tasks, Kill background processes….
- The latest version no longer asks for: Approximate location, Precise location, Find accounts on the device, Read shared storage, Read logs, Read phone status and identity, Modify shared storage, Push messaging (app-defined).
File information
- Version
- v4.2.3.1 (4231)
- Uploaded
- May 17, 2018
- Size
- 4.4 MB
- Requires
- Android 4.0.3+ (API 15)
- CPU support
- Any (no native code)
- Screen
- Small screens and larger
- MD5
- cedf5d7ce2a2f97e10914eabf4eaca3d
- Signing certificate (SHA-1)
- BF:0D:CF:32:0A:03:1E:34:AA:E1:F5:BD:66:05:6F:61:6C:3D:EC:BA
- Signed by
- CN=Ali Burak G?nc?, O=MartianMode
- File name
- com-martianmode-applock-4231-37361946-cedf5d7ce2a2f97e10914eabf4eaca3d.apk
- Package
- com.martianmode.applock
- Downloads (all versions)
- 10M+
- Age rating
- PEGI 3 · Everyone
What's new in v4.2.3.1
Fingerprint is working!
Better, Faster, Stronger!
Now with fingerprint support!
Permissions (24)
This version requests 24 permissions, 9 of them sensitive.
- Approximate location Sensitive android.permission.ACCESS_COARSE_LOCATION
- Display over other apps Sensitive android.permission.SYSTEM_ALERT_WINDOW
- Find accounts on the device Sensitive android.permission.GET_ACCOUNTS
- Modify shared storage Sensitive android.permission.WRITE_EXTERNAL_STORAGE
- Package usage stats Sensitive android.permission.PACKAGE_USAGE_STATS
- Precise location Sensitive android.permission.ACCESS_FINE_LOCATION
- Read phone status and identity Sensitive android.permission.READ_PHONE_STATE
- Read shared storage Sensitive android.permission.READ_EXTERNAL_STORAGE
- Write settings Sensitive android.permission.WRITE_SETTINGS
- Add home-screen shortcuts com.android.launcher.permission.INSTALL_SHORTCUT
- Context write use app feature survey (custom) com.samsung.android.providers.context.permission.WRITE_USE_APP_FEATURE_SURVEY
- Control vibration android.permission.VIBRATE
- Firelauncher launch (custom) com.amazon.firelauncher.permission.LAUNCH
- Full network access android.permission.INTERNET
- Google Play install referrer com.google.android.finsky.permission.BIND_GET_INSTALL_REFERRER_SERVICE
- In-app purchases (Google Play Billing) com.android.vending.BILLING
- Prevent the device from sleeping android.permission.WAKE_LOCK
- Push messaging (app-defined) com.martianmode.applock.permission.C2D_MESSAGE
- Read logs android.permission.READ_LOGS
- Receive push notifications com.google.android.c2dm.permission.RECEIVE
- Run at startup android.permission.RECEIVE_BOOT_COMPLETED
- Use fingerprint hardware android.permission.USE_FINGERPRINT
- View Wi-Fi connections android.permission.ACCESS_WIFI_STATE
- View network connections android.permission.ACCESS_NETWORK_STATE
Security & authenticity
Security rating: Trusted
Signing certificate
- Certificate issued to “MartianMode” This is the certificate of the Google Play version.
- Same certificate as v6232-1r, which matches Google Play v6232-1r · v6231-2r · v6230-6r · v6229-1r
Store checks
- Developer signature verified May 17, 2018
- Antivirus scan passed Nov 13, 2020
- Uploaded by “superuser4k” Gold tier · 51,570 followers · uploading since 2017
Scans come from the source store; the certificate comparisons are AAPKs's own, made from the files' published signatures (6 other versions compared). AAPKs doesn't scan files itself.
How to install App Lock: Fingerprint, Pattern on Android 4.0.3+
You'll need about 8.9 MB of free space.
- Download the APK — tap Download APK above (4.4 MB). Chrome shows “File might be harmful” for every APK file; choose Download anyway only if you trust this file.
- Open the file — tap the download notification, or open Files › Downloads and tap com-martianmode-applock-4231-37361946-cedf5d7ce2a2f97e10914eabf4eaca3d.apk.
- Allow the install (first time only) — Android 8 and later asks for permission the first time an app opens an APK: tap Settings in the prompt, turn on Allow from this source, then go back. Manual path: Settings › Apps › Special app access › Install unknown apps (on Samsung: Settings › Apps › ⋮ › Special access). On Android 7 and older: Settings › Security › Unknown sources.
- Check the file (optional) — the MD5 of the downloaded file should be cedf5d7ce2a2f97e10914eabf4eaca3d. If it differs, the file is damaged or was changed: delete it and download again.
- Tap Install — Android asks “Do you want to install this app?”. If Google Play Protect shows a warning, read it before you continue: the source store rated this file Trusted, but only install apps from sources you trust. If an earlier version is installed, this one only installs as an update when it is signed with the same certificate (SHA-1 shown above).
- Open App Lock: Fingerprint, Pattern — tap Open on the install screen, or find it in your app drawer.
Common install problems
- “App not installed” — a version signed with a different certificate, or a newer version, is already installed (Android doesn't allow downgrades). Uninstall it first; back up your data, because uninstalling deletes it.
- “There was a problem parsing the package” — the file is incomplete, or your Android is too old (this version needs Android 4.0.3+). Download it again, or pick an older version.
- Blocked by Play Protect — Play Protect checks apps from outside the Play Store. Only continue if you trust the source.