From cc1e9f7ce76d6c1e6d721a398fe8ae8a882243bb Mon Sep 17 00:00:00 2001
From: Jorim Jaggi <jjaggi@google.com>
Date: Tue, 8 Sep 2015 14:56:40 -0700
Subject: [PATCH] Add double-tap power button to open camera 2/2

Bug: 23787555
Change-Id: I04787cd863212b1ed9608a6c8bd02af13273b387
---
 res/values/strings.xml                        |  5 +++
 res/xml/display_settings.xml                  |  6 ++++
 src/com/android/settings/DisplaySettings.java | 34 ++++++++++++++++++-
 3 files changed, 44 insertions(+), 1 deletion(-)

diff --git a/res/values/strings.xml b/res/values/strings.xml
index f693b71b2a2..6e2986e2e2e 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -6995,4 +6995,9 @@
     <!-- Description of setting that controls gesture to open camera [CHAR LIMIT=NONE] -->
     <string name="camera_gesture_desc">Open the camera app by twisting your wrist twice</string>
 
+    <!-- Title of setting that controls gesture to open camera by double tapping the power button [CHAR LIMIT=40] -->
+    <string name="camera_double_tap_power_gesture_title">Press power button twice for camera</string>
+
+    <!-- Description of setting that controls gesture to open camera by double tapping the power button [CHAR LIMIT=NONE] -->
+    <string name="camera_double_tap_power_gesture_desc">Quickly open camera without unlocking your screen</string>
 </resources>
diff --git a/res/xml/display_settings.xml b/res/xml/display_settings.xml
index b5157e48bff..7150150251e 100644
--- a/res/xml/display_settings.xml
+++ b/res/xml/display_settings.xml
@@ -63,6 +63,12 @@
                 android:summary="@string/camera_gesture_desc"
                 android:persistent="false" />
 
+        <SwitchPreference
+                android:key="camera_double_tap_power_gesture"
+                android:title="@string/camera_double_tap_power_gesture_title"
+                android:summary="@string/camera_double_tap_power_gesture_desc"
+                android:persistent="false" />
+
         <PreferenceScreen
                 android:key="screensaver"
                 android:title="@string/screensaver_settings_title"
diff --git a/src/com/android/settings/DisplaySettings.java b/src/com/android/settings/DisplaySettings.java
index d2daac8f667..de15d4cc64e 100644
--- a/src/com/android/settings/DisplaySettings.java
+++ b/src/com/android/settings/DisplaySettings.java
@@ -22,6 +22,7 @@ import com.android.settings.DropDownPreference.Callback;
 import com.android.settings.search.BaseSearchIndexProvider;
 import com.android.settings.search.Indexable;
 
+import static android.provider.Settings.Secure.CAMERA_DOUBLE_TAP_POWER_GESTURE_DISABLED;
 import static android.provider.Settings.Secure.CAMERA_GESTURE_DISABLED;
 import static android.provider.Settings.Secure.DOUBLE_TAP_TO_WAKE;
 import static android.provider.Settings.Secure.DOZE_ENABLED;
@@ -76,6 +77,8 @@ public class DisplaySettings extends SettingsPreferenceFragment implements
     private static final String KEY_AUTO_ROTATE = "auto_rotate";
     private static final String KEY_NIGHT_MODE = "night_mode";
     private static final String KEY_CAMERA_GESTURE = "camera_gesture";
+    private static final String KEY_CAMERA_DOUBLE_TAP_POWER_GESTURE
+            = "camera_double_tap_power_gesture";
 
     private static final int DLG_GLOBAL_CHANGE_WARNING = 1;
 
@@ -91,6 +94,7 @@ public class DisplaySettings extends SettingsPreferenceFragment implements
     private SwitchPreference mTapToWakePreference;
     private SwitchPreference mAutoBrightnessPreference;
     private SwitchPreference mCameraGesturePreference;
+    private SwitchPreference mCameraDoubleTapPowerGesturePreference;
 
     @Override
     protected int getMetricsCategory() {
@@ -159,6 +163,14 @@ public class DisplaySettings extends SettingsPreferenceFragment implements
             removePreference(KEY_CAMERA_GESTURE);
         }
 
+        if (isCameraDoubleTapPowerGestureAvailable(getResources())) {
+            mCameraDoubleTapPowerGesturePreference
+                    = (SwitchPreference) findPreference(KEY_CAMERA_DOUBLE_TAP_POWER_GESTURE);
+            mCameraDoubleTapPowerGesturePreference.setOnPreferenceChangeListener(this);
+        } else {
+            removePreference(KEY_CAMERA_DOUBLE_TAP_POWER_GESTURE);
+        }
+
         if (RotationPolicy.isRotationLockToggleVisible(activity)) {
             DropDownPreference rotatePreference =
                     (DropDownPreference) findPreference(KEY_AUTO_ROTATE);
@@ -241,6 +253,11 @@ public class DisplaySettings extends SettingsPreferenceFragment implements
                 !SystemProperties.getBoolean("gesture.disable_camera_launch", false);
     }
 
+    private static boolean isCameraDoubleTapPowerGestureAvailable(Resources res) {
+        return res.getBoolean(
+                com.android.internal.R.bool.config_cameraDoubleTapPowerGestureEnabled);
+    }
+
     private void updateTimeoutPreferenceDescription(long currentTimeout) {
         ListPreference preference = mScreenTimeoutPreference;
         String summary;
@@ -388,11 +405,18 @@ public class DisplaySettings extends SettingsPreferenceFragment implements
             mTapToWakePreference.setChecked(value != 0);
         }
 
-        // Update camera gesture if it is available.
+        // Update camera gesture #1 if it is available.
         if (mCameraGesturePreference != null) {
             int value = Settings.Secure.getInt(getContentResolver(), CAMERA_GESTURE_DISABLED, 0);
             mCameraGesturePreference.setChecked(value == 0);
         }
+
+        // Update camera gesture #2 if it is available.
+        if (mCameraDoubleTapPowerGesturePreference != null) {
+            int value = Settings.Secure.getInt(
+                    getContentResolver(), CAMERA_DOUBLE_TAP_POWER_GESTURE_DISABLED, 0);
+            mCameraDoubleTapPowerGesturePreference.setChecked(value == 0);
+        }
     }
 
     private void updateScreenSaverSummary() {
@@ -453,6 +477,11 @@ public class DisplaySettings extends SettingsPreferenceFragment implements
             Settings.Secure.putInt(getContentResolver(), CAMERA_GESTURE_DISABLED,
                     value ? 0 : 1 /* Backwards because setting is for disabling */);
         }
+        if (preference == mCameraDoubleTapPowerGesturePreference) {
+            boolean value = (Boolean) objValue;
+            Settings.Secure.putInt(getContentResolver(), CAMERA_DOUBLE_TAP_POWER_GESTURE_DISABLED,
+                    value ? 0 : 1 /* Backwards because setting is for disabling */);
+        }
         if (preference == mNightModePreference) {
             try {
                 final int value = Integer.parseInt((String) objValue);
@@ -524,6 +553,9 @@ public class DisplaySettings extends SettingsPreferenceFragment implements
                     if (!isCameraGestureAvailable(context.getResources())) {
                         result.add(KEY_CAMERA_GESTURE);
                     }
+                    if (!isCameraDoubleTapPowerGestureAvailable(context.getResources())) {
+                        result.add(KEY_CAMERA_DOUBLE_TAP_POWER_GESTURE);
+                    }
                     return result;
                 }
             };