Android11添加AIDL系统服务及HIDL接口服务

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已于 2023-01-15 10:55:01 修改 · 5.5k 阅读

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CC 4.0 BY-SA版权

文章标签：

#HIDL #AIDL #Hardware #SurfaceFlinger #JNI

于 2022-12-22 17:01:43 首次发布

软件平台：Android11

硬件平台：QCS6125

直接上需求：首先添加自定义系统服务并且开机自启动；其次该服务要调用HW层service的方法。

前半部分之前添加过N次，不是难点，后半部分的实现最开始也是想借助binder通信，直接去调用接口，遇到了一大堆selinux权限问题，这是google针对android8.0之后新添加的策略，使用了三个binder，分别是标准/dev/binder该节点主要用于System分区的系统服务去注册使用，/dev/hwbinder该节点主要用于运行于HW的服务注册使用，/dev/vndbinder该节点主要用于运行在vendor分区的服务注册使用，而需求中所说的HW层的服务注册的是vndbinder，自定义的服务是binder，因此系统层面是隔离的，无法通过binder直接通信，只能通过hwbinder去迂回，因为binder可以跟hwbinder通信，而hwbinder可以和vndbinder交互，从而达到binder服务和vndbinder服务通信的目的。

前半部分（系统服务）的实现：

1、创建frameworks/base/core/java/android/app/yfd/目录，建立如下文件：

HandWriteManager.java

/*************************************************************************
	* File Name: HandWriteManager.java
	* Author: kongbo 
	* Mail: shenyoutianji@126.com 
	* Created Time: 2022年11月21日 星期一 17时17分35秒
 ************************************************************************/
package android.app.yfd;

import android.content.Context;

import android.os.RemoteException;

import android.util.Slog;

public class HandWriteManager {

    Context mContext;

    IHandWriteManager mService;

    static final String TAG = "HandWriteManager";

    public HandWriteManager(Context context, IHandWriteManager service) {

        mContext = context;

        mService = service;

        if (mService != null)

            Slog.d(TAG, " mService not null");

    }
		
	public void setRefreshMode(int mode) {

        if (mService != null) {
            Slog.d(TAG, " Will setRefreshMode");
            try {
                mService.setRefreshMode(mode);

            } catch (RemoteException e) {

                Slog.d(TAG, "RemoteException " + e);

            }

        }

        //return null;
    }

    public void commitRefreshArea(int x, int y, int h, int w) {
        if (mService != null) {
            Slog.d(TAG, " Will commitRefreshArea");
            try {
                mService.commitRefreshArea(x, y, h, w);

            } catch (RemoteException e) {

                Slog.d(TAG, "RemoteException " + e);

            }

        }
    }

}

IHandWriteManager.aidl

/**

* Hand Writes Service

*/

package android.app.yfd;

interface IHandWriteManager {

    void setRefreshMode(int mode);

    void commitRefreshArea(int x, int y, int h, int w);

}

frameworks/base/services/core/java/com/android/server目录添加HandWriteManagerService.java

/*************************************************************************
	* File Name: HandWriteManagerService.java
	* Author: kongbo
	* Mail:nubility@gmail.com 
	* Created Time: 2022年11月21日 星期一 17时36分04秒
 ************************************************************************/
package com.android.server;

import android.app.yfd.IHandWriteManager;

import android.content.Context;

import android.os.Build;

import android.util.Slog;

import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.FileWriter;

import java.io.FileReader;

import java.io.IOException;

public class HandWriteManagerService extends IHandWriteManager.Stub {

    private Context mContext;

    static final String TAG = "HandWriteManagerService";

    private boolean Debug = true;

    private final int LEISURE_MODE = 1;

    private final int WRITE_MODE = 2;

    private final int NETWORK_MODE = 3;

    private native void HandWriteServiceNative_setRefreshMode(int mode);
    private native void HandWriteServiceNative_Init();
    private native void HandWriteServiceNative_commitRefreshArea(int x, int y, int h, int w);

	public HandWriteManagerService(Context context) {
        //Slog.e(TAG," ====== call native method HandWriteServiceNative_Init");
        HandWriteServiceNative_Init();
        mContext = context;
		/*try {
            Slog.e(TAG," ====== Runtime will exec ======");
            Runtime.getRuntime().exec("su");
            Runtime.getRuntime().exec("vndservice call display.qservice 47 i32 2");
            Slog.e(TAG," ====== Runtime exec end ======");
		} catch (IOException e) {
            Slog.e(TAG," ====== Runtime exec has exception ======");
            e.printStackTrace();
		}*/
    }

    @Override
    public void setRefreshMode(int mode) {
        BufferedWriter bufWriter = null;

        try {

            //bufWriter = new BufferedWriter(new FileWriter(LMAP_BRIGHTNESS_PATH));

            if (Debug)
                Slog.e(TAG," ====== write brightness:");

            HandWriteServiceNative_setRefreshMode(mode);

            //bufWriter.write(String.valueOf(brightness));

            //bufWriter.close();

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

    @Override
    public void commitRefreshArea(int x, int y, int h, int w) {
        HandWriteServiceNative_commitRefreshArea(x, y, h, w);
    }
}

向SystemServer完成注册：

diff --git a/services/java/com/android/server/SystemServer.java b/services/java/com/android/server/SystemServer.java
index 3d8328bd193..1279df76dd5 100644
--- a/services/java/com/android/server/SystemServer.java
+++ b/services/java/com/android/server/SystemServer.java
@@ -89,6 +89,7 @@ import com.android.internal.util.ConcurrentUtils;
 import com.android.internal.util.EmergencyAffordanceManager;
 import com.android.internal.util.FrameworkStatsLog;
 import com.android.internal.widget.ILockSettings;
+import com.android.server.HandWriteManagerService;
 import com.android.server.am.ActivityManagerService;
 import com.android.server.appbinding.AppBindingService;
 import com.android.server.attention.AttentionManagerService;
@@ -1614,6 +1615,16 @@ public final class SystemServer {
             }
             t.traceEnd();
 
+            t.traceBegin("StartHandWriteManagerService");
+            try {
+                Slog.i(TAG, "HandWriteManagerService is create");
+                ServiceManager.addService(Context.HAND_WRITE_SERVICE,
+                        new HandWriteManagerService(context));
+            } catch (Throwable e) {
+                reportWtf("starting HandWriteManagerService", e);
+            }
+            t.traceEnd();
+
             t.traceBegin("StartNotificationManager");
             mSystemServiceManager.startService(NotificationManagerService.class);
             SystemNotificationChannels.removeDeprecated(context);

diff --git a/core/java/android/app/SystemServiceRegistry.java b/core/java/android/app/SystemServiceRegistry.java
index e599a5ce81e..38473ee5e6e 100644
--- a/core/java/android/app/SystemServiceRegistry.java
+++ b/core/java/android/app/SystemServiceRegistry.java
@@ -43,6 +43,8 @@ import android.app.usage.IUsageStatsManager;
 import android.app.usage.NetworkStatsManager;
 import android.app.usage.StorageStatsManager;
 import android.app.usage.UsageStatsManager;
+import android.app.yfd.HandWriteManager;
+import android.app.yfd.IHandWriteManager;
 import android.appwidget.AppWidgetManager;
 import android.bluetooth.BluetoothManager;
 import android.companion.CompanionDeviceManager;
@@ -1189,6 +1191,17 @@ public final class SystemServiceRegistry {
                     }
                 });
 
+        registerService(Context.HAND_WRITE_SERVICE, HandWriteManager.class,
+                new CachedServiceFetcher<HandWriteManager>() {
+                    @Override
+                    public HandWriteManager createService(ContextImpl ctx)
+                            throws ServiceNotFoundException {
+                        IBinder b = ServiceManager.getServiceOrThrow(
+                                Context.HAND_WRITE_SERVICE);
+                        return new HandWriteManager(ctx, IHandWriteManager.Stub.asInterface(b));
+                    }
+                });
+
         registerService(Context.SLICE_SERVICE, SliceManager.class,
                 new CachedServiceFetcher<SliceManager>() {
                     @Override

在Context.java添加服务ID定义：

diff --git a/core/java/android/content/Context.java b/core/java/android/content/Context.java
index 8472144a92c..d9ee340cd55 100644
--- a/core/java/android/content/Context.java
+++ b/core/java/android/content/Context.java
@@ -5024,6 +5024,15 @@ public abstract class Context {
      */
     public static final String CROSS_PROFILE_APPS_SERVICE = "crossprofileapps";
 
+    /**
+     * Use with {@link #getSystemService(String)} to retrieve a
+     * {@link android.app.yfd.HandWriteManager} for handwriting
+     *
+     * @see #getSystemService(String)
+     * @see android.app.yfd.HandWriteManager
+     */
+    public static final String HAND_WRITE_SERVICE  = "hand_write";
+
     /**
      * Use with {@link #getSystemService} to retrieve a
      * {@link android.se.omapi.ISecureElementService}

此时增量编译代码，会提示api需要更新还有一个lint检测的报错，API更新执行make update-api指令，去掉lint检查需要修改framework/base/Android.bp如下：

diff --git a/Android.bp b/Android.bp
index bf6c99d0cf2..bb4a6a9a4e7 100644
--- a/Android.bp
+++ b/Android.bp
@@ -1219,7 +1219,8 @@ metalava_framework_docs_args = "--manifest $(location core/res/AndroidManifest.x
     "--api-lint-ignore-prefix android.icu. " +
     "--api-lint-ignore-prefix java. " +
     "--api-lint-ignore-prefix junit. " +
-    "--api-lint-ignore-prefix org. "
+    "--api-lint-ignore-prefix org. " +
+    "--api-lint-ignore-prefix android.app.yfd. "
 
 build = [
     "StubLibraries.bp",

在执行完make update-api之后，系统会自动更新api文件：

diff --git a/api/current.txt b/api/current.txt
index 952ccdad992..f91544dde68 100644
--- a/api/current.txt
+++ b/api/current.txt
@@ -8106,6 +8106,37 @@ package android.app.usage {
 
 }
 
+package android.app.yfd {
+
+  public class HandWriteManager {
+    ctor public HandWriteManager(android.content.Context, android.app.yfd.IHandWriteManager);
+    method public void commitRefreshArea(int, int, int, int);
+    method public void setRefreshMode(int);
+  }
+
+  public interface IHandWriteManager extends android.os.IInterface {
+    method public void commitRefreshArea(int, int, int, int) throws android.os.RemoteException;
+    method public void setRefreshMode(int) throws android.os.RemoteException;
+  }
+
+  public static class IHandWriteManager.Default implements android.app.yfd.IHandWriteManager {
+    ctor public IHandWriteManager.Default();
+    method public android.os.IBinder asBinder();
+    method public void commitRefreshArea(int, int, int, int) throws android.os.RemoteException;
+    method public void setRefreshMode(int) throws android.os.RemoteException;
+  }
+
+  public abstract static class IHandWriteManager.Stub extends android.os.Binder implements android.app.yfd.IHandWriteManager {
+    ctor public IHandWriteManager.Stub();
+    method public android.os.IBinder asBinder();
+    method public static android.app.yfd.IHandWriteManager asInterface(android.os.IBinder);
+    method public static android.app.yfd.IHandWriteManager getDefaultImpl();
+    method public boolean onTransact(int, android.os.Parcel, android.os.Parcel, int) throws android.os.RemoteException;
+    method public static boolean setDefaultImpl(android.app.yfd.IHandWriteManager);
+  }
+
+}
+
 package android.appwidget {
 
   public class AppWidgetHost {
@@ -10190,6 +10221,7 @@ package android.content {
     field public static final String EUICC_SERVICE = "euicc";
     field public static final String FILE_INTEGRITY_SERVICE = "file_integrity";
     field public static final String FINGERPRINT_SERVICE = "fingerprint";
+    field public static final String HAND_WRITE_SERVICE = "hand_write";
     field public static final String HARDWARE_PROPERTIES_SERVICE = "hardware_properties";
     field public static final String INPUT_METHOD_SERVICE = "input_method";
     field public static final String INPUT_SERVICE = "input";

diff --git a/non-updatable-api/current.txt b/non-updatable-api/current.txt
index 5f15216e840..c6047ab6ff4 100644
--- a/non-updatable-api/current.txt
+++ b/non-updatable-api/current.txt
@@ -8106,6 +8106,37 @@ package android.app.usage {
 
 }
 
+package android.app.yfd {
+
+  public class HandWriteManager {
+    ctor public HandWriteManager(android.content.Context, android.app.yfd.IHandWriteManager);
+    method public void commitRefreshArea(int, int, int, int);
+    method public void setRefreshMode(int);
+  }
+
+  public interface IHandWriteManager extends android.os.IInterface {
+    method public void commitRefreshArea(int, int, int, int) throws android.os.RemoteException;
+    method public void setRefreshMode(int) throws android.os.RemoteException;
+  }
+
+  public static class IHandWriteManager.Default implements android.app.yfd.IHandWriteManager {
+    ctor public IHandWriteManager.Default();
+    method public android.os.IBinder asBinder();
+    method public void commitRefreshArea(int, int, int, int) throws android.os.RemoteException;
+    method public void setRefreshMode(int) throws android.os.RemoteException;
+  }
+
+  public abstract static class IHandWriteManager.Stub extends android.os.Binder implements android.app.yfd.IHandWriteManager {
+    ctor public IHandWriteManager.Stub();
+    method public android.os.IBinder asBinder();
+    method public static android.app.yfd.IHandWriteManager asInterface(android.os.IBinder);
+    method public static android.app.yfd.IHandWriteManager getDefaultImpl();
+    method public boolean onTransact(int, android.os.Parcel, android.os.Parcel, int) throws android.os.RemoteException;
+    method public static boolean setDefaultImpl(android.app.yfd.IHandWriteManager);
+  }
+
+}
+
 package android.appwidget {
 
   public class AppWidgetHost {
@@ -10190,6 +10221,7 @@ package android.content