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

方法

• allowBlocking

  198     /**
  199      * Allow blocking calls on the given interface, overriding the requested
  200      * value of {@link #setWarnOnBlocking(boolean)}.
  201      * <p>
  202      * This should only be rarely called when you are <em>absolutely sure</em>
  203      * the remote interface is a built-in system component that can never be
  204      * upgraded. In particular, this <em>must never</em> be called for
  205      * interfaces hosted by package that could be upgraded or replaced,
  206      * otherwise you risk system instability if that remote interface wedges.
  207      *
  208      * @hide
  209      */
  210     public static IBinder allowBlocking(IBinder binder) {
  211         try {
  212             if (binder instanceof BinderProxy) {
  213                 ((BinderProxy) binder).mWarnOnBlocking = false;
  214             } else if (binder != null && binder.getInterfaceDescriptor() != null
  215                     && binder.queryLocalInterface(binder.getInterfaceDescriptor()) == null) {
  216                 Log.w(TAG, "Unable to allow blocking on interface " + binder);
  217             }
  218         } catch (RemoteException ignored) {
  219         }
  220         return binder;
  221     }