bluetooth: android: Fix a couple of crashes when adapter is turned on/off.

device/bluetooth/android/java/src/org/chromium/device/bluetooth/Wrappers.java

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.device.bluetooth;
 
 import android.Manifest;
 import android.annotation.TargetApi;
 import android.bluetooth.BluetoothAdapter;
 import android.bluetooth.BluetoothDevice;
@@ skipping 28 matching lines @@
  *
  * Each Wrapper base class accepts an Android API object and passes through
  * calls to it. When under test, Fake subclasses override all methods that
  * pass through to the Android object and instead provide fake implementations.
  */
 @JNINamespace("device")
 @TargetApi(Build.VERSION_CODES.LOLLIPOP)
 class Wrappers {
     private static final String TAG = "Bluetooth";
 
+    public static final int DEVICE_CLASS_UNSPECIFIED = 0x1F00;
+
     /**
      * Wraps android.bluetooth.BluetoothAdapter.
      */
     static class BluetoothAdapterWrapper {
         private final BluetoothAdapter mAdapter;
         protected final ContextWrapper mContext;
-        protected final BluetoothLeScannerWrapper mScanner;
+        protected BluetoothLeScannerWrapper mScannerWrapper;
 
         /**
          * Creates a BluetoothAdapterWrapper using the default
          * android.bluetooth.BluetoothAdapter. May fail if the default adapter
          * is not available or if the application does not have sufficient
          * permissions.
          */
         @CalledByNative("BluetoothAdapterWrapper")
         public static BluetoothAdapterWrapper createWithDefaultAdapter(Context context) {
             final boolean hasMinAPI = Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP;
@@ skipping 21 matching lines @@
             if (!hasLowEnergyFeature) {
                 Log.i(TAG, "BluetoothAdapterWrapper.create failed: No Low Energy support.");
                 return null;
             }
 
             BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter();
             if (adapter == null) {
                 Log.i(TAG, "BluetoothAdapterWrapper.create failed: Default adapter not found.");
                 return null;
             } else {
-                return new BluetoothAdapterWrapper(adapter, new ContextWrapper(context),
-                        new BluetoothLeScannerWrapper(adapter.getBluetoothLeScanner()));
+                return new BluetoothAdapterWrapper(adapter, new ContextWrapper(context));
             }
         }
 
-        public BluetoothAdapterWrapper(BluetoothAdapter adapter, ContextWrapper context,
-                BluetoothLeScannerWrapper scanner) {
+        public BluetoothAdapterWrapper(BluetoothAdapter adapter, ContextWrapper context) {
             mAdapter = adapter;
             mContext = context;
-            mScanner = scanner;
+        }
+
+        public boolean disable() {
+            return mAdapter.disable();
+        }
+
+        public boolean enable() {
+            return mAdapter.enable();
+        }
+
+        public String getAddress() {
+            return mAdapter.getAddress();
+        }
+
+        public BluetoothLeScannerWrapper getBluetoothLeScanner() {
+            BluetoothLeScanner scanner = mAdapter.getBluetoothLeScanner();
+            if (scanner == null) {
+                return null;
+            }
+            if (mScannerWrapper == null) {
+                mScannerWrapper = new BluetoothLeScannerWrapper(scanner);
+            }
+            return mScannerWrapper;
         }
 
         public ContextWrapper getContext() {
             return mContext;
         }
 
-        public BluetoothLeScannerWrapper getBluetoothLeScanner() {
-            return mScanner;
-        }
-
-        public boolean isEnabled() {
-            return mAdapter.isEnabled();
-        }
-
-        public String getAddress() {
-            return mAdapter.getAddress();
-        }
-
         public String getName() {
             return mAdapter.getName();
         }
 
         public int getScanMode() {
             return mAdapter.getScanMode();
         }
 
         public boolean isDiscovering() {
             return mAdapter.isDiscovering();
         }
+
+        public boolean isEnabled() {
+            return mAdapter.isEnabled();
+        }
     }
 
     /**
      * Wraps android.content.Context.
      */
     static class ContextWrapper {
         private final Context mContext;
 
         public ContextWrapper(Context context) {
             mContext = context;
         }
 
         public boolean checkPermission(String permission) {
             return mContext.checkPermission(permission, Process.myPid(), Process.myUid())
                     == PackageManager.PERMISSION_GRANTED;
         }
     }
 
     /**
      * Wraps android.bluetooth.BluetoothLeScanner.
      */
     static class BluetoothLeScannerWrapper {
-        private final BluetoothLeScanner mScanner;
+        protected final BluetoothLeScanner mScanner;
         private final HashMap<ScanCallbackWrapper, ForwardScanCallbackToWrapper> mCallbacks;
 
         public BluetoothLeScannerWrapper(BluetoothLeScanner scanner) {
             mScanner = scanner;
             mCallbacks = new HashMap<ScanCallbackWrapper, ForwardScanCallbackToWrapper>();
         }
 
         public void startScan(
                 List<ScanFilter> filters, int scanSettingsScanMode, ScanCallbackWrapper callback) {
             ScanSettings settings =
@@ skipping 100 matching lines @@
                     mDevice.connectGatt(context, autoConnect,
                             new ForwardBluetoothGattCallbackToWrapper(callback, this)),
                     this);
         }
 
         public String getAddress() {
             return mDevice.getAddress();
         }
 
         public int getBluetoothClass_getDeviceClass() {
+            if (mDevice == null || mDevice.getBluetoothClass() == null) {
+                // BluetoothDevice.getBluetoothClass() returns null if adapter has been powered off.
+                // Return DEVICE_CLASS_UNSPECIFIED in these cases.
+                return DEVICE_CLASS_UNSPECIFIED;
+            }
             return mDevice.getBluetoothClass().getDeviceClass();
         }
 
         public int getBondState() {
             return mDevice.getBondState();
         }
 
         public String getName() {
             return mDevice.getName();
         }
@@ skipping 247 matching lines @@
 
         public byte[] getValue() {
             return mDescriptor.getValue();
         }
 
         public boolean setValue(byte[] value) {
             return mDescriptor.setValue(value);
         }
     }
 }