1 files changed, 122 insertions, 0 deletions
diff --git a/core/java/android/service/dreams/Sandman.java b/core/java/android/service/dreams/Sandman.java
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+++ b/core/java/android/service/dreams/Sandman.java
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+/*
+ * Copyright (C) 2012 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 android.service.dreams;
+
+import android.content.ComponentName;
+import android.content.Context;
+import android.content.Intent;
+import android.os.PowerManager;
+import android.os.RemoteException;
+import android.os.ServiceManager;
+import android.os.SystemClock;
+import android.os.UserHandle;
+import android.provider.Settings;
+import android.util.Slog;
+
+/**
+ * Internal helper for launching dreams to ensure consistency between the
+ * <code>UiModeManagerService</code> system service and the <code>Somnambulator</code> activity.
+ *
+ * @hide
+ */
+public final class Sandman {
+    private static final String TAG = "Sandman";
+
+    private static final int DEFAULT_SCREENSAVER_ENABLED = 1;
+    private static final int DEFAULT_SCREENSAVER_ACTIVATED_ON_DOCK = 1;
+
+    // The component name of a special dock app that merely launches a dream.
+    // We don't want to launch this app when docked because it causes an unnecessary
+    // activity transition.  We just want to start the dream.
+    private static final ComponentName SOMNAMBULATOR_COMPONENT =
+            new ComponentName("com.android.systemui", "com.android.systemui.Somnambulator");
+
+
+    // The sandman is eternal.  No one instantiates him.
+    private Sandman() {
+    }
+
+    /**
+     * Returns true if the specified dock app intent should be started.
+     * False if we should dream instead, if appropriate.
+     */
+    public static boolean shouldStartDockApp(Context context, Intent intent) {
+        ComponentName name = intent.resolveActivity(context.getPackageManager());
+        return name != null && !name.equals(SOMNAMBULATOR_COMPONENT);
+    }
+
+    /**
+     * Starts a dream manually.
+     */
+    public static void startDreamByUserRequest(Context context) {
+        startDream(context, false);
+    }
+
+    /**
+     * Starts a dream when docked if the system has been configured to do so,
+     * otherwise does nothing.
+     */
+    public static void startDreamWhenDockedIfAppropriate(Context context) {
+        if (!isScreenSaverEnabled(context)
+                || !isScreenSaverActivatedOnDock(context)) {
+            Slog.i(TAG, "Dreams currently disabled for docks.");
+            return;
+        }
+
+        startDream(context, true);
+    }
+
+    private static void startDream(Context context, boolean docked) {
+        try {
+            IDreamManager dreamManagerService = IDreamManager.Stub.asInterface(
+                    ServiceManager.getService(DreamService.DREAM_SERVICE));
+            if (dreamManagerService != null && !dreamManagerService.isDreaming()) {
+                if (docked) {
+                    Slog.i(TAG, "Activating dream while docked.");
+
+                    // Wake up.
+                    // The power manager will wake up the system automatically when it starts
+                    // receiving power from a dock but there is a race between that happening
+                    // and the UI mode manager starting a dream.  We want the system to already
+                    // be awake by the time this happens.  Otherwise the dream may not start.
+                    PowerManager powerManager =
+                            (PowerManager)context.getSystemService(Context.POWER_SERVICE);
+                    powerManager.wakeUp(SystemClock.uptimeMillis());
+                } else {
+                    Slog.i(TAG, "Activating dream by user request.");
+                }
+
+                // Dream.
+                dreamManagerService.dream();
+            }
+        } catch (RemoteException ex) {
+            Slog.e(TAG, "Could not start dream when docked.", ex);
+        }
+    }
+
+    private static boolean isScreenSaverEnabled(Context context) {
+        return Settings.Secure.getIntForUser(context.getContentResolver(),
+                Settings.Secure.SCREENSAVER_ENABLED, DEFAULT_SCREENSAVER_ENABLED,
+                UserHandle.USER_CURRENT) != 0;
+    }
+
+    private static boolean isScreenSaverActivatedOnDock(Context context) {
+        return Settings.Secure.getIntForUser(context.getContentResolver(),
+                Settings.Secure.SCREENSAVER_ACTIVATE_ON_DOCK,
+                DEFAULT_SCREENSAVER_ACTIVATED_ON_DOCK, UserHandle.USER_CURRENT) != 0;
+    }
+}