Fix behavior of CMAS audio alert and vibration.

Fix bugs in CMAS audio alert and vibration behavior:
 * Use audio duration of 10.5 seconds for all CMAS alerts.
 * Fix vibration cadence to match CMAS tone cadence.
 * Mute audio when volume or camera keys are pressed.
 * Don't play audio or vibration in silent mode.
 * Don't play audio in vibrate mode.
 * Use notification volume rather than alarm volume.
 * Catch IllegalStateExceptions when stopping audio/TTS (sometimes
   throws "Unable to retrieve AudioTrack pointer for stop()").
 * Add Vibrate setting to CMAS settings for disabling vibration.

Bug: 7045214
Change-Id: Id98ea4f42f326b9a253407b9bbe67ca6acc6a20c

1 files changed, 20 insertions, 0 deletions

diff --git a/src/com/android/cellbroadcastreceiver/CellBroadcastAlertFullScreen.java b/src/com/android/cellbroadcastreceiver/CellBroadcastAlertFullScreen.java
index a8337f30..5bc2ba54 100644
--- a/src/com/android/cellbroadcastreceiver/CellBroadcastAlertFullScreen.java
+++ b/src/com/android/cellbroadcastreceiver/CellBroadcastAlertFullScreen.java
@@ -26,6 +26,7 @@ import android.os.Handler;
 import android.os.Message;
 import android.provider.Telephony;
 import android.telephony.CellBroadcastMessage;
+import android.view.KeyEvent;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.Window;
@@ -200,6 +201,25 @@ public class CellBroadcastAlertFullScreen extends Activity {
         finish();
     }
 
+    @Override
+    public boolean dispatchKeyEvent(KeyEvent event) {
+        switch (event.getKeyCode()) {
+            // Volume keys and camera keys mute the alert sound/vibration.
+            case KeyEvent.KEYCODE_VOLUME_UP:
+            case KeyEvent.KEYCODE_VOLUME_DOWN:
+            case KeyEvent.KEYCODE_VOLUME_MUTE:
+            case KeyEvent.KEYCODE_CAMERA:
+            case KeyEvent.KEYCODE_FOCUS:
+                // Stop playing alert sound/vibration/speech (if started)
+                stopService(new Intent(this, CellBroadcastAlertAudio.class));
+                return true;
+
+            default:
+                break;
+        }
+        return super.dispatchKeyEvent(event);
+    }
+
     /**
      * Ignore the back button for emergency alerts (overridden by alert dialog so that the dialog
      * is dismissed).