framework/java/android/bluetooth/BluetoothAvrcpController.java

/*
 * Copyright (C) 2014 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 static android.Manifest.permission.BLUETOOTH_CONNECT;
import static android.bluetooth.BluetoothProfile.STATE_DISCONNECTED;
import static android.bluetooth.BluetoothUtils.isValidDevice;

import android.annotation.RequiresNoPermission;
import android.annotation.RequiresPermission;
import android.annotation.SdkConstant;
import android.annotation.SdkConstant.SdkConstantType;
import android.bluetooth.annotations.RequiresBluetoothConnectPermission;
import android.bluetooth.annotations.RequiresLegacyBluetoothPermission;
import android.content.AttributionSource;
import android.content.Context;
import android.os.IBinder;
import android.os.RemoteException;
import android.util.Log;

import java.util.Collections;
import java.util.List;

/**
 * This class provides the public APIs to control the Bluetooth AVRCP Controller. It currently
 * supports player information, playback support and track metadata.
 *
 * <p>BluetoothAvrcpController is a proxy object for controlling the Bluetooth AVRCP Service via
 * IPC. Use {@link BluetoothAdapter#getProfileProxy} to get the BluetoothAvrcpController proxy
 * object.
 *
 * @hide
 */
public final class BluetoothAvrcpController implements BluetoothProfile {
    private static final String TAG = BluetoothAvrcpController.class.getSimpleName();

    private static final boolean DBG = Log.isLoggable("bluetooth", Log.DEBUG);
    private static final boolean VDBG = Log.isLoggable("bluetooth", Log.VERBOSE);

    /**
     * Intent used to broadcast the change in connection state of the AVRCP Controller profile.
     *
     * <p>This intent will have 3 extras:
     *
     * <ul>
     *   <li>{@link #EXTRA_STATE} - The current state of the profile.
     *   <li>{@link #EXTRA_PREVIOUS_STATE}- The previous state of the profile.
     *   <li>{@link BluetoothDevice#EXTRA_DEVICE} - The remote device.
     * </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}.
     */
    @RequiresLegacyBluetoothPermission
    @RequiresBluetoothConnectPermission
    @RequiresPermission(BLUETOOTH_CONNECT)
    @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
    public static final String ACTION_CONNECTION_STATE_CHANGED =
            "android.bluetooth.avrcp-controller.profile.action.CONNECTION_STATE_CHANGED";

    /**
     * Intent used to broadcast the change in player application setting state on AVRCP AG.
     *
     * <p>This intent will have the following extras:
     *
     * <ul>
     *   <li>{@link #EXTRA_PLAYER_SETTING} - {@link BluetoothAvrcpPlayerSettings} containing the
     *       most recent player setting.
     * </ul>
     */
    @RequiresBluetoothConnectPermission
    @RequiresPermission(BLUETOOTH_CONNECT)
    @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
    public static final String ACTION_PLAYER_SETTING =
            "android.bluetooth.avrcp-controller.profile.action.PLAYER_SETTING";

    public static final String EXTRA_PLAYER_SETTING =
            "android.bluetooth.avrcp-controller.profile.extra.PLAYER_SETTING";

    private final BluetoothAdapter mAdapter;
    private final AttributionSource mAttributionSource;

    private IBluetoothAvrcpController mService;

    /**
     * Create a BluetoothAvrcpController proxy object for interacting with the local Bluetooth AVRCP
     * service.
     */
    /* package */ BluetoothAvrcpController(Context context, BluetoothAdapter adapter) {
        mAdapter = adapter;
        mAttributionSource = adapter.getAttributionSource();
        mService = null;
    }

    /** @hide */
    @Override
    @RequiresNoPermission
    public void onServiceConnected(IBinder service) {
        mService = IBluetoothAvrcpController.Stub.asInterface(service);
    }

    /** @hide */
    @Override
    @RequiresNoPermission
    public void onServiceDisconnected() {
        mService = null;
    }

    private IBluetoothAvrcpController getService() {
        return mService;
    }

    /** @hide */
    @Override
    @RequiresNoPermission
    public BluetoothAdapter getAdapter() {
        return mAdapter;
    }

    @Override
    @SuppressWarnings("Finalize") // empty finalize for api signature
    public void finalize() {}

    /** {@inheritDoc} */
    @Override
    @RequiresBluetoothConnectPermission
    @RequiresPermission(BLUETOOTH_CONNECT)
    public List<BluetoothDevice> getConnectedDevices() {
        if (VDBG) log("getConnectedDevices()");
        final IBluetoothAvrcpController service = getService();
        if (service == null) {
            Log.w(TAG, "Proxy not attached to service");
            if (DBG) log(Log.getStackTraceString(new Throwable()));
        } else if (isEnabled()) {
            try {
                return Attributable.setAttributionSource(
                        service.getConnectedDevices(mAttributionSource), mAttributionSource);
            } catch (RemoteException e) {
                Log.e(TAG, e.toString() + "\n" + Log.getStackTraceString(new Throwable()));
            }
        }
        return Collections.emptyList();
    }

    /** {@inheritDoc} */
    @Override
    @RequiresBluetoothConnectPermission
    @RequiresPermission(BLUETOOTH_CONNECT)
    public List<BluetoothDevice> getDevicesMatchingConnectionStates(int[] states) {
        if (VDBG) log("getDevicesMatchingStates()");
        final IBluetoothAvrcpController service = getService();
        if (service == null) {
            Log.w(TAG, "Proxy not attached to service");
            if (DBG) log(Log.getStackTraceString(new Throwable()));
        } else if (isEnabled()) {
            try {
                return Attributable.setAttributionSource(
                        service.getDevicesMatchingConnectionStates(states, mAttributionSource),
                        mAttributionSource);
            } catch (RemoteException e) {
                Log.e(TAG, e.toString() + "\n" + Log.getStackTraceString(new Throwable()));
            }
        }
        return Collections.emptyList();
    }

    /** {@inheritDoc} */
    @Override
    @RequiresBluetoothConnectPermission
    @RequiresPermission(BLUETOOTH_CONNECT)
    public int getConnectionState(BluetoothDevice device) {
        if (VDBG) log("getState(" + device + ")");
        final IBluetoothAvrcpController service = getService();
        if (service == null) {
            Log.w(TAG, "Proxy not attached to service");
            if (DBG) log(Log.getStackTraceString(new Throwable()));
        } else if (isEnabled() && isValidDevice(device)) {
            try {
                return service.getConnectionState(device, mAttributionSource);
            } catch (RemoteException e) {
                Log.e(TAG, e.toString() + "\n" + Log.getStackTraceString(new Throwable()));
            }
        }
        return STATE_DISCONNECTED;
    }

    private boolean isEnabled() {
        return mAdapter.getState() == BluetoothAdapter.STATE_ON;
    }

    private static void log(String msg) {
        Log.d(TAG, msg);
    }
}