Hide automatic storage manager preference.

This preference should not be displayed to lower RAM device. Files
Go app will would provide this feature for low RAM devices.
Bug: 63333197
Test: visual

Change-Id: I48464884cf20acc632748e66f8183c276996828c

src/com/android/settings/deviceinfo/storage/AutomaticStorageManagementSwitchPreferenceController.java

@@ -16,13 +16,13 @@
 
 package com.android.settings.deviceinfo.storage;
 
+import android.app.ActivityManager;
 import android.app.FragmentManager;
 import android.content.Context;
 import android.os.SystemProperties;
 import android.provider.Settings;
 import android.support.annotation.VisibleForTesting;
 import android.support.v7.preference.PreferenceScreen;
-
 import com.android.internal.logging.nano.MetricsProto.MetricsEvent;
 import com.android.settings.core.PreferenceControllerMixin;
 import com.android.settings.core.instrumentation.MetricsFeatureProvider;
@@ -61,7 +61,7 @@ public class AutomaticStorageManagementSwitchPreferenceController extends
 
     @Override
     public boolean isAvailable() {
-        return true;
+        return !ActivityManager.isLowRamDeviceStatic();
     }
 
     @Override
@@ -71,6 +71,9 @@ public class AutomaticStorageManagementSwitchPreferenceController extends
 
     @Override
     public void onResume() {
+        if (!isAvailable()) {
+            return;
+        }
         boolean isStorageManagerEnabled = Settings.Secure.getInt(mContext.getContentResolver(),
                 Settings.Secure.AUTOMATIC_STORAGE_MANAGER_ENABLED, 0) != 0;
         mSwitch.setChecked(isStorageManagerEnabled);

tests/robotests/src/com/android/settings/deviceinfo/storage/AutomaticStorageManagementSwitchPreferenceControllerTest.java

@@ -17,7 +17,6 @@
 package com.android.settings.deviceinfo.storage;
 
 import static com.google.common.truth.Truth.assertThat;
-
 import static org.mockito.Matchers.any;
 import static org.mockito.Matchers.eq;
 import static org.mockito.Mockito.mock;
@@ -33,17 +32,15 @@ import android.content.Context;
 import android.provider.Settings;
 import android.support.v7.preference.Preference;
 import android.support.v7.preference.PreferenceScreen;
-
 import com.android.internal.logging.nano.MetricsProto.MetricsEvent;
-import com.android.settings.testutils.SettingsRobolectricTestRunner;
 import com.android.settings.TestConfig;
 import com.android.settings.core.instrumentation.MetricsFeatureProvider;
 import com.android.settings.deletionhelper.ActivationWarningFragment;
+import com.android.settings.overlay.FeatureFactory;
 import com.android.settings.testutils.FakeFeatureFactory;
+import com.android.settings.testutils.SettingsRobolectricTestRunner;
 import com.android.settings.testutils.shadow.SettingsShadowSystemProperties;
 import com.android.settings.widget.MasterSwitchPreference;
-import com.android.settings.overlay.FeatureFactory;
-
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
@@ -84,10 +81,18 @@ public class AutomaticStorageManagementSwitchPreferenceControllerTest {
     }
 
     @Test
-    public void isAvailable_shouldAlwaysReturnTrue() {
+    public void isAvailable_shouldReturnTrue_forHighRamDevice() {
         assertThat(mController.isAvailable()).isTrue();
     }
 
+    @Test
+    @Config(shadows = {SettingsShadowSystemProperties.class})
+    public void isAvailable_shouldAlwaysReturnFalse_forLowRamDevice() {
+        SettingsShadowSystemProperties.set("ro.config.low_ram", "true");
+        assertThat(mController.isAvailable()).isFalse();
+        SettingsShadowSystemProperties.clear();
+    }
+
     @Test
     public void onResume_shouldReflectEnabledStatus() {
         mController.displayPreference(mScreen);