Android INJECT_EVENTS permission

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To inject events into a separate process, it is required to both install your app into /system/app and sign your APK with the system certificate.

1. Add permission to the app manifest

<uses-permission android:name="android.permission.INJECT_EVENTS"/>

2. Sign your APK with the system certificate

This requires that you have the AOSP source in order to build a keystore with the google keys used to build the system running on the phone.

Given you have an AOSP directory, @Eli does an excellent job of showing how to build the keystore using a nice script called ‘keytool-importkeypair’

Using IntelliJ as an example, choose Generate Signed APK.. from the Build menu. Locate the keystore created above, type in the password given (e.g., android), give the key the same password, if desired. Note that the signed apk is written to the project root (!) not to the typical location (./out/production//).

3. Install into /system/app/

adb root
adb remount
adb push MyApp.apk /system/app

The ‘installation’ happens automatically. Note, however, that unlike the normal app installation process, any native libraries in your APK are not copied into /system/lib/. You will need to do that manually, if you are using the NDK to build and call your own native libraries.

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