| /* |
| * Copyright 2019 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package android.bluetooth; |
| |
| import android.annotation.NonNull; |
| import android.annotation.Nullable; |
| import android.annotation.SuppressLint; |
| import android.content.ComponentName; |
| import android.content.Context; |
| import android.content.Intent; |
| import android.content.pm.ApplicationInfo; |
| import android.content.pm.PackageManager; |
| import android.content.pm.ResolveInfo; |
| import android.os.Build; |
| import android.os.Handler; |
| import android.os.IBinder; |
| import android.os.Looper; |
| import android.os.Message; |
| import android.os.RemoteException; |
| import android.os.UserHandle; |
| import android.util.CloseGuard; |
| import android.util.Log; |
| |
| import java.util.List; |
| /** |
| * Connector for Bluetooth profile proxies to bind manager service and |
| * profile services |
| * @param <T> The Bluetooth profile interface for this connection. |
| * @hide |
| */ |
| @SuppressLint("AndroidFrameworkBluetoothPermission") |
| public abstract class BluetoothProfileConnector<T> { |
| private final CloseGuard mCloseGuard = new CloseGuard(); |
| private final int mProfileId; |
| private BluetoothProfile.ServiceListener mServiceListener; |
| private final BluetoothProfile mProfileProxy; |
| private Context mContext; |
| private final String mProfileName; |
| private final String mServiceName; |
| private volatile T mService; |
| |
| // -3 match with UserHandle.USER_CURRENT_OR_SELF |
| private static final UserHandle USER_HANDLE_CURRENT_OR_SELF = UserHandle.of(-3); |
| |
| private static final int MESSAGE_SERVICE_CONNECTED = 100; |
| private static final int MESSAGE_SERVICE_DISCONNECTED = 101; |
| |
| private final IBluetoothStateChangeCallback mBluetoothStateChangeCallback = |
| new IBluetoothStateChangeCallback.Stub() { |
| public void onBluetoothStateChange(boolean up) { |
| if (up) { |
| doBind(); |
| } else { |
| doUnbind(); |
| } |
| } |
| }; |
| |
| private @Nullable ComponentName resolveSystemService(@NonNull Intent intent, |
| @NonNull PackageManager pm) { |
| List<ResolveInfo> results = pm.queryIntentServices(intent, |
| PackageManager.ResolveInfoFlags.of(0)); |
| if (results == null) { |
| return null; |
| } |
| ComponentName comp = null; |
| for (int i = 0; i < results.size(); i++) { |
| ResolveInfo ri = results.get(i); |
| if ((ri.serviceInfo.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) == 0) { |
| continue; |
| } |
| ComponentName foundComp = new ComponentName(ri.serviceInfo.applicationInfo.packageName, |
| ri.serviceInfo.name); |
| if (comp != null) { |
| throw new IllegalStateException("Multiple system services handle " + intent |
| + ": " + comp + ", " + foundComp); |
| } |
| comp = foundComp; |
| } |
| return comp; |
| } |
| |
| private final IBluetoothProfileServiceConnection mConnection = |
| new IBluetoothProfileServiceConnection.Stub() { |
| @Override |
| public void onServiceConnected(ComponentName className, IBinder service) { |
| logDebug("Proxy object connected"); |
| mService = getServiceInterface(service); |
| mHandler.sendMessage(mHandler.obtainMessage( |
| MESSAGE_SERVICE_CONNECTED)); |
| } |
| |
| @Override |
| public void onServiceDisconnected(ComponentName className) { |
| logDebug("Proxy object disconnected"); |
| doUnbind(); |
| mHandler.sendMessage(mHandler.obtainMessage( |
| MESSAGE_SERVICE_DISCONNECTED)); |
| } |
| }; |
| |
| BluetoothProfileConnector(BluetoothProfile profile, int profileId, String profileName, |
| String serviceName) { |
| mProfileId = profileId; |
| mProfileProxy = profile; |
| mProfileName = profileName; |
| mServiceName = serviceName; |
| } |
| |
| /** {@hide} */ |
| @Override |
| public void finalize() { |
| mCloseGuard.warnIfOpen(); |
| doUnbind(); |
| } |
| |
| private boolean doBind() { |
| synchronized (mConnection) { |
| if (mService == null) { |
| logDebug("Binding service..."); |
| mCloseGuard.open("doUnbind"); |
| try { |
| return BluetoothAdapter.getDefaultAdapter().getBluetoothManager() |
| .bindBluetoothProfileService(mProfileId, mServiceName, mConnection); |
| } catch (RemoteException re) { |
| logError("Failed to bind service. " + re); |
| return false; |
| } |
| } |
| } |
| return true; |
| } |
| |
| private void doUnbind() { |
| synchronized (mConnection) { |
| if (mService != null) { |
| logDebug("Unbinding service..."); |
| mCloseGuard.close(); |
| try { |
| BluetoothAdapter.getDefaultAdapter().getBluetoothManager() |
| .unbindBluetoothProfileService(mProfileId, mConnection); |
| } catch (RemoteException re) { |
| logError("Unable to unbind service: " + re); |
| } finally { |
| mService = null; |
| } |
| } |
| } |
| } |
| |
| void connect(Context context, BluetoothProfile.ServiceListener listener) { |
| mContext = context; |
| mServiceListener = listener; |
| IBluetoothManager mgr = BluetoothAdapter.getDefaultAdapter().getBluetoothManager(); |
| |
| // Preserve legacy compatibility where apps were depending on |
| // registerStateChangeCallback() performing a permissions check which |
| // has been relaxed in modern platform versions |
| if (context.getApplicationInfo().targetSdkVersion <= Build.VERSION_CODES.R |
| && context.checkSelfPermission(android.Manifest.permission.BLUETOOTH) |
| != PackageManager.PERMISSION_GRANTED) { |
| throw new SecurityException("Need BLUETOOTH permission"); |
| } |
| |
| if (mgr != null) { |
| try { |
| mgr.registerStateChangeCallback(mBluetoothStateChangeCallback); |
| } catch (RemoteException re) { |
| logError("Failed to register state change callback. " + re); |
| } |
| } |
| doBind(); |
| } |
| |
| void disconnect() { |
| if (mServiceListener != null) { |
| BluetoothProfile.ServiceListener listener = mServiceListener; |
| mServiceListener = null; |
| listener.onServiceDisconnected(mProfileId); |
| } |
| IBluetoothManager mgr = BluetoothAdapter.getDefaultAdapter().getBluetoothManager(); |
| if (mgr != null) { |
| try { |
| mgr.unregisterStateChangeCallback(mBluetoothStateChangeCallback); |
| } catch (RemoteException re) { |
| logError("Failed to unregister state change callback" + re); |
| } |
| } |
| doUnbind(); |
| } |
| |
| T getService() { |
| return mService; |
| } |
| |
| /** |
| * This abstract function is used to implement method to get the |
| * connected Bluetooth service interface. |
| * @param service the connected binder service. |
| * @return T the binder interface of {@code service}. |
| * @hide |
| */ |
| public abstract T getServiceInterface(IBinder service); |
| |
| private void logDebug(String log) { |
| Log.d(mProfileName, log); |
| } |
| |
| private void logError(String log) { |
| Log.e(mProfileName, log); |
| } |
| |
| @SuppressLint("AndroidFrameworkBluetoothPermission") |
| private final Handler mHandler = new Handler(Looper.getMainLooper()) { |
| @Override |
| public void handleMessage(Message msg) { |
| switch (msg.what) { |
| case MESSAGE_SERVICE_CONNECTED: { |
| if (mServiceListener != null) { |
| mServiceListener.onServiceConnected(mProfileId, mProfileProxy); |
| } |
| break; |
| } |
| case MESSAGE_SERVICE_DISCONNECTED: { |
| if (mServiceListener != null) { |
| mServiceListener.onServiceDisconnected(mProfileId); |
| } |
| break; |
| } |
| } |
| } |
| }; |
| } |