From f6b74dea040e3be9693a977605e9eb46c7e4032a Mon Sep 17 00:00:00 2001
From: Bryce Lee <brycelee@google.com>
Date: Sun, 9 Oct 2016 12:54:42 -0700
Subject: [PATCH] Add a way to query for supported Bluetooth profiles.

Currently there is no way to get the profiles supported by the Bluetooth
adapter. Asking for a profile proxy of an unsupported profile does not
fail and can lead to code indefinitely waiting for the proxy response. This
new code will allow for checking the supported profiles before asking for
the proxies.

Bug: 26451648
Change-Id: I4b48e7151f5ca53851aa3b967c143fae140ecd34
(cherry picked from commit b1301fa2849bafd6daa422281dc5200863bc761e)
---
 core/java/android/bluetooth/BluetoothAdapter.java | 30 +++++++++++++++++++++++
 core/java/android/bluetooth/BluetoothProfile.java |  7 ++++++
 core/java/android/bluetooth/IBluetooth.aidl       |  1 +
 3 files changed, 38 insertions(+)

diff --git a/core/java/android/bluetooth/BluetoothAdapter.java b/core/java/android/bluetooth/BluetoothAdapter.java
index b57a4e07bf8c..59edadce9620 100644
--- a/core/java/android/bluetooth/BluetoothAdapter.java
+++ b/core/java/android/bluetooth/BluetoothAdapter.java
@@ -1513,6 +1513,36 @@ public final class BluetoothAdapter {
     }
 
     /**
+     * Gets the currently supported profiles by the adapter.
+     *
+     *<p> This can be used to check whether a profile is supported before attempting
+     * to connect to its respective proxy.
+     *
+     * @return a list of integers indicating the ids of supported profiles as defined in
+     * {@link BluetoothProfile}.
+     * @hide
+     */
+    public List<Integer> getSupportedProfiles() {
+        final ArrayList<Integer> supportedProfiles = new ArrayList<Integer>();
+
+        try {
+            synchronized (mManagerCallback) {
+                if (mService != null) {
+                    final long supportedProfilesBitMask = mService.getSupportedProfiles();
+
+                    for (int i = 0; i <= BluetoothProfile.MAX_PROFILE_ID; i++) {
+                        if ((supportedProfilesBitMask & (1 << i)) != 0) {
+                            supportedProfiles.add(i);
+                        }
+                    }
+                }
+            }
+        } catch (RemoteException e) {Log.e(TAG, "getSupportedProfiles:", e);}
+
+        return supportedProfiles;
+    }
+
+    /**
      * Get the current connection state of the local Bluetooth adapter.
      * This can be used to check whether the local Bluetooth adapter is connected
      * to any profile of any other remote Bluetooth Device.
diff --git a/core/java/android/bluetooth/BluetoothProfile.java b/core/java/android/bluetooth/BluetoothProfile.java
index eee66d193fe4..20d95ccc3835 100644
--- a/core/java/android/bluetooth/BluetoothProfile.java
+++ b/core/java/android/bluetooth/BluetoothProfile.java
@@ -137,6 +137,13 @@ public interface BluetoothProfile {
     public static final int PBAP_CLIENT = 17;
 
     /**
+     * Max profile ID. This value should be updated whenever a new profile is added to match
+     * the largest value assigned to a profile.
+     * @hide
+     */
+    public static final int MAX_PROFILE_ID = 17;
+
+    /**
      * Default priority for devices that we try to auto-connect to and
      * and allow incoming connections for the profile
      * @hide
diff --git a/core/java/android/bluetooth/IBluetooth.aidl b/core/java/android/bluetooth/IBluetooth.aidl
index 8c985364f6ab..96a1ae8b9455 100644
--- a/core/java/android/bluetooth/IBluetooth.aidl
+++ b/core/java/android/bluetooth/IBluetooth.aidl
@@ -63,6 +63,7 @@ interface IBluetooth
     boolean removeBond(in BluetoothDevice device);
     int getBondState(in BluetoothDevice device);
     boolean isBondingInitiatedLocally(in BluetoothDevice device);
+    long getSupportedProfiles();
     int getConnectionState(in BluetoothDevice device);
 
     String getRemoteName(in BluetoothDevice device);
-- 
2.11.0