Service and KitchenSink logic to read the kernel's input event queues

This patch provides a native service that can manually be built, installed to a device, and launched, e.g.

sh# /system/bin/com.android.car.keventreader /dev/input/event*

The service will monitor the files provided as input (expecting them to be kernel input queues in the format
described at, e.g. https://github.com/torvalds/linux/blob/master/include/uapi/linux/input.h), and generate
events upon reading EV_KEY events from each such file.

The patch also includes a KitchenSink hook to talk to the native service and receive key events from it.

Bug: 78258802
Test: manual on Mojave
Change-Id: If7f2f1f72e4dc6a26cd9d32b31e90e494d55650b
Merged-In: If7f2f1f72e4dc6a26cd9d32b31e90e494d55650b

3 files changed, 57 insertions, 1 deletions

diff --git a/tests/EmbeddedKitchenSinkApp/Android.mk b/tests/EmbeddedKitchenSinkApp/Android.mk
index 3c04fd514c..7a8c1459a6 100644
--- a/tests/EmbeddedKitchenSinkApp/Android.mk
+++ b/tests/EmbeddedKitchenSinkApp/Android.mk
@@ -47,7 +47,8 @@ LOCAL_STATIC_ANDROID_LIBRARIES += \
 LOCAL_STATIC_JAVA_LIBRARIES += \
     android.hidl.base-V1.0-java \
     android.hardware.automotive.vehicle-V2.0-java \
-    vehicle-hal-support-lib
+    vehicle-hal-support-lib \
+    com.android.car.keventreader-client
 
 include packages/services/Car/car-support-lib/car-support.mk
 
diff --git a/tests/EmbeddedKitchenSinkApp/res/layout/input_test.xml b/tests/EmbeddedKitchenSinkApp/res/layout/input_test.xml
index 1d9f3178da..03a90e080f 100644
--- a/tests/EmbeddedKitchenSinkApp/res/layout/input_test.xml
+++ b/tests/EmbeddedKitchenSinkApp/res/layout/input_test.xml
@@ -24,4 +24,21 @@
             android:id="@+id/input_buttons">
         <!-- Filled at runtime. -->
     </LinearLayout>
+    <ScrollView
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_weight="1"
+        android:layout_marginLeft="15dp"
+        android:layout_marginRight="15dp"
+        android:layout_marginTop="20dp"
+        android:fillViewport="true">
+        <TextView
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:gravity="bottom"
+                android:scrollbars="vertical"
+                android:textSize="24px"
+                android:typeface="monospace"
+                android:id="@+id/events_list"/>
+    </ScrollView>
 </LinearLayout>
diff --git a/tests/EmbeddedKitchenSinkApp/src/com/google/android/car/kitchensink/input/InputTestFragment.java b/tests/EmbeddedKitchenSinkApp/src/com/google/android/car/kitchensink/input/InputTestFragment.java
index ff6ef21c55..4b9ec1d25b 100644
--- a/tests/EmbeddedKitchenSinkApp/src/com/google/android/car/kitchensink/input/InputTestFragment.java
+++ b/tests/EmbeddedKitchenSinkApp/src/com/google/android/car/kitchensink/input/InputTestFragment.java
@@ -30,6 +30,7 @@ import android.hardware.automotive.vehicle.V2_0.VehiclePropertyType;
 import android.os.Bundle;
 import android.os.RemoteException;
 import android.support.v4.app.Fragment;
+import android.text.method.ScrollingMovementMethod;
 import android.util.Log;
 import android.view.KeyEvent;
 import android.view.LayoutInflater;
@@ -40,6 +41,12 @@ import android.widget.LinearLayout;
 import android.widget.TextView;
 import android.widget.Toast;
 
+import android.support.v4.app.Fragment;
+
+import com.android.car.keventreader.EventReaderService;
+import com.android.car.keventreader.IEventCallback;
+import com.android.car.keventreader.KeypressEvent;
+
 import com.google.android.car.kitchensink.R;
 import com.google.android.collect.Lists;
 
@@ -67,6 +74,25 @@ public class InputTestFragment extends Fragment {
 
     private IVehicle mVehicle;
 
+    private EventReaderService mEventReaderService;
+
+    private final IEventCallback.Stub mKeypressEventHandler = new IEventCallback.Stub() {
+        private String prettyPrint(KeypressEvent event) {
+            return String.format("Event{source = %s, keycode = %s, key%s}\n",
+                event.source,
+                event.keycodeToString(),
+                event.isKeydown ? "down" : "up");
+        }
+
+        @Override
+        public void onEvent(KeypressEvent keypressEvent) throws RemoteException {
+            Log.d(TAG, "received event " + keypressEvent);
+            mInputEventsList.append(prettyPrint(keypressEvent));
+        }
+    };
+
+    private TextView mInputEventsList;
+
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -79,6 +105,12 @@ public class InputTestFragment extends Fragment {
             throw new RuntimeException("Failed to connect to IVehicle");
         }
         Log.d(TAG, "Connected to IVehicle service: " + mVehicle);
+
+        mEventReaderService = EventReaderService.tryGet();
+        Log.d(TAG, "Key Event Reader service: " + mEventReaderService);
+        if (mEventReaderService != null) {
+            mEventReaderService.registerCallback(mKeypressEventHandler);
+        }
     }
 
     @Nullable
@@ -87,6 +119,9 @@ public class InputTestFragment extends Fragment {
             @Nullable Bundle savedInstanceState) {
         View view = inflater.inflate(R.layout.input_test, container, false);
 
+        mInputEventsList = view.findViewById(R.id.events_list);
+        mInputEventsList.setMovementMethod(new ScrollingMovementMethod());
+
         TextView steeringWheelLabel = new TextView(getActivity() /*context*/);
         steeringWheelLabel.setText(R.string.steering_wheel);
         steeringWheelLabel.setTextSize(getResources().getDimension(R.dimen.car_title2_size));
@@ -161,6 +196,9 @@ public class InputTestFragment extends Fragment {
     public void onDestroyView() {
         super.onDestroyView();
         mButtons.clear();
+        if (mEventReaderService != null) {
+            mEventReaderService.unregisterCallback(mKeypressEventHandler);
+        }
     }
 
     private void addButtonsToPanel(LinearLayout root, List<View> buttons) {