Android Systemproperties.set doesn't work

Question

I want to add a property cam.sound in framework/base/core/Java/Android/hardware/Camera.Java so that I can use to turn on or turn off the camera shutter sound, but it seems that the Systemproperties.set function doesn't work. Below is my test steps:

• import Android.os.SystemProperties;
• call function whit SystemProperties.set("cam.sound", "on");

After that, the value of cam.sound didn't change.

Answer 1

I think you need prefix name "persist.sys."

And then AndroidManifest.xml add (android:sharedUserId="android.uid.system")

And then Android.mk add (LOCAL_CERTIFICATE :=platform)