import android.os.IBinder; //导入方法依赖的package包/类
/**
* 获取已注册服务的IBinder对象,前提是该服务是静态服务,即默认一直存在,或者自己已经启动并且向我们注册过;
* 注意不能通过此借口获取一个插件的服务,除非明确知道该插件的服务已经主动注册过,否则使用getPluginService()
*
* @param context
* @param serviceName 请求获取的service名称
* @return 所请求的service实现对象
*/
public static IBinder getService(Context context, String serviceName) {
if (DEBUG) {
Log.d(TAG, "[getService] begin = " + SystemClock.elapsedRealtime());
}
IBinder service = null;
/**
* 先考虑本地缓存
*/
SoftReference ref = sCache.get(serviceName);
if (ref != null) {
service = ref.get();
if (service != null) {
if (service.isBinderAlive() && service.pingBinder()) {
if (DEBUG) {
Log.d(TAG, "[getService] Found service from cache: " + serviceName);
Log.d(TAG, "[getService] end = " + SystemClock.elapsedRealtime());
}
return service;
} else {
sCache.remove(serviceName);
}
}
}
IServiceChannel serviceChannel = getServerChannel(context);
if (serviceChannel == null) {
return null;
}
try {
service = serviceChannel.getService(serviceName);
if (service != null) {
if (DEBUG) {
Log.d(TAG, "[getService] Found service from remote service channel: " + serviceName);
}
service = ServiceWrapper.factory(context, serviceName, service);
sCache.put(serviceName, new SoftReference(service));
}
} catch (RemoteException e) {
if (DEBUG) {
Log.e(TAG, "[getService] Error when getting service from service channel...", e);
}
}
if (DEBUG) {
Log.d(TAG, "[getService] end = " + SystemClock.elapsedRealtime());
}
return service;
}