Andorid attribute settings

Hal (C ++)

Property_get

Property_set

Framework and app (Java)

Systemproperties. Get

Systempropertise. Set

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Systemproperties and settings. System

1 use systemproperties. Get If the attribute name starts with "Ro.", this attribute is regarded as a read-only attribute. Once set, the attribute value cannot be changed.
If the attribute name starts with "Persist.", when this attribute is set, its value will also be written to/data/property. To view the current language settings, type: Getprop persist. SYS. Language
The current language settings are displayed: If you need to set the current language: Setprop persist. SYS. Language ZH Or Setprop persist. SYS. Language en
In C ++, the two functions corresponding to Java are property_set and property_get. In fact, Java calls these two functions through JNI.
The Java code is as follows:

Import Android. OS. systemproperties;

Systemproperties. Set ("Persist. SYS. Language", zone. GETID ());
String lang = systemproperties. Get ("Persist. SYS. Language ");

Method:

Boolean fastfoodenable = systemproperties. getboolean ("Persist. SYS. fastfoodenable", false );

Setting method:

Systemproperties. Set ("Persist. SYS. fastfoodenable", "true ");

The C code is as follows:

# Include <cutils/properties. h>

Property_set ("Persist. SYS. Language", "ZH ");
Property_get ("Persist. SYS. Language", proplang, "en ");

In the ADB shell, you can read and modify the following name:

Setprop persist. SYS. Language ZH Or Setprop persist. SYS. Language en

 

Create and modify Android Properties Using systemproperties. set (name, value) to obtain the android attributes using systemproperties. get (name), note that the name of the android attribute has certain format requirements, as follows: the prefix must be defined in System \ core \ init \ property_service.c, the program that sets System Properties must also have system or root permissions.

If you want to add a property, for example, voice_ctrl

Path: System/CORE/rootdir/int. RC

Under the on post-FS-data directory

Setprop persist. SYS. voice_ctrl 1 // persist. sys prefix name; 1 is the initial value

Different prefix names have different permissions. Why should I load the on post-FS-data directory? This is related to the Int. RC syntax.

 

 

 

2. Use settings. system. putint

In this way, the variables are saved to the settings database, and the flight mode switch is implemented in this way.

First, you need to define a system property value.

Path: frameworks/base/CORE/Java/Android/provider/settings. Java

Public static final string vivien_fastfood = "Hungry ";

1) The method is as follows:

@ Override

Public void onresume ()

{

Super. onresume ();

If (settings. system.Getint(Getcontentresolver (), settings. system. vivien_fastfood, 0) = 1)

{

Myesorno. setchecked (true );

}

Else

Myesorno. setchecked (false );

}
2) settings

If (myesorno. ischecked ()){

Settings. system.Putint(Getcontentresolver (),

Settings. system. vivien_fastfood, 1 );

} Else {

Settings. system.Putint(Getcontentresolver (),

Settings. system.Vivien_fastfood, 0 );

}

 

Import Android. provider. settings;