Android framework开发全局系统属性设置与获取

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SystemProperties.getInt("persist.sys.boot_music_control", 0)

SystemProperties.set("persist.sys.boot_music_control", ""+value);

           char boot_music_control[PROPERTY_VALUE_MAX];
            if (property_get("persist.sys.boot_music_control", boot_music_control, 0) != 0) {
                mediastatus = mediaplayer->setDataSource(pBackupSoundFileName, NULL);
            }

system/core/libcutils/properties.c
 
#define PROPERTY_KEY_MAX   32
#define PROPERTY_VALUE_MAX  92
 
int property_get(const char *key, char*value, const char *default_value);
int property_set(const char *key, constchar *value);
int property_list(void (*propfn)(const char *key, constchar *value, void*cookie), void *cookie);   

#include "cutils/properties.h"
 
char prop[PROPERTY_VALUE_MAX] = "000";
if(property_get("prop_name", prop, NULL) != 0) {
    ...
}

<span style="font-size:14px;">public static final int PROP_NAME_MAX = 31;
public static final int PROP_VALUE_MAX = 91;
public static String get(String key) ；
public static String get(String key, String def) ;
public static int getInt(String key,int def) ;
public static long getLong(String key,long def) ;
public static boolean getBoolean(String key, boolean def) ;
public static void set(String key, String val) ;
public static void addChangeCallback(Runnable callback) ;
</span>

遇到问题解决：

1.在Setting中添加开关使用getProperty（）和setProperty（）属性来进行属性的获取和设置，在命令行使用

adb shell getprop

来查看属性的值：

[persist.service.adb.enable]: []
[persist.sys.ams.recover]: [false]
<span style="color:#FF0000;">[persist.sys.boot_music_control]: [1]</span>
[persist.sys.bootpackage]: [1]
[persist.sys.btn_auto_light]: [1]

<span style="color:#FF0000;">persist.sys.boot_music_control</span>

解决：

                        //Modfy by jjli,control the boot and shutdown music 
			char boot_music_control[PROPERTY_VALUE_MAX];	
			property_get("persist.sys.boot_music_control", boot_music_control, 1);
			int boot_music_value = atoi(boot_music_control);	
			if (boot_music_value == 1) {	
			mediastatus = mediaplayer->setDataSource(pBackupSoundFileName, NULL);

Android framework开发全局系统属性设置与获取,布布扣,bubuko.com

Android framework开发全局系统属性设置与获取

标签：android   style   class   blog   code   java   

原文地址：http://blog.csdn.net/qq435757399/article/details/30270875