Convert encryption status to preference controller

- Move Crypt/Encryption setting into security package.
- Reformat crypt_keeper_settings.xml
- Add controller and test for encryption status

Bug: 32953042
Test: robotests
Change-Id: I1f4b2f97133435c70a49522a59886ac4da6759af

src/com/android/settings/security/EncryptionStatusPreferenceController.java

@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.security;
+
+import android.content.Context;
+import android.os.UserManager;
+import android.support.v7.preference.Preference;
+
+import com.android.internal.widget.LockPatternUtils;
+import com.android.settings.R;
+import com.android.settings.core.PreferenceControllerMixin;
+import com.android.settingslib.core.AbstractPreferenceController;
+
+public class EncryptionStatusPreferenceController extends AbstractPreferenceController
+        implements PreferenceControllerMixin {
+
+    private static final String PREF_KEY = "encryption_and_credentials_encryption_status";
+
+    private final UserManager mUserManager;
+
+    public EncryptionStatusPreferenceController(Context context) {
+        super(context);
+        mUserManager = (UserManager) context.getSystemService(Context.USER_SERVICE);
+    }
+
+    @Override
+    public boolean isAvailable() {
+        return mUserManager.isAdminUser();
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return PREF_KEY;
+    }
+
+    @Override
+    public void updateState(Preference preference) {
+        final boolean encryptionEnabled = LockPatternUtils.isDeviceEncryptionEnabled();
+        if (encryptionEnabled) {
+            preference.setFragment(null);
+            preference.setSummary(R.string.crypt_keeper_encrypted_summary);
+        } else {
+            preference.setFragment(CryptKeeperSettings.class.getName());
+            preference.setSummary(R.string.summary_placeholder);
+        }
+    }
+}