Use shouldOfferSwitchingToNextInputMethod when available

With this CL, LatinIME starts using
InputMethodManager#shouldOfferSwitchingToNextInputMethod when
available and API level is higher than 19 (KitKat).

Note that relevant settings of LatinIME will be ignored if
InputMethodManager#shouldOfferSwitchingToNextInputMethod is
considered to be available at the moment. We will revisit
here to reorganize the user visible settings before the
new global IME switching mechanism becomes publicly
available.

BUG: 12965588
Change-Id: I0188fa56cba8e983c61cef3ae3400a0e3821f718

1 files changed, 11 insertions, 0 deletions

diff --git a/java/src/com/android/inputmethod/compat/InputMethodManagerCompatWrapper.java b/java/src/com/android/inputmethod/compat/InputMethodManagerCompatWrapper.java
index a80c3fefe..18b3a6060 100644
--- a/java/src/com/android/inputmethod/compat/InputMethodManagerCompatWrapper.java
+++ b/java/src/com/android/inputmethod/compat/InputMethodManagerCompatWrapper.java
@@ -28,6 +28,12 @@ public final class InputMethodManagerCompatWrapper {
     private static final Method METHOD_switchToNextInputMethod = CompatUtils.getMethod(
             InputMethodManager.class, "switchToNextInputMethod", IBinder.class, Boolean.TYPE);
 
+    // Note that InputMethodManager.shouldOfferSwitchingToNextInputMethod() has been introduced
+    // in API level 19 (Build.VERSION_CODES.KITKAT).
+    private static final Method METHOD_shouldOfferSwitchingToNextInputMethod =
+            CompatUtils.getMethod(InputMethodManager.class,
+                    "shouldOfferSwitchingToNextInputMethod", IBinder.class);
+
     public final InputMethodManager mImm;
 
     public InputMethodManagerCompatWrapper(final Context context) {
@@ -38,4 +44,9 @@ public final class InputMethodManagerCompatWrapper {
         return (Boolean)CompatUtils.invoke(mImm, false /* defaultValue */,
                 METHOD_switchToNextInputMethod, token, onlyCurrentIme);
     }
+
+    public boolean shouldOfferSwitchingToNextInputMethod(final IBinder token) {
+        return (Boolean)CompatUtils.invoke(mImm, false /* defaultValue */,
+                METHOD_shouldOfferSwitchingToNextInputMethod, token);
+    }
 }