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/*
* Copyright (C) 2010 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.SdkConstant;
import android.annotation.SdkConstant.SdkConstantType;
import android.content.Context;
import android.os.IBinder;
import android.os.RemoteException;
import android.os.ServiceManager;
import android.util.Log;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
/**
* Public API for controlling the Bluetooth HID (Input Device) Profile
*
* BluetoothInputDevice is a proxy object used to make calls to Bluetooth Service
* which handles the HID profile.
*
* Creating a BluetoothInputDevice object will initiate a binding with the
* Bluetooth service. Users of this object should call close() when they
* are finished, so that this proxy object can unbind from the service.
*
* Currently the Bluetooth service runs in the system server and this
* proxy object will be immediately bound to the service on construction.
*
* @hide
*/
public final class BluetoothInputDevice {
private static final String TAG = "BluetoothInputDevice";
private static final boolean DBG = false;
/** int extra for ACTION_INPUT_DEVICE_STATE_CHANGED */
public static final String EXTRA_INPUT_DEVICE_STATE =
"android.bluetooth.inputdevice.extra.INPUT_DEVICE_STATE";
/** int extra for ACTION_INPUT_DEVICE_STATE_CHANGED */
public static final String EXTRA_PREVIOUS_INPUT_DEVICE_STATE =
"android.bluetooth.inputdevice.extra.PREVIOUS_INPUT_DEVICE_STATE";
/** Indicates the state of an input device has changed.
* This intent will always contain EXTRA_INPUT_DEVICE_STATE,
* EXTRA_PREVIOUS_INPUT_DEVICE_STATE and BluetoothDevice.EXTRA_DEVICE
* extras.
*/
@SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
public static final String ACTION_INPUT_DEVICE_STATE_CHANGED =
"android.bluetooth.inputdevice.action.INPUT_DEVICE_STATE_CHANGED";
public static final int STATE_DISCONNECTED = 0;
public static final int STATE_CONNECTING = 1;
public static final int STATE_CONNECTED = 2;
public static final int STATE_DISCONNECTING = 3;
/**
* Auto connection, incoming and outgoing connection are allowed at this
* priority level.
*/
public static final int PRIORITY_AUTO_CONNECT = 1000;
/**
* Incoming and outgoing connection are allowed at this priority level
*/
public static final int PRIORITY_ON = 100;
/**
* Connections to the device are not allowed at this priority level.
*/
public static final int PRIORITY_OFF = 0;
/**
* Default priority level when the device is unpaired.
*/
public static final int PRIORITY_UNDEFINED = -1;
private final IBluetooth mService;
private final Context mContext;
/**
* Create a BluetoothInputDevice proxy object for interacting with the local
* Bluetooth Service which handle the HID profile.
* @param c Context
*/
public BluetoothInputDevice(Context c) {
mContext = c;
IBinder b = ServiceManager.getService(BluetoothAdapter.BLUETOOTH_SERVICE);
if (b != null) {
mService = IBluetooth.Stub.asInterface(b);
} else {
Log.w(TAG, "Bluetooth Service not available!");
// Instead of throwing an exception which prevents people from going
// into Wireless settings in the emulator. Let it crash later when it is actually used.
mService = null;
}
}
/** Initiate a connection to an Input device.
*
* This function returns false on error and true if the connection
* attempt is being made.
*
* Listen for INPUT_DEVICE_STATE_CHANGED_ACTION to find out when the
* connection is completed.
* @param device Remote BT device.
* @return false on immediate error, true otherwise
* @hide
*/
public boolean connectInputDevice(BluetoothDevice device) {
if (DBG) log("connectInputDevice(" + device + ")");
try {
return mService.connectInputDevice(device);
} catch (RemoteException e) {
Log.e(TAG, "", e);
return false;
}
}
/** Initiate disconnect from an Input Device.
* This function return false on error and true if the disconnection
* attempt is being made.
*
* Listen for INPUT_DEVICE_STATE_CHANGED_ACTION to find out when
* disconnect is completed.
*
* @param device Remote BT device.
* @return false on immediate error, true otherwise
* @hide
*/
public boolean disconnectInputDevice(BluetoothDevice device) {
if (DBG) log("disconnectInputDevice(" + device + ")");
try {
return mService.disconnectInputDevice(device);
} catch (RemoteException e) {
Log.e(TAG, "", e);
return false;
}
}
/** Check if a specified InputDevice is connected.
*
* @param device Remote BT device.
* @return True if connected , false otherwise and on error.
* @hide
*/
public boolean isInputDeviceConnected(BluetoothDevice device) {
if (DBG) log("isInputDeviceConnected(" + device + ")");
int state = getInputDeviceState(device);
if (state == STATE_CONNECTED) return true;
return false;
}
/** Check if any Input Device is connected.
*
* @return a unmodifiable set of connected Input Devices, or null on error.
* @hide
*/
public Set<BluetoothDevice> getConnectedInputDevices() {
if (DBG) log("getConnectedInputDevices()");
try {
return Collections.unmodifiableSet(
new HashSet<BluetoothDevice>(
Arrays.asList(mService.getConnectedInputDevices())));
} catch (RemoteException e) {
Log.e(TAG, "", e);
return null;
}
}
/** Get the state of an Input Device.
*
* @param device Remote BT device.
* @return The current state of the Input Device
* @hide
*/
public int getInputDeviceState(BluetoothDevice device) {
if (DBG) log("getInputDeviceState(" + device + ")");
try {
return mService.getInputDeviceState(device);
} catch (RemoteException e) {
Log.e(TAG, "", e);
return STATE_DISCONNECTED;
}
}
/**
* Set priority of an input device.
*
* Priority is a non-negative integer. Priority can take the following
* values:
* {@link PRIORITY_ON}, {@link PRIORITY_OFF}, {@link PRIORITY_AUTO_CONNECT}
*
* @param device Paired device.
* @param priority Integer priority
* @return true if priority is set, false on error
*/
public boolean setInputDevicePriority(BluetoothDevice device, int priority) {
if (DBG) log("setInputDevicePriority(" + device + ", " + priority + ")");
try {
return mService.setInputDevicePriority(device, priority);
} catch (RemoteException e) {
Log.e(TAG, "", e);
return false;
}
}
/**
* Get the priority associated with an Input Device.
*
* @param device Input Device
* @return non-negative priority, or negative error code on error.
*/
public int getInputDevicePriority(BluetoothDevice device) {
if (DBG) log("getInputDevicePriority(" + device + ")");
try {
return mService.getInputDevicePriority(device);
} catch (RemoteException e) {
Log.e(TAG, "", e);
return PRIORITY_OFF;
}
}
private static void log(String msg) {
Log.d(TAG, msg);
}
}
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