Add ability to turn BT on / off on a per application basis.

This changes adds an API for system applications
to enable bluetooth without all the side effects like
auto connection to headsets etc.

Also some tweaks to the adapter state machine

Change-Id: Ib9f22d548a26d72334b300101c8eb0d80f08a4bb

1 files changed, 63 insertions, 0 deletions

diff --git a/framework/java/android/bluetooth/BluetoothAdapter.java b/framework/java/android/bluetooth/BluetoothAdapter.java
index b993bd8e95..ca6f085dfb 100644
--- a/framework/java/android/bluetooth/BluetoothAdapter.java
+++ b/framework/java/android/bluetooth/BluetoothAdapter.java
@@ -1143,6 +1143,69 @@ public final class BluetoothAdapter {
         }
     }
 
+    /**
+     * Enable control of the Bluetooth Adapter for a single application.
+     *
+     * <p>Some applications need to use Bluetooth for short periods of time to
+     * transfer data but don't want all the associated implications like
+     * automatic connection to headsets etc.
+     *
+     * <p> Multiple applications can call this. This is reference counted and
+     * Bluetooth disabled only when no one else is using it. There will be no UI
+     * shown to the user while bluetooth is being enabled. Any user action will
+     * override this call. For example, if user wants Bluetooth on and the last
+     * user of this API wanted to disable Bluetooth, Bluetooth will not be
+     * turned off.
+     *
+     * <p> This API is only meant to be used by internal applications. Third
+     * party applications but use {@link #enable} and {@link #disable} APIs.
+     *
+     * <p> If this API returns true, it means the callback will be called.
+     * The callback will be called with the current state of Bluetooth.
+     * If the state is not what was requested, an internal error would be the
+     * reason.
+     *
+     * @param on True for on, false for off.
+     * @param callback The callback to notify changes to the state.
+     * @hide
+     */
+    public boolean changeApplicationBluetoothState(boolean on,
+                                                   BluetoothStateChangeCallback callback) {
+        if (callback == null) return false;
+
+        try {
+            return mService.changeApplicationBluetoothState(on, new
+                    StateChangeCallbackWrapper(callback), new Binder());
+        } catch (RemoteException e) {
+            Log.e(TAG, "changeBluetoothState", e);
+        }
+        return false;
+    }
+
+    /**
+     * @hide
+     */
+    public interface BluetoothStateChangeCallback {
+        public void onBluetoothStateChange(boolean on);
+    }
+
+    /**
+     * @hide
+     */
+    public class StateChangeCallbackWrapper extends IBluetoothStateChangeCallback.Stub {
+        private BluetoothStateChangeCallback mCallback;
+
+        StateChangeCallbackWrapper(BluetoothStateChangeCallback
+                callback) {
+            mCallback = callback;
+        }
+
+        @Override
+        public void onBluetoothStateChange(boolean on) {
+            mCallback.onBluetoothStateChange(on);
+        }
+    }
+
     private Set<BluetoothDevice> toDeviceSet(String[] addresses) {
         Set<BluetoothDevice> devices = new HashSet<BluetoothDevice>(addresses.length);
         for (int i = 0; i < addresses.length; i++) {