Android13 Context startService流程分析

Context的startService用于启动服务，代码如下：

//frameworks/base/core/java/android/content/Context.java
public abstract class Context {
    @Nullable
    public abstract ComponentName startService(Intent service);
}

Context是抽象类，由其子类ContextImpl实现：

//frameworks/base/core/java/android/content/ContextImpl.java
class ContextImpl extends Context {
    @Override
    public ComponentName startService(Intent service) {
        warnIfCallingFromSystemProcess();
        return startServiceCommon(service, false, mUser);
    }
}

调用startServiceCommon方法：

//frameworks/base/core/java/android/content/ContextImpl.java
class ContextImpl extends Context {
    final @NonNull ActivityThread mMainThread;
    private ComponentName startServiceCommon(Intent service, boolean requireForeground,
            UserHandle user) {
        try {
            validateServiceIntent(servic