Allow sysui-managed remote volume controllers.

- Relax restriction on audio service calls that assume the volume
  ui is systemui, allow calls from a blessed component app.
- Blessed component app service saved in secure settings.
- SystemUI mediates requests to replace the volume dialog, prompts
  the user on activation.
- Show a low pri ongoing notification when the volume dialog is
  being replaced, to allow user restoration at any time.
- Replace the controller management code in VolumeUI to use a
  ServiceMonitor, backed by the new blessed app component setting.
- Add proper zen-related noman client wrappers, make avail to the
  registered volume controller.
- Everything is still @hidden, no api impact.

Bug: 19260237
Change-Id: Ie1383f57659090318a7eda737fdad5b8f88737d4

1 files changed, 149 insertions, 32 deletions

diff --git a/packages/SystemUI/src/com/android/systemui/volume/VolumeUI.java b/packages/SystemUI/src/com/android/systemui/volume/VolumeUI.java
index 7102c2a..8048a48 100644
--- a/packages/SystemUI/src/com/android/systemui/volume/VolumeUI.java
+++ b/packages/SystemUI/src/com/android/systemui/volume/VolumeUI.java
@@ -1,60 +1,73 @@
+/*
+ * 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.systemui.volume;
 
+import android.app.Notification;
+import android.app.NotificationManager;
+import android.app.PendingIntent;
+import android.content.BroadcastReceiver;
+import android.content.ComponentName;
 import android.content.Context;
+import android.content.DialogInterface;
+import android.content.DialogInterface.OnClickListener;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.content.pm.ApplicationInfo;
 import android.content.res.Configuration;
-import android.database.ContentObserver;
 import android.media.AudioManager;
 import android.media.IRemoteVolumeController;
 import android.media.IVolumeController;
 import android.media.session.ISessionController;
 import android.media.session.MediaController;
 import android.media.session.MediaSessionManager;
-import android.net.Uri;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.RemoteException;
 import android.provider.Settings;
+import android.text.TextUtils;
 import android.util.Log;
 
 import com.android.systemui.R;
 import com.android.systemui.SystemUI;
 import com.android.systemui.keyguard.KeyguardViewMediator;
+import com.android.systemui.statusbar.ServiceMonitor;
 import com.android.systemui.statusbar.phone.PhoneStatusBar;
+import com.android.systemui.statusbar.phone.SystemUIDialog;
 import com.android.systemui.statusbar.policy.ZenModeController;
 import com.android.systemui.statusbar.policy.ZenModeControllerImpl;
 
 import java.io.FileDescriptor;
 import java.io.PrintWriter;
 
-/*
- * 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.
- */
-
 public class VolumeUI extends SystemUI {
     private static final String TAG = "VolumeUI";
-    private static final String SETTING = "systemui_volume_controller";  // for testing
-    private static final Uri SETTING_URI = Settings.Global.getUriFor(SETTING);
-    private static final int DEFAULT = 1;  // enabled by default
+    private static boolean LOGD = Log.isLoggable(TAG, Log.DEBUG);
 
     private final Handler mHandler = new Handler();
+    private final Receiver mReceiver = new Receiver();
+    private final RestorationNotification mRestorationNotification = new RestorationNotification();
 
     private boolean mEnabled;
     private AudioManager mAudioManager;
+    private NotificationManager mNotificationManager;
     private MediaSessionManager mMediaSessionManager;
     private VolumeController mVolumeController;
     private RemoteVolumeController mRemoteVolumeController;
+    private ServiceMonitor mVolumeControllerService;
 
     private VolumePanel mPanel;
     private int mDismissDelay;
@@ -64,14 +77,19 @@ public class VolumeUI extends SystemUI {
         mEnabled = mContext.getResources().getBoolean(R.bool.enable_volume_ui);
         if (!mEnabled) return;
         mAudioManager = (AudioManager) mContext.getSystemService(Context.AUDIO_SERVICE);
+        mNotificationManager =
+                (NotificationManager) mContext.getSystemService(Context.NOTIFICATION_SERVICE);
         mMediaSessionManager = (MediaSessionManager) mContext
                 .getSystemService(Context.MEDIA_SESSION_SERVICE);
         initPanel();
         mVolumeController = new VolumeController();
         mRemoteVolumeController = new RemoteVolumeController();
         putComponent(VolumeComponent.class, mVolumeController);
-        updateController();
-        mContext.getContentResolver().registerContentObserver(SETTING_URI, false, mObserver);
+        mReceiver.start();
+        mVolumeControllerService = new ServiceMonitor(TAG, LOGD,
+                mContext, Settings.Secure.VOLUME_CONTROLLER_SERVICE_COMPONENT,
+                new ServiceMonitorCallbacks());
+        mVolumeControllerService.start();
     }
 
     @Override
@@ -85,18 +103,19 @@ public class VolumeUI extends SystemUI {
     @Override
     public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
         pw.print("mEnabled="); pw.println(mEnabled);
+        pw.print("mVolumeControllerService="); pw.println(mVolumeControllerService.getComponent());
         if (mPanel != null) {
             mPanel.dump(fd, pw, args);
         }
     }
 
-    private void updateController() {
-        if (Settings.Global.getInt(mContext.getContentResolver(), SETTING, DEFAULT) != 0) {
-            Log.d(TAG, "Registering volume controller");
+    private void setVolumeController(boolean register) {
+        if (register) {
+            if (LOGD) Log.d(TAG, "Registering volume controller");
             mAudioManager.setVolumeController(mVolumeController);
             mMediaSessionManager.setRemoteVolumeController(mRemoteVolumeController);
         } else {
-            Log.d(TAG, "Unregistering volume controller");
+            if (LOGD) Log.d(TAG, "Unregistering volume controller");
             mAudioManager.setVolumeController(null);
             mMediaSessionManager.setRemoteVolumeController(null);
         }
@@ -129,13 +148,32 @@ public class VolumeUI extends SystemUI {
         });
     }
 
-    private final ContentObserver mObserver = new ContentObserver(mHandler) {
-        public void onChange(boolean selfChange, Uri uri) {
-            if (SETTING_URI.equals(uri)) {
-                updateController();
+    private String getAppLabel(ComponentName component) {
+        final String pkg = component.getPackageName();
+        try {
+            final ApplicationInfo ai = mContext.getPackageManager().getApplicationInfo(pkg, 0);
+            final String rt = mContext.getPackageManager().getApplicationLabel(ai).toString();
+            if (!TextUtils.isEmpty(rt)) {
+                return rt;
             }
+        } catch (Exception e) {
+            Log.w(TAG, "Error loading app label", e);
         }
-    };
+        return pkg;
+    }
+
+    private void showServiceActivationDialog(final ComponentName component) {
+        final SystemUIDialog d = new SystemUIDialog(mContext);
+        d.setMessage(mContext.getString(R.string.volumeui_prompt_message, getAppLabel(component)));
+        d.setPositiveButton(R.string.volumeui_prompt_allow, new OnClickListener() {
+            @Override
+            public void onClick(DialogInterface dialog, int which) {
+                mVolumeControllerService.setComponent(component);
+            }
+        });
+        d.setNegativeButton(R.string.volumeui_prompt_deny, null);
+        d.show();
+    }
 
     private final Runnable mStartZenSettings = new Runnable() {
         @Override
@@ -213,4 +251,83 @@ public class VolumeUI extends SystemUI {
             // than by remoteVolumeChanged.
         }
     }
+
+    private final class ServiceMonitorCallbacks implements ServiceMonitor.Callbacks {
+        @Override
+        public void onNoService() {
+            if (LOGD) Log.d(TAG, "onNoService");
+            setVolumeController(true);
+            mRestorationNotification.hide();
+        }
+
+        @Override
+        public long onServiceStartAttempt() {
+            if (LOGD) Log.d(TAG, "onServiceStartAttempt");
+            setVolumeController(false);
+            mVolumeController.dismissNow();
+            mRestorationNotification.show();
+            return 0;
+        }
+    }
+
+    private final class Receiver extends BroadcastReceiver {
+        private static final String ENABLE = "com.android.systemui.vui.ENABLE";
+        private static final String DISABLE = "com.android.systemui.vui.DISABLE";
+        private static final String EXTRA_COMPONENT = "component";
+
+        public void start() {
+            final IntentFilter filter = new IntentFilter();
+            filter.addAction(ENABLE);
+            filter.addAction(DISABLE);
+            mContext.registerReceiver(this, filter, null, mHandler);
+        }
+
+        @Override
+        public void onReceive(Context context, Intent intent) {
+            final String action = intent.getAction();
+            final ComponentName component = intent.getParcelableExtra(EXTRA_COMPONENT);
+            final boolean current = component.equals(mVolumeControllerService.getComponent());
+            if (ENABLE.equals(action) && component != null) {
+                if (!current) {
+                    showServiceActivationDialog(component);
+                }
+            }
+            if (DISABLE.equals(action) && component != null) {
+                if (current) {
+                    mVolumeControllerService.setComponent(null);
+                }
+            }
+        }
+    }
+
+    private final class RestorationNotification {
+        public void hide() {
+            mNotificationManager.cancel(R.id.notification_volumeui);
+        }
+
+        public void show() {
+            final ComponentName component = mVolumeControllerService.getComponent();
+            if (component == null) {
+                Log.w(TAG, "Not showing restoration notification, component not active");
+                return;
+            }
+            final Intent intent =  new Intent(Receiver.DISABLE)
+                    .putExtra(Receiver.EXTRA_COMPONENT, component);
+            mNotificationManager.notify(R.id.notification_volumeui,
+                    new Notification.Builder(mContext)
+                            .setSmallIcon(R.drawable.ic_ringer_audible)
+                            .setWhen(0)
+                            .setShowWhen(false)
+                            .setOngoing(true)
+                            .setContentTitle(mContext.getString(
+                                    R.string.volumeui_notification_title, getAppLabel(component)))
+                            .setContentText(mContext.getString(R.string.volumeui_notification_text))
+                            .setContentIntent(PendingIntent.getBroadcast(mContext, 0, intent, 0))
+                            .setPriority(Notification.PRIORITY_MIN)
+                            .setVisibility(Notification.VISIBILITY_PUBLIC)
+                            .setColor(mContext.getResources().getColor(
+                                    com.android.internal.R.color.system_notification_accent_color))
+                            .build());
+        }
+    }
 }