源码位置：frameworks/base/core/java/android/os/ServiceManagerNative.java

继承关系

public abstract class ServiceManagerNative extends Binder implements IServiceManager

方法

• asInterface

  30     /**
  31      * Cast a Binder object into a service manager interface, generating
  32      * a proxy if needed.
  33      */
  34     @UnsupportedAppUsage
  35     static public IServiceManager asInterface(IBinder obj)
  36     {
  37         if (obj == null) {
  38             return null;
  39         }
  40         IServiceManager in =
  41             (IServiceManager)obj.queryLocalInterface(descriptor);
  42         if (in != null) {
  43             return in;
  44         }
  45 
  46         return new ServiceManagerProxy(obj);
  47     }