Add activities to support voice settings.

Adds Voice Interaction Activities for:
- Do not disturb mode (with interaction)
- Battery Saver mode
- Airplane mode

Change-Id: I4480dc3a30975d94b71714ff58fbeebddfbc1c58

src/com/android/settings/utils/VoiceSettingsActivity.java

@@ -0,0 +1,74 @@
+/*
+ * Copyright (C) 2014 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.utils;
+
+import android.app.Activity;
+import android.app.VoiceInteractor;
+import android.app.VoiceInteractor.CompleteVoiceRequest;
+import android.content.Intent;
+import android.os.Bundle;
+import android.util.Log;
+
+/**
+ * Activity for modifying a setting using the Voice Interaction API. This activity
+ * will only allow modifying the setting if the intent was sent using
+ * {@link android.service.voice.VoiceInteractionSession#startVoiceActivity startVoiceActivity}
+ * by the current Voice Interaction Service.
+ */
+abstract public class VoiceSettingsActivity extends Activity {
+
+    private static final String TAG = "VoiceSettingsActivity";
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        if (isVoiceInteraction() || savedInstanceState == null) {
+            // Only permit if this is a voice interaction.
+            if (onVoiceSettingInteraction(getIntent())) {
+                // If it's complete, finish.
+                finish();
+            }
+        } else {
+            Log.v(TAG, "Cannot modify settings without voice interaction");
+            finish();
+        }
+    }
+
+    /**
+     * Modify the setting as a voice interaction. Should return true if the
+     * voice interaction is complete or false if more interaction is required.
+     */
+    abstract protected boolean onVoiceSettingInteraction(Intent intent);
+
+    /**
+     * Send a notification that the interaction was successful. If {@link prompt} is
+     * not null, then it will be read to the user.
+     */
+    protected void notifySuccess(CharSequence prompt) {
+        if (getVoiceInteractor() != null) {
+            getVoiceInteractor().submitRequest(new CompleteVoiceRequest(prompt, null));
+        }
+    }
+
+    /**
+     * Indicates when the setting could not be changed.
+     */
+    protected void notifyFailure(String reason) {
+        getVoiceInteractor().submitRequest(new VoiceInteractor.AbortVoiceRequest(reason, null));
+    }
+}