src/com/android/settings/bluetooth/BluetoothDevicePreference.java - LeafOS-Project/android_packages_apps_Settings - Gitiles

 /*
  * Copyright (C) 2023 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 static android.os.UserManager.DISALLOW_CONFIG_BLUETOOTH;

 import android.app.settings.SettingsEnums;
 import android.bluetooth.BluetoothAdapter;
 import android.bluetooth.BluetoothDevice;
 import android.content.Context;
 import android.content.DialogInterface;
 import android.content.res.Resources;
 import android.graphics.drawable.Drawable;
 import android.os.UserManager;
 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.widget.ImageView;

 import androidx.annotation.IntDef;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.annotation.VisibleForTesting;
 import androidx.appcompat.app.AlertDialog;
 import androidx.preference.Preference;
 import androidx.preference.PreferenceViewHolder;

 import com.android.settings.R;
 import com.android.settings.overlay.FeatureFactory;
 import com.android.settings.widget.GearPreference;
 import com.android.settingslib.bluetooth.CachedBluetoothDevice;
 import com.android.settingslib.core.instrumentation.MetricsFeatureProvider;
 import com.android.settingslib.utils.ThreadUtils;

 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 import java.util.HashSet;
 import java.util.Set;
 import java.util.concurrent.RejectedExecutionException;
 import java.util.concurrent.atomic.AtomicInteger;

 /**
  * BluetoothDevicePreference is the preference type used to display each remote
  * Bluetooth device in the Bluetooth Settings screen.
  */
 public final class BluetoothDevicePreference extends GearPreference {
     private static final String TAG = "BluetoothDevicePref";

     private static int sDimAlpha = Integer.MIN_VALUE;

     @Retention(RetentionPolicy.SOURCE)
     @IntDef({SortType.TYPE_DEFAULT,
             SortType.TYPE_FIFO,
             SortType.TYPE_NO_SORT})
     public @interface SortType {
         int TYPE_DEFAULT = 1;
         int TYPE_FIFO = 2;
         int TYPE_NO_SORT = 3;
     }

     private final CachedBluetoothDevice mCachedDevice;
     private final UserManager mUserManager;

     private Set<BluetoothDevice> mBluetoothDevices;
     @VisibleForTesting
     BluetoothAdapter mBluetoothAdapter;
     private final boolean mShowDevicesWithoutNames;
     @NonNull
     private static final AtomicInteger sNextId = new AtomicInteger();
     private final int mId;
     private final int mType;

     private AlertDialog mDisconnectDialog;
     private String contentDescription = null;
     private boolean mHideSecondTarget = false;
     private boolean mIsCallbackRemoved = true;
     @VisibleForTesting
     boolean mNeedNotifyHierarchyChanged = false;
     /* Talk-back descriptions for various BT icons */
     Resources mResources;
     final BluetoothDevicePreferenceCallback mCallback;
     @VisibleForTesting
     final BluetoothAdapter.OnMetadataChangedListener mMetadataListener =
             new BluetoothAdapter.OnMetadataChangedListener() {
                 @Override
                 public void onMetadataChanged(BluetoothDevice device, int key, byte[] value) {
                     Log.d(TAG, String.format("Metadata updated in Device %s: %d = %s.",
                             device.getAnonymizedAddress(),
                             key, value == null ? null : new String(value)));
                     onPreferenceAttributesChanged();
                 }
             };

     private class BluetoothDevicePreferenceCallback implements CachedBluetoothDevice.Callback {

         @Override
         public void onDeviceAttributesChanged() {
             onPreferenceAttributesChanged();
         }
     }

     public BluetoothDevicePreference(Context context, CachedBluetoothDevice cachedDevice,
             boolean showDeviceWithoutNames, @SortType int type) {
         super(context, null);
         mResources = getContext().getResources();
         mUserManager = (UserManager) context.getSystemService(Context.USER_SERVICE);
         mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
         mShowDevicesWithoutNames = showDeviceWithoutNames;

         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;
         mCallback = new BluetoothDevicePreferenceCallback();
         mId = sNextId.getAndIncrement();
         mType = type;
         setVisible(false);

         onPreferenceAttributesChanged();
     }

     public void setNeedNotifyHierarchyChanged(boolean needNotifyHierarchyChanged) {
         mNeedNotifyHierarchyChanged = needNotifyHierarchyChanged;
     }

     @Override
     protected boolean shouldHideSecondTarget() {
         return mCachedDevice == null
                 || mCachedDevice.getBondState() != BluetoothDevice.BOND_BONDED
                 || mUserManager.hasUserRestriction(DISALLOW_CONFIG_BLUETOOTH)
                 || mHideSecondTarget;
     }

     @Override
     protected int getSecondTargetResId() {
         return R.layout.preference_widget_gear;
     }

     CachedBluetoothDevice getCachedDevice() {
         return mCachedDevice;
     }

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

     @Override
     public void onAttached() {
         super.onAttached();
         if (mIsCallbackRemoved) {
             mCachedDevice.registerCallback(mCallback);
             registerMetadataChangedListener();
             mIsCallbackRemoved = false;
         }
         onPreferenceAttributesChanged();
     }

     @Override
     public void onDetached() {
         super.onDetached();
         if (!mIsCallbackRemoved) {
             mCachedDevice.unregisterCallback(mCallback);
             unregisterMetadataChangedListener();
             mIsCallbackRemoved = true;
         }
     }

     private void registerMetadataChangedListener() {
         if (mBluetoothAdapter == null) {
             Log.d(TAG, "No mBluetoothAdapter");
             return;
         }
         if (mBluetoothDevices == null) {
             mBluetoothDevices = new HashSet<>();
         }
         mBluetoothDevices.clear();
         if (mCachedDevice.getDevice() != null) {
             mBluetoothDevices.add(mCachedDevice.getDevice());
         }
         for (CachedBluetoothDevice cbd : mCachedDevice.getMemberDevice()) {
             mBluetoothDevices.add(cbd.getDevice());
         }
         if (mBluetoothDevices.isEmpty()) {
             Log.d(TAG, "No BT device to register.");
             return;
         }
         Set<BluetoothDevice> errorDevices = new HashSet<>();
         mBluetoothDevices.forEach(bd -> {
             try {
                 boolean isSuccess = mBluetoothAdapter.addOnMetadataChangedListener(bd,
                         getContext().getMainExecutor(), mMetadataListener);
                 if (!isSuccess) {
                     Log.e(TAG, bd.getAnonymizedAddress() + ": add into Listener failed");
                     errorDevices.add(bd);
                 }
             } catch (NullPointerException e) {
                 errorDevices.add(bd);
                 Log.e(TAG, bd.getAnonymizedAddress() + ":" + e.toString());
             } catch (IllegalArgumentException e) {
                 errorDevices.add(bd);
                 Log.e(TAG, bd.getAnonymizedAddress() + ":" + e.toString());
             }
         });
         for (BluetoothDevice errorDevice : errorDevices) {
             mBluetoothDevices.remove(errorDevice);
             Log.d(TAG, "mBluetoothDevices remove " + errorDevice.getAnonymizedAddress());
         }
     }

     private void unregisterMetadataChangedListener() {
         if (mBluetoothAdapter == null) {
             Log.d(TAG, "No mBluetoothAdapter");
             return;
         }
         if (mBluetoothDevices == null || mBluetoothDevices.isEmpty()) {
             Log.d(TAG, "No BT device to unregister.");
             return;
         }
         mBluetoothDevices.forEach(bd -> {
             try {
                 mBluetoothAdapter.removeOnMetadataChangedListener(bd, mMetadataListener);
             } catch (NullPointerException e) {
                 Log.e(TAG, bd.getAnonymizedAddress() + ":" + e.toString());
             } catch (IllegalArgumentException e) {
                 Log.e(TAG, bd.getAnonymizedAddress() + ":" + e.toString());
             }
         });
         mBluetoothDevices.clear();
     }

     public CachedBluetoothDevice getBluetoothDevice() {
         return mCachedDevice;
     }

     public void hideSecondTarget(boolean hideSecondTarget) {
         mHideSecondTarget = hideSecondTarget;
     }

     @SuppressWarnings("FutureReturnValueIgnored")
     void onPreferenceAttributesChanged() {
         try {
             ThreadUtils.postOnBackgroundThread(() -> {
                 @Nullable String name = mCachedDevice.getName();
                 // Null check is done at the framework
                 @Nullable String connectionSummary = getConnectionSummary();
                 @NonNull Pair<Drawable, String> pair = mCachedDevice.getDrawableWithDescription();
                 boolean isBusy = mCachedDevice.isBusy();
                 // Device is only visible in the UI if it has a valid name besides MAC address or
                 // when user allows showing devices without user-friendly name in developer settings
                 boolean isVisible =
                         mShowDevicesWithoutNames || mCachedDevice.hasHumanReadableName();

                 ThreadUtils.postOnMainThread(() -> {
                     /*
                      * 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(name);
                     setSummary(connectionSummary);
                     setIcon(pair.first);
                     contentDescription = pair.second;
                     // Used to gray out the item
                     setEnabled(!isBusy);
                     setVisible(isVisible);

                     // This could affect ordering, so notify that
                     if (mNeedNotifyHierarchyChanged) {
                         notifyHierarchyChanged();
                     }
                 });
             });
         } catch (RejectedExecutionException e) {
             Log.w(TAG, "Handler thread unavailable, skipping getConnectionSummary!");
         }
     }

     @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.settings_button);

             if (deviceDetails != null) {
                 deviceDetails.setOnClickListener(this);
             }
         }
         final ImageView imageView = (ImageView) view.findViewById(android.R.id.icon);
         if (imageView != null) {
             imageView.setContentDescription(contentDescription);
             // Set property to prevent Talkback from reading out.
             imageView.setImportantForAccessibility(View.IMPORTANT_FOR_ACCESSIBILITY_NO);
             imageView.setElevation(
                     getContext().getResources().getDimension(R.dimen.bt_icon_elevation));
         }
         super.onBindViewHolder(view);
     }

     @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);
         }

         switch (mType) {
             case SortType.TYPE_DEFAULT:
                 return mCachedDevice
                         .compareTo(((BluetoothDevicePreference) another).mCachedDevice);
             case SortType.TYPE_FIFO:
                 return mId > ((BluetoothDevicePreference) another).mId ? 1 : -1;
             default:
                 return super.compareTo(another);
         }
     }

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

         final MetricsFeatureProvider metricsFeatureProvider =
                 FeatureFactory.getFeatureFactory().getMetricsFeatureProvider();

         if (mCachedDevice.isConnected()) {
             metricsFeatureProvider.action(context,
                     SettingsEnums.ACTION_SETTINGS_BLUETOOTH_DISCONNECT);
             askDisconnect();
         } else if (bondState == BluetoothDevice.BOND_BONDED) {
             metricsFeatureProvider.action(context,
                     SettingsEnums.ACTION_SETTINGS_BLUETOOTH_CONNECT);
             mCachedDevice.connect();
         } else if (bondState == BluetoothDevice.BOND_NONE) {
             metricsFeatureProvider.action(context,
                     SettingsEnums.ACTION_SETTINGS_BLUETOOTH_PAIR);
             if (!mCachedDevice.hasHumanReadableName()) {
                 metricsFeatureProvider.action(context,
                         SettingsEnums.ACTION_SETTINGS_BLUETOOTH_PAIR_DEVICES_WITHOUT_NAMES);
             }
             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(),
                     com.android.settingslib.R.string.bluetooth_pairing_error_message);
         }
     }

     private String getConnectionSummary() {
         String summary = null;
         if (mCachedDevice.getBondState() != BluetoothDevice.BOND_NONE) {
             summary = mCachedDevice.getConnectionSummary();
         }
         return summary;
     }
 }
	/*
	* Copyright (C) 2023 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 static android.os.UserManager.DISALLOW_CONFIG_BLUETOOTH;

	import android.app.settings.SettingsEnums;
	import android.bluetooth.BluetoothAdapter;
	import android.bluetooth.BluetoothDevice;
	import android.content.Context;
	import android.content.DialogInterface;
	import android.content.res.Resources;
	import android.graphics.drawable.Drawable;
	import android.os.UserManager;
	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.widget.ImageView;

	import androidx.annotation.IntDef;
	import androidx.annotation.NonNull;
	import androidx.annotation.Nullable;
	import androidx.annotation.VisibleForTesting;
	import androidx.appcompat.app.AlertDialog;
	import androidx.preference.Preference;
	import androidx.preference.PreferenceViewHolder;

	import com.android.settings.R;
	import com.android.settings.overlay.FeatureFactory;
	import com.android.settings.widget.GearPreference;
	import com.android.settingslib.bluetooth.CachedBluetoothDevice;
	import com.android.settingslib.core.instrumentation.MetricsFeatureProvider;
	import com.android.settingslib.utils.ThreadUtils;

	import java.lang.annotation.Retention;
	import java.lang.annotation.RetentionPolicy;
	import java.util.HashSet;
	import java.util.Set;
	import java.util.concurrent.RejectedExecutionException;
	import java.util.concurrent.atomic.AtomicInteger;

	/**
	* BluetoothDevicePreference is the preference type used to display each remote
	* Bluetooth device in the Bluetooth Settings screen.
	*/
	public final class BluetoothDevicePreference extends GearPreference {
	private static final String TAG = "BluetoothDevicePref";

	private static int sDimAlpha = Integer.MIN_VALUE;

	@Retention(RetentionPolicy.SOURCE)
	@IntDef({SortType.TYPE_DEFAULT,
	SortType.TYPE_FIFO,
	SortType.TYPE_NO_SORT})
	public @interface SortType {
	int TYPE_DEFAULT = 1;
	int TYPE_FIFO = 2;
	int TYPE_NO_SORT = 3;
	}

	private final CachedBluetoothDevice mCachedDevice;
	private final UserManager mUserManager;

	private Set<BluetoothDevice> mBluetoothDevices;
	@VisibleForTesting
	BluetoothAdapter mBluetoothAdapter;
	private final boolean mShowDevicesWithoutNames;
	@NonNull
	private static final AtomicInteger sNextId = new AtomicInteger();
	private final int mId;
	private final int mType;

	private AlertDialog mDisconnectDialog;
	private String contentDescription = null;
	private boolean mHideSecondTarget = false;
	private boolean mIsCallbackRemoved = true;
	@VisibleForTesting
	boolean mNeedNotifyHierarchyChanged = false;
	/* Talk-back descriptions for various BT icons */
	Resources mResources;
	final BluetoothDevicePreferenceCallback mCallback;
	@VisibleForTesting
	final BluetoothAdapter.OnMetadataChangedListener mMetadataListener =
	new BluetoothAdapter.OnMetadataChangedListener() {
	@Override
	public void onMetadataChanged(BluetoothDevice device, int key, byte[] value) {
	Log.d(TAG, String.format("Metadata updated in Device %s: %d = %s.",
	device.getAnonymizedAddress(),
	key, value == null ? null : new String(value)));
	onPreferenceAttributesChanged();
	}
	};

	private class BluetoothDevicePreferenceCallback implements CachedBluetoothDevice.Callback {

	@Override
	public void onDeviceAttributesChanged() {
	onPreferenceAttributesChanged();
	}
	}

	public BluetoothDevicePreference(Context context, CachedBluetoothDevice cachedDevice,
	boolean showDeviceWithoutNames, @SortType int type) {
	super(context, null);
	mResources = getContext().getResources();
	mUserManager = (UserManager) context.getSystemService(Context.USER_SERVICE);
	mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
	mShowDevicesWithoutNames = showDeviceWithoutNames;

	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;
	mCallback = new BluetoothDevicePreferenceCallback();
	mId = sNextId.getAndIncrement();
	mType = type;
	setVisible(false);

	onPreferenceAttributesChanged();
	}

	public void setNeedNotifyHierarchyChanged(boolean needNotifyHierarchyChanged) {
	mNeedNotifyHierarchyChanged = needNotifyHierarchyChanged;
	}

	@Override
	protected boolean shouldHideSecondTarget() {
	return mCachedDevice == null
	\|\| mCachedDevice.getBondState() != BluetoothDevice.BOND_BONDED
	\|\| mUserManager.hasUserRestriction(DISALLOW_CONFIG_BLUETOOTH)
	\|\| mHideSecondTarget;
	}

	@Override
	protected int getSecondTargetResId() {
	return R.layout.preference_widget_gear;
	}

	CachedBluetoothDevice getCachedDevice() {
	return mCachedDevice;
	}

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

	@Override
	public void onAttached() {
	super.onAttached();
	if (mIsCallbackRemoved) {
	mCachedDevice.registerCallback(mCallback);
	registerMetadataChangedListener();
	mIsCallbackRemoved = false;
	}
	onPreferenceAttributesChanged();
	}

	@Override
	public void onDetached() {
	super.onDetached();
	if (!mIsCallbackRemoved) {
	mCachedDevice.unregisterCallback(mCallback);
	unregisterMetadataChangedListener();
	mIsCallbackRemoved = true;
	}
	}

	private void registerMetadataChangedListener() {
	if (mBluetoothAdapter == null) {
	Log.d(TAG, "No mBluetoothAdapter");
	return;
	}
	if (mBluetoothDevices == null) {
	mBluetoothDevices = new HashSet<>();
	}
	mBluetoothDevices.clear();
	if (mCachedDevice.getDevice() != null) {
	mBluetoothDevices.add(mCachedDevice.getDevice());
	}
	for (CachedBluetoothDevice cbd : mCachedDevice.getMemberDevice()) {
	mBluetoothDevices.add(cbd.getDevice());
	}
	if (mBluetoothDevices.isEmpty()) {
	Log.d(TAG, "No BT device to register.");
	return;
	}
	Set<BluetoothDevice> errorDevices = new HashSet<>();
	mBluetoothDevices.forEach(bd -> {
	try {
	boolean isSuccess = mBluetoothAdapter.addOnMetadataChangedListener(bd,
	getContext().getMainExecutor(), mMetadataListener);
	if (!isSuccess) {
	Log.e(TAG, bd.getAnonymizedAddress() + ": add into Listener failed");
	errorDevices.add(bd);
	}
	} catch (NullPointerException e) {
	errorDevices.add(bd);
	Log.e(TAG, bd.getAnonymizedAddress() + ":" + e.toString());
	} catch (IllegalArgumentException e) {
	errorDevices.add(bd);
	Log.e(TAG, bd.getAnonymizedAddress() + ":" + e.toString());
	}
	});
	for (BluetoothDevice errorDevice : errorDevices) {
	mBluetoothDevices.remove(errorDevice);
	Log.d(TAG, "mBluetoothDevices remove " + errorDevice.getAnonymizedAddress());
	}
	}

	private void unregisterMetadataChangedListener() {
	if (mBluetoothAdapter == null) {
	Log.d(TAG, "No mBluetoothAdapter");
	return;
	}
	if (mBluetoothDevices == null \|\| mBluetoothDevices.isEmpty()) {
	Log.d(TAG, "No BT device to unregister.");
	return;
	}
	mBluetoothDevices.forEach(bd -> {
	try {
	mBluetoothAdapter.removeOnMetadataChangedListener(bd, mMetadataListener);
	} catch (NullPointerException e) {
	Log.e(TAG, bd.getAnonymizedAddress() + ":" + e.toString());
	} catch (IllegalArgumentException e) {
	Log.e(TAG, bd.getAnonymizedAddress() + ":" + e.toString());
	}
	});
	mBluetoothDevices.clear();
	}

	public CachedBluetoothDevice getBluetoothDevice() {
	return mCachedDevice;
	}

	public void hideSecondTarget(boolean hideSecondTarget) {
	mHideSecondTarget = hideSecondTarget;
	}

	@SuppressWarnings("FutureReturnValueIgnored")
	void onPreferenceAttributesChanged() {
	try {
	ThreadUtils.postOnBackgroundThread(() -> {
	@Nullable String name = mCachedDevice.getName();
	// Null check is done at the framework
	@Nullable String connectionSummary = getConnectionSummary();
	@NonNull Pair<Drawable, String> pair = mCachedDevice.getDrawableWithDescription();
	boolean isBusy = mCachedDevice.isBusy();
	// Device is only visible in the UI if it has a valid name besides MAC address or
	// when user allows showing devices without user-friendly name in developer settings
	boolean isVisible =
	mShowDevicesWithoutNames \|\| mCachedDevice.hasHumanReadableName();

	ThreadUtils.postOnMainThread(() -> {
	/*
	* 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(name);
	setSummary(connectionSummary);
	setIcon(pair.first);
	contentDescription = pair.second;
	// Used to gray out the item
	setEnabled(!isBusy);
	setVisible(isVisible);

	// This could affect ordering, so notify that
	if (mNeedNotifyHierarchyChanged) {
	notifyHierarchyChanged();
	}
	});
	});
	} catch (RejectedExecutionException e) {
	Log.w(TAG, "Handler thread unavailable, skipping getConnectionSummary!");
	}
	}

	@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.settings_button);

	if (deviceDetails != null) {
	deviceDetails.setOnClickListener(this);
	}
	}
	final ImageView imageView = (ImageView) view.findViewById(android.R.id.icon);
	if (imageView != null) {
	imageView.setContentDescription(contentDescription);
	// Set property to prevent Talkback from reading out.
	imageView.setImportantForAccessibility(View.IMPORTANT_FOR_ACCESSIBILITY_NO);
	imageView.setElevation(
	getContext().getResources().getDimension(R.dimen.bt_icon_elevation));
	}
	super.onBindViewHolder(view);
	}

	@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);
	}

	switch (mType) {
	case SortType.TYPE_DEFAULT:
	return mCachedDevice
	.compareTo(((BluetoothDevicePreference) another).mCachedDevice);
	case SortType.TYPE_FIFO:
	return mId > ((BluetoothDevicePreference) another).mId ? 1 : -1;
	default:
	return super.compareTo(another);
	}
	}

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

	final MetricsFeatureProvider metricsFeatureProvider =
	FeatureFactory.getFeatureFactory().getMetricsFeatureProvider();

	if (mCachedDevice.isConnected()) {
	metricsFeatureProvider.action(context,
	SettingsEnums.ACTION_SETTINGS_BLUETOOTH_DISCONNECT);
	askDisconnect();
	} else if (bondState == BluetoothDevice.BOND_BONDED) {
	metricsFeatureProvider.action(context,
	SettingsEnums.ACTION_SETTINGS_BLUETOOTH_CONNECT);
	mCachedDevice.connect();
	} else if (bondState == BluetoothDevice.BOND_NONE) {
	metricsFeatureProvider.action(context,
	SettingsEnums.ACTION_SETTINGS_BLUETOOTH_PAIR);
	if (!mCachedDevice.hasHumanReadableName()) {
	metricsFeatureProvider.action(context,
	SettingsEnums.ACTION_SETTINGS_BLUETOOTH_PAIR_DEVICES_WITHOUT_NAMES);
	}
	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(),
	com.android.settingslib.R.string.bluetooth_pairing_error_message);
	}
	}

	private String getConnectionSummary() {
	String summary = null;
	if (mCachedDevice.getBondState() != BluetoothDevice.BOND_NONE) {
	summary = mCachedDevice.getConnectionSummary();
	}
	return summary;
	}
	}