/*
* Copyright (C) 2008 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.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.IBinder;
import android.os.ParcelUuid;
import android.os.RemoteException;
import android.util.Log;
import java.util.ArrayList;
import java.util.List;
/**
* This class provides the public APIs to control the Bluetooth A2DP
* profile.
*
*<p>BluetoothA2dp is a proxy object for controlling the Bluetooth A2DP
* Service via IPC. Use {@link BluetoothAdapter#getProfileProxy} to get
* the BluetoothA2dp proxy object.
*
* <p> Android only supports one connected Bluetooth A2dp device at a time.
* Each method is protected with its appropriate permission.
*/
public final class BluetoothA2dp implements BluetoothProfile {
private static final String TAG = "BluetoothA2dp";
private static final boolean DBG = true;
private static final boolean VDBG = false;
/**
* Intent used to broadcast the change in connection state of the A2DP
* profile.
*
* <p>This intent will have 3 extras:
* <ul>
* <li> {@link #EXTRA_STATE} - The current state of the profile. </li>
* <li> {@link #EXTRA_PREVIOUS_STATE}- The previous state of the profile.</li>
* <li> {@link BluetoothDevice#EXTRA_DEVICE} - The remote device. </li>
* </ul>
*
* <p>{@link #EXTRA_STATE} or {@link #EXTRA_PREVIOUS_STATE} can be any of
* {@link #STATE_DISCONNECTED}, {@link #STATE_CONNECTING},
* {@link #STATE_CONNECTED}, {@link #STATE_DISCONNECTING}.
*
* <p>Requires {@link android.Manifest.permission#BLUETOOTH} permission to
* receive.
*/
@SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
public static final String ACTION_CONNECTION_STATE_CHANGED =
"android.bluetooth.a2dp.profile.action.CONNECTION_STATE_CHANGED";
/**
* Intent used to broadcast the change in the Playing state of the A2DP
* profile.
*
* <p>This intent will have 3 extras:
* <ul>
* <li> {@link #EXTRA_STATE} - The current state of the profile. </li>
* <li> {@link #EXTRA_PREVIOUS_STATE}- The previous state of the profile. </li>
* <li> {@link BluetoothDevice#EXTRA_DEVICE} - The remote device. </li>
* </ul>
*
* <p>{@link #EXTRA_STATE} or {@link #EXTRA_PREVIOUS_STATE} can be any of
* {@link #STATE_PLAYING}, {@link #STATE_NOT_PLAYING},
*
* <p>Requires {@link android.Manifest.permission#BLUETOOTH} permission to
* receive.
*/
@SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
public static final String ACTION_PLAYING_STATE_CHANGED =
"android.bluetooth.a2dp.profile.action.PLAYING_STATE_CHANGED";
/** @hide */
@SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
public static final String ACTION_AVRCP_CONNECTION_STATE_CHANGED =
"android.bluetooth.a2dp.profile.action.AVRCP_CONNECTION_STATE_CHANGED";
/**
* A2DP sink device is streaming music. This state can be one of
* {@link #EXTRA_STATE} or {@link #EXTRA_PREVIOUS_STATE} of
* {@link #ACTION_PLAYING_STATE_CHANGED} intent.
*/
public static final int STATE_PLAYING = 10;
/**
* A2DP sink device is NOT streaming music. This state can be one of
* {@link #EXTRA_STATE} or {@link #EXTRA_PREVIOUS_STATE} of
* {@link #ACTION_PLAYING_STATE_CHANGED} intent.
*/
public static final int STATE_NOT_PLAYING = 11;
private Context mContext;
private ServiceListener mServiceListener;
private IBluetoothA2dp mService;
private BluetoothAdapter mAdapter;
final private IBluetoothStateChangeCallback mBluetoothStateChangeCallback =
new IBluetoothStateChangeCallback.Stub() {
public void onBluetoothStateChange(boolean up) {
if (DBG) Log.d(TAG, "onBluetoothStateChange: up=" + up);
if (!up) {
if (VDBG) Log.d(TAG,"Unbinding service...");
synchronized (mConnection) {
try {
mService = null;
mContext.unbindService(mConnection);
} catch (Exception re) {
Log.e(TAG,"",re);
}
}
} else {
synchronized (mConnection) {
try {
if (mService == null) {
if (VDBG) Log.d(TAG,"Binding service...");
doBind();
}
} catch (Exception re) {
Log.e(TAG,"",re);
}
}
}
}
};
/**
* Create a BluetoothA2dp proxy object for interacting with the local
* Bluetooth A2DP service.
*
*/
/*package*/ BluetoothA2dp(Context context, ServiceListener l) {
mContext = context;
mServiceListener = l;
mAdapter = BluetoothAdapter.getDefaultAdapter();
IBluetoothManager mgr = mAdapter.getBluetoothManager();
if (mgr != null) {
try {
mgr.registerStateChangeCallback(mBluetoothStateChangeCallback);
} catch (RemoteException e) {
Log.e(TAG,"",e);
}
}
doBind();
}
boolean doBind() {
Intent intent = new Intent(IBluetoothA2dp.class.getName());
ComponentName comp = intent.resolveSystemService(mContext.getPackageManager(), 0);
intent.setComponent(comp);
if (comp == null || !mContext.bindServiceAsUser(intent, mConnection, 0,
android.os.Process.myUserHandle())) {
Log.e(TAG, "Could not bind to Bluetooth A2DP Service with " + intent);
return false;
}
return true;
}
/*package*/ void close() {
mServiceListener = null;
IBluetoothManager mgr = mAdapter.getBluetoothManager();
if (mgr != null) {
try {
mgr.unregisterStateChangeCallback(mBluetoothStateChangeCallback);
} catch (Exception e) {
Log.e(TAG,"",e);
}
}
synchronized (mConnection) {
if (mService != null) {
try {
mService = null;
mContext.unbindService(mConnection);
} catch (Exception re) {
Log.e(TAG,"",re);
}
}
}
}
public void finalize() {
close();
}
/**
* Initiate connection to a profile of the remote bluetooth device.
*
* <p> Currently, the system supports only 1 connection to the
* A2DP profile. The API will automatically disconnect connected
* devices before connecting.
*
* <p> This API returns false in scenarios like the profile on the
* device is already connected or Bluetooth is not turned on.
* When this API returns true, it is guaranteed that
* connection state intent for the profile will be broadcasted with
* the state. Users can get the connection state of the profile
* from this intent.
*
* <p>Requires {@link android.Manifest.permission#BLUETOOTH_ADMIN}
* permission.
*
* @param device Remote Bluetooth Device
* @return false on immediate error,
* true otherwise
* @hide
*/
public boolean connect(BluetoothDevice device) {
if (DBG) log("connect(" + device + ")");
if (mService != null && isEnabled() &&
isValidDevice(device)) {
try {
return mService.connect(device);
} catch (RemoteException e) {
Log.e(TAG, "Stack:" + Log.getStackTraceString(new Throwable()));
return false;
}
}
if (mService == null) Log.w(TAG, "Proxy not attached to service");
return false;
}
/**
* Initiate disconnection from a profile
*
* <p> This API will return false in scenarios like the profile on the
* Bluetooth device is not in connected state etc. When this API returns,
* true, it is guaranteed that the connection state change
* intent will be broadcasted with the state. Users can get the
* disconnection state of the profile from this intent.
*
* <p> If the disconnection is initiated by a remote device, the state
* will transition from {@link #STATE_CONNECTED} to
* {@link #STATE_DISCONNECTED}. If the disconnect is initiated by the
* host (local) device the state will transition from
* {@link #STATE_CONNECTED} to state {@link #STATE_DISCONNECTING} to
* state {@link #STATE_DISCONNECTED}. The transition to
* {@link #STATE_DISCONNECTING} can be used to distinguish between the
* two scenarios.
*
* <p>Requires {@link android.Manifest.permission#BLUETOOTH_ADMIN}
* permission.
*
* @param device Remote Bluetooth Device
* @return false on immediate error,
* true otherwise
* @hide
*/
public boolean disconnect(BluetoothDevice device) {
if (DBG) log("disconnect(" + device + ")");
if (mService != null && isEnabled() &&
isValidDevice(device)) {
try {
return mService.disconnect(device);
} catch (RemoteException e) {
Log.e(TAG, "Stack:" + Log.getStackTraceString(new Throwable()));
return false;
}
}
if (mService == null) Log.w(TAG, "Proxy not attached to service");
return false;
}
/**
* {@inheritDoc}
*/
public List<BluetoothDevice> getConnectedDevices() {
if (VDBG) log("getConnectedDevices()");
if (mService != null && isEnabled()) {
try {
return mService.getConnectedDevices();
} catch (RemoteException e) {
Log.e(TAG, "Stack:" + Log.getStackTraceString(new Throwable()));
return new ArrayList<BluetoothDevice>();
}
}
if (mService == null) Log.w(TAG, "Proxy not attached to service");
return new ArrayList<BluetoothDevice>();
}
/**
* {@inheritDoc}
*/
public List<BluetoothDevice> getDevicesMatchingConnectionStates(int[] states) {
if (VDBG) log("getDevicesMatchingStates()");
if (mService != null && isEnabled()) {
try {
return mService.getDevicesMatchingConnectionStates(states);
} catch (RemoteException e) {
Log.e(TAG, "Stack:" + Log.getStackTraceString(new Throwable()));
return new ArrayList<BluetoothDevice>();
}
}
if (mService == null) Log.w(TAG, "Proxy not attached to service");
return new ArrayList<BluetoothDevice>();
}
/**
* {@inheritDoc}
*/
public int getConnectionState(BluetoothDevice device) {
if (VDBG) log("getState(" + device + ")");
if (mService != null && isEnabled()
&& isValidDevice(device)) {
try {
return mService.getConnectionState(device);
} catch (RemoteException e) {
Log.e(TAG, "Stack:" + Log.getStackTraceString(new Throwable()));
return BluetoothProfile.STATE_DISCONNECTED;
}
}
if (mService == null) Log.w(TAG, "Proxy not attached to service");
return BluetoothProfile.STATE_DISCONNECTED;
}
/**
* Set priority of the profile
*
* <p> The device should already be paired.
* Priority can be one of {@link #PRIORITY_ON} orgetBluetoothManager
* {@link #PRIORITY_OFF},
*
* <p>Requires {@link android.Manifest.permission#BLUETOOTH_ADMIN}
* permission.
*
* @param device Paired bluetooth device
* @param priority
* @return true if priority is set, false on error
* @hide
*/
public boolean setPriority(BluetoothDevice device, int priority) {
if (DBG) log("setPriority(" + device + ", " + priority + ")");
if (mService != null && isEnabled()
&& isValidDevice(device)) {
if (priority != BluetoothProfile.PRIORITY_OFF &&
priority != BluetoothProfile.PRIORITY_ON){
return false;
}
try {
return mService.setPriority(device, priority);
} catch (RemoteException e) {
Log.e(TAG, "Stack:" + Log.getStackTraceString(new Throwable()));
return false;
}
}
if (mService == null) Log.w(TAG, "Proxy not attached to service");
return false;
}
/**
* Get the priority of the profile.
*
* <p> The priority can be any of:
* {@link #PRIORITY_AUTO_CONNECT}, {@link #PRIORITY_OFF},
* {@link #PRIORITY_ON}, {@link #PRIORITY_UNDEFINED}
*
* <p>Requires {@link android.Manifest.permission#BLUETOOTH} permission.
*
* @param device Bluetooth device
* @return priority of the device
* @hide
*/
public int getPriority(BluetoothDevice device) {
if (VDBG) log("getPriority(" + device + ")");
if (mService != null && isEnabled()
&& isValidDevice(device)) {
try {
return mService.getPriority(device);
} catch (RemoteException e) {
Log.e(TAG, "Stack:" + Log.getStackTraceString(new Throwable()));
return BluetoothProfile.PRIORITY_OFF;
}
}
if (mService == null) Log.w(TAG, "Proxy not attached to service");
return BluetoothProfile.PRIORITY_OFF;
}
/**
* Checks if Avrcp device supports the absolute volume feature.
*
* @return true if device supports absolute volume
* @hide
*/
public boolean isAvrcpAbsoluteVolumeSupported() {
if (DBG) Log.d(TAG, "isAvrcpAbsoluteVolumeSupported");
if (mService != null && isEnabled()) {
try {
return mService.isAvrcpAbsoluteVolumeSupported();
} catch (RemoteException e) {
Log.e(TAG, "Error talking to BT service in isAvrcpAbsoluteVolumeSupported()", e);
return false;
}
}
if (mService == null) Log.w(TAG, "Proxy not attached to service");
return false;
}
/**
* Tells remote device to adjust volume. Only if absolute volume is supported.
*
* @param direction 1 to increase volume, or -1 to decrease volume
* @hide
*/
public void adjustAvrcpAbsoluteVolume(int direction) {
if (DBG) Log.d(TAG, "adjustAvrcpAbsoluteVolume");
if (mService != null && isEnabled()) {
try {
mService.adjustAvrcpAbsoluteVolume(direction);
return;
} catch (RemoteException e) {
Log.e(TAG, "Error talking to BT service in adjustAvrcpAbsoluteVolume()", e);
return;
}
}
if (mService == null) Log.w(TAG, "Proxy not attached to service");
}
/**
* Tells remote device to set an absolute volume. Only if absolute volume is supported
*
* @param volume Absolute volume to be set on AVRCP side
* @hide
*/
public void setAvrcpAbsoluteVolume(int volume) {
if (DBG) Log.d(TAG, "setAvrcpAbsoluteVolume");
if (mService != null && isEnabled()) {
try {
mService.setAvrcpAbsoluteVolume(volume);
return;
} catch (RemoteException e) {
Log.e(TAG, "Error talking to BT service in setAvrcpAbsoluteVolume()", e);
return;
}
}
if (mService == null) Log.w(TAG, "Proxy not attached to service");
}
/**
* Check if A2DP profile is streaming music.
*
* <p>Requires {@link android.Manifest.permission#BLUETOOTH} permission.
*
* @param device BluetoothDevice device
*/
public boolean isA2dpPlaying(BluetoothDevice device) {
if (mService != null && isEnabled()
&& isValidDevice(device)) {
try {
return mService.isA2dpPlaying(device);
} catch (RemoteException e) {
Log.e(TAG, "Stack:" + Log.getStackTraceString(new Throwable()));
return false;
}
}
if (mService == null) Log.w(TAG, "Proxy not attached to service");
return false;
}
/**
* This function checks if the remote device is an AVCRP
* target and thus whether we should send volume keys
* changes or not.
* @hide
*/
public boolean shouldSendVolumeKeys(BluetoothDevice device) {
if (isEnabled() && isValidDevice(device)) {
ParcelUuid[] uuids = device.getUuids();
if (uuids == null) return false;
for (ParcelUuid uuid: uuids) {
if (BluetoothUuid.isAvrcpTarget(uuid)) {
return true;
}
}
}
return false;
}
/**
* Helper for converting a state to a string.
*
* For debug use only - strings are not internationalized.
* @hide
*/
public static String stateToString(int state) {
switch (state) {
case STATE_DISCONNECTED:
return "disconnected";
case STATE_CONNECTING:
return "connecting";
case STATE_CONNECTED:
return "connected";
case STATE_DISCONNECTING:
return "disconnecting";
case STATE_PLAYING:
return "playing";
case STATE_NOT_PLAYING:
return "not playing";
default:
return "<unknown state " + state + ">";
}
}
private final ServiceConnection mConnection = new ServiceConnection() {
public void onServiceConnected(ComponentName className, IBinder service) {
if (DBG) Log.d(TAG, "Proxy object connected");
mService = IBluetoothA2dp.Stub.asInterface(service);
if (mServiceListener != null) {
mServiceListener.onServiceConnected(BluetoothProfile.A2DP, BluetoothA2dp.this);
}
}
public void onServiceDisconnected(ComponentName className) {
if (DBG) Log.d(TAG, "Proxy object disconnected");
mService = null;
if (mServiceListener != null) {
mServiceListener.onServiceDisconnected(BluetoothProfile.A2DP);
}
}
};
private boolean isEnabled() {
if (mAdapter.getState() == BluetoothAdapter.STATE_ON) return true;
return false;
}
private boolean isValidDevice(BluetoothDevice device) {
if (device == null) return false;
if (BluetoothAdapter.checkBluetoothAddress(device.getAddress())) return true;
return false;
}
private static void log(String msg) {
Log.d(TAG, msg);
}
}
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