Merge "Introduce FileEncryptionPreferenceController"

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

@@ -252,7 +252,7 @@ public class DevelopmentSettingsDashboardFragment extends RestrictedDashboardFra
         controllers.add(new BluetoothSnoopLogPreferenceController(context));
         controllers.add(new OemUnlockPreferenceController(context, activity, fragment));
         // running services
-        // convert to file encryption
+        controllers.add(new FileEncryptionPreferenceController(context));
         controllers.add(new PictureColorModePreferenceController(context, lifecycle));
         controllers.add(new WebViewAppPreferenceControllerV2(context));
         controllers.add(new CoolColorTemperaturePreferenceController(context));

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

@@ -0,0 +1,105 @@
+/*
+ * 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.development;
+
+import android.content.Context;
+import android.os.RemoteException;
+import android.os.ServiceManager;
+import android.os.SystemProperties;
+import android.os.storage.IStorageManager;
+import android.support.annotation.VisibleForTesting;
+import android.support.v7.preference.Preference;
+import android.support.v7.preference.PreferenceScreen;
+import android.text.TextUtils;
+
+import com.android.settings.R;
+
+public class FileEncryptionPreferenceController extends DeveloperOptionsPreferenceController {
+
+    private static final String KEY_CONVERT_FBE = "convert_to_file_encryption";
+    private static final String KEY_STORAGE_MANAGER = "mount";
+
+    @VisibleForTesting
+    static final String FILE_ENCRYPTION_PROPERTY_KEY = "ro.crypto.type";
+
+    private final IStorageManager mStorageManager;
+
+    private Preference mPreference;
+
+    public FileEncryptionPreferenceController(Context context) {
+        super(context);
+
+        mStorageManager = getStorageManager();
+    }
+
+    @Override
+    public boolean isAvailable() {
+        if (mStorageManager == null) {
+            return false;
+        }
+
+        try {
+            return mStorageManager.isConvertibleToFBE();
+        } catch (RemoteException e) {
+            return false;
+        }
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return KEY_CONVERT_FBE;
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        super.displayPreference(screen);
+
+        mPreference = screen.findPreference(getPreferenceKey());
+    }
+
+    @Override
+    public void updateState(Preference preference) {
+        if (!TextUtils.equals("file",
+                SystemProperties.get(FILE_ENCRYPTION_PROPERTY_KEY, "none" /* default */))) {
+            return;
+        }
+
+        mPreference.setEnabled(false);
+        mPreference.setSummary(
+                mContext.getResources().getString(R.string.convert_to_file_encryption_done));
+    }
+
+    @Override
+    protected void onDeveloperOptionsSwitchEnabled() {
+        // intentional no-op
+    }
+
+    @Override
+    protected void onDeveloperOptionsSwitchDisabled() {
+        // intentional no-op
+    }
+
+    private IStorageManager getStorageManager() {
+        try {
+            return IStorageManager.Stub.asInterface(
+                    ServiceManager.getService(KEY_STORAGE_MANAGER));
+        } catch (VerifyError e) {
+            // Used for tests since Robolectric cannot initialize this class.
+            return null;
+        }
+    }
+}