Update low battery notification mechanism

 - Update warning and severe trigger percentage
 - Update low battery notification trigger condition to fixed value instead of remaining time
 - Update low battery notification text
 - Update start saver confirmation notification text
 - Use severe low battery dialog if available
 Screenshot: https://screenshot.googleplex.com/iZt43YU6fHQPNpy.png

Bug: 207470943
Bug: 209932572
Test: atest SystemUITests
Change-Id: I851e635e748a5315f9780a1344c2068cda14d95e

6 files changed, 49 insertions, 41 deletions

diff --git a/core/res/res/values/config.xml b/core/res/res/values/config.xml
index 5ac30de631c5..c2cb57d84b34 100644
--- a/core/res/res/values/config.xml
+++ b/core/res/res/values/config.xml
@@ -1207,13 +1207,13 @@
 
     <!-- Display low battery warning when battery level dips to this value.
          Also, the battery stats are flushed to disk when we hit this level.  -->
-    <integer name="config_criticalBatteryWarningLevel">5</integer>
+    <integer name="config_criticalBatteryWarningLevel">10</integer>
 
     <!-- Shutdown if the battery temperature exceeds (this value * 0.1) Celsius. -->
     <integer name="config_shutdownBatteryTemperature">680</integer>
 
     <!-- Display low battery warning when battery level dips to this value -->
-    <integer name="config_lowBatteryWarningLevel">15</integer>
+    <integer name="config_lowBatteryWarningLevel">20</integer>
 
     <!-- The default suggested battery % at which we enable battery saver automatically.  -->
     <integer name="config_lowBatteryAutoTriggerDefaultLevel">15</integer>
diff --git a/packages/SystemUI/res/values/config.xml b/packages/SystemUI/res/values/config.xml
index 178f93ae3c93..3ed217007081 100644
--- a/packages/SystemUI/res/values/config.xml
+++ b/packages/SystemUI/res/values/config.xml
@@ -482,6 +482,9 @@
      space -->
     <bool name="config_showBatteryEstimateQSBH">false</bool>
 
+    <!-- Whether to show a severe low battery dialog. -->
+    <bool name="config_severe_battery_dialog">false</bool>
+
     <!-- A path similar to frameworks/base/core/res/res/values/config.xml
       config_mainBuiltInDisplayCutout that describes a path larger than the exact path of a display
       cutout. If present as well as config_enableDisplayCutoutProtection is set to true, then
diff --git a/packages/SystemUI/res/values/strings.xml b/packages/SystemUI/res/values/strings.xml
index df16b0d45228..27e188674006 100644
--- a/packages/SystemUI/res/values/strings.xml
+++ b/packages/SystemUI/res/values/strings.xml
@@ -21,7 +21,13 @@
     <string name="app_label">System UI</string>
 
     <!-- When the battery is low, this is displayed to the user in a dialog.  The title of the low battery alert.  [CHAR LIMIT=NONE]-->
-    <string name="battery_low_title">Battery may run out soon</string>
+    <string name="battery_low_title">Turn on Battery Saver?</string>
+
+    <!-- When the battery is low, this is displayed to the user in a dialog.  The description of the low battery alert.  [CHAR LIMIT=NONE]-->
+    <string name="battery_low_description">You have <xliff:g id="percentage" example="20%">%s</xliff:g> battery left. Battery Saver turns on Dark theme, restricts background activity, and delays notifications.</string>
+
+    <!-- When the battery is low at first time, this is displayed to the user in a dialog.  The description of the low battery alert.  [CHAR LIMIT=NONE]-->
+    <string name="battery_low_intro">Battery Saver turns on Dark theme, restricts background activity, and delays notifications.</string>
 
     <!-- A message that appears when the battery level is getting low in a dialog.  This is
         appended to the subtitle of the low battery alert.  "percentage" is the percentage of battery
diff --git a/packages/SystemUI/src/com/android/systemui/power/PowerNotificationWarnings.java b/packages/SystemUI/src/com/android/systemui/power/PowerNotificationWarnings.java
index dbd641bffe7e..039c33315741 100644
--- a/packages/SystemUI/src/com/android/systemui/power/PowerNotificationWarnings.java
+++ b/packages/SystemUI/src/com/android/systemui/power/PowerNotificationWarnings.java
@@ -118,6 +118,8 @@ public class PowerNotificationWarnings implements PowerUI.WarningsUI {
     private static final String ACTION_AUTO_SAVER_NO_THANKS =
             "PNW.autoSaverNoThanks";
 
+    private static final String ACTION_ENABLE_SEVERE_BATTERY_DIALOG = "PNW.enableSevereDialog";
+
     private static final String SETTINGS_ACTION_OPEN_BATTERY_SAVER_SETTING =
             "android.settings.BATTERY_SAVER_SETTINGS";
     public static final String BATTERY_SAVER_SCHEDULE_SCREEN_INTENT_ACTION =
@@ -253,20 +255,25 @@ public class PowerNotificationWarnings implements PowerUI.WarningsUI {
     }
 
     protected void showWarningNotification() {
-        final String percentage = NumberFormat.getPercentInstance()
-                .format((double) mCurrentBatterySnapshot.getBatteryLevel() / 100.0);
-
-        // get shared standard notification copy
-        String title = mContext.getString(R.string.battery_low_title);
-        String contentText;
-
-        // get correct content text if notification is hybrid or not
-        if (mCurrentBatterySnapshot.isHybrid()) {
-            contentText = getHybridContentString(percentage);
-        } else {
-            contentText = mContext.getString(R.string.battery_low_percent_format, percentage);
+        if (showSevereLowBatteryDialog()) {
+            mContext.sendBroadcast(new Intent(ACTION_ENABLE_SEVERE_BATTERY_DIALOG)
+                    .setPackage(mContext.getPackageName())
+                    .addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY
+                            | Intent.FLAG_RECEIVER_FOREGROUND));
+            // Reset the state once dialog been enabled
+            dismissLowBatteryNotification();
+            mPlaySound = false;
+            return;
         }
 
+        final int warningLevel = mContext.getResources().getInteger(
+                com.android.internal.R.integer.config_lowBatteryWarningLevel);
+        final String percentage = NumberFormat.getPercentInstance()
+                .format((double) warningLevel / 100.0);
+        final String title = mContext.getString(R.string.battery_low_title);
+        final String contentText = mContext.getString(
+                R.string.battery_low_description, percentage);
+
         final Notification.Builder nb =
                 new Notification.Builder(mContext, NotificationChannels.BATTERY)
                         .setSmallIcon(R.drawable.ic_power_low)
@@ -284,7 +291,7 @@ public class PowerNotificationWarnings implements PowerUI.WarningsUI {
         }
         // Make the notification red if the percentage goes below a certain amount or the time
         // remaining estimate is disabled
-        if (!mCurrentBatterySnapshot.isHybrid() || mBucket < 0
+        if (!mCurrentBatterySnapshot.isHybrid() || mBucket < -1
                 || mCurrentBatterySnapshot.getTimeRemainingMillis()
                         < mCurrentBatterySnapshot.getSevereThresholdMillis()) {
             nb.setColor(Utils.getColorAttrDefaultColor(mContext, android.R.attr.colorError));
@@ -303,6 +310,13 @@ public class PowerNotificationWarnings implements PowerUI.WarningsUI {
         mNoMan.notifyAsUser(TAG_BATTERY, SystemMessage.NOTE_POWER_LOW, n, UserHandle.ALL);
     }
 
+    private boolean showSevereLowBatteryDialog() {
+        final boolean isSevereState = !mCurrentBatterySnapshot.isHybrid() || mBucket < -1;
+        final boolean useSevereDialog = mContext.getResources().getBoolean(
+                R.bool.config_severe_battery_dialog);
+        return isSevereState && useSevereDialog;
+    }
+
     private void showAutoSaverSuggestionNotification() {
         final CharSequence message = mContext.getString(R.string.auto_saver_text);
         final Notification.Builder nb =
@@ -662,8 +676,7 @@ public class PowerNotificationWarnings implements PowerUI.WarningsUI {
 
         // If there's no link, use the string with no "learn more".
         if (TextUtils.isEmpty(learnMoreUrl)) {
-            return mContext.getText(
-                    com.android.internal.R.string.battery_saver_description);
+            return mContext.getText(R.string.battery_low_intro);
         }
 
         // If we have a link, use the string with the "learn more" link.
diff --git a/packages/SystemUI/src/com/android/systemui/power/PowerUI.java b/packages/SystemUI/src/com/android/systemui/power/PowerUI.java
index 642af593c211..81ec5844f4ac 100644
--- a/packages/SystemUI/src/com/android/systemui/power/PowerUI.java
+++ b/packages/SystemUI/src/com/android/systemui/power/PowerUI.java
@@ -69,7 +69,7 @@ public class PowerUI extends CoreStartable implements CommandQueue.Callbacks {
     private static final long TEMPERATURE_LOGGING_INTERVAL = DateUtils.HOUR_IN_MILLIS;
     private static final int MAX_RECENT_TEMPS = 125; // TEMPERATURE_LOGGING_INTERVAL plus a buffer
     static final long THREE_HOURS_IN_MILLIS = DateUtils.HOUR_IN_MILLIS * 3;
-    private static final int CHARGE_CYCLE_PERCENT_RESET = 45;
+    private static final int CHARGE_CYCLE_PERCENT_RESET = 30;
     private static final long SIX_HOURS_MILLIS = Duration.ofHours(6).toMillis();
     public static final int NO_ESTIMATE_AVAILABLE = -1;
     private static final String BOOT_COUNT_KEY = "boot_count";
@@ -206,7 +206,8 @@ public class PowerUI extends CoreStartable implements CommandQueue.Callbacks {
      *
      * 1 means that the battery is "ok"
      * 0 means that the battery is between "ok" and what we should warn about.
-     * less than 0 means that the battery is low
+     * less than 0 means that the battery is low, -1 means the battery is reaching warning level,
+     * -2 means the battery is reaching severe level.
      */
     private int findBatteryLevelBucket(int level) {
         if (level >= mLowBatteryAlertCloseLevel) {
@@ -388,12 +389,8 @@ public class PowerUI extends CoreStartable implements CommandQueue.Callbacks {
     @VisibleForTesting
     void maybeShowHybridWarning(BatteryStateSnapshot currentSnapshot,
             BatteryStateSnapshot lastSnapshot) {
-        // if we are now over 45% battery & 6 hours remaining so we can trigger hybrid
-        // notification again
-        final long timeRemainingMillis = currentSnapshot.getTimeRemainingMillis();
-        if (currentSnapshot.getBatteryLevel() >= CHARGE_CYCLE_PERCENT_RESET
-                && (timeRemainingMillis > SIX_HOURS_MILLIS
-                || timeRemainingMillis == NO_ESTIMATE_AVAILABLE)) {
+        // if we are now over 30% battery, we can trigger hybrid notification again
+        if (currentSnapshot.getBatteryLevel() >= CHARGE_CYCLE_PERCENT_RESET) {
             mLowWarningShownThisChargeCycle = false;
             mSevereWarningShownThisChargeCycle = false;
             if (DEBUG) {
@@ -403,6 +400,7 @@ public class PowerUI extends CoreStartable implements CommandQueue.Callbacks {
 
         final boolean playSound = currentSnapshot.getBucket() != lastSnapshot.getBucket()
                 || lastSnapshot.getPlugged();
+        final long timeRemainingMillis = currentSnapshot.getTimeRemainingMillis();
 
         if (shouldShowHybridWarning(currentSnapshot)) {
             mWarnings.showLowBatteryWarning(playSound);
@@ -444,19 +442,13 @@ public class PowerUI extends CoreStartable implements CommandQueue.Callbacks {
             return false;
         }
 
-        final long timeRemainingMillis = snapshot.getTimeRemainingMillis();
         // Only show the low warning if enabled once per charge cycle & no battery saver
-        final boolean canShowWarning = snapshot.isLowWarningEnabled()
-                && !mLowWarningShownThisChargeCycle && !snapshot.isPowerSaver()
-                && ((timeRemainingMillis != NO_ESTIMATE_AVAILABLE
-                && timeRemainingMillis < snapshot.getLowThresholdMillis())
-                || snapshot.getBatteryLevel() <= snapshot.getLowLevelThreshold());
+        final boolean canShowWarning = !mLowWarningShownThisChargeCycle && !snapshot.isPowerSaver()
+                && snapshot.getBatteryLevel() <= snapshot.getLowLevelThreshold();
 
         // Only show the severe warning once per charge cycle
         final boolean canShowSevereWarning = !mSevereWarningShownThisChargeCycle
-                && ((timeRemainingMillis != NO_ESTIMATE_AVAILABLE
-                && timeRemainingMillis < snapshot.getSevereThresholdMillis())
-                || snapshot.getBatteryLevel() <= snapshot.getSevereLevelThreshold());
+                && snapshot.getBatteryLevel() <= snapshot.getSevereLevelThreshold();
 
         final boolean canShow = canShowWarning || canShowSevereWarning;
 
diff --git a/packages/SystemUI/tests/src/com/android/systemui/power/PowerUITest.java b/packages/SystemUI/tests/src/com/android/systemui/power/PowerUITest.java
index 721809c83cd8..533048abd6df 100644
--- a/packages/SystemUI/tests/src/com/android/systemui/power/PowerUITest.java
+++ b/packages/SystemUI/tests/src/com/android/systemui/power/PowerUITest.java
@@ -430,12 +430,6 @@ public class PowerUITest extends SysuiTestCase {
         state.mIsPowerSaver = true;
         shouldShow = mPowerUI.shouldShowHybridWarning(state.get());
         assertThat(shouldShow).isFalse();
-
-        state.mIsPowerSaver = false;
-        // if disabled we should not show the low warning.
-        state.mIsLowLevelWarningEnabled = false;
-        shouldShow = mPowerUI.shouldShowHybridWarning(state.get());
-        assertThat(shouldShow).isFalse();
     }
 
     @Test