上为Android系统的Application Frameworks层增加硬件访问服务"/>
android10 在Ubuntu上为Android系统的Application Frameworks层增加硬件访问服务
学习总纲:
Android10 硬件抽象层(HAL)概要介绍和学习计划
编写环境:
- android 版本 - android-10.0.0_r41- 架构 - aosp_x86_64-eng- 内核分支:android-goldfish-4.14-gchips
参考资源
罗升阳:: ://blog.csdn/zhaojigao/article/details/106487673
修改如下:
修改…/frameworks/base目录下的Android.bp
然后执行 mmm ./frameworks/base/core/java/android/os/
注意:千万不要执行mmm ./frameworks/base,这个命令会将base中的所有文件都编译一遍,会导致一些多余Apk,导致。。。
在/frameworks/base/services/ core /java/com/android/server目录下新建HelloService.java文件 (添加了一些日志)
package com.android.server;
import android.content.Context;
import android.os.IHelloService;
import android.util.Slog;
public class HelloService extends IHelloService.Stub {private static final String TAG = "HelloService";HelloService() {Slog.i(TAG, "init_native");init_native();}public void setVal(int val) {Slog.i(TAG, "setVal =" +val);setVal_native(val);} public int getVal() {Slog.i(TAG, "getVal");return getVal_native();}private static native boolean init_native();private static native void setVal_native(int val);private static native int getVal_native();
};
修改/frameworks/base/services/java/com/android/server/SystemServer.java文件,如下:
import com.android.server.HelloService;traceBeginAndSlog("StartHelloService");
try {ServiceManager.addService("hello", new HelloService());
} catch (Throwable e) {reportWtf("starting HelloService", e);
}
traceEnd();
--------------------------------------------------------------------------------------------------------
添加selinux权限
./system/sepolicy/public/property_contexts
./system/sepolicy/prebuilts/api/28.0/public/property_contexts
./system/sepolicy/prebuilts/api/29.0/public/property_contexts
上面三个文件添加下面内容:
ro.hardware.hello u:object_r:exported_default_prop:s0 exact int
修改service_contexts和service.te文件
./system/sepolicy/private/service_contexts
./system/sepolicy/public/service.te
./system/sepolicy/prebuilts/api/26.0/private/service_contexts
./system/sepolicy/prebuilts/api/26.0/public/service.te
./system/sepolicy/prebuilts/api/27.0/private/service_contexts
./system/sepolicy/prebuilts/api/27.0/public/service.te
./system/sepolicy/prebuilts/api/28.0/private/service_contexts
./system/sepolicy/prebuilts/api/28.0/public/service.te
./system/sepolicy/prebuilts/api/29.0/private/service_contexts
./system/sepolicy/prebuilts/api/29.0/public/service.te
所有的 service_contexts文件添加一行
hello u:object_r:hello_service:s0
所有的 service.te文件添加一行
type hello_service, app_api_service, ephemeral_app_api_service, system_server_service, service_manager_type;
mmm frameworks/base/services/core/java
make snod
make -j8
启动成功:
问题记录:
AndroidRuntime: java.lang.IllegalStateException: Signature|privileged permissions not in privapp-permissions whitelist: {com.android.systemui: android.permission.MANAGE_DEBUGGING, com.android.systemui: android.permission.CONTROL_VPN, com.android.systemui: android.permission.START_TASKS_FROM_RECENTS, com.android.systemui: android.permission.STATUS_BAR, com.android.systemui: android.permission.GET_APP_OPS_STATS, com.android.systemui: android.permission.CONTROL_KEYGUARD_SECURE_NOTIFICATIONS, com.android.systemui: android.permission.MOUNT_UNMOUNT_FILESYSTEMS, com.android.statsd.dogfood: android.permission.DUMP, com.android.systemui: android.permission.USE_RESERVED_DISK, com.android.systemui: android.permission.CONNECTIVITY_INTERNAL, com.android.systemui: android.permission.CONTROL_REMOTE_APP_TRANSITION_ANIMATIONS, com.android.systemui: android.permission.WRITE_MEDIA_STORAGE, com.android.systemui: android.permission.CONTROL_DISPLAY_COLOR_TRANSFORMS, com.android.systemui: android.permission.READ_DREAM_STATE, com.android.systemui: android.permission.CHANGE_COMPONENT_ENABLED_STATE, com.android.systemui: android.permission.MODIFY_PHONE_STATE, com.android.systemui: android.permission.CHANGE_OVERLAY_PACKAGES, com.android.systemui: android.permission.MEDIA_CONTENT_CONTROL, com.android.systemui: android.permission.STOP_APP_SWITCHES, com.android.systemui: android.permission.TETHER_PRIVILEGED, com.android.systemui: android.permission.WRITE_EMBEDDED_SUBSCRIPTIONS, com.android.hardware.usb.externalmanagementtest: android.permission.MANAGE_USB, com.android.systemui: android.permission.MASTER_CLEAR, com.android.systemui: android.permission.BLUETOOTH_PRIVILEGED, com.android.systemui: android.permission.RECEIVE_MEDIA_RESOURCE_USAGE, com.android.systemui: android.permission.BATTERY_STATS, com.android.systemui: android.permission.MANAGE_USB, com.android.systemui: android.permission.REAL_GET_TASKS, com.android.systemui: android.permission.CHANGE_DEVICE_IDLE_TEMP_WHITELIST, com.android.statsd.loadtest: android.permission.DUMP, com.android.systemui: android.permission.WATCH_APPOPS, com.android.test.soundtrigger: android.permission.MANAGE_SOUND_TRIGGER, com.android.systemui: android.permission.WRITE_DREAM_STATE, com.android.systemui: android.permission.SUBSTITUTE_NOTIFICATION_APP_NAME, com.android.test.voiceenrollment: android.permission.MANAGE_VOICE_KEYPHRASES, com.android.test.soundtrigger: android.permission.CAPTURE_AUDIO_HOTWORD, com.android.systemui: android.permission.OVERRIDE_WIFI_CONFIG, com.android.systemui: android.permission.WRITE_SECURE_SETTINGS, com.android.systemui: android.permission.MANAGE_USERS, com.android.systemui: android.permission.READ_PRIVILEGED_PHONE_STATE, com.android.systemui: android.permission.READ_NETWORK_USAGE_HISTORY, com.android.systemui: android.permission.START_ACTIVITIES_FROM_BACKGROUND, com.android.systemui: android.permission.MODIFY_DAY_NIGHT_MODE, com.android.systemui: android.permission.DUMP, com.android.systemui: android.permission.UPDATE_APP_OPS_STATS, com.android.systemui: android.permission.INTERACT_ACROSS_USERS}
异常原因: 使用了 mmm ./frameworks/base 导致编译了多于的Apk.
解决方法:
方法1:
可参照本篇红色字体。
方法2:
将异常缺损权限添加到./frameworks/base/data/etc/privapp-permissions-platform.xml中
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android10 在Ubuntu上为Android系统的Application Frameworks层增加硬件访问服务
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