Precautions for SystemProperies

When SystemProperties is used, the system restarts constantly after it is started. Check the log filter function found by system android.

E/AndroidRuntime (14952): at android. OS. SystemProperties. get (SystemProperties. java: 64)

View the Framework source code SystemProperties. java: 64 and locate the following position:

/**

* Get the value for the given key.

* @ Return if the key isn't found, return def if it isn't null, or an empty string otherwise

* @ Throws IllegalArgumentException if the key exceeds 32 characters

*/

Public static String get (String key, String def ){

If (key. length ()> PROP_NAME_MAX ){

Throw new IllegalArgumentException ("key. length>" + PROP_NAME_MAX );

}

Return native_get (key, def );

}

The original SystemProperties key length cannot exceed 30 bytes. Solved since then