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Tv Input Framework (TIF) documentaition says:

Only system TV Inputs are eligible to receive InputEvents, and only if they have the RECEIVE_INPUT_EVENT system permission. The TV Input is responsible to determine which InputEvents to consume and should allow the TV App to handle the keys it does not need to consume.

This RECEIVE_INPUT_EVENT seems to be a system permission. Trying to enable it via adb fails:

$ adb shell pm grant com.example.mytvinput \
  com.android.tv.permission.RECEIVE_INPUT_EVENT

Operation not allowed: java.lang.SecurityException: Permission 
com.android.tv.permission.RECEIVE_INPUT_EVENT is not a changeable permission type

Android Open Source Project (AOSP) sources indicate that RECEIVE_INPUT_EVENT permission is signatureOrSystem type, which in turn is defined by Android Permission documentation as:

A permission that the system grants only to applications that are in the Android system image or that are signed with the same certificate as the application that declared the permission.

How to develop an overlay to Android Tv Input Service that is consuming input (e.g. HbbTv)?

Do I have to compile the developed Tv Input into an android image in order to develop it?

mkrasowski
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1 Answers1

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You should install your application in /system/priv-app.

/system/priv-app is a special place for applications wanting more permissions than others .

Step-by-step

To start an emulator with writable system partition, you should use -writable-system flag.

./emulator -writable-system -avd Oreo_Android_TV_1080p_API_26

Next remount /system partition with

adb root
adb remount

Next move your application to /system/priv-app and reboot

adb shell mv /data/app/com.example.myinput /system/priv-app/com.example.myinput

Sources

Android Emulator Command Line doc, explaining -writable-service flag

What is the difference between system apps and privileged apps on Android?

mkrasowski
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