src/com/android/settings/bluetooth/BluetoothDevicePreference.java

/*
 * 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 com.android.settings.bluetooth;

import android.app.AlertDialog;
import android.bluetooth.BluetoothClass;
import android.bluetooth.BluetoothDevice;
import android.content.Context;
import android.content.DialogInterface;
import android.content.res.Resources;
import android.os.UserManager;
import android.support.v7.preference.Preference;
import android.support.v7.preference.PreferenceViewHolder;
import android.text.Html;
import android.text.TextUtils;
import android.util.Log;
import android.util.Pair;
import android.util.TypedValue;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageView;

import com.android.settings.R;
import com.android.settings.search.Index;
import com.android.settings.search.SearchIndexableRaw;
import com.android.settingslib.bluetooth.CachedBluetoothDevice;
import com.android.settingslib.bluetooth.HidProfile;
import com.android.settingslib.bluetooth.LocalBluetoothProfile;

import java.util.List;

import static android.os.UserManager.DISALLOW_CONFIG_BLUETOOTH;

/**
 * BluetoothDevicePreference is the preference type used to display each remote
 * Bluetooth device in the Bluetooth Settings screen.
 */
public final class BluetoothDevicePreference extends Preference implements
        CachedBluetoothDevice.Callback, OnClickListener {
    private static final String TAG = "BluetoothDevicePreference";

    private static int sDimAlpha = Integer.MIN_VALUE;

    private final CachedBluetoothDevice mCachedDevice;

    private OnClickListener mOnSettingsClickListener;

    private AlertDialog mDisconnectDialog;

    private String contentDescription = null;

    /* Talk-back descriptions for various BT icons */
    Resources r = getContext().getResources();
    public final String COMPUTER =  r.getString(R.string.bluetooth_talkback_computer);
    public final String INPUT_PERIPHERAL = r.getString(
        R.string.bluetooth_talkback_input_peripheral);
    public final String HEADSET = r.getString(R.string.bluetooth_talkback_headset);
    public final String PHONE = r.getString(R.string.bluetooth_talkback_phone);
    public final String IMAGING = r.getString(R.string.bluetooth_talkback_imaging);
    public final String HEADPHONE = r.getString(R.string.bluetooth_talkback_headphone);
    public final String BLUETOOTH = r.getString(R.string.bluetooth_talkback_bluetooth);

    public BluetoothDevicePreference(Context context, CachedBluetoothDevice cachedDevice) {
        super(context);

        if (sDimAlpha == Integer.MIN_VALUE) {
            TypedValue outValue = new TypedValue();
            context.getTheme().resolveAttribute(android.R.attr.disabledAlpha, outValue, true);
            sDimAlpha = (int) (outValue.getFloat() * 255);
        }

        mCachedDevice = cachedDevice;

        setLayoutResource(R.layout.preference_bt_icon);

        if (cachedDevice.getBondState() == BluetoothDevice.BOND_BONDED) {
            UserManager um = (UserManager) context.getSystemService(Context.USER_SERVICE);
            if (! um.hasUserRestriction(DISALLOW_CONFIG_BLUETOOTH)) {
                setWidgetLayoutResource(R.layout.preference_bluetooth);
            }
        }

        mCachedDevice.registerCallback(this);

        onDeviceAttributesChanged();
    }

    void rebind() {
        notifyChanged();
    }

    CachedBluetoothDevice getCachedDevice() {
        return mCachedDevice;
    }

    public void setOnSettingsClickListener(OnClickListener listener) {
        mOnSettingsClickListener = listener;
    }

    @Override
    protected void onPrepareForRemoval() {
        super.onPrepareForRemoval();
        mCachedDevice.unregisterCallback(this);
        if (mDisconnectDialog != null) {
            mDisconnectDialog.dismiss();
            mDisconnectDialog = null;
        }
    }

    public void onDeviceAttributesChanged() {
        /*
         * The preference framework takes care of making sure the value has
         * changed before proceeding. It will also call notifyChanged() if
         * any preference info has changed from the previous value.
         */
        setTitle(mCachedDevice.getName());

        int summaryResId = mCachedDevice.getConnectionSummary();
        if (summaryResId != 0) {
            setSummary(summaryResId);
        } else {
            setSummary(null);   // empty summary for unpaired devices
        }


        Pair<Integer, String> pair = getBtClassDrawableWithDescription();
        if (pair.first != 0) {
            setIcon(pair.first);
            contentDescription = pair.second;
        }

        // Used to gray out the item
        setEnabled(!mCachedDevice.isBusy());

        // This could affect ordering, so notify that
        notifyHierarchyChanged();
    }

    @Override
    public void onBindViewHolder(PreferenceViewHolder view) {
        // Disable this view if the bluetooth enable/disable preference view is off
        if (null != findPreferenceInHierarchy("bt_checkbox")) {
            setDependency("bt_checkbox");
        }

        if (mCachedDevice.getBondState() == BluetoothDevice.BOND_BONDED) {
            ImageView deviceDetails = (ImageView) view.findViewById(R.id.deviceDetails);

            if (deviceDetails != null) {
                deviceDetails.setOnClickListener(this);
                deviceDetails.setTag(mCachedDevice);
            }
        }
        final ImageView imageView = (ImageView) view.findViewById(android.R.id.icon);
        if (imageView != null) {
            imageView.setContentDescription(contentDescription);
        }
        super.onBindViewHolder(view);
    }

    public void onClick(View v) {
        // Should never be null by construction
        if (mOnSettingsClickListener != null) {
            mOnSettingsClickListener.onClick(v);
        }
    }

    @Override
    public boolean equals(Object o) {
        if ((o == null) || !(o instanceof BluetoothDevicePreference)) {
            return false;
        }
        return mCachedDevice.equals(
                ((BluetoothDevicePreference) o).mCachedDevice);
    }

    @Override
    public int hashCode() {
        return mCachedDevice.hashCode();
    }

    @Override
    public int compareTo(Preference another) {
        if (!(another instanceof BluetoothDevicePreference)) {
            // Rely on default sort
            return super.compareTo(another);
        }

        return mCachedDevice
                .compareTo(((BluetoothDevicePreference) another).mCachedDevice);
    }

    void onClicked() {
        int bondState = mCachedDevice.getBondState();

        if (mCachedDevice.isConnected()) {
            askDisconnect();
        } else if (bondState == BluetoothDevice.BOND_BONDED) {
            mCachedDevice.connect(true);
        } else if (bondState == BluetoothDevice.BOND_NONE) {
            pair();
        }
    }

    // Show disconnect confirmation dialog for a device.
    private void askDisconnect() {
        Context context = getContext();
        String name = mCachedDevice.getName();
        if (TextUtils.isEmpty(name)) {
            name = context.getString(R.string.bluetooth_device);
        }
        String message = context.getString(R.string.bluetooth_disconnect_all_profiles, name);
        String title = context.getString(R.string.bluetooth_disconnect_title);

        DialogInterface.OnClickListener disconnectListener = new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                mCachedDevice.disconnect();
            }
        };

        mDisconnectDialog = Utils.showDisconnectDialog(context,
                mDisconnectDialog, disconnectListener, title, Html.fromHtml(message));
    }

    private void pair() {
        if (!mCachedDevice.startPairing()) {
            Utils.showError(getContext(), mCachedDevice.getName(),
                    R.string.bluetooth_pairing_error_message);
        } else {
            final Context context = getContext();

            SearchIndexableRaw data = new SearchIndexableRaw(context);
            data.className = BluetoothSettings.class.getName();
            data.title = mCachedDevice.getName();
            data.screenTitle = context.getResources().getString(R.string.bluetooth_settings);
            data.iconResId = R.drawable.ic_settings_bluetooth;
            data.enabled = true;

            Index.getInstance(context).updateFromSearchIndexableData(data);
        }
    }

    private Pair<Integer, String> getBtClassDrawableWithDescription() {
        BluetoothClass btClass = mCachedDevice.getBtClass();
        if (btClass != null) {
            switch (btClass.getMajorDeviceClass()) {
                case BluetoothClass.Device.Major.COMPUTER:
                    return new Pair<Integer, String>(R.drawable.ic_bt_laptop, COMPUTER);

                case BluetoothClass.Device.Major.PHONE:
                    return new Pair<Integer, String>(R.drawable.ic_bt_cellphone, PHONE);

                case BluetoothClass.Device.Major.PERIPHERAL:
                    return new Pair<Integer, String>(HidProfile.getHidClassDrawable(btClass),
                                                     INPUT_PERIPHERAL);

                case BluetoothClass.Device.Major.IMAGING:
                    return new Pair<Integer, String>(R.drawable.ic_bt_imaging, IMAGING);

                default:
                    // unrecognized device class; continue
            }
        } else {
            Log.w(TAG, "mBtClass is null");
        }

        List<LocalBluetoothProfile> profiles = mCachedDevice.getProfiles();
        for (LocalBluetoothProfile profile : profiles) {
            int resId = profile.getDrawableResource(btClass);
            if (resId != 0) {
                return new Pair<Integer, String>(resId, null);
            }
        }
        if (btClass != null) {
          if (btClass.doesClassMatch(BluetoothClass.PROFILE_HEADSET)) {
                return new Pair<Integer, String>(R.drawable.ic_bt_headset_hfp, HEADSET);
            }
          if (btClass.doesClassMatch(BluetoothClass.PROFILE_A2DP)) {
                return new Pair<Integer, String>(R.drawable.ic_bt_headphones_a2dp, HEADPHONE);
            }
        }
        return new Pair<Integer, String>(R.drawable.ic_settings_bluetooth, BLUETOOTH);
    }
}