android startService onStartCommand 多次回调
* Request that a given application service be started. The Intent
* should contain either contain the complete class name of a specific service
* implementation to start or a specific package name to target. If the
* Intent is less specified, it log a warning about this and which of the
* multiple matching services it finds and uses will be undefined. If this service
* is not already running, it will be instantiated and started (creating a
* process for it if needed); if it is running then it remains running.
*
*
Every call to this method will result in a corresponding call to
* the target service's {@link android.app.Service#onStartCommand} method,
* with the intent given here. This provides a convenient way
* to submit jobs to a service without having to bind and call on to its
* interface.
*
*
Using startService() overrides the default service lifetime that is
* managed by {@link #bindService}: it requires the service to remain
* running until {@link #stopService} is called, regardless of whether
* any clients are connected to it. Note that calls to startService()
* are not nesting: no matter how many times you call startService(),
* a single call to {@link #stopService} will stop it.
*
*
The system attempts to keep running services around as much as
* possible. The only time they should be stopped is if the current
* foreground application is using so many resources that the service needs
* to be killed. If any errors happen in the service's process, it will
* automatically be restarted.
*
*
This function will throw {@link SecurityException} if you do not
* have permission to start the given service.
*
* @param service Identifies the service to be started. The Intent must be either
* fully explicit (supplying a component name) or specify a specific package
* name it is targetted to. Additional values
* may be included in the Intent extras to supply arguments along with
* this specific start call.
*
* @return If the service is being started or is already running, the
* {@link ComponentName} of the actual service that was started is
* returned; else if the service does not exist null is returned.
*
* @throws SecurityException
*
* @see #stopService
* @see #bindService
*/
public abstract ComponentName startService(Intent service);
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