android framework增加新的系统服务

[android]Framework新增系统服务

分类： android 2014-04-24 17:21  638人阅读  评论(0)  收藏  举报

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 DevInfoService
 try {
     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