Android 在MyService.java的onCreated（）块中调用getIntent（）'；行不通

在具有Intent参数的onStartCommand中调用Intent Intent。但是为什么在没有intent参数的onCreate中不调用intent呢。您能告诉我如何在onCreate中调用没有意图的意图吗 参数

MainActivity.java 点击公共作废按钮（视图五）{

MyService.java 公共类MyService扩展服务{

@Override
public void onCreate() {

Activity ac = new Activity();
Intent intent = ac.getIntent();

if(intent != null) {
    Log.d("MyService", "intent exists");
} else {
    Log.d("MyService", "intent doesn't exist");
}

super.onCreate();
}

=>日志中不存在“意图”

@Override
public int onStartCommand(Intent intent, int flags, int startId) {

    if(intent != null) {
        Log.d("MyService", "intent exists");
    } else {
        Log.d("MyService", "intent doesn't exist");
    }

    return super.onStartCommand(intent, flags, startId);
}

=>日志中存在“意图”

将其添加到manifest.xml文件中

@Override
public int onStartCommand(Intent intent, int flags, int startId) {

    if(intent != null) {
        Log.d("MyService", "intent exists");
    } else {
        Log.d("MyService", "intent doesn't exist");
    }

    return super.onStartCommand(intent, flags, startId);
}

<service android:name=".Your_Service_NAme" />