Android11.0Frameworks中添加一个自定义系统服务，并提供jar包供应用开发调用

原创已于 2023-11-17 11:42:22 修改 · 2k 阅读

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于 2023-11-17 11:35:11 首次发布

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本文详细介绍了如何在Android11的Frameworks中添加自定义系统服务，包括创建Java和AIDL文件、编译注意事项、添加服务接口、SELinux权限设置以及如何提供jar包供第三方应用调用。最后展示了如何在应用中集成SDKManager来使用新服务。

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Android11.0Frameworks中添加一个自定义系统服务，并提供jar包供应用开发调用

Android11.0Frameworks中添加一个系统服务
- 添加自定义服务
- 封装自定义服务，提供jar供第三方应用开发者调用

Android11.0Frameworks中添加一个系统服务

本文描述Android11中在frameworks中添加一个新的服务, 并封装后提供jar包，供应用开发调用。

添加自定义服务

注意事项：
a.Android11中frameworks编译使用 make framework-minus-apex
b.在framework/base/core目录下添加文件java和aidl文件后，编译时需要先make update-api去更新current.txt文件，然后才能完整编译android，但Android 11 以后谷歌强制开启lint检查，lint检查不过编译会报错，可以让lint检查忽略掉自己的模块在framework/base下的Android.bp忽略掉代码检查，或者可以添加@hide 避免报错:

metalava_framework_docs_args = "
"--api-lint-ignore-prefix com.yjz.test. " //其中 com.yjz.test是包名的前缀。

c.Android11如果编译报如下错误，可以在/build/make/core/tasks/check_boot_jars/package_allowed_list.txt中添加白名单

Error: out/target/common/obj/JAVA_LIBRARIES/framework-minus-apex_intermediates/classes.jar contains class file com/yjz/test/api/ITestManager.class, whose package name com.yjz.test.api is empty or not in the allow list build/make/core/tasks/check_boot_jars/package_allowed_list.txt of packages allowed on the bootclasspath.

###################################################
# framework.jar
javax\.microedition\.khronos\.opengles
javax\.microedition\.khronos\.egl
com\.yjz\.test            //添加
com\.yjz\.test\..*        //添加

定义服务名称，修改路径：/frameworks/base/core/java/android/content/Context.java；


    //这里添加YJZ_TEST_SERVICE
    @StringDef(suffix = { "_SERVICE" }, value = {
      YJZ_TEST_SERVICE, 
    }

     /**
     * Use with {@link #getSystemService(String)} to retrieve a
     * {@link com.yjz.test.TestManager} for yjz_testcontrol.
     *
     * @hide
     * @see #getSystemService(String)
     * @see com.yjz.test.TestManager
     */
    public static final String YJZ_TEST_SERVICE = "yjz_test";

添加ITestManager.aidl及TestManager.java

frameworks/base/core/com/yjz/test/api/ITestManager.aidl


package com.yjz.test.api;

/**
* @hide
*/
interface ITestManager {
     boolean test();
}

frameworks/base/core/com/yjz/test/TestManager.java

/**
 * @hide
 */
@SystemService(Context.YJZ_TEST_SERVICE)
public class TestManager{
    private final Context mContext;
    private final ITestManager mService;
    
    public TestManager(Context context, ITestManager manager) {
        this.mContext = context;
        this.mService = manager;
    }

    public boolean test() {
        try {
            return mService.test();
        } catch (RemoteException e) {
            e.printStackTrace();
        }
        return false;
    }
}

添加TestManagerService /frameworks/base/services/core/java/com/android/server/yjz/TestManagerService.java；


package com.android.server.yjz;

import android.annotation.NonNull;
import android.annotation.SuppressLint;
import android.content.Context;
import android.content.Intent;
import android.net.StaticIpConfiguration;
import android.os.Message;
import android.os.RemoteException;
import android.util.Log;
import com.android.server.SystemService;
import com.yjz.test.api.ITestManager;

public class TestManagerService extends ITestManager.Stub {
    private static final String TAG = "TestManagerService";
    private final Context mContext;

    public TestManagerService(Context context) {
        mContext = context;
    }

    @Override
    public boolean test() throws RemoteException {
        return true;
    }

    public void onStart() {
    }

    public void systemReady() {
        Log.d(TAG, "systemReady--->" + Thread.currentThread().getName());
    }

    public static final class Lifecycle extends SystemService {
        private TestManagerService mServer;

        public Lifecycle(Context context) {
            super(context);
        }

        @Override
        public void onStart() {
            mServer = new TestManagerService(getContext());
            publishBinderService(Context.YJZ_TEST_SERVICE, mServer);
            mServer.onStart();
        }

        @Override
        public void onBootPhase(int phase) {
            if (phase == SystemService.PHASE_ACTIVITY_MANAGER_READY) {
                mServer.systemReady();
            }
        }
    }
}

添加TestManagerService服务到ServiceManager /frameworks/base/services/java/com/android/server/SystemServer.java；


//********省略代码******

import com.android.server.yjz.TestManagerService;

private void startOtherServices(@NonNull TimingsTraceAndSlog t){
            //********省略代码******

            t.traceBegin("StartTestManagerService ");
            mSystemServiceManager.startService(TestManagerService.Lifecycle.class);
            t.traceEnd();

            t.traceBegin("StartTwilightService");
            //********省略代码******
}

//********省略代码******

注册服务 /frameworks/base/core/java/android/app/SystemServiceRegistry.java；

//********省略代码******
import com.yjz.test.TestManager;
import com.yjz.test.api.ITestManager;

static {
//********省略代码******
        registerService(Context.YJZ_TEST_SERVICE, TestManager.class,
                new CachedServiceFetcher<TestManager>() {
                    @Override
                    public TestManager createService(ContextImpl ctx)
                            throws ServiceNotFoundException {
                        IBinder b = ServiceManager.getServiceOrThrow(Context.YJZ_TEST_SERVICE);
                        return new TestManager(ctx, ITestManager.Stub.asInterface(b));
                    }
                }); 

//********省略代码******
}

添加SELinux权限： system/sepolicy/private/service_contexts
system/sepolicy/prebuilts/api/30.0/private/service_contexts
在上面两个文件中添加以下

yjz_test                                  u:object_r:yjz_test_service:s0

/system/sepolicy/public/service.te
/system/sepolicy/prebuilts/api/30.0/public/service.te
在上面两个文件中添加以下

type yjz_test_service, app_api_service, ephemeral_app_api_service, system_server_service, service_manager_type;

system/sepolicy/private/compat/29.0/29.0.ignore.cil
system/sepolicy/private/compat/27.0/27.0.ignore.cil
system/sepolicy/private/compat/28.0/28.0.ignore.cil
system/sepolicy/private/compat/26.0/26.0.ignore.cil
system/sepolicy/prebuilts/api/30.0/private/compat/29.0/29.0.ignore.cil
system/sepolicy/prebuilts/api/30.0/private/compat/27.0/27.0.ignore.cil
system/sepolicy/prebuilts/api/30.0/private/compat/28.0/28.0.ignore.cil
system/sepolicy/prebuilts/api/30.0/private/compat/26.0/26.0.ignore.cil
在上面的文件中添加以下

(typeattributeset new_objects
  ( new_objects
    //********省略代码******
    hypervisor_prop
    yjz_test_service //添加服务名称
  ))

添加白名单：
//build/make/core/tasks/check_boot_jars/package_allowed_list.txt

###################################################
# framework.jar
javax\.microedition\.khronos\.opengles
javax\.microedition\.khronos\.egl
com\.yjz\.test          //新添加
com\.yjz\.test\..*       //新添加

添加隐藏方法允许应用层调用名单
/frameworks/base/config/hiddenapi-greylist-packages.txt

com.yjz.test

编译刷机验证，adb shell service list

封装自定义服务，提供jar供第三方应用开发者调用

在vendor目录下添加yjz目录：

/vendor/yjz/Android.bp

java_library_static {
    name: "yjz-sdk-api",
    srcs: ["com/yjz/**/*.java"],
}

/vendor/yjz/com/yjz/sdk/SDKManager.java

package com.yjz.sdk;

import android.content.Context;
import com.yjz.test.TestManager;

public class SDKManager {
    private static final String TAG = "SDKManager";

    private final Context mContext;

    private TestManager mTestManager;

    public SDKManager(Context context) {
        mContext = context.getApplicationContext();
        mTestManager = (TestManager) context.getSystemService(Context.YJZ_TEST_SERVICE);
    }

    public boolean test() {
        return mTestManager.test();
    }

}

编译 mmm vendor/yjz/ 生成yjz-sdk-api.jar
应用开发时导入yjz-sdk-api.jar，并调用方法

   SDKManager manger = new SDKManager(this);
   manger.test();