Update passphrase caching notification strategy.

On platforms (API >= 11) that support receiving click events within
a notification, we change the notification format so that users
can "lock" TextSecure with a click.

For all platforms, we change the notification icon in the status
bar from a "lock" to an "unlock," to better reflect the situation.

This is all part of the master plan for eliminating the passphrase
timeout option.

res/drawable/notify_panel_notification_icon_bg_tile.xml

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2011 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.
+-->
+
+<bitmap
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:tileMode="repeat"
+    android:src="@drawable/notify_panel_notification_icon_bg"
+    />

res/layout/key_caching_notification.xml

@@ -0,0 +1,44 @@
+<?xml version="1.0" encoding="utf-8"?>
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="fill_parent"
+    android:layout_height="fill_parent">
+
+    <LinearLayout android:layout_width="wrap_content"
+                  android:layout_height="wrap_content"
+                  android:layout_alignParentLeft="true"
+                  android:layout_centerVertical="true"
+                  android:orientation="vertical"
+                  android:layout_marginLeft="10dip">
+	<TextView android:id="@+id/title"
+        android:textAppearance="@style/NotificationTitle"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:singleLine="true"
+        android:ellipsize="marquee"
+        android:fadingEdge="horizontal"
+        android:text="@string/passphrase_cached"
+        />
+
+   <TextView android:id="@+id/text2"
+        android:textAppearance="@style/NotificationText"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="-2dp"
+        android:layout_marginBottom="-2dp"
+        android:singleLine="true"
+        android:fadingEdge="horizontal"
+        android:ellipsize="marquee"
+        android:text="@string/textsecure_passphrase_cached"
+        />
+    </LinearLayout>
+    
+	<ImageView android:id="@+id/lock_cache_icon"
+        android:src="@drawable/icon_lock"
+        android:layout_width="64dp"
+        android:layout_height="64dp"
+        android:background="@drawable/notify_panel_notification_icon_bg_tile"
+        android:scaleType="center" 
+        android:layout_alignParentRight="true"
+        />
+	    
+</RelativeLayout>

res/values-v9/styles.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <style name="NotificationText" parent="android:TextAppearance.StatusBar.EventContent" />
+    <style name="NotificationTitle" parent="android:TextAppearance.StatusBar.EventContent.Title" />
+</resources>

res/values/strings.xml

@@ -196,7 +196,7 @@
     
     <!-- KeyCachingService -->
     <string name="textsecure_passphrase_cached">TextSecure Passphrase Cached</string>
-    <string name="textsecure_cached">TextSecure Cached</string>
+    <string name="passphrase_cached">Passphrase Cached</string>
     
     <!-- MessageNotifier -->
     <string name="_d_new_messages">(%d) New messages</string>

res/values/styles.xml

@@ -11,4 +11,15 @@
 	    <item name="android:backgroundDimEnabled">false</item>
 	    <item name="android:background">@android:color/transparent</item>
 	</style>
+	
+	
+	<style name="NotificationText">
+      <item name="android:textColor">?android:attr/textColorPrimary</item>
+    </style>
+
+	<style name="NotificationTitle">
+      <item name="android:textColor">?android:attr/textColorPrimary</item>
+      <item name="android:textStyle">bold</item>
+    </style>
+	
 </resources>

src/org/thoughtcrime/securesms/service/KeyCachingService.java

@@ -23,10 +23,12 @@ import android.app.Service;
 import android.content.Intent;
 import android.content.SharedPreferences;
 import android.os.Binder;
+import android.os.Build;
 import android.os.IBinder;
 import android.os.SystemClock;
 import android.preference.PreferenceManager;
 import android.util.Log;
+import android.widget.RemoteViews;
 
 import org.thoughtcrime.securesms.ApplicationPreferencesActivity;
 import org.thoughtcrime.securesms.ConversationListActivity;
@@ -141,19 +143,39 @@ public class KeyCachingService extends Service {
     }
   }
 
-  private void foregroundService() {
+  private void foregroundServiceModern() {
+    Notification notification = new Notification(R.drawable.icon_cached, null, System.currentTimeMillis());
+    RemoteViews remoteViews   = new RemoteViews(getPackageName(), R.layout.key_caching_notification);
+
+    Intent intent = new Intent(this, KeyCachingService.class);
+    intent.setAction(PASSPHRASE_EXPIRED_EVENT);
+    PendingIntent pendingIntent = PendingIntent.getService(getApplicationContext(), 0, intent, 0);
+    remoteViews.setOnClickPendingIntent(R.id.lock_cache_icon, pendingIntent);
+
+    notification.contentView  = remoteViews;
+
+    stopForeground(true);
+    startForeground(SERVICE_RUNNING_ID, notification);
+  }
+
+  private void foregroundServiceLegacy() {
     Notification notification  = new Notification(R.drawable.icon_cached,
                                                   getString(R.string.textsecure_passphrase_cached),
                                                   System.currentTimeMillis());
     Intent intent              = new Intent(this, ConversationListActivity.class);
     PendingIntent launchIntent = PendingIntent.getActivity(getApplicationContext(), 0, intent, 0);
-    notification.setLatestEventInfo(getApplicationContext(), getString(R.string.textsecure_cached),
+    notification.setLatestEventInfo(getApplicationContext(), getString(R.string.passphrase_cached),
                                     getString(R.string.textsecure_passphrase_cached), launchIntent);
 
     stopForeground(true);
     startForeground(SERVICE_RUNNING_ID, notification);
   }
 
+  private void foregroundService() {
+    if (Build.VERSION.SDK_INT >= 11) foregroundServiceModern();
+    else                             foregroundServiceLegacy();
+  }
+
   private void broadcastNewSecret() {
     Log.w("service", "Broadcasting new secret...");
     Intent intent = new Intent(NEW_KEY_EVENT);