Android framwork service添加(manager 远程调service，service jni调native code)

在平常android应用开发中，多数只是调framwork中的API进行application layer的coding，而在系统开发中可能会自己添加系统服务；
系统服务如任何添加，服务如何调native code，以及service如何被manager调用...这里我给出一个结果验证的demo。

1、实现编写native code，framwork/base/services/jni/com_android_server_VirtualInputService.cpp;

   以下是会使用到的native 函数，以及register_android_server_VirtualInputService；具体实现就不在详讲了。

[java]  view plain  copy

 print ?

1. static JNINativeMethod method_table[] = {  
2.     {"native_open",             "()I",(void *)android_server_VirtualInputService_open},  
3.     {"native_close",            "()Z",  (void *)android_server_VirtualInputService_close},  
4.     {"native_sendir",       "(II)Z",  (void *)android_server_VirtualInputService_sendir},  
5. };  
6.      
7. +int register_android_server_VirtualInputService(JNIEnv *env)  
8. +{  
9. +    jclass clazz = env->FindClass("com/android/server/VirtualInputService");  
10. +    if (clazz == NULL) {  
11. +        ALOGE("Can't find com/android/server/VirtualInputService");  
12. +        return -1;  
13. +    }  
14. +     
15. +    return jniRegisterNativeMethods(env, "com/android/server/VirtualInputService",  
16. +            method_table, NELEM(method_table));  
17. +}  
18. +};  

2、base/services/jni/onload.cpp中添加register_android_server_VirtualInputService

[java]  view plain  copy

 print ?

1.  int register_android_server_SerialService(JNIEnv* env);  
2. +int register_android_server_VirtualInputService(JNIEnv* env);  
3.  int register_android_server_UsbDeviceManager(JNIEnv* env);  
4.    
5.       register_android_server_SerialService(env);  
6. +   register_android_server_VirtualInputService(env);  
7.      register_android_server_InputApplicationHandle(env);  

3、mk中添加com_android_server_VirtualInputService，使其被编译到

[java]  view plain  copy

 print ?

1. +++ base/services/jni/Android.mk    (working copy)  
2. @@ -16,6 +16,7 @@  
3.      com_android_server_VibratorService.cpp \  
4.      com_android_server_location_GpsLocationProvider.cpp \  
5.      com_android_server_connectivity_Vpn.cpp \  
6. +    com_android_server_VirtualInputService.cpp \  
7.      onload.cpp  

4、service添加： base/services/java/com/android/server/VirtualInputService.java   
   其必须继承IVirtualInputManager.Stub使其能被远程调用；
   声明native方法：private native static int native_open();
 private native static boolean native_close();
private native static boolean native_sendir(int keycode, int type);

[java]  view plain  copy

 print ?

1. +package com.android.server;  
2. +  
3. +import android.content.Context;  
4. +import android.hardware.input.IVirtualInputManager;  
5. +import android.util.Log;  
6. +  
7. +import java.io.File;  
8. +import java.util.ArrayList;  
9. +  
10. +public class VirtualInputService extends IVirtualInputManager.Stub {  
11. +    private static final String TAG = "VirtualInputManager";  
12. +  
13. +    private final Context mContext;  
14. +    private int mVirtualInputFd = -1;  
15. +  
16. +    public VirtualInputService(Context context) {  
17. +        mContext = context;  
18. +       if(mVirtualInputFd == -1){  
19. +           mVirtualInputFd = native_open();  
20. +           Log.d(TAG, "mVirtualInputFd:"+mVirtualInputFd);  
21. +       }else  
22. +           Log.d(TAG, "mVirtualInputFd1:"+mVirtualInputFd);  
23. +  
24. +    }  
25. +  
26. +   public boolean SendIR(int keycode){  
27. +       if(mVirtualInputFd > 0)  
28. +       {     
29. +           Log.d(TAG, "Service SendIR:"+keycode);  
30. +           return native_sendir(keycode,0);  
31. +       }  
32. +       else   
33. +           return false;  
34. +   }  
35. +     
36. +    private native static int native_open();  
37. +   private native static boolean native_close();  
38. +   private native static boolean native_sendir(int keycode, int type);  
39. +  
40. +}    

5、base/services/java/com/android/server/SystemServer.java中添加新service

[java]  view plain  copy

 print ?

1. SerialService serial = null;  
2. VirtualInputService VirtualInput = null;  
3.  TwilightService twilight = null;  

[java]  view plain  copy

 print ?

1.              try {  
2. +                Slog.i(TAG, "VirtualInput Service");  
3. +                VirtualInput = new VirtualInputService(context);  
4. +                ServiceManager.addService(Context.VIRTUALINPUT_SERVICE, VirtualInput);  
5. +            } catch (Throwable e) {  
6. +                Slog.e(TAG, "Failure starting VirtualInputService", e);  
7. +            }  
8. +             
9. +            try {  
10.                  Slog.i(TAG, "Twilight Service");  
11.                  twilight = new TwilightService(context);  
12.              } catch (Throwable e) {  

6、添加aidl接口：base/core/java/android/hardware/input/IVirtualInputManager.aidl

[java]  view plain  copy

 print ?

1. +package android.hardware.input;  
2. +  
3. +  
4. +/** @hide */  
5. +interface IVirtualInputManager  
6. +{  
7. +   boolean SendIR(int keycode);  
8. +}  

7、实现IVirtualInputManager.java;base/core/java/android/hardware/input/VirtualInputManager.java

[java]  view plain  copy

 print ?

1. +package android.hardware.input;  
2. +  
3. +import android.app.PendingIntent;  
4. +import android.content.Context;  
5. +import android.os.Bundle;  
6. +import android.os.ParcelFileDescriptor;  
7. +import android.os.RemoteException;  
8. +import android.os.SystemProperties;  
9. +import android.util.Log;  
10. +  
11. +import java.io.IOException;  
12. +import java.util.HashMap;  
13. +  
14. +/** 
15. + * @hide 
16. + */  
17. +public class VirtualInputManager {  
18. +    private static final String TAG = "VirtualInputManager";  
19. +  
20. +    private final Context mContext;  
21. +    private final IVirtualInputManager mService;  
22. +  
23. +    /** 
24. +     * {@hide} 
25. +     */  
26. +    public VirtualInputManager(Context context, IVirtualInputManager service) {  
27. +        mContext = context;  
28. +        mService = service;  
29. +       Log.d(TAG,"VirtualInputManager");  
30. +    }  
31. +  
32. +   public boolean SendIR(int keycode) throws android.os.RemoteException{  
33. +       Log.d(TAG,"keycode:"+keycode);  
34. +       return mService.SendIR(keycode);  
35. +   }  
36. +}  

8.framwork/base/Android.mk

[java]  view plain  copy

 print ?

1. core/java/android/hardware/input/IInputManager.aidl \  
2. core/java/android/hardware/input/IVirtualInputManager.aidl \  
3. core/java/android/hardware/input/IInputDevicesChangedListener.aidl \  

9、base/core/java/android/content/Context.java  中添加系统获取服务的标示 

[java]  view plain  copy

 print ?

1. +    public static final String VIRTUALINPUT_SERVICE = "virtualinput";  

10、base/core/java/android/app/ContextImpl.java

[java]  view plain  copy

 print ?

1. +        registerService(VIRTUALINPUT_SERVICE, new ServiceFetcher() {  
2. +                public Object createService(ContextImpl ctx) {  
3. +                    IBinder b = ServiceManager.getService(VIRTUALINPUT_SERVICE);  
4. +                    return new VirtualInputManager(ctx, IVirtualInputManager.Stub.asInterface(b));  
5. +                }});  
6. +                 

   以上就是添加一个完整的service的步骤了...

原文地址：http://blog.youkuaiyun.com/cuityanxi/article/details/18082303