fdo#60486 Fix auto-enabling bluetooth and improve bluetooth handling.

We should only enable bluetooth with explicit approval of the user, see:
http://developer.android.com/reference/android/bluetooth/BluetoothAdapter.html#enable%28%29

We now also display an appropriate message if bluetooth is disabled.

Change-Id: Ic3a07c9ad0806a60ac7c7e609a30add7af18916f

android/sdremote/res/values/strings.xml

@@ -90,5 +90,6 @@
     <string name="requirements_network_connection">The Android device and a computer connected to the same network.</string>
     <string name="requirements_network_ports">If you have a firewall make sure ports 1598 and 1599 are opened.</string>
     <string name="requirements_bluetooth_connection">A computer with enabled Bluetooth.</string>
+    <string name="message_bluetooth_disabled">Please enable bluetooth to connect to a bluetooth enabled computer.</string>
 
 </resources>

android/sdremote/src/org/libreoffice/impressremote/activity/ComputersActivity.java

@@ -31,6 +31,8 @@ import org.libreoffice.impressremote.util.SavedStates;
 public class ComputersActivity extends SherlockFragmentActivity implements ActionBar.TabListener, ViewPager.OnPageChangeListener {
     private boolean mBluetoothWasEnabled;
 
+    private final static int REQUEST_ENABLE_BT = 1;
+
     @Override
     protected void onCreate(Bundle aSavedInstanceState) {
         super.onCreate(aSavedInstanceState);
@@ -42,6 +44,16 @@ public class ComputersActivity extends SherlockFragmentActivity implements Actio
         setUpContent();
     }
 
+    @Override
+    protected void onActivityResult(int arg0, int arg1, Intent arg2) {
+        super.onActivityResult(arg0, arg1, arg2);
+
+        if (arg0 == REQUEST_ENABLE_BT) {
+            // Ideally we should do all detection based on listening to the bluetooth state
+            // as the user can still enable BT separately (see BluetoothServersFinder.java:onReceive)
+        }
+    }
+
     private void saveBluetoothState(Bundle aSavedInstanceState) {
         // In more ideal world this work should be done at the service.
         // Unfortunately service cannot save or restore its state.
@@ -64,7 +76,7 @@ public class ComputersActivity extends SherlockFragmentActivity implements Actio
     }
 
     private void enableBluetooth() {
-        BluetoothOperator.enable();
+        BluetoothOperator.enable(this, REQUEST_ENABLE_BT);
     }
 
     private void setUpTitle() {

android/sdremote/src/org/libreoffice/impressremote/communication/BluetoothServersFinder.java

@@ -72,9 +72,19 @@ class BluetoothServersFinder extends BroadcastReceiver implements ServersFinder,
     public void onReceive(Context aContext, Intent aIntent) {
         if (BluetoothAdapter.ACTION_STATE_CHANGED.equals(aIntent.getAction())) {
             switch (aIntent.getIntExtra(BluetoothAdapter.EXTRA_STATE, 0)) {
-                case BluetoothAdapter.STATE_ON:
+                case BluetoothAdapter.STATE_ON: {
                     BluetoothOperator.getAdapter().startDiscovery();
+                    Intent aNewIntent = Intents.buildBluetoothStateChangedIntent();
+                    LocalBroadcastManager.getInstance(mContext).sendBroadcast(aNewIntent);
                     return;
+                }
+
+                case BluetoothAdapter.STATE_OFF: {
+                    mServers.clear();
+                    Intent aNewIntent = Intents.buildBluetoothStateChangedIntent();
+                    LocalBroadcastManager.getInstance(mContext).sendBroadcast(aNewIntent);
+                    return;
+                }
 
                 default:
                     return;

android/sdremote/src/org/libreoffice/impressremote/fragment/ComputersFragment.java

@@ -13,6 +13,7 @@ import java.util.List;
 import java.util.concurrent.TimeUnit;
 
 import android.app.Activity;
+import android.bluetooth.BluetoothAdapter;
 import android.content.BroadcastReceiver;
 import android.content.ComponentName;
 import android.content.Context;
@@ -55,6 +56,8 @@ public class ComputersFragment extends SherlockListFragment implements ServiceCo
         WIFI, BLUETOOTH
     }
 
+    boolean mBluetoothDisabled = false;
+
     private CommunicationService mCommunicationService;
     private BroadcastReceiver mIntentsReceiver;
 
@@ -148,7 +151,10 @@ public class ComputersFragment extends SherlockListFragment implements ServiceCo
                 return getString(R.string.message_search_wifi);
 
             case BLUETOOTH:
+                if (mBluetoothDisabled != true)
                     return getString(R.string.message_search_bluetooth);
+                else
+                    return getString(R.string.message_bluetooth_disabled);
 
             default:
                 return "";
@@ -210,6 +216,8 @@ public class ComputersFragment extends SherlockListFragment implements ServiceCo
             }
         }
 
+        mBluetoothDisabled = !BluetoothAdapter.getDefaultAdapter().isEnabled();
+
         return aComputers;
     }
 
@@ -251,18 +259,10 @@ public class ComputersFragment extends SherlockListFragment implements ServiceCo
             return;
         }
 
-        if (!isShowingProgressMessageRequired()) {
-            return;
-        }
-
         showProgressMessage();
         showLearnMoreMessage();
     }
 
-    private boolean isShowingProgressMessageRequired() {
-        return getProgressMessageView().getVisibility() == View.INVISIBLE;
-    }
-
     private void tearDownComputersAdapter() {
         setListAdapter(null);
     }
@@ -330,6 +330,8 @@ public class ComputersFragment extends SherlockListFragment implements ServiceCo
         public void onReceive(Context aContext, Intent aIntent) {
             if (Intents.Actions.SERVERS_LIST_CHANGED.equals(aIntent.getAction())) {
                 mComputersFragment.loadComputers();
+            } else if (Intents.Actions.BLUETOOTH_STATE_CHANGED.equals(aIntent.getAction())) {
+                mComputersFragment.loadComputers();
             }
         }
     }
@@ -337,7 +339,7 @@ public class ComputersFragment extends SherlockListFragment implements ServiceCo
     private IntentFilter buildIntentsReceiverFilter() {
         IntentFilter aIntentFilter = new IntentFilter();
         aIntentFilter.addAction(Intents.Actions.SERVERS_LIST_CHANGED);
-
+        aIntentFilter.addAction(Intents.Actions.BLUETOOTH_STATE_CHANGED);
         return aIntentFilter;
     }
 

android/sdremote/src/org/libreoffice/impressremote/util/BluetoothOperator.java

@@ -8,7 +8,9 @@
  */
 package org.libreoffice.impressremote.util;
 
+import android.app.Activity;
 import android.bluetooth.BluetoothAdapter;
+import android.content.Intent;
 
 public final class BluetoothOperator {
     private BluetoothOperator() {
@@ -26,12 +28,16 @@ public final class BluetoothOperator {
         return BluetoothAdapter.getDefaultAdapter();
     }
 
-    public static void enable() {
+    public static void enable(Activity aActivity, int nRequestCode) {
         if (!isAvailable()) {
             return;
         }
 
-        getAdapter().enable();
+        if (getAdapter() != null) {
+            Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
+            aActivity.startActivityForResult(enableBtIntent, nRequestCode);
+        }
+
     }
 
     public static void disable() {

android/sdremote/src/org/libreoffice/impressremote/util/Intents.java

@@ -29,6 +29,7 @@ public final class Intents {
         }
 
         public static final String SERVERS_LIST_CHANGED = "SERVERS_LIST_CHANGED";
+        public static final String BLUETOOTH_STATE_CHANGED = "BLUETOOTH_STATE_CHANGED";
 
         public static final String PAIRING_SUCCESSFUL = "PAIRING_SUCCESSFUL";
         public static final String PAIRING_VALIDATION = "PAIRING_VALIDATION";
@@ -74,6 +75,10 @@ public final class Intents {
         return new Intent(Actions.SERVERS_LIST_CHANGED);
     }
 
+    public static Intent buildBluetoothStateChangedIntent() {
+        return new Intent(Actions.BLUETOOTH_STATE_CHANGED);
+    }
+
     public static Intent buildPairingSuccessfulIntent() {
         return new Intent(Actions.PAIRING_SUCCESSFUL);
     }