Fix 4560303: Add setting to lock later when power button pressed

This adds a feature to delay locking the device when the power button
is pressed.  This fixes a use case where the user wants to turn off
the display (e.g. to save power) but doesn't want to lock the device.

Change-Id: I711a81c3e79f7accdc1d9cb217b7806a0b8fcf63
diff --git a/res/values/strings.xml b/res/values/strings.xml
index 9a29122..90b1446 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -2226,6 +2226,8 @@
     <string name="lockpattern_settings_enable_visible_pattern_title">Make pattern visible</string>
     <!-- Security & location settings screen, setting check box title. This setting controls whether tactile feedback will be produced when the user draws the pattern.-->
     <string name="lockpattern_settings_enable_tactile_feedback_title">Vibrate on touch</string>
+    <!-- Security & location settings screen, setting check box title. This controls whether the device locks immediately when the power button is pressed. [CHAR LIMIT=28]-->
+    <string name="lockpattern_settings_enable_power_button_instantly_locks">Power button instantly locks</string>
     <!-- Security & location settings screen, setting option name when user has never set an unlock pattern -->
     <string name="lockpattern_settings_choose_lock_pattern">Set unlock pattern</string>
     <!-- Security & location settings screen, setting option name when user has previously set an unlock pattern and wants to change to a new pattern -->
diff --git a/res/xml/security_settings_biometric_weak.xml b/res/xml/security_settings_biometric_weak.xml
index 7d832e4..080fbc9 100644
--- a/res/xml/security_settings_biometric_weak.xml
+++ b/res/xml/security_settings_biometric_weak.xml
@@ -43,6 +43,10 @@
             android:persistent="false"/>
 
         <CheckBoxPreference
+            android:key="power_button_instantly_locks"
+            android:title="@string/lockpattern_settings_enable_power_button_instantly_locks"/>
+
+        <CheckBoxPreference
             android:key="unlock_tactile_feedback"
             android:title="@string/lockpattern_settings_enable_tactile_feedback_title"/>
 
diff --git a/res/xml/security_settings_password.xml b/res/xml/security_settings_password.xml
index 9ddc18e..0e9c71d 100644
--- a/res/xml/security_settings_password.xml
+++ b/res/xml/security_settings_password.xml
@@ -34,6 +34,10 @@
             android:entryValues="@array/lock_after_timeout_values"
             android:persistent="false"/>
 
+        <CheckBoxPreference
+            android:key="power_button_instantly_locks"
+            android:title="@string/lockpattern_settings_enable_power_button_instantly_locks"/>
+
         <PreferenceScreen
             android:fragment="com.android.settings.OwnerInfoSettings"
             android:key="owner_info_settings"
diff --git a/res/xml/security_settings_pattern.xml b/res/xml/security_settings_pattern.xml
index 4cfc360..b91b2b6 100644
--- a/res/xml/security_settings_pattern.xml
+++ b/res/xml/security_settings_pattern.xml
@@ -39,6 +39,10 @@
             android:persistent="false"/>
 
         <CheckBoxPreference
+            android:key="power_button_instantly_locks"
+            android:title="@string/lockpattern_settings_enable_power_button_instantly_locks"/>
+
+        <CheckBoxPreference
             android:key="unlock_tactile_feedback"
             android:title="@string/lockpattern_settings_enable_tactile_feedback_title"/>
 
diff --git a/res/xml/security_settings_pin.xml b/res/xml/security_settings_pin.xml
index 0c8ff97..4562a9a 100644
--- a/res/xml/security_settings_pin.xml
+++ b/res/xml/security_settings_pin.xml
@@ -35,6 +35,10 @@
             android:persistent="false"/>
 
         <CheckBoxPreference
+            android:key="power_button_instantly_locks"
+            android:title="@string/lockpattern_settings_enable_power_button_instantly_locks"/>
+
+        <CheckBoxPreference
             android:key="unlock_tactile_feedback"
             android:title="@string/lockpattern_settings_enable_tactile_feedback_title"/>
 
diff --git a/src/com/android/settings/SecuritySettings.java b/src/com/android/settings/SecuritySettings.java
index 7ca5815..adf8c37 100644
--- a/src/com/android/settings/SecuritySettings.java
+++ b/src/com/android/settings/SecuritySettings.java
@@ -66,6 +66,7 @@
     private static final String KEY_SHOW_PASSWORD = "show_password";
     private static final String KEY_RESET_CREDENTIALS = "reset_credentials";
     private static final String KEY_TOGGLE_INSTALL_APPLICATIONS = "toggle_install_applications";
+    private static final String KEY_POWER_INSTANTLY_LOCKS = "power_button_instantly_locks";
 
     DevicePolicyManager mDPM;
 
@@ -82,6 +83,7 @@
 
     private CheckBoxPreference mToggleAppInstallation;
     private DialogInterface mWarnInstallApps;
+    private CheckBoxPreference mPowerButtonInstantlyLocks;
 
     @Override
     public void onCreate(Bundle savedInstanceState) {
@@ -156,6 +158,10 @@
         // visible pattern
         mVisiblePattern = (CheckBoxPreference) root.findPreference(KEY_VISIBLE_PATTERN);
 
+        // lock instantly on power key press
+        mPowerButtonInstantlyLocks = (CheckBoxPreference) root.findPreference(
+                KEY_POWER_INSTANTLY_LOCKS);
+
         // don't display visible pattern if biometric and backup is not pattern
         if (resid == R.xml.security_settings_biometric_weak &&
                 mLockPatternUtils.getKeyguardStoredPasswordQuality() !=
@@ -322,6 +328,9 @@
         if (mTactileFeedback != null) {
             mTactileFeedback.setChecked(lockPatternUtils.isTactileFeedbackEnabled());
         }
+        if (mPowerButtonInstantlyLocks != null) {
+            mPowerButtonInstantlyLocks.setChecked(lockPatternUtils.getPowerButtonInstantlyLocks());
+        }
 
         mShowPassword.setChecked(Settings.System.getInt(getContentResolver(),
                 Settings.System.TEXT_SHOW_PASSWORD, 1) != 0);
@@ -351,6 +360,8 @@
             lockPatternUtils.setVisiblePatternEnabled(isToggled(preference));
         } else if (KEY_TACTILE_FEEDBACK_ENABLED.equals(key)) {
             lockPatternUtils.setTactileFeedbackEnabled(isToggled(preference));
+        } else if (KEY_POWER_INSTANTLY_LOCKS.equals(key)) {
+            lockPatternUtils.setPowerButtonInstantlyLocks(isToggled(preference));
         } else if (preference == mShowPassword) {
             Settings.System.putInt(getContentResolver(), Settings.System.TEXT_SHOW_PASSWORD,
                     mShowPassword.isChecked() ? 1 : 0);