[移动开发]系统@hide使用分析

调用@hide系统隐藏类

通过反射

public static  String getProperty(String key, String defaultValue) {
    String value = defaultValue;
    try {
        Class<?> c = Class.forName("android.os.SystemProperties");
        Method get = c.getMethod("get", String.class, String.class);
        value = (String)(get.invoke(c, key, "unknown" ));
    } catch (Exception e) {
        e.printStackTrace();
    }finally {
        return value;
    }
}

public static void setProperty(String key, String value) {
    try {
        Class<?> c = Class.forName("android.os.SystemProperties");
        Method set = c.getMethod("set", String.class, String.class);
        set.invoke(c, key, value );
    } catch (Exception e) {
        e.printStackTrace();
    }
}

添加系统framework.jar
目录：out/target/common/obj/JAVA_LIBRARIES/framework_intermediates/classes.jar

框架层系统源码中添加监听

/**{@hide}*/
private VolumeListener listener;

/**{@hide}*/
public void setListener(VolumeListener listener){
	this.listener = listener;
}

/**{@hide}*/
public interface VolumeListener{
	void updateVolume(int type,int index);
}