Android System Properties

Question

Do the following access the same internal set of properties or is there any difference in their semantics?

• java.lang.System.setProperty(String key, String value)

• android.os.SystemProperties.set(String key, String value)

• adb shell setprop 'key' 'value'

For example, after calling:

System.setProperty("myprop", "1");

adb shell getprop myprop returns an empty string.

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Note: SystemProperties is an internal class, not exposed in the SDK, but used by other system classes.

Answer 1

SystemProperties.set() and adb shell setprop are inter-operable: they both alter the same system property value.

However, System.setProperty() is Java and VM specific, and uses different key/value naming convention.