Files
packages_apps_Settings/src/com/android/settings/bluetooth/AdvancedBluetoothDetailsHeaderController.java
SongFerngWang d140634164 To Add try-catch for MetadataChangedListener to handle the Exception
Since the BT is not enabled, the BluetoothAdapter can't register
the device into Metadata List. Then, the BluetoothAdapter throws the
execption while the UI did the unregister.

Bug: 291207069
Test: build pass
Change-Id: I86e0a3369d7371747a249b34f949d59929afb1c7
2023-08-31 07:10:12 +00:00

582 lines
26 KiB
Java

/*
* Copyright (C) 2019 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.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.ContentResolver;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffColorFilter;
import android.graphics.drawable.Drawable;
import android.net.Uri;
import android.os.Handler;
import android.os.Looper;
import android.provider.MediaStore;
import android.text.TextUtils;
import android.util.Log;
import android.util.Pair;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import androidx.annotation.VisibleForTesting;
import androidx.preference.PreferenceScreen;
import com.android.settings.R;
import com.android.settings.core.BasePreferenceController;
import com.android.settings.fuelgauge.BatteryMeterView;
import com.android.settingslib.bluetooth.BluetoothUtils;
import com.android.settingslib.bluetooth.CachedBluetoothDevice;
import com.android.settingslib.core.lifecycle.LifecycleObserver;
import com.android.settingslib.core.lifecycle.events.OnDestroy;
import com.android.settingslib.core.lifecycle.events.OnStart;
import com.android.settingslib.core.lifecycle.events.OnStop;
import com.android.settingslib.utils.StringUtil;
import com.android.settingslib.utils.ThreadUtils;
import com.android.settingslib.widget.LayoutPreference;
import java.io.IOException;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.TimeUnit;
/**
* This class adds a header with device name and status (connected/disconnected, etc.).
*/
public class AdvancedBluetoothDetailsHeaderController extends BasePreferenceController implements
LifecycleObserver, OnStart, OnStop, OnDestroy, CachedBluetoothDevice.Callback {
private static final String TAG = "AdvancedBtHeaderCtrl";
private static final int LOW_BATTERY_LEVEL = 15;
private static final int CASE_LOW_BATTERY_LEVEL = 19;
private static final boolean DEBUG = Log.isLoggable(TAG, Log.DEBUG);
private static final String PATH = "time_remaining";
private static final String QUERY_PARAMETER_ADDRESS = "address";
private static final String QUERY_PARAMETER_BATTERY_ID = "battery_id";
private static final String QUERY_PARAMETER_BATTERY_LEVEL = "battery_level";
private static final String QUERY_PARAMETER_TIMESTAMP = "timestamp";
private static final String BATTERY_ESTIMATE = "battery_estimate";
private static final String ESTIMATE_READY = "estimate_ready";
private static final String DATABASE_ID = "id";
private static final String DATABASE_BLUETOOTH = "Bluetooth";
private static final long TIME_OF_HOUR = TimeUnit.SECONDS.toMillis(3600);
private static final long TIME_OF_MINUTE = TimeUnit.SECONDS.toMillis(60);
private static final int LEFT_DEVICE_ID = 1;
private static final int RIGHT_DEVICE_ID = 2;
private static final int CASE_DEVICE_ID = 3;
private static final int MAIN_DEVICE_ID = 4;
private static final float HALF_ALPHA = 0.5f;
@VisibleForTesting
LayoutPreference mLayoutPreference;
@VisibleForTesting
final Map<String, Bitmap> mIconCache;
private CachedBluetoothDevice mCachedDevice;
private Set<BluetoothDevice> mBluetoothDevices;
@VisibleForTesting
BluetoothAdapter mBluetoothAdapter;
@VisibleForTesting
Handler mHandler = new Handler(Looper.getMainLooper());
@VisibleForTesting
boolean mIsLeftDeviceEstimateReady;
@VisibleForTesting
boolean mIsRightDeviceEstimateReady;
@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)));
refresh();
}
};
public AdvancedBluetoothDetailsHeaderController(Context context, String prefKey) {
super(context, prefKey);
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
mIconCache = new HashMap<>();
}
@Override
public int getAvailabilityStatus() {
if (mCachedDevice == null) {
return CONDITIONALLY_UNAVAILABLE;
}
return BluetoothUtils.isAdvancedDetailsHeader(mCachedDevice.getDevice())
? AVAILABLE : CONDITIONALLY_UNAVAILABLE;
}
@Override
public void displayPreference(PreferenceScreen screen) {
super.displayPreference(screen);
mLayoutPreference = screen.findPreference(getPreferenceKey());
mLayoutPreference.setVisible(isAvailable());
}
@Override
public void onStart() {
if (!isAvailable()) {
return;
}
registerBluetoothDevice();
refresh();
}
@Override
public void onStop() {
unRegisterBluetoothDevice();
}
@Override
public void onDestroy() {
// Destroy icon bitmap associated with this header
for (Bitmap bitmap : mIconCache.values()) {
if (bitmap != null) {
bitmap.recycle();
}
}
mIconCache.clear();
}
public void init(CachedBluetoothDevice cachedBluetoothDevice) {
mCachedDevice = cachedBluetoothDevice;
}
private void registerBluetoothDevice() {
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());
}
mCachedDevice.getMemberDevice().forEach(cbd -> {
if (cbd != null) {
mBluetoothDevices.add(cbd.getDevice());
}
});
if (mBluetoothDevices.isEmpty()) {
Log.d(TAG, "No BT device to register.");
return;
}
mCachedDevice.registerCallback(this);
Set<BluetoothDevice> errorDevices = new HashSet<>();
mBluetoothDevices.forEach(bd -> {
try {
boolean isSuccess = mBluetoothAdapter.addOnMetadataChangedListener(bd,
mContext.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 unRegisterBluetoothDevice() {
if (mBluetoothAdapter == null) {
Log.d(TAG, "No mBluetoothAdapter");
return;
}
if (mBluetoothDevices == null || mBluetoothDevices.isEmpty()) {
Log.d(TAG, "No BT device to unregister.");
return;
}
mCachedDevice.unregisterCallback(this);
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();
}
@VisibleForTesting
void refresh() {
if (mLayoutPreference != null && mCachedDevice != null) {
final TextView title = mLayoutPreference.findViewById(R.id.entity_header_title);
title.setText(mCachedDevice.getName());
final TextView summary = mLayoutPreference.findViewById(R.id.entity_header_summary);
if (!mCachedDevice.isConnected() || mCachedDevice.isBusy()) {
summary.setText(mCachedDevice.getConnectionSummary(true /* shortSummary */));
updateDisconnectLayout();
return;
}
final BluetoothDevice device = mCachedDevice.getDevice();
final String deviceType = BluetoothUtils.getStringMetaData(device,
BluetoothDevice.METADATA_DEVICE_TYPE);
if (TextUtils.equals(deviceType,
BluetoothDevice.DEVICE_TYPE_UNTETHERED_HEADSET)
|| BluetoothUtils.getBooleanMetaData(device,
BluetoothDevice.METADATA_IS_UNTETHERED_HEADSET)) {
summary.setText(mCachedDevice.getConnectionSummary(true /* shortSummary */));
updateSubLayout(mLayoutPreference.findViewById(R.id.layout_left),
BluetoothDevice.METADATA_UNTETHERED_LEFT_ICON,
BluetoothDevice.METADATA_UNTETHERED_LEFT_BATTERY,
BluetoothDevice.METADATA_UNTETHERED_LEFT_LOW_BATTERY_THRESHOLD,
BluetoothDevice.METADATA_UNTETHERED_LEFT_CHARGING,
R.string.bluetooth_left_name,
LEFT_DEVICE_ID);
updateSubLayout(mLayoutPreference.findViewById(R.id.layout_middle),
BluetoothDevice.METADATA_UNTETHERED_CASE_ICON,
BluetoothDevice.METADATA_UNTETHERED_CASE_BATTERY,
BluetoothDevice.METADATA_UNTETHERED_CASE_LOW_BATTERY_THRESHOLD,
BluetoothDevice.METADATA_UNTETHERED_CASE_CHARGING,
R.string.bluetooth_middle_name,
CASE_DEVICE_ID);
updateSubLayout(mLayoutPreference.findViewById(R.id.layout_right),
BluetoothDevice.METADATA_UNTETHERED_RIGHT_ICON,
BluetoothDevice.METADATA_UNTETHERED_RIGHT_BATTERY,
BluetoothDevice.METADATA_UNTETHERED_RIGHT_LOW_BATTERY_THRESHOLD,
BluetoothDevice.METADATA_UNTETHERED_RIGHT_CHARGING,
R.string.bluetooth_right_name,
RIGHT_DEVICE_ID);
showBothDevicesBatteryPredictionIfNecessary();
} else {
mLayoutPreference.findViewById(R.id.layout_left).setVisibility(View.GONE);
mLayoutPreference.findViewById(R.id.layout_right).setVisibility(View.GONE);
summary.setText(mCachedDevice.getConnectionSummary(
BluetoothUtils.getIntMetaData(device, BluetoothDevice.METADATA_MAIN_BATTERY)
!= BluetoothUtils.META_INT_ERROR));
updateSubLayout(mLayoutPreference.findViewById(R.id.layout_middle),
BluetoothDevice.METADATA_MAIN_ICON,
BluetoothDevice.METADATA_MAIN_BATTERY,
BluetoothDevice.METADATA_MAIN_LOW_BATTERY_THRESHOLD,
BluetoothDevice.METADATA_MAIN_CHARGING,
/* titleResId */ 0,
MAIN_DEVICE_ID);
}
}
}
@VisibleForTesting
Drawable createBtBatteryIcon(Context context, int level, boolean charging) {
final BatteryMeterView.BatteryMeterDrawable drawable =
new BatteryMeterView.BatteryMeterDrawable(context,
context.getColor(com.android.settingslib.R.color.meter_background_color),
context.getResources().getDimensionPixelSize(
R.dimen.advanced_bluetooth_battery_meter_width),
context.getResources().getDimensionPixelSize(
R.dimen.advanced_bluetooth_battery_meter_height));
drawable.setBatteryLevel(level);
drawable.setColorFilter(new PorterDuffColorFilter(
com.android.settings.Utils.getColorAttrDefaultColor(context,
android.R.attr.colorControlNormal),
PorterDuff.Mode.SRC));
drawable.setCharging(charging);
return drawable;
}
private void updateSubLayout(LinearLayout linearLayout, int iconMetaKey, int batteryMetaKey,
int lowBatteryMetaKey, int chargeMetaKey, int titleResId, int deviceId) {
if (linearLayout == null) {
return;
}
final BluetoothDevice bluetoothDevice = mCachedDevice.getDevice();
final String iconUri = BluetoothUtils.getStringMetaData(bluetoothDevice, iconMetaKey);
final ImageView imageView = linearLayout.findViewById(R.id.header_icon);
if (iconUri != null) {
updateIcon(imageView, iconUri);
} else {
final Pair<Drawable, String> pair =
BluetoothUtils.getBtRainbowDrawableWithDescription(mContext, mCachedDevice);
imageView.setImageDrawable(pair.first);
imageView.setContentDescription(pair.second);
}
final int batteryLevel = BluetoothUtils.getIntMetaData(bluetoothDevice, batteryMetaKey);
final boolean charging = BluetoothUtils.getBooleanMetaData(bluetoothDevice, chargeMetaKey);
int lowBatteryLevel = BluetoothUtils.getIntMetaData(bluetoothDevice,
lowBatteryMetaKey);
if (lowBatteryLevel == BluetoothUtils.META_INT_ERROR) {
if (batteryMetaKey == BluetoothDevice.METADATA_UNTETHERED_CASE_BATTERY) {
lowBatteryLevel = CASE_LOW_BATTERY_LEVEL;
} else {
lowBatteryLevel = LOW_BATTERY_LEVEL;
}
}
Log.d(TAG, "buletoothDevice: " + bluetoothDevice.getAnonymizedAddress()
+ ", updateSubLayout() icon : " + iconMetaKey + ", battery : " + batteryMetaKey
+ ", charge : " + chargeMetaKey + ", batteryLevel : " + batteryLevel
+ ", charging : " + charging + ", iconUri : " + iconUri
+ ", lowBatteryLevel : " + lowBatteryLevel);
if (deviceId == LEFT_DEVICE_ID || deviceId == RIGHT_DEVICE_ID) {
showBatteryPredictionIfNecessary(linearLayout, deviceId, batteryLevel);
}
final TextView batterySummaryView = linearLayout.findViewById(R.id.bt_battery_summary);
if (isUntetheredHeadset(bluetoothDevice)) {
if (batteryLevel != BluetoothUtils.META_INT_ERROR) {
linearLayout.setVisibility(View.VISIBLE);
batterySummaryView.setText(
com.android.settings.Utils.formatPercentage(batteryLevel));
batterySummaryView.setVisibility(View.VISIBLE);
showBatteryIcon(linearLayout, batteryLevel, lowBatteryLevel, charging);
} else {
if (deviceId == MAIN_DEVICE_ID) {
linearLayout.setVisibility(View.VISIBLE);
linearLayout.findViewById(R.id.bt_battery_icon).setVisibility(View.GONE);
int level = bluetoothDevice.getBatteryLevel();
if (level != BluetoothDevice.BATTERY_LEVEL_UNKNOWN
&& level != BluetoothDevice.BATTERY_LEVEL_BLUETOOTH_OFF) {
batterySummaryView.setText(
com.android.settings.Utils.formatPercentage(level));
batterySummaryView.setVisibility(View.VISIBLE);
} else {
batterySummaryView.setVisibility(View.GONE);
}
} else {
// Hide it if it doesn't have battery information
linearLayout.setVisibility(View.GONE);
}
}
} else {
if (batteryLevel != BluetoothUtils.META_INT_ERROR) {
linearLayout.setVisibility(View.VISIBLE);
batterySummaryView.setText(
com.android.settings.Utils.formatPercentage(batteryLevel));
batterySummaryView.setVisibility(View.VISIBLE);
showBatteryIcon(linearLayout, batteryLevel, lowBatteryLevel, charging);
} else {
batterySummaryView.setVisibility(View.GONE);
}
}
final TextView textView = linearLayout.findViewById(R.id.header_title);
if (deviceId == MAIN_DEVICE_ID) {
textView.setVisibility(View.GONE);
} else {
textView.setText(titleResId);
textView.setVisibility(View.VISIBLE);
}
}
private boolean isUntetheredHeadset(BluetoothDevice bluetoothDevice) {
return BluetoothUtils.getBooleanMetaData(bluetoothDevice,
BluetoothDevice.METADATA_IS_UNTETHERED_HEADSET)
|| TextUtils.equals(BluetoothUtils.getStringMetaData(bluetoothDevice,
BluetoothDevice.METADATA_DEVICE_TYPE),
BluetoothDevice.DEVICE_TYPE_UNTETHERED_HEADSET);
}
private void showBatteryPredictionIfNecessary(LinearLayout linearLayout, int batteryId,
int batteryLevel) {
ThreadUtils.postOnBackgroundThread(() -> {
final Uri contentUri = new Uri.Builder()
.scheme(ContentResolver.SCHEME_CONTENT)
.authority(mContext.getString(R.string.config_battery_prediction_authority))
.appendPath(PATH)
.appendPath(DATABASE_ID)
.appendPath(DATABASE_BLUETOOTH)
.appendQueryParameter(QUERY_PARAMETER_ADDRESS, mCachedDevice.getAddress())
.appendQueryParameter(QUERY_PARAMETER_BATTERY_ID, String.valueOf(batteryId))
.appendQueryParameter(QUERY_PARAMETER_BATTERY_LEVEL,
String.valueOf(batteryLevel))
.appendQueryParameter(QUERY_PARAMETER_TIMESTAMP,
String.valueOf(System.currentTimeMillis()))
.build();
final String[] columns = new String[] {BATTERY_ESTIMATE, ESTIMATE_READY};
final Cursor cursor =
mContext.getContentResolver().query(contentUri, columns, null, null, null);
if (cursor == null) {
Log.w(TAG, "showBatteryPredictionIfNecessary() cursor is null!");
return;
}
try {
for (cursor.moveToFirst(); !cursor.isAfterLast(); cursor.moveToNext()) {
final int estimateReady =
cursor.getInt(cursor.getColumnIndex(ESTIMATE_READY));
final long batteryEstimate =
cursor.getLong(cursor.getColumnIndex(BATTERY_ESTIMATE));
if (DEBUG) {
Log.d(TAG, "showBatteryTimeIfNecessary() batteryId : " + batteryId
+ ", ESTIMATE_READY : " + estimateReady
+ ", BATTERY_ESTIMATE : " + batteryEstimate);
}
showBatteryPredictionIfNecessary(estimateReady, batteryEstimate, linearLayout);
if (batteryId == LEFT_DEVICE_ID) {
mIsLeftDeviceEstimateReady = estimateReady == 1;
} else if (batteryId == RIGHT_DEVICE_ID) {
mIsRightDeviceEstimateReady = estimateReady == 1;
}
}
} finally {
cursor.close();
}
});
}
@VisibleForTesting
void showBatteryPredictionIfNecessary(int estimateReady, long batteryEstimate,
LinearLayout linearLayout) {
ThreadUtils.postOnMainThread(() -> {
final TextView textView = linearLayout.findViewById(R.id.bt_battery_prediction);
if (estimateReady == 1) {
textView.setText(
StringUtil.formatElapsedTime(
mContext,
batteryEstimate,
/* withSeconds */ false,
/* collapseTimeUnit */ false));
} else {
textView.setVisibility(View.GONE);
}
});
}
@VisibleForTesting
void showBothDevicesBatteryPredictionIfNecessary() {
TextView leftDeviceTextView =
mLayoutPreference.findViewById(R.id.layout_left)
.findViewById(R.id.bt_battery_prediction);
TextView rightDeviceTextView =
mLayoutPreference.findViewById(R.id.layout_right)
.findViewById(R.id.bt_battery_prediction);
boolean isBothDevicesEstimateReady =
mIsLeftDeviceEstimateReady && mIsRightDeviceEstimateReady;
int visibility = isBothDevicesEstimateReady ? View.VISIBLE : View.GONE;
ThreadUtils.postOnMainThread(() -> {
leftDeviceTextView.setVisibility(visibility);
rightDeviceTextView.setVisibility(visibility);
});
}
private void showBatteryIcon(LinearLayout linearLayout, int level, int lowBatteryLevel,
boolean charging) {
final boolean enableLowBattery = level <= lowBatteryLevel && !charging;
final ImageView imageView = linearLayout.findViewById(R.id.bt_battery_icon);
if (enableLowBattery) {
imageView.setImageDrawable(mContext.getDrawable(R.drawable.ic_battery_alert_24dp));
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
mContext.getResources().getDimensionPixelSize(
R.dimen.advanced_bluetooth_battery_width),
mContext.getResources().getDimensionPixelSize(
R.dimen.advanced_bluetooth_battery_height));
layoutParams.rightMargin = mContext.getResources().getDimensionPixelSize(
R.dimen.advanced_bluetooth_battery_right_margin);
imageView.setLayoutParams(layoutParams);
} else {
imageView.setImageDrawable(createBtBatteryIcon(mContext, level, charging));
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
imageView.setLayoutParams(layoutParams);
}
imageView.setVisibility(View.VISIBLE);
}
private void updateDisconnectLayout() {
mLayoutPreference.findViewById(R.id.layout_left).setVisibility(View.GONE);
mLayoutPreference.findViewById(R.id.layout_right).setVisibility(View.GONE);
// Hide title, battery icon and battery summary
final LinearLayout linearLayout = mLayoutPreference.findViewById(R.id.layout_middle);
linearLayout.setVisibility(View.VISIBLE);
linearLayout.findViewById(R.id.header_title).setVisibility(View.GONE);
linearLayout.findViewById(R.id.bt_battery_summary).setVisibility(View.GONE);
linearLayout.findViewById(R.id.bt_battery_icon).setVisibility(View.GONE);
// Only show bluetooth icon
final BluetoothDevice bluetoothDevice = mCachedDevice.getDevice();
final String iconUri = BluetoothUtils.getStringMetaData(bluetoothDevice,
BluetoothDevice.METADATA_MAIN_ICON);
if (DEBUG) {
Log.d(TAG, "updateDisconnectLayout() iconUri : " + iconUri);
}
if (iconUri != null) {
final ImageView imageView = linearLayout.findViewById(R.id.header_icon);
updateIcon(imageView, iconUri);
}
}
/**
* Update icon by {@code iconUri}. If icon exists in cache, use it; otherwise extract it
* from uri in background thread and update it in main thread.
*/
@VisibleForTesting
void updateIcon(ImageView imageView, String iconUri) {
if (mIconCache.containsKey(iconUri)) {
imageView.setAlpha(1f);
imageView.setImageBitmap(mIconCache.get(iconUri));
return;
}
imageView.setAlpha(HALF_ALPHA);
ThreadUtils.postOnBackgroundThread(() -> {
final Uri uri = Uri.parse(iconUri);
try {
mContext.getContentResolver().takePersistableUriPermission(uri,
Intent.FLAG_GRANT_READ_URI_PERMISSION);
final Bitmap bitmap = MediaStore.Images.Media.getBitmap(
mContext.getContentResolver(), uri);
ThreadUtils.postOnMainThread(() -> {
mIconCache.put(iconUri, bitmap);
imageView.setAlpha(1f);
imageView.setImageBitmap(bitmap);
});
} catch (IOException e) {
Log.e(TAG, "Failed to get bitmap for: " + iconUri, e);
} catch (SecurityException e) {
Log.e(TAG, "Failed to take persistable permission for: " + uri, e);
}
});
}
@Override
public void onDeviceAttributesChanged() {
if (mCachedDevice != null) {
refresh();
}
}
}