Annotate threads for some IME handling methods

This is a preparation to work on Bug 36897707.

For instance, the reason why most of IME-related callbacks in
InputMethodService get called on the main thread is because
IInputMethodWrapper keeps forwarding incoming IPCs into the
main looper of the IME process as follows:

  InputMethodManagerService (IMMS)
        ------
    -> one-way binder IPCs over	IInputMethod
        ------
      -> IInputMethodWrapper (on the binder thread(s))
       -> Handler (to dispatch tasks to main thread)
        -> InputMethodImpl.* (on the main thread)
         -> InputMethodService.* (on the main thread)

By adding explicit annotations such as @BinderThread and @MainThread
in relevant methods, this CL makes that kind of investigation much
easier than before.

Bug: 36897707
Test: compile
Change-Id: I8f9afe9a1986a9fa41fb66fdc64e8f0f67e45c2e

1 files changed, 4 insertions, 0 deletions

diff --git a/core/java/android/inputmethodservice/AbstractInputMethodService.java b/core/java/android/inputmethodservice/AbstractInputMethodService.java
index 29177b6b47cf..185215a5ce75 100644
--- a/core/java/android/inputmethodservice/AbstractInputMethodService.java
+++ b/core/java/android/inputmethodservice/AbstractInputMethodService.java
@@ -16,6 +16,7 @@
 
 package android.inputmethodservice;
 
+import android.annotation.MainThread;
 import android.annotation.NonNull;
 import android.app.Service;
 import android.content.Intent;
@@ -62,6 +63,7 @@ public abstract class AbstractInputMethodService extends Service
          * back to {@link AbstractInputMethodService#onCreateInputMethodSessionInterface()
          * AbstractInputMethodService.onCreateInputMethodSessionInterface()}.
          */
+        @MainThread
         public void createSession(SessionCallback callback) {
             callback.sessionCreated(onCreateInputMethodSessionInterface());
         }
@@ -71,6 +73,7 @@ public abstract class AbstractInputMethodService extends Service
          * {@link AbstractInputMethodSessionImpl#revokeSelf()
          * AbstractInputMethodSessionImpl.setEnabled()} method.
          */
+        @MainThread
         public void setSessionEnabled(InputMethodSession session, boolean enabled) {
             ((AbstractInputMethodSessionImpl)session).setEnabled(enabled);
         }
@@ -80,6 +83,7 @@ public abstract class AbstractInputMethodService extends Service
          * {@link AbstractInputMethodSessionImpl#revokeSelf()
          * AbstractInputMethodSessionImpl.revokeSelf()} method.
          */
+        @MainThread
         public void revokeSession(InputMethodSession session) {
             ((AbstractInputMethodSessionImpl)session).revokeSelf();
         }