安卓添加系统服务接口以及测试用例

首先在frameworks/base/下创建如下目录mcserial/java/com/mc/serial然后在此目录下添加如下三个文件IMcSerialNumService.aidl McSerialNumManager.java McSerialNumService.java，三个文件内容如下。首先是IMcSerialNumService.aidl文件，具体内容如下

package com.mc.serial;

interface IMcSerialNumService {
     boolean setSerialNum(String value);
}
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主要是增加接口，接着McSerialNumManager.java文件，这里也是接口，主要实现是在服务里面。

package com.mc.serial;

import android.util.Log;
import android.content.Context;
import android.os.RemoteException;

public class McSerialNumManager {
        private static final String TAG  = "McSerialManager";
        private IMcSerialNumService mService;
        private Context mContext;

        public McSerialNumManager(Context context, IMcSerialNumService service) {
                mContext = context;
                mService = service;
        }

        public boolean setSerialNum(String value) {
                try {
                    return mService.setSerialNum(value);
                } catch (RemoteException e) {
                        Log.e(TAG, "Service not running.");
                        return false;
                }
        }


}
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接着就是服务McSerialNumService.java文件了。

package com.mc.serial;

import android.util.Log;
import android.os.SystemProperties;
import android.content.Context;

public class McSerialNumService extends IMcSerialNumService.Stub {
        public static final String TAG = "zxy McSerialService";
        private Context mContext;

        public McSerialNumService(Context context) {
                mContext = context;
        }

        public boolean setSerialNum(String value){
                Log.d(TAG,"setSerialNum = " + value);
                SystemProperties.set("ro.serialno", value);
                String mSerialNum = SystemProperties.get("ro.serialno",null);
                Log.d(TAG,"get setSerialNum = " + mSerialNum);
                if (mSerialNum.equals(value) ) return true;
                else return false;
        }
}
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这里为具体实现的功能。至此，一个接口就添加完成了。然后添加到白名单中，我这里的文件是这里，这个需要根据sdk去修改对应的文件。

--- a/android/build/make/core/tasks/check_boot_jars/package_whitelist.txt
+++ b/android/build/make/core/tasks/check_boot_jars/package_whitelist.txt
@@ -263,3 +263,5 @@ com\.mc\.android\.mchardwarestatusmanager
+com\.mc\.serial
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接着修改Android.bp，让我们编写的文件能参与编译

diff --git a/android/frameworks/base/Android.bp b/android/frameworks/base/Android.bp
index 9b3e1dd578..53ddbfe5d5 100644
--- a/android/frameworks/base/Android.bp
+++ b/android/frameworks/base/Android.bp
@@ -75,6 +75,8 @@ java_defaults {
         "wifi/java/**/*.java",
         "keystore/java/**/*.java",
         "rs/java/**/*.java",
+       "mcserial/java/**/*.java",
+       "mcserial/java/com/mc/serial/IMcSerialNumService.aidl",

         ":framework-javastream-protos",
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接着添加我们的服务名称。

diff --git a/android/frameworks/base/core/java/android/content/Context.java b/android/frameworks/base/core/java/android/content/Context.java
index 3be4ed4905..aefc5f6802 100644
--- a/android/frameworks/base/core/java/android/content/Context.java
+++ b/android/frameworks/base/core/java/android/content/Context.java
@@ -3825,6 +3825,13 @@ public abstract class Context {
      */
     @TestApi public static final String TEST_NETWORK_SERVICE = "test_network";

+
+    /**
+         * @see #getSystemService
+         * @see com.mc.android.McFirmwareInfoManager
+     */
+    public static final String MCSERIALNUM_SERVICE = "mcserialnum";
+
     /**
         * @see #getSystemService
         * @see com.mc.android.McFirmwareInfoManager
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然后就是注册服务了。

diff --git a/android/frameworks/base/core/java/android/app/SystemServiceRegistry.java b/android/frameworks/base/core/java/android/app/SystemServiceRegistry.java
index 1b687d860c..72cb7b2cab 100644
--- a/android/frameworks/base/core/java/android/app/SystemServiceRegistry.java
+++ b/android/frameworks/base/core/java/android/app/SystemServiceRegistry.java
@@ -204,6 +204,10 @@ import com.mc.android.mcsecure.McSecureService;
 import com.mc.android.mcsecure.McSecureManager;
 import com.mc.android.mcbootanimation.McBootanimationManager;
 import com.mc.android.mcbootanimation.IMcBootanimationService;
+
+import com.mc.serial.McSerialNumManager;
+import com.mc.serial.IMcSerialNumService;
+
 import com.mc.android.mctime.McTimeManager;
 import com.mc.android.mctime.IMcTimeService;
 import com.mc.android.mchardwarestatusmanager.McHardwareStatusManager;
@@ -776,6 +780,14 @@ final class SystemServiceRegistry {
                 return new SerialManager(ctx, ISerialManager.Stub.asInterface(b));
             }});

+       registerService(Context.MCSERIALNUM_SERVICE, McSerialNumManager.class,
+                new CachedServiceFetcher<McSerialNumManager>() {
+            @Override
+            public McSerialNumManager createService(ContextImpl ctx) {
+                IBinder b = ServiceManager.getService(Context.MCSERIALNUM_SERVICE);
+                return new McSerialNumManager(ctx, IMcSerialNumService.Stub.asInterface(b));
+            }});
+
        registerService(Context.MCFIRMWAREINFO_SERVICE, McFirmwareInfoManager.class,
                 new CachedServiceFetcher<McFirmwareInfoManager>() {
             @Override
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这里是添加服务。

diff --git a/android/frameworks/base/services/java/com/android/server/SystemServer.java b/android/frameworks/base/services/java/com/android/server/SystemServer.java
index 097ec808e7..07d36ad7bd 100644
--- a/android/frameworks/base/services/java/com/android/server/SystemServer.java
+++ b/android/frameworks/base/services/java/com/android/server/SystemServer.java
@@ -186,6 +186,8 @@ import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.Future;
 import dalvik.system.DexClassLoader;

+import com.mc.serial.McSerialNumService;
+
 import com.mc.android.mcfirmwareinfo.McFirmwareInfoService;
 import com.mc.android.mcsystemui.McSystemUiService;

@@ -949,6 +951,7 @@ public final class SystemServer {
         NsdService serviceDiscovery = null;
         WindowManagerService wm = null;
         SerialService serial = null;
+       McSerialNumService mcSerialNumservice = null;
         McFirmwareInfoService mcFirmwareInfoMS = null;
         McHomeManagerService  mcHomeManagerService = null;
        McWatchdogService mcWatchdogMS = null;
@@ -1693,6 +1696,14 @@ public final class SystemServer {
                 Slog.e(TAG, "Failure starting McEthernetService", e);
             }

+           try {
+                Slog.i(TAG, "McSerialNumService Service");
+                mcSerialNumservice = new McSerialNumService(context);
+                ServiceManager.addService(Context.MCSERIALNUM_SERVICE, mcSerialNumservice);
+            } catch (Throwable e) {
+                Slog.e(TAG, "Failure starting McFirmwareInfoService", e);
+            }
+
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至此所有都添加完成了。添加完成后先执行make update-api命令，然后frameworks/base/api/current.txt会更新。

diff --git a/android/frameworks/base/api/current.txt b/android/frameworks/base/api/current.txt
index 6b9d0929f1..02137315c0 100755
--- a/android/frameworks/base/api/current.txt
+++ b/android/frameworks/base/api/current.txt
@@ -9842,6 +9842,7 @@ package android.content {
     field public static final String MCETHTETHER_SERVICE = "mcethtether";
     field public static final String MCFIRMWAREINFO_SERVICE = "mcfirmwareinfo";
     field public static final String MCNETCOEXIST_SERVICE = "mcnetcoexist";
+    field public static final String MCSERIALNUM_SERVICE = "mcserialnum";
     field public static final String MCSOUND_SERVICE = "mcsound";
     field public static final String MCWATCHDOG_SERVICE = "mcwatchdog";
     field public static final String MC_BOOTANIMATION_MANAGER = "mcBootanimationManager";
@@ -58058,6 +58059,29 @@ package com.mc.android.mctime {

 }

+package com.mc.serial {
+
+  public interface IMcSerialNumService extends android.os.IInterface {
+    method public boolean setSerialNum(String) throws android.os.RemoteException;
+  }
+
+  public static class IMcSerialNumService.Default implements com.mc.serial.IMcSerialNumService {
+    ctor public IMcSerialNumService.Default();
+    method public android.os.IBinder asBinder();
+    method public boolean setSerialNum(String) throws android.os.RemoteException;
+  }
+
+  public abstract static class IMcSerialNumService.Stub extends android.os.Binder implements com.mc.serial.IMcSerialNumService {
+    ctor public IMcSerialNumService.Stub();
+    method public android.os.IBinder asBinder();
+    method public static com.mc.serial.IMcSerialNumService asInterface(android.os.IBinder);
+    method public static com.mc.serial.IMcSerialNumService getDefaultImpl();
+    method public boolean onTransact(int, android.os.Parcel, android.os.Parcel, int) throws android.os.RemoteException;
+    method public static boolean setDefaultImpl(com.mc.serial.IMcSerialNumService);
+  }
+
+}
+
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然后编译安卓即可。接着就是添加测试了，首先使用AS创建个新工程。然后如下图所示创建个新module，

选择如下所示选项，然后点击finish即可。

然后工程就多了如下图所示module。

接着在此module添加IMcSerialNumService.aidl和McSerialNumManager.java文件，如下图所示。

这里IMcSerialNumService.aidl文件内容同之前在源码中添加的相同即可。

接着修改McSerialNumManager.java文件，内容如下。

这里只保留了方法即可。然后点击这个即可实现编译。

等待编译完成，产生如下图所示aar包即可。