• 添加Java服务

    文章目录

    1. 定义接口

    定义aidl接口

    //frameworks/base/core/java/android/hello/IHelloService.aidl
package android.hello;
interface IHelloService {
    void hello(String name);
}

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    frameworks/base/Android.bp framework-defaults 模块中添加我们刚刚加的 aidl 文件 "core/java/android/pure/IHelloService.aidl"

    mm成功，会有hello目录IHelloService.java

    2 实现接口

    //frameworks/base/services/core/java/com/android/server
package com.android.server;

import android.hello.IHelloService;
import android.util.Log;

public class HelloService extends IHelloService.Stub {
    private final String TAG = "HelloService";

    public HelloService() {
        Log.d(TAG, "create hello service");
    }

    @Override
    public void hello(String name) {
        Log.d(TAG, "hello " + name);
    }
}

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    3 添加到ServiceManager

    // frameworks/base/services/java/com/android/server/SystemServer.java  startOtherServices 
// add hello service
traceBeginAndSlog("HelloService");
ServiceManager.addService("HelloService", new HelloService());
traceEnd();

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    编译运行，系统起不来，错误log

    12-20 23:46:47.308  1526  1526 E SELinux : avc:  denied  { add } for service=HelloService pid=3521 uid=1000 scontext=u:r:system_server:s0 tcontext=u:object_r:default_android_service:s0 tclass=service_manager permissive=0

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    没有添加SELinux规则

    4 selinux规则

    android 10的selinux在sysem/sepolicy,每个版本不尽相同。参考network_time_update_service

    cd system/sepolicy
grep -nr network_time_update_service

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    找到所有service.te 和service_context,参考network_time_update_service加上HelloService配置

    service_context 加上

    HelloService u:object_r:HelloService:s0

    service.te加上

    type HelloService, system_server_service, service_manager_type;

    5 验证

    整编后 service list 发现

    HelloService:[andorid.hello.IHelloService]

    6 客户端使用

    6.1 系统源码中使用

    Android.bp

    android_app {
	src: ["src/**/*.java"],
	resource_dirs: ["res"],
	certificate: "platform",
	platform_apis: true,
}

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    platform_apis 要设置为true，不然没法调用系统服务

    public class MainActivity extends Activity {

    private static final String TAG = "PureSettings";
    private IHelloService service = null;
    private Button button;

    private void test() {
        Log.d(TAG, "test");
        try {
            service.hello("hello");
        } catch (RemoteException e) {
            e.printStackTrace();
        }
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        service = IHelloService.Stub.asInterface(ServiceManager.getService("HelloService"));

        button = (Button) findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                test();
            }
        });
    }
}

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    将模块添加到系统

    pure.mk

    PRODUCT_PACKAGES += PureSettings

    编译运行，闪退，错误日志

    E SELinux : avc: denied { find } for service=HelloService pid=4266 uid=10102 scontext=u:r:platform_app:s0:c512,c768 tcontext=u:object_r:HelloService:s0 tclass=service_manager permissive=0

    看起来还是有selinux权限需要添加，具体分析如下

    • 缺少什么权限 {find}
    • 谁缺少权限 scontext=u:r:platform_app:s0:c512,c768
    • 对哪个文件缺少权限： tcontext=u:object_r:HelloService:s0
    • 什么类型的文件： tclass=service_manager
    • 完整的意思： platform_app 缺少 service_manager 类型的 HelloService 的 find 权限。
    • 在 platform_app.te 中添加 HelloService 的 find 权限即可

    alllo platform_app HelloService:service_manager find;,找到所有private/platform_app.te 都加上，

    重新编译运行就正常。

    6.2 非系统源码使用

    实际项目中，非系统源码使用系统服务，需要封装一层接口出来。apk –> HelloApi –> HelloService
    我们按以下目录结构创建 HelloApi 模块：

    qiushao@qiushao-pc:~/source/android-10/device/qiushao/pure/models$ tree HelloApi/
HelloApi/
├── Android.bp
└── java
    └── com
        └── pure  
            └── api
                └── HelloManager.java

4 directories, 2 files
qiushao@qiushao-pc:~/source/android-10/device/qiushao/pure/models$

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    Android.bp

    java_library {
    name: "com.pure.api",
    installable: true,
    srcs: [
        "java/**/*.java", //文件列表
    ],
}

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    //device/qiushao/pure/models
import android.os.RemoteException;
import android.os.ServiceManager;
import android.pure.IHelloService;

public class HelloManager {

    private static HelloManager mInstance = null;
    public static HelloManager getInstance() {
        if (null == mInstance) {
            mInstance = new HelloManager();
        }
        return mInstance;
    }

    private IHelloService mService = null;
    private HelloManager() {
        mService = IHelloService.Stub.asInterface(ServiceManager.getService("HelloService"));
    }

    public void sayHello(String name) {
        try {
            mService.hello(name);
        } catch (RemoteException e) {
            e.printStackTrace();
        }
    }
}

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    HelloApi 目录 mm 编译模块，得到 out/target/common/obj/JAVA_LIBRARIES/com.pure.api_intermediates/classes.jar 文件
    生成class.har, 复制到as创建的项目中，add as library， 然后我们就可以在 apk 的代码中使用 com.pure.api.jar 的接口了：

    ...
public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        HelloManager.getInstance().sayHello("qiushao");
    }
}

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    编译运行，又有错误

    E SELinux : avc: denied { find } for service=HelloService pid=4266 uid=10102 scontext=u:r:untrusted_app:s0:c512,c768 tcontext=u:object_r:HelloService:s0 tclass=service_manager permissive=0

    alllow untrusted_app HelloService:service_manager find;

    7 添加回调

    //frameworks/base/core/java/android/hello
package android.pure;
interface ICallback {
    void onMessage(in String message);
}

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    frameworks/base/Android.bp framework-defaults 模块中添加aidl文件

    "core/java/android/hello/ICallback.aidl",,会生成ICallback.java文件

    8 添加注册回调

    修改 IHelloService.aidl

    package android.hello;
import android.pure.ICallback;
interface IHelloService {
    void hello(in String name);
    void registerCallback(in int pid, in ICallback callback);
    void unregisterCallback(in int pid);
}

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    HelloService.java 修改如下：

    package com.android.server;

import android.os.RemoteException;
import android.pure.IHelloService;
import android.pure.ICallback;
import android.util.Log;

import java.util.HashMap;
import java.util.Map;

public class HelloService extends IHelloService.Stub {
    private final String TAG = "HelloService";
    private Map<Integer, ICallback> mClients;

    public HelloService() {
        Log.d(TAG, "create hello service");
        mClients = new HashMap<>();
    }

    @Override
    public void hello(String name) {
        Log.d(TAG, "hello " + name);
        try {
            for (ICallback callback : mClients.values()) {
                callback.onMessage("message from service");
            }
        } catch (RemoteException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void registerCallback(int pid, ICallback callback) {
        mClients.put(pid, callback);
        Log.d(TAG, "registerCallback client's size = " + mClients.size());
    }

    @Override
    public void unregisterCallback(int pid) {
        mClients.remove(pid);
        Log.d(TAG, "unregisterCallback client's size = " + mClients.size());
    }
}

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    9 注册回调接口

    //MainActivity
public class MainActivity extends Activity {

    private static final String TAG = "PureSettings";
    private IHelloService service = null;

    private Button button;

    private ICallback callback = new ICallback.Stub() {

        @Override
        public void onMessage(String message) throws RemoteException {
            Log.d(TAG, "onMessage:" + message);
        }
    };

    private void test() {
        Log.d(TAG, "test");
        try {
            service.hello("qiushao");
        } catch (RemoteException e) {
            e.printStackTrace();
        }
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        service = IHelloService.Stub.asInterface(ServiceManager.getService("HelloService"));
        button = (Button) findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                test();
            }
        });
    }

    @Override
    protected void onResume() {
        super.onResume();
        try {
            service.registerCallback(android.os.Process.myPid(), callback);
        } catch (RemoteException e) {
            e.printStackTrace();
        }
    }

    @Override
    protected void onStop() {
        super.onStop();
        try {
            service.unregisterCallback(android.os.Process.myPid());
        } catch (RemoteException e) {
            e.printStackTrace();
        }
    }
}

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    编译运行成功

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  • 原文地址：https://blog.csdn.net/gangjindianzi/article/details/127680851