Android framwork service添加(manager 遠程調service，service jni調na

在平常android應用開發中，多數只是調framwork中的API進行application layer的coding，而在系統開發中可能會自己添加系統服務；
系統服務如任何添加，服務如何調native code，以及service如何被manager調用...這裡我給出一個結果驗證的demo。

1、實現編寫native code，framwork/base/services/jni/com_android_server_VirtualInputService.cpp;

以下是會使用到的native 函數，以及register_android_server_VirtualInputService；具體實現就不在詳講了。

static JNINativeMethod method_table[] = {    {"native_open",             "()I",(void *)android_server_VirtualInputService_open},    {"native_close",            "()Z",  (void *)android_server_VirtualInputService_close},    {"native_sendir",       "(II)Z",  (void *)android_server_VirtualInputService_sendir},};   +int register_android_server_VirtualInputService(JNIEnv *env)+{+    jclass clazz = env->FindClass("com/android/server/VirtualInputService");+    if (clazz == NULL) {+        ALOGE("Can't find com/android/server/VirtualInputService");+        return -1;+    }++    return jniRegisterNativeMethods(env, "com/android/server/VirtualInputService",+            method_table, NELEM(method_table));+}+};

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

 int register_android_server_SerialService(JNIEnv* env);+int register_android_server_VirtualInputService(JNIEnv* env); int register_android_server_UsbDeviceManager(JNIEnv* env);       register_android_server_SerialService(env);+register_android_server_VirtualInputService(env);     register_android_server_InputApplicationHandle(env);

3、mk中添加com_android_server_VirtualInputService，使其被編譯到

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

4、service添加： base/services/java/com/android/server/VirtualInputService.java
其必須繼承IVirtualInputManager.Stub使其能被遠程調用；
聲明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);

+package com.android.server;++import android.content.Context;+import android.hardware.input.IVirtualInputManager;+import android.util.Log;++import java.io.File;+import java.util.ArrayList;++public class VirtualInputService extends IVirtualInputManager.Stub {+    private static final String TAG = "VirtualInputManager";++    private final Context mContext;+    private int mVirtualInputFd = -1;++    public VirtualInputService(Context context) {+        mContext = context;+if(mVirtualInputFd == -1){+        mVirtualInputFd = native_open();+Log.d(TAG, "mVirtualInputFd:"+mVirtualInputFd);+}else+Log.d(TAG, "mVirtualInputFd1:"+mVirtualInputFd);++    }++public boolean SendIR(int keycode){+if(mVirtualInputFd > 0)+{+Log.d(TAG, "Service SendIR:"+keycode);+return native_sendir(keycode,0);+}+else +return false;+}++    private native static int native_open();+private native static boolean native_close();+private native static boolean native_sendir(int keycode, int type);++}  

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

   SerialService serial = null;+  VirtualInputService VirtualInput = null;    TwilightService twilight = null;

             try {+                Slog.i(TAG, "VirtualInput Service");+                VirtualInput = new VirtualInputService(context);+                ServiceManager.addService(Context.VIRTUALINPUT_SERVICE, VirtualInput);+            } catch (Throwable e) {+                Slog.e(TAG, "Failure starting VirtualInputService", e);+            }++            try {                 Slog.i(TAG, "Twilight Service");                 twilight = new TwilightService(context);             } catch (Throwable e) {

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

+package android.hardware.input;+++/** @hide */+interface IVirtualInputManager+{+boolean SendIR(int keycode);+}

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

+package android.hardware.input;++import android.app.PendingIntent;+import android.content.Context;+import android.os.Bundle;+import android.os.ParcelFileDescriptor;+import android.os.RemoteException;+import android.os.SystemProperties;+import android.util.Log;++import java.io.IOException;+import java.util.HashMap;++/**+ * @hide+ */+public class VirtualInputManager {+    private static final String TAG = "VirtualInputManager";++    private final Context mContext;+    private final IVirtualInputManager mService;++    /**+     * {@hide}+     */+    public VirtualInputManager(Context context, IVirtualInputManager service) {+        mContext = context;+        mService = service;+Log.d(TAG,"VirtualInputManager");+    }++public boolean SendIR(int keycode) throws android.os.RemoteException{+Log.d(TAG,"keycode:"+keycode);+return mService.SendIR(keycode);+}+}

8.framwork/base/Android.mk

 core/java/android/hardware/input/IInputManager.aidl \+core/java/android/hardware/input/IVirtualInputManager.aidl \ core/java/android/hardware/input/IInputDevicesChangedListener.aidl \

9、base/core/java/android/content/Context.java 中添加系統擷取服務的標示

+    public static final String VIRTUALINPUT_SERVICE = "virtualinput";

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

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

以上就是添加一個完整的service的步驟了...