speech: Add #isOnDeviceRecognitionAvailable

Bug: 188055926
Test: CtsVoiceRecognitionTestCases
Change-Id: I6ba1d083005782beedb28313077af041af2ae975

2 files changed, 42 insertions, 2 deletions

diff --git a/core/api/current.txt b/core/api/current.txt
index bdc2c0ca5c93..f1241df85e41 100644
--- a/core/api/current.txt
+++ b/core/api/current.txt
@@ -39223,7 +39223,8 @@ package android.speech {
     method @MainThread public static android.speech.SpeechRecognizer createSpeechRecognizer(android.content.Context);
     method @MainThread public static android.speech.SpeechRecognizer createSpeechRecognizer(android.content.Context, android.content.ComponentName);
     method public void destroy();
-    method public static boolean isRecognitionAvailable(android.content.Context);
+    method public static boolean isOnDeviceRecognitionAvailable(@NonNull android.content.Context);
+    method public static boolean isRecognitionAvailable(@NonNull android.content.Context);
     method @MainThread public void setRecognitionListener(android.speech.RecognitionListener);
     method @MainThread public void startListening(android.content.Intent);
     method @MainThread public void stopListening();
diff --git a/core/java/android/speech/SpeechRecognizer.java b/core/java/android/speech/SpeechRecognizer.java
index b9920072271f..37a97ca719b1 100644
--- a/core/java/android/speech/SpeechRecognizer.java
+++ b/core/java/android/speech/SpeechRecognizer.java
@@ -40,6 +40,8 @@ import android.text.TextUtils;
 import android.util.Log;
 import android.util.Slog;
 
+import com.android.internal.R;
+
 import java.lang.annotation.Documented;
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
@@ -238,7 +240,7 @@ public class SpeechRecognizer {
      * @param context with which {@code SpeechRecognizer} will be created
      * @return {@code true} if recognition is available, {@code false} otherwise
      */
-    public static boolean isRecognitionAvailable(final Context context) {
+    public static boolean isRecognitionAvailable(@NonNull final Context context) {
         // TODO(b/176578753): make sure this works well with system speech recognizers.
         final List<ResolveInfo> list = context.getPackageManager().queryIntentServices(
                 new Intent(RecognitionService.SERVICE_INTERFACE), 0);
@@ -246,6 +248,38 @@ public class SpeechRecognizer {
     }
 
     /**
+     * Checks whether an on-device speech recognition service is available on the system. If this
+     * method returns {@code false},
+     * {@link SpeechRecognizer#createOnDeviceSpeechRecognizer(Context)} will
+     * fail.
+     *
+     * @param context with which on-device {@code SpeechRecognizer} will be created
+     * @return {@code true} if on-device recognition is available, {@code false} otherwise
+     */
+    public static boolean isOnDeviceRecognitionAvailable(@NonNull final Context context) {
+        ComponentName componentName =
+                ComponentName.unflattenFromString(
+                        context.getString(R.string.config_defaultOnDeviceSpeechRecognitionService));
+        if (componentName == null) {
+            return false;
+        }
+
+        List<ResolveInfo> resolveInfos =
+                context.getPackageManager().queryIntentServices(
+                        new Intent(RecognitionService.SERVICE_INTERFACE), 0);
+        if (resolveInfos == null) {
+            return false;
+        }
+
+        for (ResolveInfo ri : resolveInfos) {
+            if (ri.serviceInfo != null && componentName.equals(ri.serviceInfo.getComponentName())) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    /**
      * Factory method to create a new {@code SpeechRecognizer}. Please note that
      * {@link #setRecognitionListener(RecognitionListener)} should be called before dispatching any
      * command to the created {@code SpeechRecognizer}, otherwise no notifications will be
@@ -315,6 +349,8 @@ public class SpeechRecognizer {
      * notifications will be received.
      *
      * @param context in which to create {@code SpeechRecognizer}
+     * @throws UnsupportedOperationException iff {@link #isOnDeviceRecognitionAvailable(Context)}
+     * is false
      * @return a new on-device {@code SpeechRecognizer}.
      */
     @NonNull
@@ -324,6 +360,9 @@ public class SpeechRecognizer {
             throw new IllegalArgumentException("Context cannot be null");
         }
         checkIsCalledFromMainThread();
+        if (!isOnDeviceRecognitionAvailable(context)) {
+            throw new UnsupportedOperationException("On-device recognition is not available");
+        }
         return new SpeechRecognizer(context, /* onDevice */ true);
     }