Merge "Speed up dev options"

res/xml/development_settings.xml

@@ -23,7 +23,7 @@
         android:key="memory"
         android:icon="@drawable/ic_settings_memory"
         android:title="@string/memory_settings_title"
-        android:summary="@string/summary_empty"
+        android:summary="@string/summary_placeholder"
         android:fragment="com.android.settings.applications.ProcessStatsSummary" />
 
     <com.android.settings.BugreportPreference

src/com/android/settings/dashboard/DashboardFragment.java

@@ -87,10 +87,12 @@ public abstract class DashboardFragment extends SettingsPreferenceFragment
         // Set ComparisonCallback so we get better animation when list changes.
         getPreferenceManager().setPreferenceComparisonCallback(
                 new PreferenceManager.SimplePreferenceComparisonCallback());
+        if (icicle != null) {
             // Upon rotation configuration change we need to update preference states before any
             // editing dialog is recreated (that would happen before onResume is called).
             updatePreferenceStates();
         }
+    }
 
     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container,

src/com/android/settings/development/MemoryUsagePreferenceController.java

@@ -27,6 +27,7 @@ import com.android.settings.applications.ProcStatsData;
 import com.android.settings.applications.ProcessStatsBase;
 import com.android.settings.core.PreferenceControllerMixin;
 import com.android.settingslib.development.DeveloperOptionsPreferenceController;
+import com.android.settingslib.utils.ThreadUtils;
 
 public class MemoryUsagePreferenceController extends DeveloperOptionsPreferenceController implements
         PreferenceControllerMixin {
@@ -56,14 +57,19 @@ public class MemoryUsagePreferenceController extends DeveloperOptionsPreferenceC
 
     @Override
     public void updateState(Preference preference) {
+        // This is posted on the background thread to speed up fragment launch time for dev options
+        // mProcStasData.refreshStats(true) takes ~20ms to run.
+        ThreadUtils.postOnBackgroundThread(() -> {
             mProcStatsData.refreshStats(true);
             final ProcStatsData.MemInfo memInfo = mProcStatsData.getMemInfo();
             final String usedResult = Formatter.formatShortFileSize(mContext,
                     (long) memInfo.realUsedRam);
             final String totalResult = Formatter.formatShortFileSize(mContext,
                     (long) memInfo.realTotalRam);
-        mPreference.setSummary(mContext.getString(R.string.memory_summary,
+            ThreadUtils.postOnMainThread(
-                usedResult, totalResult));
+                    () -> mPreference.setSummary(mContext.getString(R.string.memory_summary,
+                            usedResult, totalResult)));
+        });
     }
 
     @VisibleForTesting

tests/robotests/src/com/android/settings/development/MemoryUsagePreferenceControllerTest.java

@@ -30,6 +30,7 @@ import android.support.v7.preference.PreferenceScreen;
 import com.android.settings.TestConfig;
 import com.android.settings.applications.ProcStatsData;
 import com.android.settings.testutils.SettingsRobolectricTestRunner;
+import com.android.settings.testutils.shadow.ShadowThreadUtils;
 
 import org.junit.Before;
 import org.junit.Test;
@@ -68,6 +69,9 @@ public class MemoryUsagePreferenceControllerTest {
     }
 
     @Test
+    @Config(shadows = {
+            ShadowThreadUtils.class
+    })
     public void updateState_shouldUpdatePreferenceSummary() {
         mController.updateState(mPreference);