Check whether Bluetooth is enabled before making any API calls.

For example, Settings app makes calls to get Bonded Devices
before Bluetooth is on. This leads to ANRs and will
prevent autoconnection.

Change-Id: I56748a9bd1d603b5782c17775c6b20b831bf6572

1 files changed, 10 insertions, 0 deletions

diff --git a/core/java/android/bluetooth/BluetoothAdapter.java b/core/java/android/bluetooth/BluetoothAdapter.java
index 8eda844..bb4774d 100644
--- a/core/java/android/bluetooth/BluetoothAdapter.java
+++ b/core/java/android/bluetooth/BluetoothAdapter.java
@@ -474,6 +474,7 @@ public final class BluetoothAdapter {
      * @return     true if the name was set, false otherwise
      */
     public boolean setName(String name) {
+        if (getState() != STATE_ON) return false;
         try {
             return mService.setName(name);
         } catch (RemoteException e) {Log.e(TAG, "", e);}
@@ -493,6 +494,7 @@ public final class BluetoothAdapter {
      * @return scan mode
      */
     public int getScanMode() {
+        if (getState() != STATE_ON) return SCAN_MODE_NONE;
         try {
             return mService.getScanMode();
         } catch (RemoteException e) {Log.e(TAG, "", e);}
@@ -524,6 +526,7 @@ public final class BluetoothAdapter {
      * @hide
      */
     public boolean setScanMode(int mode, int duration) {
+        if (getState() != STATE_ON) return false;
         try {
             return mService.setScanMode(mode, duration);
         } catch (RemoteException e) {Log.e(TAG, "", e);}
@@ -532,11 +535,13 @@ public final class BluetoothAdapter {
 
     /** @hide */
     public boolean setScanMode(int mode) {
+        if (getState() != STATE_ON) return false;
         return setScanMode(mode, 120);
     }
 
     /** @hide */
     public int getDiscoverableTimeout() {
+        if (getState() != STATE_ON) return -1;
         try {
             return mService.getDiscoverableTimeout();
         } catch (RemoteException e) {Log.e(TAG, "", e);}
@@ -545,6 +550,7 @@ public final class BluetoothAdapter {
 
     /** @hide */
     public void setDiscoverableTimeout(int timeout) {
+        if (getState() != STATE_ON) return;
         try {
             mService.setDiscoverableTimeout(timeout);
         } catch (RemoteException e) {Log.e(TAG, "", e);}
@@ -577,6 +583,7 @@ public final class BluetoothAdapter {
      * @return true on success, false on error
      */
     public boolean startDiscovery() {
+        if (getState() != STATE_ON) return false;
         try {
             return mService.startDiscovery();
         } catch (RemoteException e) {Log.e(TAG, "", e);}
@@ -597,6 +604,7 @@ public final class BluetoothAdapter {
      * @return true on success, false on error
      */
     public boolean cancelDiscovery() {
+        if (getState() != STATE_ON) return false;
         try {
             mService.cancelDiscovery();
         } catch (RemoteException e) {Log.e(TAG, "", e);}
@@ -619,6 +627,7 @@ public final class BluetoothAdapter {
      * @return true if discovering
      */
     public boolean isDiscovering() {
+        if (getState() != STATE_ON) return false;
         try {
             return mService.isDiscovering();
         } catch (RemoteException e) {Log.e(TAG, "", e);}
@@ -633,6 +642,7 @@ public final class BluetoothAdapter {
      * @return unmodifiable set of {@link BluetoothDevice}, or null on error
      */
     public Set<BluetoothDevice> getBondedDevices() {
+        if (getState() != STATE_ON) return null;
         try {
             return toDeviceSet(mService.listBonds());
         } catch (RemoteException e) {Log.e(TAG, "", e);}