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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteA runtime resource overlay (RRO) changes selected resource values in a target Android package without changing its code. To build one, declare the target package in the overlay manifest, map the target’s existing resources, install the overlay where the device permits, then enable and verify it for the intended Android user. Android version, target-app policy, signing, and OEM configuration determine which overlays are allowed.
What an RRO can—and cannot—change
The Android Open Source Project defines a runtime resource overlay as “a package that changes the resource values of a target package at runtime.” An overlay can replace values for resources that already exist in the target, such as a color or string. It does not replace app code, add arbitrary behavior, or contain DEX code. AOSP’s RRO documentation describes the mechanism and its constraints.
An RRO is not automatically usable against any installed app. The target package must be correct, and the target’s overlayable-resource policy, overlay signing or preinstallation, Android release, and device-maker configuration can all limit what will work.
Choose the mapping method for the Android version
| Target Android version | How resources are matched | Important consideration |
|---|---|---|
| Android 11 and later | Map target resources in an XML file under the overlay package’s res/xml directory, then reference it with android:resourcesMap on the manifest’s <overlay> element. |
Confirm the mapping file is correctly referenced and each mapped target resource exists. |
| Android 10 and earlier | Resources are matched by name. | Target and overlay share resource ID space; references to the overlay’s own resources can collide. |
These are the AOSP-documented mapping approaches; use the target device’s Android version rather than assuming every device runs the latest release.
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Check whether the target allows the overlay
On Android 10 and later, a target app can expose eligible resources in named <overlayable> groups and attach policies to them. If it declares such a group, the overlay must specify that group with android:targetName, and it can replace only resources exposed there under the applicable policy. If the target declares no overlayable group, AOSP requires the overlay to be preinstalled in the system image or signed with the same signature as the target. A well-formed APK alone does not bypass these rules.
In the overlay manifest, set android:targetPackage to the exact target package name and set the overlay application’s android:hasCode attribute to false. For Android 11 and later, also point the <overlay> element’s android:resourcesMap attribute to the XML map. If the target declares an overlayable group, provide the matching android:targetName.
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Install, enable, and verify the overlay
The Android Automotive documentation demonstrates installing an RRO APK with adb install for its platform-development workflow. That is useful for iteration in that context, but it is not a guarantee that a retail device or every OEM build will accept a sideloaded overlay. System-image installation paths are also documented for Automotive development. See the Android Automotive RRO appendix for that platform-specific workflow.
- Install the APK using a method supported by the device and build. For the documented Automotive development workflow, the command is
adb install path/to/overlay.apk. - List overlays for the intended user:
adb shell cmd overlay list --user current. Replacecurrentwith the intended user if needed. - Enable the installed overlay for that user:
adb shell cmd overlay enable --user current com.example.carrro. Replacecom.example.carrrowith the overlay package name. - Run the list command again and check its state for the target package. AOSP’s troubleshooting guide uses
[ ]for installed and ready to activate,[X]for installed and activated, and---for an installed overlay with errors.
User scope matters: the system user that owns System UI may differ from the foreground user running ordinary apps. On a multi-user device, choose the user whose app you intend to customize and inspect that user’s overlay state. AOSP’s RRO troubleshooting guide explains overlay-state inspection.
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Understand dynamic and static overlays
Dynamic overlays are disabled by default; static overlays are enabled by default, subject to documented exceptions. A mutable overlay can be controlled through the OverlayManager API by its target package or by a package with android.permission.CHANGE_OVERLAY_PACKAGES. Applying an overlay change can send configuration changes to the target and relaunch its activities.
Static overlay priority and ordering depend on Android release and device configuration. Do not assume one universal precedence rule: inspect the actual overlay state and resource mapping on the target device when multiple overlays could affect the same resource.
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Troubleshoot an overlay that does not apply
- Check package names. Verify that the manifest’s
android:targetPackageidentifies the intended target and that you use the overlay APK’s actual package name in shell commands. - Check target policy. If the target declares overlayable resources, confirm the overlay’s
android:targetNamematches a declared group and that the requested resources are exposed under a policy the overlay satisfies. If there is no overlayable declaration, check the AOSP signing or system-image preinstallation requirement. - Check the mapping. On Android 11 and later, verify the
res/xmlmap exists, the manifest references it throughandroid:resourcesMap, and the mapped target resource exists. On Android 10 and earlier, check resource names and possible resource-ID collisions. - Check installation, state, and user. Run
adb shell cmd overlay list --user currentfor the user that owns the app. If the overlay is absent beneath its target, confirm installation and the target package name. An installed overlay shown with errors is not ready to apply. - Inspect idmap diagnostics. Look for
idmaperrors in device logs. AOSP documentsadb shell idmap2 dump --idmap-path [file]to inspect generated target-to-overlay mappings under/data/resource-cache/. Use the path to the relevant idmap file on the device.
For more diagnostic context, consult AOSP’s troubleshooting guidance, which covers manifest, configuration, target availability, and idmap problems.
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