violet: Implement keyhandler for fingerprint shutter

* Prevents fp from triggering other events such as
   vibrate on long press

Fixes: 7b74e3d8fef912c35f6d48f69c951af290414d73 ("keylayout: Redirect keycode 96 to CAMERA")
Co-authored-by: Adithya R <gh0strider.2k18.reborn@gmail.com>
Signed-off-by: Adithya R <gh0strider.2k18.reborn@gmail.com>
Signed-off-by: Joker-V2 <nipinna0@gmail.com>

device.mk

@@ -286,6 +286,10 @@ PRODUCT_PACKAGES += \
 PRODUCT_COPY_FILES += \
     $(LOCAL_PATH)/configs/sec_config:$(TARGET_COPY_OUT_VENDOR)/etc/sec_config
 
+# Keyhandler
+PRODUCT_PACKAGES += \
+    KeyHandler
+
 # Keylayouts
 PRODUCT_COPY_FILES += \
     $(LOCAL_PATH)/configs/keylayout/sm6150-idp-snd-card_Button_Jack.kl:$(TARGET_COPY_OUT_SYSTEM)/usr/keylayout/sm6150-idp-snd-card_Button_Jack.kl \

keyhandler/Android.bp

@@ -0,0 +1,19 @@
+//
+// Copyright (C) 2021 WaveOS
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
+android_app {
+    name: "KeyHandler",
+
+    srcs: ["src/**/*.java"],
+
+    certificate: "platform",
+    platform_apis: true,
+    privileged: true,
+
+    optimize: {
+        proguard_flags_files: ["proguard.flags"],
+    },
+}

keyhandler/AndroidManifest.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+     Copyright (C) 2021 WaveOS
+     SPDX-License-Identifier: Apache-2.0
+-->
+
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+          android:sharedUserId="android.uid.system"
+          package="me.superioros.keyhandler" />

keyhandler/proguard.flags

@@ -0,0 +1,4 @@
+# Keep keyhandler constructor
+-keep public class * implements com.android.internal.os.DeviceKeyHandler {
+    public <init>(android.content.Context);
+}

keyhandler/src/me/superioros/keyhandler/KeyHandler.java

@@ -0,0 +1,77 @@
+/*
+ * Copyright (C) 2021 WaveOS
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package me.superioros.keyhandler;
+
+import android.app.ActivityManager;
+import android.content.Context;
+import android.content.pm.ActivityInfo;
+import android.content.pm.PackageManager;
+import android.view.KeyEvent;
+import android.util.Log;
+
+import com.android.internal.os.DeviceKeyHandler;
+
+import java.util.List;
+
+public class KeyHandler implements DeviceKeyHandler {
+
+    private static final int FP_SCANCODE = 96;
+    private static final int FP_KEYCODE = KeyEvent.KEYCODE_CAMERA;
+    private static final String MIUI_CAMERA_PACKAGE_NAME = "com.android.camera";
+
+    private static final String TAG = "KeyHandler";
+    private static final boolean DEBUG = false;
+
+    private static ActivityManager am;
+    private static PackageManager pm;
+
+    public KeyHandler(Context context) {
+        am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
+        pm = context.getPackageManager();
+    }
+
+    public KeyEvent handleKeyEvent(KeyEvent event) {
+        int keyCode = event.getKeyCode();
+        int scanCode = event.getScanCode();
+        int action = event.getAction();
+
+        if (DEBUG)
+            Log.i(TAG, String.format("Received event keyCode=%d scanCode=%d action=%d", keyCode, scanCode, action));
+
+        if (keyCode == FP_KEYCODE && scanCode == FP_SCANCODE) {
+            if (action != KeyEvent.ACTION_DOWN) {
+                return null;
+            }
+            ActivityInfo runningActivity = getRunningActivityInfo();
+            if (runningActivity != null && runningActivity.packageName.equals(MIUI_CAMERA_PACKAGE_NAME)) {
+                if (DEBUG) Log.i(TAG, "Miui camera running, returning event");
+                return event;
+            } else {
+                if (DEBUG) Log.i(TAG, "Miui camera not running, returning null");
+                return null;
+            }
+        }
+
+        return event;
+    }
+
+    private static ActivityInfo getRunningActivityInfo() {
+        List<ActivityManager.RunningTaskInfo> tasks = am.getRunningTasks(1);
+
+        if (tasks != null && !tasks.isEmpty()) {
+            ActivityManager.RunningTaskInfo top = tasks.get(0);
+            try {
+                return pm.getActivityInfo(top.topActivity, 0);
+            } catch (PackageManager.NameNotFoundException e) {
+                // Do nothing
+            }
+        }
+
+        return null;
+    }
+
+}

overlay/frameworks/base/core/res/res/values/config.xml

@@ -519,4 +519,14 @@
 
     <!-- Pocket Lock -->
     <bool name="config_pocketModeSupported">true</bool>
+
+    <!-- Paths to the libraries that contain device specific key handlers -->
+    <string-array name="config_deviceKeyHandlerLibs" translatable="false">
+        <item>/system/priv-app/KeyHandler/KeyHandler.apk</item>
+    </string-array>
+
+    <!-- Names of the key handler classes -->
+    <string-array name="config_deviceKeyHandlerClasses" translatable="false">
+        <item>me.superioros.keyhandler.KeyHandler</item>
+    </string-array>
 </resources>