1.添加自定义AIDL，定义接口
系统路径：frameworks/base/core/java/android/app/IHelloWorldManager.aidl
package android.app;
interface IHelloWorldManager{
boolean initD();
int addValD(in int a,in int b);
}
2.添加AIDL接口实现类
系统路径：frameworks/base/core/java/android/app/HelloWorldManagerService.java
package com.android.server;
import android.app.IHelloWorldManager;
import android.content.Context;
import android.os.RemoteException;
import android.util.Slog;
import android.annotation.Nullable;
// import com.android.server.SystemService;
public class HelloWorldManagerService extends IHelloWorldManager.Stub {
private static String TAG = "HelloWorldManagerService";
public HelloWorldManagerService(){
boolean result = init();
if(result){
Slog.d(TAG, "init success");
}else{
Slog.d(TAG, "init error");
}
Slog.d(TAG, "HelloWorldManagerService init result = " +addVal(3, 5));
}
@Override
@Nullable
public int addValD(int a, int b) throws RemoteException {
Slog.d(TAG, "add value - a=" + a + ", b=" + b);
return addVal(a, b);
}
@Override
@Nullable
public boolean initD() throws RemoteException {
Slog.d(TAG, " init success");
return init();
}
// public static final class Lifecycle extends SystemService {
// private final HelloWorldManagerService mService;
// public Lifecycle(Context context) {
// super(context);
// mService = new HelloWorldManagerService();
// Log.d(TAG, "Lifecycle create");
// }
// @Override
// public void onStart() {
// Log.d(TAG, "Lifecycle onStart start");
// publishBinderService(Context.HELLOWORLD_SERVICE, mService);
// Log.d(TAG, "Lifecycle onStart continue");
// mService.start();
// Log.d(TAG, "Lifecycle onStart end");
// }
// @Override
// public void onBootPhase(int phase) {
// }
// // @Override
// // public void onUserStopped(@NonNull TargetUser user) {
// // }
// public HelloWorldManagerService getService() {
// return mService;
// }
// }
// private void start() {
// }
private static native boolean init();
private static native int addVal(int a, int b);
}
3.添加接口管理类HelloWorldManager.java
系统路径：frameworks/base/core/java/android/app/HelloWorldManager.java
// HelloWorldManager.java
// HelloWorldManager.java
package android.app;
import android.annotation.SystemService;
import android.annotation.Nullable;
import android.content.Context;
import android.compat.annotation.UnsupportedAppUsage;
import android.os.IBinder;
import android.os.RemoteException;
import android.os.ServiceManager;
import android.util.Log;
import android.util.Singleton;
import android.util.Slog;
@SystemService(Context.HELLOWORLD_SERVICE)
public class HelloWorldManager {
private static String TAG = "HelloWorldManager";
/**
* @hide
*/
@UnsupportedAppUsage
public static IHelloWorldManager getService() {
return IHelloWorldManagerSingleton.get();
}
@UnsupportedAppUsage
private static final Singleton<IHelloWorldManager> IHelloWorldManagerSingleton = new Singleton<IHelloWorldManager>() {
@Override
protected IHelloWorldManager create() {
final IBinder b = ServiceManager.getService(Context.HELLOWORLD_SERVICE);
final IHelloWorldManager am = IHelloWorldManager.Stub.asInterface(b);
return am;
}
};
public int addVal(@Nullable int a, @Nullable int b) throws RemoteException {
Slog.d(TAG, "a + b = " + getService().addValD(3, 5));
return getService().addValD(a, b);
}
public boolean init() throws RemoteException{
return getService().initD();
}
/**
* @hide
*/
public HelloWorldManager() {
}
}
4.在Context.java类添加服务定义
系统路径：frameworks/base/core/java/android/content/Context.java
public static final String HELLOWORLD_SERVICE = "helloworld";
5.SystemServiceRegistry
系统路径：frameworks/base/core/java/android/app/SystemServiceRegistry.java
// 添加位置：
@SystemApi
public final class SystemServiceRegistry {
static {
// 添加内容如下
// 省略一万行
registerService(Context.HELLOWORLD_SERVICE, HelloWorldManager.class,
new CachedServiceFetcher<HelloWorldManager>() {
@Override
public HelloWorldManager createService(ContextImpl ctx) {
return new HelloWorldManager();
}});
// 以下省略一万行
}
}
6.SystemServer
系统路径：frameworks/base/services/java/com/android/server/SystemServer.java
// 添加位置：startOtherServices方法
// 添加内容如下
// 此处一定要记得捕获异常
t.traceBegin("StartHelloworldService");
try {
ServiceManager.addService(Context.HELLOWORLD_SERVICE,
new HelloWorldManagerService());
} catch (Throwable e) {
Slog.e(TAG, "Failure starting HelloworldService", e);
}
t.traceEnd();