由于项目需要，我这边需要在framework层增加一个语音唤醒服务来实现拉通hal层以及android应用层，实现语音黑屏唤醒以及亮屏唤醒的功能，这里我们只看在android7.0和9.0上是怎么增加一个自定义系统服务，其实对着葫芦画瓢就可以了。
下面主要说基于android7.0的添加系统服务，9.0的编译方式改了，改下bp文件就可以了，没什么大的区别，这里删了些复杂的接口，只留了几个比较简单的接口，方便阅读。
1.编写与声明aidl文件
1.1.编写aidl文件
在frameworks/base/core/java/android/新增ovum/ai/IAIManager.aidl文件
package android.ovum.ai;/*** {@hide}*/interface IAIManager {byte[] getAudioData();int getWakeupDoa();void stopAudioData();void wakeupAppStarted(String callerPackage);boolean setEnabled(boolean enabled, String callerPackage);boolean isEnabled(String callerPackage);boolean isRecording(String callerPackage);}
1.2.注册aidl文件
实现完成后需要在frameworks/base/Android.mk 声明我们需要的aidl文件，这个经常忘记了。
core/java/android/ovum/ai/IAIManager.aidl \core/java/android/ovum/performanceobserver/IPerformanceObserverService.aidl \
1.3.封装aidl的接口实现
实现AIManager的接口封装
package android.ovum.ai;import android.content.Context;import android.os.RemoteException;import android.util.Log;/*** {@hide}*/public class AIManager {private static final String TAG = "AIManager";private final Context mContext;private final IAIManager mService;public AIManager(Context context, IAIManager service) {Log.v(TAG, "AIManager()");mContext = context;mService = service;}public void stopAudioData() {try {mService.stopAudioData();} catch (RemoteException e) {e.printStackTrace();}}public int getWakeupDoa() {try {return mService.getWakeupDoa();} catch (RemoteException e) {e.printStackTrace();}return 0;}public byte[] getAudioData() {try {return mService.getAudioData();} catch (RemoteException e) {e.printStackTrace();}return null;}public void wakeupAppStarted() {try {mService.wakeupAppStarted(mContext.getOpPackageName());} catch (RemoteException e) {e.printStackTrace();}}public boolean setEnabled(boolean enabled) {try {return mService.setEnabled(enabled, mContext.getOpPackageName());} catch (RemoteException e) {e.printStackTrace();}return false;}public boolean isEnabled() {try {return mService.isEnabled(mContext.getOpPackageName());} catch (RemoteException e) {e.printStackTrace();}return false;}public boolean isRecording() {try {return mService.isRecording(mContext.getOpPackageName());} catch (RemoteException e) {e.printStackTrace();}return false;}}
2.实现AIManagerService
package com.android.server.ovum;import android.content.Context;import android.media.AudioFormat;import android.os.RemoteException;import android.ovum.ai.IAIManager;import android.util.Slog;import android.media.MediaRecorder;import java.io.FileDescriptor;import java.io.PrintWriter;import android.content.Intent;import android.content.IntentFilter;import android.os.PowerManager;import android.media.AudioManager;import android.media.AudioSystem;import android.app.ActivityManagerInternal;import com.android.server.LocalServices;import static android.content.pm.PackageManager.PERMISSION_GRANTED;import java.util.concurrent.ArrayBlockingQueue;import java.io.FileOutputStream;import java.io.IOException;import java.io.FileNotFoundException;import java.io.File;import .ConnectivityManager;import workInfo;import .wifi.WifiManager;import android.os.Parcelable;import android.content.BroadcastReceiver;import android.provider.Settings;public class AIManagerService extends IAIManager.Stub {private static final String TAG = "AIManagerService";private Context mContext;private static boolean LOG_DEBUG = true;private boolean mIsEnabled = true;public AIManagerService(final Context context) {Slog.d(TAG, "AIManagerService()");mContext = context;}public void handleOnBootPhase() {Slog.d(TAG, "handleOnBootPhase");}@Overridepublic void stopAudioData() throws RemoteException {Slog.d(TAG, "stopAudioData!\n");}@Overridepublic int getWakeupDoa() throws RemoteException {return 0;}@Overridepublic byte[] getAudioData() throws RemoteException {return null;}@Overridepublic void wakeupAppStarted(String callerPackage) throws RemoteException {Slog.d(TAG, "wakeupAppStarted caller=" + callerPackage);return;}@Overridepublic boolean setEnabled(boolean enabled, String callerPackage) throws RemoteException {Slog.d(TAG, "setEnabled=" + enabled + ",caller=" + callerPackage);return false;}@Overridepublic boolean isEnabled(String callerPackage) throws RemoteException {Slog.d(TAG, "isEnabled=" + mIsEnabled + ",caller=" + callerPackage);return mIsEnabled;}@Overridepublic boolean isRecording(String callerPackage) throws RemoteException {return false;}@Overrideprotected void dump(FileDescriptor fd, PrintWriter pw, String[] args) {if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.DUMP)!= PERMISSION_GRANTED) {pw.println("Permission Denial: can't dump ovum_ai from from pid="+ Binder.getCallingPid() + ", uid=" + Binder.getCallingUid()+ " without permission " + android.Manifest.permission.DUMP);return;}pw.println("AIManagerService");}}
这里我们为了方便统一管理我们增加的自定义系统服务
在frameworks/base/services/core/java/com/android/server/目录下新增ovum/OvumOvulationService.java ，实现OvumOvulationService 并继承SystemService
package com.android.server.ovum;import android.content.Context;import android.util.Slog;import com.android.server.am.ActivityManagerService;import com.android.server.SystemService;public class OvumOvulationService extends SystemService {private final static String TAG = "OvumOvulationService";private Context mContext;private AIManagerService mAiManagerService;public OvumOvulationService(Context context) {super(context);mContext = context;mAiManagerService = new AIManagerService(context);}@Overridepublic void onStart() {Slog.d(TAG, "onStart ------");}@Overridepublic void onBootPhase(int phase) {Slog.d(TAG, "onBootPhase ------ " + phase);if (phase == SystemService.PHASE_SYSTEM_SERVICES_READY) {} else if (phase == SystemService.PHASE_BOOT_COMPLETED) {publishBinderService(Context.OVUM_AI_SERVICE, mAiManagerService);mAiManagerService.handleOnBootPhase();}}}
修改frameworks/base/services/java/com/android/server/SystemServer.java 实现启动我们的服务
import com.android.server.ovum.OvumOvulationService;private OvumOvulationService mOvumOvulationService;...mSystemServiceManager.startService(OvumOvulationService.class);
同时修改frameworks/base/core/java/android/content/Context.java 新增 OVUM_AI_SERVICE，方便dump信息查看
/*** @hide*/ public static final String OVUM_AI_SERVICE = "ovum_ai";
修改system/sepolicy/service_contexts文件，修改权限
ovum_aiu:object_r:ovum_service:s0
这样整个系统服务就声明和实现完成了。编译替换后，重启系统我们就可以看到system log了
01-11 01:53:29.183742 708 708 D AIManagerService: AIManagerService()01-11 01:53:29.184836 708 708 D OvumOvulationService: onStart ------01-01 00:00:01.628209 708 748 D OvumOvulationService: onBootPhase ------ 100001-01 00:00:01.628901 708 748 D AIManagerService: handleOnBootPhase
说明我们的服务正常起来了
2.使用自定义系统服务
这里我们不做注册监听系统服务这些操作，直接通过反射并封装一个jar包提供给应用使用，这里直接使用反射的方式。
public class AIManager {private static final String TAG = "AIManager.jar";private static final boolean DEBUG = true;private static AIManager sAIManager;private static Object mSysAIManagerObject;private static Class mSysAIManagerClass;private static Method mMethodSwitchToWakeupMode;private static Method mMethodSwitchToRecordMode;private static Method mMethodWakeupAppStarted;private static Method mMethodOneshotRecordStarted0;private static Method mMethodOneshotRecordStarted;private static Method mMethodSetEnabled;private static Method mMethodIsEnabled;private static Method mMethodIsRecording;private static Method mMethodCallback;private static Method mMethodUnCallback;private static Method mMethodgetAudioData;private static Method mMethodgetWakeupDoa;private static Method mMethodstopAudiodata;private static Method mMethodauthDuiTest;public AIManager(Context context) {if (DEBUG) {Log.d(TAG, "new AIManager from package " + context.getPackageName());}}public static AIManager getInstance(Context context) {if (sAIManager == null) {sAIManager = new AIManager(context);mSysAIManagerObject = context.getApplicationContext().getSystemService("ovum_ai");if (DEBUG) {Log.d(TAG, "mSysAIManagerObject=" + mSysAIManagerObject);}if (mSysAIManagerObject != null) {mSysAIManagerClass = mSysAIManagerObject.getClass();}try {mMethodSetEnabled = mSysAIManagerClass.getMethod("setEnabled", boolean.class);mMethodSetEnabled.setAccessible(true);} catch (NoSuchMethodException e) {Log.e(TAG, e.getMessage());}try {mMethodIsEnabled = mSysAIManagerClass.getMethod("isEnabled");mMethodIsEnabled.setAccessible(true);} catch (NoSuchMethodException e) {Log.e(TAG, e.getMessage());}try {mMethodIsRecording = mSysAIManagerClass.getMethod("isRecording");mMethodIsRecording.setAccessible(true);} catch (NoSuchMethodException e) {Log.e(TAG, e.getMessage());}try {mMethodgetAudioData = mSysAIManagerClass.getMethod("getAudioData");mMethodgetAudioData.setAccessible(true);} catch (NoSuchMethodException e) {Log.e(TAG, e.getMessage());}try {mMethodgetWakeupDoa = mSysAIManagerClass.getMethod("getWakeupDoa");mMethodgetWakeupDoa.setAccessible(true);} catch (NoSuchMethodException e) {Log.e(TAG, e.getMessage());}try {mMethodstopAudiodata = mSysAIManagerClass.getMethod("stopAudioData");mMethodstopAudiodata.setAccessible(true);} catch (NoSuchMethodException e) {Log.e(TAG, e.getMessage());}}return sAIManager;}public void stopAudiodata() {if (sAIManager == null || mMethodstopAudiodata == null || mSysAIManagerObject == null)return;try {mMethodstopAudiodata.invoke(mSysAIManagerObject);} catch (IllegalAccessException e) {e.printStackTrace();} catch (IllegalArgumentException e) {e.printStackTrace();} catch (InvocationTargetException e) {e.printStackTrace();}}public byte[] getAudioData() {if (sAIManager == null || mMethodgetAudioData == null || mSysAIManagerObject == null)return null;try {return (byte[]) mMethodgetAudioData.invoke(mSysAIManagerObject);} catch (IllegalAccessException e) {e.printStackTrace();} catch (IllegalArgumentException e) {e.printStackTrace();} catch (InvocationTargetException e) {e.printStackTrace();}return null;}public int getWakeupDoa() {if (sAIManager == null) return -1;try {return (int) mMethodgetWakeupDoa.invoke(mSysAIManagerObject);} catch (IllegalAccessException e) {e.printStackTrace();} catch (IllegalArgumentException e) {e.printStackTrace();} catch (InvocationTargetException e) {e.printStackTrace();}return -1;}public void wakeupAppStarted() {if (sAIManager == null) return;try {mMethodWakeupAppStarted.invoke(mSysAIManagerObject);} catch (IllegalAccessException e) {e.printStackTrace();} catch (IllegalArgumentException e) {e.printStackTrace();} catch (InvocationTargetException e) {e.printStackTrace();}}public boolean setEnabled(boolean enabled) {if (sAIManager == null) return false;try {return (boolean) mMethodSetEnabled.invoke(mSysAIManagerObject, enabled);} catch (IllegalAccessException e) {e.printStackTrace();} catch (IllegalArgumentException e) {e.printStackTrace();} catch (InvocationTargetException e) {e.printStackTrace();}return false;}public boolean isEnabled() {if (sAIManager == null) return false;try {return (boolean) mMethodIsEnabled.invoke(mSysAIManagerObject);} catch (IllegalAccessException e) {e.printStackTrace();} catch (IllegalArgumentException e) {e.printStackTrace();} catch (InvocationTargetException e) {e.printStackTrace();}return false;}public boolean isRecording() {if (sAIManager == null) return false;try {return (boolean) mMethodIsRecording.invoke(mSysAIManagerObject);} catch (IllegalAccessException e) {e.printStackTrace();} catch (IllegalArgumentException e) {e.printStackTrace();} catch (InvocationTargetException e) {e.printStackTrace();}return false;}}
应用只需要集成jar包，然后如下这样调用就可以了
AIManager.getInstance(MainActivity.this).setEnabled(true);
