PowerUI: poll thermal sensor in handler

Fixes: 120037422
Bug: 116866524
Test: adb logcat |grep SystemUIBootTiming
Change-Id: I2b76aa43bb093a884080809ef0f984de65ce4729

packages/SystemUI/src/com/android/systemui/power/PowerUI.java

@@ -411,13 +411,8 @@ public class PowerUI extends SystemUI {
 
         setNextLogTime();
 
-        // This initialization method may be called on a configuration change. Only one set of
-        // ongoing callbacks should be occurring, so remove any now. updateTemperatureWarning will
-        // schedule an ongoing callback.
-        mHandler.removeCallbacks(mUpdateTempCallback);
-
         // We have passed all of the checks, start checking the temp
-        updateTemperatureWarning();
+        mHandler.post(mUpdateTempCallback);
     }
 
     private void showThermalShutdownDialog() {
@@ -448,6 +443,8 @@ public class PowerUI extends SystemUI {
 
         logTemperatureStats();
 
+        // Remove any pending callbacks as we only want to enable one
+        mHandler.removeCallbacks(mUpdateTempCallback);
         mHandler.postDelayed(mUpdateTempCallback, TEMPERATURE_INTERVAL);
     }
 
@@ -553,11 +550,7 @@ public class PowerUI extends SystemUI {
     // Thermal event received from vendor thermal management subsystem
     private final class ThermalEventListener extends IThermalEventListener.Stub {
         @Override public void notifyThrottling(Temperature temp) {
-            // Trigger an update of the temperature warning.  Only one
-            // callback can be enabled at a time, so remove any existing
-            // callback; updateTemperatureWarning will schedule another one.
-            mHandler.removeCallbacks(mUpdateTempCallback);
-            updateTemperatureWarning();
+            mHandler.post(mUpdateTempCallback);
         }
     }
 }

packages/SystemUI/tests/src/com/android/systemui/power/PowerUITest.java

@@ -37,6 +37,7 @@ import android.os.PowerManager;
 import android.provider.Settings;
 import android.test.suitebuilder.annotation.SmallTest;
 import android.testing.AndroidTestingRunner;
+import android.testing.TestableLooper;
 import android.testing.TestableLooper.RunWithLooper;
 import android.testing.TestableResources;
 
@@ -127,6 +128,8 @@ public class PowerUITest extends SysuiTestCase {
         resources.addOverride(R.integer.config_warningTemperature, 55);
 
         mPowerUI.start();
+        // Guarantees mHandler has processed all messages.
+        TestableLooper.get(this).processAllMessages();
         verify(mMockWarnings).showHighTemperatureWarning();
     }
 
@@ -139,6 +142,8 @@ public class PowerUITest extends SysuiTestCase {
         resources.addOverride(R.integer.config_warningTemperature, 55);
 
         mPowerUI.start();
+        // Guarantees mHandler has processed all messages.
+        TestableLooper.get(this).processAllMessages();
         verify(mMockWarnings).showHighTemperatureWarning();
     }