Add a warning message to the ASM toggle.

This trigger fires if ASM is not enabled by default for
the device and the toggle is only visible if the ASM visible
flag is enabled.

Bug: 30455784
Change-Id: Id6adf8a75dbd4290f042d743689a75f496efb0c9

src/com/android/settings/deletionhelper/ActivationWarningFragment.java

@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2016 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.deletionhelper;
+
+import android.app.AlertDialog;
+import android.app.Dialog;
+import android.app.DialogFragment;
+import android.content.DialogInterface;
+import android.os.Bundle;
+import com.android.settings.R;
+
+/**
+ * Fragment to warn the user about activating the storage manager.
+ */
+public class ActivationWarningFragment extends DialogFragment {
+    public static final String TAG = "ActivationWarningFragment";
+
+    public static ActivationWarningFragment newInstance() {
+        return new ActivationWarningFragment();
+    }
+
+    @Override
+    public Dialog onCreateDialog(Bundle savedInstanceState) {
+        return new AlertDialog.Builder(getActivity())
+                .setMessage(R.string.automatic_storage_manager_activation_warning)
+                .setPositiveButton(android.R.string.ok, null)
+                .create();
+    }
+
+}