[android]Framework新增系统服务

在android源码中增加一项系统服务，如在android.app包下增加DevInfoManager.java，按如下进行处理：

1、在frameworks/base/core/java/android/app/目录下增加DevInfoManager.java及IDevInfoManager.aidl文件

DevInfoManager.java如下：

package android.app;import android.os.Handler;import android.os.RemoteException;import android.util.Log;public class DevInfoManager{        public static final String TAG = "DevInfoManager";        IDevInfoManager mService;        Handler mHandler;        public DevInfoManager(IDevInfoManager service, Handler handler) {                mService = service;                mHandler = handler;        }        public String getValue(String name){            try {                return mService.getValue(name);            } catch (RemoteException e) {                Log.e(TAG, "[getValue] RemoteException");            }            return null;        }        public int update(String name, String value, int attribute) {            try {                return mService.update(name, value, attribute);            } catch (RemoteException e) {                Log.e(TAG, "[update] RemoteException");            }            return -1;        }}

IDevInfoManager.aidl文件如下：

package android.app;interface IDevInfoManager{    String getValue(String name);    int update(String name, String value, int attribute);}

2、添加相应的Service类，在frameworks/base/services/java/com/android/server下增加DevInfoService.java文件

DevInfoService.java文件如下：

package com.android.server;import android.app.IDevInfoManager;import android.util.Log;import android.content.Context;public class DevInfoService extends IDevInfoManager.Stub{    private static final String TAG = "DevInfoManagerService";    private Context mContext;    public DevInfoService(Context context){        mContext = context;    }    public String getValue(String name) {        Log.d(TAG,"[getValue] name : "+name);        return name;    }    public int update(String name, String value, int attribute) {        Log.d(TAG,"[update] name : "+name +", value : "+value+", attribute : "+attribute);        return 0;    }}

3、在SystemServer中生成该Service并添加到ServiceManager中

frameworks/base/services/java/com/android/server/SystemServer.java文件：

// add DevInfoServicetry {    Slog.i(TAG, "DevInfoManager Service");    devInfo =  new DevInfoService(context);    ServiceManager.addService(Context.DEVINFO_SERVICE, devInfo);} catch (Throwable e) {    reportWtf("starting devInfo Service", e);}// end

4、在frameworks/base/core/java/android/app/ContextImpl.java中增加service注册，如下：

registerService(DEVINFO_SERVICE, new ServiceFetcher() {        public Object createService(ContextImpl ctx) {                IBinder b = ServiceManager.getService(DEVINFO_SERVICE);                IDevInfoManager service = IDevInfoManager.Stub.asInterface(b);                return new DevInfoManager(service, ctx.mMainThread.getHandler());        }});

5、在frameworks/base/core/java/android/content/Context.java中增加Service名称定义：

/** * Use with {@link #getSystemService} to retrieve a {@link * android.app.DevInfoManager} for handling management of * device information access. * * @see #getSystemService * @see android.app.DevInfoManager */public static final String DEVINFO_SERVICE = "devinfo";

6、在frameworks/base/Android.mk文件中的LOCAL_SRC_FILES增加aidl的声明：

@@ -112,6 +112,7 @@ LOCAL_SRC_FILES += \

core/java/android/app/backup/IFullBackupRestoreObserver.aidl \

core/java/android/app/backup/IRestoreObserver.aidl \

core/java/android/app/backup/IRestoreSession.aidl \

+ core/java/android/app/IDevInfoManager.aidl \

core/java/android/bluetooth/IBluetooth.aidl \

core/java/android/bluetooth/IBluetoothA2dp.aidl \

7、进行编译，因为framework有变更，需要先update-api，在源码根目录下执行“make update-api”进行更新，完成后“make -j16”进行整体编译

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