近日，在搞一套开机启动的Service，虽然在之前低版本弄过，以为直接照搬过来就可以了，结果还出了一堆问题，比如framework里边@NonNull检测、selinux新规则等等，废了本尊些许时日才完工～
且听我一一道来～～～～
首先，在framework相关目录添加Service和aidl文件；
在frameworks/base/core/java/android/app/目录创建genie目录，新建如下两个文件：
GeniePadManager.java：
package android.app.genie;
import android.content.Context;
import android.os.RemoteException;
import android.util.Slog;
import android.annotation.NonNull;
public class GeniePadManager {
Context mContext;
IGeniePadManager mService;
static final String TAG = "GeniePadManager";
public GeniePadManager(@NonNull Context context, @NonNull IGeniePadManager service) {
mContext = context;
mService = service;
if (mService != null)
Slog.d(TAG, "====== mService not null");
else
Slog.d(TAG, "====== mService not null");
}
public @NonNull String getPadBrightness() {
if (mService != null) {
try {
//Slog.d(TAG, " Will return getPadBrightness");
return mService.getPadBrightness();
} catch (RemoteException e) {
Slog.d(TAG, "RemoteException " + e);
return null;
}
}
return null;
}
public @NonNull String getTpVersion() {
if (mService != null) {
try {
Slog.d(TAG, "====== Will return getTpVersion");
return mService.getTpVersion();
} catch (RemoteException e) {
Slog.d(TAG, "RemoteException " + e);
return null;
}
}
return null;
}
}
IGeniePadManager.aidl:
package android.app.genie;
interface IGeniePadManager {
String getPadBrightness();
String getTpVersion();
}
第二步：执行一次make update-api，会遇到类似下边的报错日志：
1 new API lint issues were found. See tools/metalava/API-LINT.md for how to handle these.
这是Android的lint检查，之前的版本没有明显语法错误是不报错的，android11规范了这种语法，会报错，
假设报错提示为：
Missing nullability on method csdn() return [MissingNullability]
则需要在方法之前添加@NonNull关键字，这是解决这个问题的方案之一；还有一个更简单的方案，就是直接忽略掉这个目录的lint检查：
修改framework/base目录下的Android.bp
diff --git a/Android.bp b/Android.bp
index 14a2bff8a..fd2c2dcb9 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.genie "
build = [
"StubLibraries.bp",
第三步：解决掉编译错误，顺利的话可以make update-api成功：
api文件会自动生成如下的改动：
diff --git a/api/current.txt b/api/current.txt
index 0d8a2c56c..fee9c416e 100644
--- a/api/current.txt
+++ b/api/current.txt
@@ -7616,6 +7616,37 @@ package android.app.blob {
}
+package android.app.genie {
+
+ public class GeniePadManager {
+ ctor public GeniePadManager(@NonNull android.content.Context, @NonNull android.app.genie.IGeniePadManager);
+ method @NonNull public String getPadBrightness();
+ method @NonNull public String getTpVersion();
+ }
+
+ public interface IGeniePadManager extends android.os.IInterface {
+ method public String getPadBrightness() throws android.os.RemoteException;
+ method public String getTpVersion() throws android.os.RemoteException;
+ }
+
+ public static class IGeniePadManager.Default implements android.app.genie.IGeniePadManager {
+ ctor public IGeniePadManager.Default();
+ method public android.os.IBinder asBinder();
+ method public String getPadBrightness() throws android.os.RemoteException;
+ method public String getTpVersion() throws android.os.RemoteException;
+ }
+
+ public abstract static class IGeniePadManager.Stub extends android.os.Binder implements android.app.genie.IGeniePadManager {
+ ctor public IGeniePadManager.Stub();
+ method public android.os.IBinder asBinder();
+ method public static android.app.genie.IGeniePadManager asInterface(android.os.IBinder);
+ method public static android.app.genie.IGeniePadManager getDefaultImpl();
+ method public boolean onTransact(int, android.os.Parcel, android.os.Parcel, int) throws android.os.RemoteException;
+ method public static boolean setDefaultImpl(android.app.genie.IGeniePadManager);
+ }
+
+}
+
package android.app.job {
public class JobInfo implements android.os.Parcelable {
@@ -10193,6 +10224,7 @@ 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 GENIEPAD_SERVICE = "geniepad";
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";
--- a/non-updatable-api/current.txt
+++ b/non-updatable-api/current.txt
@@ -7616,6 +7616,37 @@ package android.app.blob {
}
+package android.app.genie {
+
+ public class GeniePadManager {
+ ctor public GeniePadManager(@NonNull android.content.Context, @NonNull android.app.genie.IGeniePadManager);
+ method @NonNull public String getPadBrightness();
+ method @NonNull public String getTpVersion();
+ }
+
+ public interface IGeniePadManager extends android.os.IInterface {
+ method public String getPadBrightness() throws android.os.RemoteException;
+ method public String getTpVersion() throws android.os.RemoteException;
+ }
+
+ public static class IGeniePadManager.Default implements android.app.genie.IGeniePadManager {
+ ctor public IGeniePadManager.Default();
+ method public android.os.IBinder asBinder();
+ method public String getPadBrightness() throws android.os.RemoteException;
+ method public String getTpVersion() throws android.os.RemoteException;
+ }
+
+ public abstract static class IGeniePadManager.Stub extends android.os.Binder implements android.app.genie.IGeniePadManager {
+ ctor public IGeniePadManager.Stub();
+ method public android.os.IBinder asBinder();
+ method public static android.app.genie.IGeniePadManager asInterface(android.os.IBinder);
+ method public static android.app.genie.IGeniePadManager getDefaultImpl();
+ method public boolean onTransact(int, android.os.Parcel, android.os.Parcel, int) throws android.os.RemoteException;
+ method public static boolean setDefaultImpl(android.app.genie.IGeniePadManager);
+ }
+
+}
+
package android.app.job {
public class JobInfo implements android.os.Parcelable {
@@ -10193,6 +10224,7 @@ 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 GENIEPAD_SERVICE = "geniepad";
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";
第四步：如上所示是添加完成了接口文件，并且编译完成，这一步开始如何添加至系统开机启动，添加方式如下：
--- a/core/java/android/app/SystemServiceRegistry.java
+++ b/core/java/android/app/SystemServiceRegistry.java
@@ -44,6 +44,8 @@ import android.app.usage.IUsageStatsManager;
import android.app.usage.NetworkStatsManager;
import android.app.usage.StorageStatsManager;
import android.app.usage.UsageStatsManager;
+import android.app.genie.GeniePadManager;
+import android.app.genie.IGeniePadManager;
import android.appwidget.AppWidgetManager;
import android.bluetooth.BluetoothManager;
import android.companion.CompanionDeviceManager;
@@ -1216,6 +1218,18 @@ public final class SystemServiceRegistry {
}
});
+ registerService(Context.GENIEPAD_SERVICE, GeniePadManager.class,
+ new CachedServiceFetcher() {
+ @Override
+ public GeniePadManager createService(ContextImpl ctx)
+ throws ServiceNotFoundException {
+ IBinder b = ServiceManager.getServiceOrThrow(
+ Context.GENIEPAD_SERVICE);
+ IGeniePadManager service = IGeniePadManager.Stub.asInterface(b);
+ return new GeniePadManager(ctx.getOuterContext(), service);
+ }
+ });
+
registerService(Context.SLICE_SERVICE, SliceManager.class,
new CachedServiceFetcher() {
@Override
为service自定义名称：
diff --git a/core/java/android/content/Context.java b/core/java/android/content/Context.java
index 8472144a9..380e0df29 100644
--- a/core/java/android/content/Context.java
+++ b/core/java/android/content/Context.java
@@ -4188,6 +4188,8 @@ public abstract class Context {
*/
public static final String AUDIO_SERVICE = "audio";
+ public static final String GENIEPAD_SERVICE = "geniepad";
+
/**
* AuthService orchestrates biometric and PIN/pattern/password authentication.
*
--- a/services/java/com/android/server/SystemServer.java
+++ b/services/java/com/android/server/SystemServer.java
@@ -180,6 +180,7 @@ import com.android.server.webkit.WebViewUpdateService;
import com.android.server.wm.ActivityTaskManagerService;
import com.android.server.wm.WindowManagerGlobalLock;
import com.android.server.wm.WindowManagerService;
+import com.android.server.GeniePadManagerService;
import dalvik.system.PathClassLoader;
import dalvik.system.VMRuntime;
@@ -1625,6 +1626,16 @@ public final class SystemServer {
}
t.traceEnd();
+ t.traceBegin("StartGeniePadManagerService");
+ try {
+ Slog.i(TAG, "PadManager Service is create");
+ ServiceManager.addService(Context.GENIEPAD_SERVICE,
+ new GeniePadManagerService(context));
+ } catch (Throwable e) {
+ reportWtf("starting GeniePadManagerService", e);
+ }
+ t.traceEnd();
+
t.traceBegin("StartNotificationManager");
mSystemServiceManager.startService(NotificationManagerService.class);
SystemNotificationChannels.removeDeprecated(context);
第五步：简单描述下如何调用该接口：
mManager = (GeniePadManager) mmContext.getSystemService(Context.GENIEPAD_SERVICE);
mManager.getTpVersion();
最后，编译刷机，验证接口是否可用；
刷机后，发现还是太乐观了，一大块没搞，就是selinux规则配置添加：
修改device/mediatek/sepolicy/bsp目录下te文件，android11针对系统级Service更是添加了严苛规则，需要对servicemanager赋予add和find属性，具体流程及报错不在赘述，直接上最终极改动：
diff --git a/non_plat/file.te b/non_plat/file.te
index 69bfd33..f6de6ac 100644
--- a/non_plat/file.te
+++ b/non_plat/file.te
@@ -96,3 +96,6 @@ type proc_mtk_mdp_debug, fs_type, proc_type;
# Date : 2020/12/22
# Purpose: add permission for /data/vendor/hmp/
type data_vendor_hmp_file, data_file_type, file_type;
+
+# tp
+type tp_file, fs_type, proc_type;
diff --git a/non_plat/file_contexts b/non_plat/file_contexts
index 572925c..69f6a2d 100644
--- a/non_plat/file_contexts
+++ b/non_plat/file_contexts
@@ -215,3 +215,6 @@ data/duraspeed(/.*)? u:object_r:duraspeed_data_file:s0
# Date: 2020/12/29
# Purpose: mtk hmp info file
/data/vendor/hmp(/.*)? u:object_r:data_vendor_hmp_file:s0
+
+# tp
+/proc/android_touch(/.*)? u:object_r:tp_file:s0
diff --git a/non_plat/genfs_contexts b/non_plat/genfs_contexts
index 6ddcf5f..2814908 100644
--- a/non_plat/genfs_contexts
+++ b/non_plat/genfs_contexts
@@ -46,3 +46,7 @@ genfscon sysfs /devices/platform/soc/11170000.sdio/mmc_host/mmc1/mmc1:0001/mmc1:
genfscon sysfs /devices/platform/soc/11170000.sdio/mmc_host/mmc1/mmc1:0001/mmc1:0001:1/net/ap0/mtu u:object_r:sysfs_net:s0
genfscon sysfs /devices/platform/soc/11170000.sdio/mmc_host/mmc1/mmc1:0001/mmc1:0001:1/net/p2p0/mtu u:object_r:sysfs_net:s0
+
+# tp node
+genfscon proc /android_touch/vendor u:object_r:tp_file:s0
+
diff --git a/non_plat/system_app.te b/non_plat/system_app.te
index 818c7c6..c9cc837 100644
--- a/non_plat/system_app.te
+++ b/non_plat/system_app.te
@@ -182,3 +182,8 @@ allow system_app mtk_audiohal_data_file:file create_file_perms;
# Purpose: Allow atmwifimeta apk to use HIDL and access loghidlvendorservice
allow system_app mtk_hal_log_hwservice:hwservice_manager find;
binder_call(system_app, loghidlvendorservice);
+
+# tp
+allow system_app tp_file:dir { search read };
+allow system_app tp_file:file { read write open getattr };
+allow system_app genie_padmanager_service:service_manager { find add };
diff --git a/non_plat/system_server.te b/non_plat/system_server.te
index 3908c9a..23762e5 100644
--- a/non_plat/system_server.te
+++ b/non_plat/system_server.te
@@ -222,3 +222,8 @@ allow system_server proc_mtk_mdp_debug:file getattr;
# Date:2021/04/10
# Operation:allow CachedAppOptimi to search /proc/mtk_mdp_debug
allow system_server proc_mtk_mdp_debug:dir search;
+
+# For system service tp permission
+allow system_server tp_file:dir { search read };
+allow system_server tp_file:file { read write open getattr };
+allow system_server genie_padmanager_service:service_manager { find add };
diff --git a/plat_private/service_contexts b/plat_private/service_contexts
index 34255bf..fcac889 100644
--- a/plat_private/service_contexts
+++ b/plat_private/service_contexts
@@ -33,6 +33,7 @@ capctrl u:object_r:mtk_radio_service:s0
vow_bridge u:object_r:mtk_vowbridge_service:s0
autoboot u:object_r:mtk_autoboot_service:s0
smartratswitch u:object_r:mtk_radio_service:s0
+geniepad u:object_r:genie_padmanager_service:s0
# Other Services
GoogleOtaBinder u:object_r:ota_agent_service:s0
diff --git a/plat_public/service.te b/plat_public/service.te
index 91d97ec..86cd6b3 100644
--- a/plat_public/service.te
+++ b/plat_public/service.te
@@ -40,6 +40,7 @@ type vtservice_hidl_service, service_manager_type;
type mtk_hdmi_service,service_manager_type;
type ppl_agent_service, service_manager_type;
type mtk_gwsd_service, service_manager_type;
+type genie_padmanager_service, service_manager_type;
# Trustonic Services
type tee_service, service_manager_type;
至此，增量编译，上一步示例接口才能拿到数据～
大功告成！Mark～
