version:1.2

fix:
update:更新app name，增加快捷控制

app/src/main/java/com/uiuios/aios/activity/ControlActivity.java

@@ -0,0 +1,483 @@
+package com.uiuios.aios.activity;
+
+import android.bluetooth.BluetoothAdapter;
+import android.bluetooth.BluetoothDevice;
+import android.content.BroadcastReceiver;
+import android.content.ContentResolver;
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.hardware.camera2.CameraAccessException;
+import android.hardware.camera2.CameraCharacteristics;
+import android.hardware.camera2.CameraManager;
+import android.media.AudioManager;
+import android.net.ConnectivityManager;
+import android.net.NetworkInfo;
+import android.net.wifi.WifiInfo;
+import android.net.wifi.WifiManager;
+import android.os.Bundle;
+import android.provider.Settings;
+import android.util.Log;
+import android.view.View;
+import android.widget.SeekBar;
+import android.widget.TextView;
+
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.constraintlayout.widget.ConstraintLayout;
+
+import com.baidu.location.BDAbstractLocationListener;
+import com.baidu.location.BDLocation;
+import com.baidu.location.LocationClient;
+import com.uiuios.aios.R;
+import com.uiuios.aios.manager.AmapManager;
+import com.uiuios.aios.utils.BrightnessUtils;
+
+import java.util.Arrays;
+import java.util.List;
+
+import butterknife.BindView;
+import butterknife.ButterKnife;
+
+public class ControlActivity extends AppCompatActivity {
+    private static final String TAG = ControlActivity.class.getSimpleName();
+
+    @BindView(R.id.tv_wifi)
+    TextView tv_wifi;
+    @BindView(R.id.tv_wifi_ssid)
+    TextView tv_wifi_ssid;
+    @BindView(R.id.tv_bt)
+    TextView tv_bt;
+    @BindView(R.id.tv_bt_ssid)
+    TextView tv_bt_ssid;
+
+    @BindView(R.id.tv_font_size)
+    TextView tv_font_size;
+    @BindView(R.id.seekBar)
+    SeekBar seekBar;
+    @BindView(R.id.seekbar_brightness)
+    SeekBar seekbar_brightness;
+    @BindView(R.id.seekbar_sound)
+    SeekBar seekbar_sound;
+
+    @BindView(R.id.tv_sound)
+    TextView tv_sound;
+
+    @BindView(R.id.tv_battery)
+    TextView tv_battery;
+    @BindView(R.id.tv_electricity)
+    TextView tv_electricity;
+    @BindView(R.id.tv_flashlight)
+    TextView tv_flashlight;
+    @BindView(R.id.tv_flashlight_switch)
+    TextView tv_flashlight_switch;
+
+    @BindView(R.id.tv_brightness)
+    TextView tv_brightness;
+    @BindView(R.id.tv_location)
+    TextView tv_location;
+
+    @BindView(R.id.cl_wifi)
+    ConstraintLayout cl_wifi;
+    @BindView(R.id.cl_bt)
+    ConstraintLayout cl_bt;
+    @BindView(R.id.cl_battery)
+    ConstraintLayout cl_battery;
+    @BindView(R.id.cl_flashlight)
+    ConstraintLayout cl_flashlight;
+
+
+    private ContentResolver crv;
+    private static final String ACTION_FLASHLIGHT_CHANGED =
+            "com.android.settings.flashlight.action.FLASHLIGHT_CHANGED";
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_control);
+        ButterKnife.bind(this);
+        crv = getContentResolver();
+        initView();
+    }
+
+    private void initView() {
+        getWifi();
+        registerReceivers();
+        getBluetooth();
+        registerBluetoothReceiver();
+        getFlashlight();
+        getFontSize();
+        getLocation();
+        getBrightness();
+        getSound();
+    }
+
+    private void getWifi() {
+        cl_wifi.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                startActivity(new Intent(android.provider.Settings.ACTION_WIFI_SETTINGS));
+            }
+        });
+        if (isWifiEnabled()) {
+            tv_wifi_ssid.setText(getSSID());
+            cl_wifi.setBackground(getDrawable(R.drawable.control_background_item));
+        } else {
+            tv_wifi_ssid.setText("未连接");
+            cl_wifi.setBackground(getDrawable(R.drawable.control_background_item_dis));
+        }
+    }
+
+    public boolean isWifiEnabled() {
+        WifiManager wifiMgr = (WifiManager) getSystemService(Context.WIFI_SERVICE);
+        if (wifiMgr.getWifiState() == WifiManager.WIFI_STATE_ENABLED) {
+            ConnectivityManager connManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
+            NetworkInfo wifiInfo = connManager
+                    .getNetworkInfo(ConnectivityManager.TYPE_WIFI);
+            return wifiInfo.isConnected();
+        } else {
+            return false;
+        }
+    }
+
+    private WifiReceiver mWifiReceiver;
+
+    private void registerReceivers() {
+        registerWiFiReceiver();
+    }
+
+    private void registerWiFiReceiver() {
+        if (mWifiReceiver == null) {
+            mWifiReceiver = new WifiReceiver();
+        }
+        IntentFilter filter = new IntentFilter();
+        filter.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION);
+        filter.addAction(WifiManager.WIFI_STATE_CHANGED_ACTION);
+        filter.addAction(WifiManager.RSSI_CHANGED_ACTION);
+        filter.addAction(WifiManager.NETWORK_IDS_CHANGED_ACTION);
+        filter.addAction(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION);
+        filter.addAction(WifiManager.CONFIGURED_NETWORKS_CHANGED_ACTION);
+        filter.addAction(WifiManager.LINK_CONFIGURATION_CHANGED_ACTION);
+        filter.addAction(WifiManager.SUPPLICANT_STATE_CHANGED_ACTION);
+        filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
+        registerReceiver(mWifiReceiver, filter);
+    }
+
+    public class WifiReceiver extends BroadcastReceiver {
+        private static final String TAG = "wifiReceiver";
+
+        @Override
+        public void onReceive(Context context, Intent intent) {
+            switch (intent.getAction()) {
+                case WifiManager.RSSI_CHANGED_ACTION:
+                    Log.e(TAG, "wifi信号强度变化");
+                    break;
+                //wifi连接上与否
+                case WifiManager.NETWORK_STATE_CHANGED_ACTION:
+                    NetworkInfo info = intent.getParcelableExtra(WifiManager.EXTRA_NETWORK_INFO);
+                    if (info.getState().equals(NetworkInfo.State.DISCONNECTED)) {
+                        Log.e(TAG, "wifi断开");
+                        tv_wifi_ssid.setText("未连接");
+                        cl_wifi.setBackground(getDrawable(R.drawable.control_background_item_dis));
+                    } else if (info.getState().equals(NetworkInfo.State.CONNECTED)) {
+                        WifiManager wifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
+                        WifiInfo wifiInfo = wifiManager.getConnectionInfo();
+                        //获取当前wifi名称
+                        String newSSID = wifiInfo.getSSID();
+                        tv_wifi_ssid.setText(newSSID);
+                        cl_wifi.setBackground(getDrawable(R.drawable.control_background_item));
+                    }
+                    break;
+                //wifi打开与否
+                case WifiManager.WIFI_STATE_CHANGED_ACTION:
+                    int wifistate = intent.getIntExtra(WifiManager.EXTRA_WIFI_STATE, WifiManager.WIFI_STATE_DISABLED);
+                    if (wifistate == WifiManager.WIFI_STATE_DISABLED) {
+                        Log.e(TAG, "系统关闭wifi");
+                        tv_wifi_ssid.setText("关");
+                        cl_wifi.setBackground(getDrawable(R.drawable.control_background_item_dis));
+                    } else if (wifistate == WifiManager.WIFI_STATE_ENABLED) {
+                        Log.e(TAG, "系统开启wifi");
+                    }
+                    break;
+                default:
+            }
+        }
+    }
+
+    /**
+     * 获取当前连接WIFI的SSID
+     */
+    public String getSSID() {
+        WifiManager wm = (WifiManager) getSystemService(WIFI_SERVICE);
+        if (wm != null) {
+            WifiInfo winfo = wm.getConnectionInfo();
+            if (winfo != null) {
+                String s = winfo.getSSID();
+                if (s.length() > 2 && s.charAt(0) == '"' && s.charAt(s.length() - 1) == '"') {
+                    return s.substring(1, s.length() - 1);
+                }
+            }
+        }
+        return "";
+    }
+
+    private void getBluetooth() {
+        cl_bt.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                startActivity(new Intent(Settings.ACTION_BLUETOOTH_SETTINGS));
+            }
+        });
+    }
+
+    private BluetoothMonitorReceiver bleListenerReceiver;
+
+    private void registerBluetoothReceiver() {
+        bleListenerReceiver = new BluetoothMonitorReceiver();
+        IntentFilter intentFilter = new IntentFilter();
+        // 监视蓝牙关闭和打开的状态
+        intentFilter.addAction(BluetoothAdapter.ACTION_STATE_CHANGED);
+        // 监视蓝牙设备与APP连接的状态
+        intentFilter.addAction(BluetoothDevice.ACTION_ACL_DISCONNECTED);
+        intentFilter.addAction(BluetoothDevice.ACTION_ACL_CONNECTED);
+        // 注册广播
+        registerReceiver(this.bleListenerReceiver, intentFilter);
+    }
+
+    public class BluetoothMonitorReceiver extends BroadcastReceiver {
+        @Override
+        public void onReceive(Context context, Intent intent) {
+            String action = intent.getAction();
+            if (action != null) {
+                switch (action) {
+                    case BluetoothAdapter.ACTION_STATE_CHANGED:
+                        int blueState = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, 0);
+                        switch (blueState) {
+                            case BluetoothAdapter.STATE_TURNING_ON:
+                                tv_bt_ssid.setText("蓝牙正在打开");
+                                cl_bt.setBackground(getDrawable(R.drawable.control_background_item));
+                                break;
+                            case BluetoothAdapter.STATE_ON:
+                                tv_bt_ssid.setText("蓝牙已经打开");
+                                cl_bt.setBackground(getDrawable(R.drawable.control_background_item));
+                                break;
+                            case BluetoothAdapter.STATE_TURNING_OFF:
+                                tv_bt_ssid.setText("蓝牙正在关闭");
+                                cl_bt.setBackground(getDrawable(R.drawable.control_background_item));
+                                break;
+                            case BluetoothAdapter.STATE_OFF:
+                                tv_bt_ssid.setText("关");
+                                cl_bt.setBackground(getDrawable(R.drawable.control_background_item_dis));
+                                break;
+                            default:
+                        }
+                        break;
+                    case BluetoothDevice.ACTION_ACL_CONNECTED:
+                        tv_bt_ssid.setText("蓝牙设备已连接");
+                        cl_bt.setBackground(getDrawable(R.drawable.control_background_item));
+                        break;
+                    case BluetoothDevice.ACTION_ACL_DISCONNECTED:
+                        tv_bt_ssid.setText("蓝牙设备已断开");
+                        cl_bt.setBackground(getDrawable(R.drawable.control_background_item_dis));
+                        break;
+                    default:
+                }
+
+            }
+        }
+    }
+
+    private void getFlashlight() {
+        if (isFlashlightEnabled()) {
+            tv_flashlight_switch.setText("开");
+        } else {
+            tv_flashlight_switch.setText("关");
+        }
+        cl_flashlight.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                if (isFlashlightEnabled()) {
+                    Settings.Secure.putInt(crv, Settings.Secure.FLASHLIGHT_ENABLED, 0);
+                    sendBroadcast(new Intent(ACTION_FLASHLIGHT_CHANGED));
+                    tv_flashlight_switch.setText("关");
+                } else {
+                    Settings.Secure.putInt(crv, Settings.Secure.FLASHLIGHT_ENABLED, 1);
+                    sendBroadcast(new Intent(ACTION_FLASHLIGHT_CHANGED));
+                    tv_flashlight_switch.setText("开");
+                }
+            }
+        });
+    }
+
+
+    private boolean isFlashlightAvailable() {
+        int defaultAvailability = 0;
+        try {
+            // check if there is a flash unit
+            if (getCameraId(this) != null) {
+                defaultAvailability = 1;
+            }
+        } catch (CameraAccessException e) {
+            Log.e(TAG, "Error getting camera id.", e);
+        }
+        return Settings.Secure.getInt(crv, Settings.Secure.FLASHLIGHT_AVAILABLE, defaultAvailability) == 1;
+    }
+
+    private static String getCameraId(Context context) throws CameraAccessException {
+        final CameraManager cameraManager = context.getSystemService(CameraManager.class);
+        final String[] ids = cameraManager.getCameraIdList();
+        for (String id : ids) {
+            CameraCharacteristics c = cameraManager.getCameraCharacteristics(id);
+            Boolean flashAvailable = c.get(CameraCharacteristics.FLASH_INFO_AVAILABLE);
+            Integer lensFacing = c.get(CameraCharacteristics.LENS_FACING);
+            if (flashAvailable != null && flashAvailable
+                    && lensFacing != null && lensFacing == CameraCharacteristics.LENS_FACING_BACK) {
+                return id;
+            }
+        }
+        return null;
+    }
+
+    private boolean isFlashlightEnabled() {
+        return Settings.Secure.getInt(crv, Settings.Secure.FLASHLIGHT_ENABLED, 0) == 1;
+    }
+
+    private void getFontSize() {
+        float fontScale = Settings.System.getFloat(crv, Settings.System.FONT_SCALE, 0.0f);
+        Log.e(TAG, "getHardware: fontScale = " + fontScale);
+        List<String> mEntries = Arrays.asList(getResources().getStringArray(R.array.entries_font_size));
+        List<String> strEntryValues = Arrays.asList(getResources().getStringArray(R.array.entryvalues_font_size));
+        String font_size;
+        int index = strEntryValues.indexOf(String.valueOf(fontScale));
+        if (index == -1) {
+            font_size = "默认";
+        } else {
+            font_size = mEntries.get(index);
+        }
+        tv_font_size.setText(font_size);
+        seekBar.setProgress(index);
+        seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
+            @Override
+            public void onProgressChanged(SeekBar seekBar, int i, boolean b) {
+                Settings.System.putFloat(crv, Settings.System.FONT_SCALE, Float.parseFloat(strEntryValues.get(i)));
+            }
+
+            @Override
+            public void onStartTrackingTouch(SeekBar seekBar) {
+
+            }
+
+            @Override
+            public void onStopTrackingTouch(SeekBar seekBar) {
+
+            }
+        });
+    }
+
+    private void getLocation() {
+        BDLocation bdLocation = AmapManager.getInstance().getNowMapLocation();
+        if (bdLocation != null) {
+            if (bdLocation.getLocType() == BDLocation.TypeGpsLocation // GPS定位结果
+                    || bdLocation.getLocType() == BDLocation.TypeNetWorkLocation  // 网络定位结果
+                    || bdLocation.getLocType() == BDLocation.TypeOffLineLocation) {// 离线定位结果
+                tv_location.setText(bdLocation.getAddrStr());
+            } else {
+                tv_location.setText("未知");
+            }
+        } else {
+            tv_location.setText("定位失败");
+        }
+        LocationClient locationClient = AmapManager.getInstance().getLocationClient();
+        locationClient.stop();
+        locationClient.start();
+        locationClient.registerLocationListener(new BDAbstractLocationListener() {
+            @Override
+            public void onReceiveLocation(BDLocation bdLocation) {
+                switch (bdLocation.getLocType()) {
+                    case BDLocation.TypeGpsLocation:// GPS定位结果
+                    case BDLocation.TypeNetWorkLocation:// 网络定位结果
+                    case BDLocation.TypeOffLineLocation:// 离线定位结果
+                        tv_location.setText(bdLocation.getAddrStr());
+                        break;
+                    default:
+                        tv_location.setText("定位失败");
+                        break;
+                }
+            }
+        });
+    }
+
+    private void getBrightness() {
+        seekbar_brightness.setMin(1);
+        seekbar_brightness.setMax(255);
+        //亮度
+        int brightness = Settings.System.getInt(crv, Settings.System.SCREEN_BRIGHTNESS, 1);
+        seekbar_brightness.setProgress(brightness);
+        Log.e(TAG, "getHardware: brightness = " + brightness);
+        int gamma = BrightnessUtils.convertLinearToGamma(brightness, 1, 255);
+        Log.e(TAG, "getHardware: gamma = " + gamma);
+        long percentage = Math.round((((double) gamma / 65535) * 100f));
+        tv_brightness.setText(percentage + "%");
+        Log.e(TAG, "getHardware: percentage = " + percentage);
+        seekbar_brightness.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
+            @Override
+            public void onProgressChanged(SeekBar seekBar, int i, boolean b) {
+                Settings.System.putInt(crv, Settings.System.SCREEN_BRIGHTNESS, i);
+                int gamma = BrightnessUtils.convertLinearToGamma(i, 1, 255);
+                long percentage = Math.round((((double) gamma / 65535) * 100f));
+                tv_brightness.setText(percentage + "%");
+            }
+
+            @Override
+            public void onStartTrackingTouch(SeekBar seekBar) {
+
+            }
+
+            @Override
+            public void onStopTrackingTouch(SeekBar seekBar) {
+
+            }
+        });
+    }
+
+    private AudioManager mAudioManager;
+
+    private void getSound() {
+        mAudioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
+        //最大音量
+        int maxVolume = mAudioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
+        seekbar_sound.setMax(maxVolume);
+        Log.e(TAG, "getHardware: maxVolume = " + maxVolume);
+        //音量
+        int streamVolume = mAudioManager.getStreamVolume(AudioManager.STREAM_MUSIC);
+        seekbar_sound.setProgress(streamVolume);
+        Log.e(TAG, "getHardware: streamVolume = " + streamVolume);
+        int currentVolume = (int) (((double) streamVolume / (double) maxVolume) * 100f);
+        Log.e(TAG, "getHardware: currentVolume = " + currentVolume);
+        tv_sound.setText(currentVolume + "%");
+        seekbar_sound.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
+            @Override
+            public void onProgressChanged(SeekBar seekBar, int i, boolean b) {
+                int volume = (int) (((double) i / (double) maxVolume) * 100f);
+                tv_sound.setText(volume + "%");
+                mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC, i, 0);
+
+            }
+
+            @Override
+            public void onStartTrackingTouch(SeekBar seekBar) {
+
+            }
+
+            @Override
+            public void onStopTrackingTouch(SeekBar seekBar) {
+
+            }
+        });
+    }
+
+    @Override
+    protected void onDestroy() {
+        super.onDestroy();
+        if (mWifiReceiver != null) unregisterReceiver(mWifiReceiver);
+    }
+}

app/src/main/java/com/uiuios/aios/fragment/CustomFragment.java

@@ -47,6 +47,7 @@ import com.qweather.sdk.view.QWeather;
 import com.tencent.mmkv.MMKV;
 import com.uiuios.aios.BuildConfig;
 import com.uiuios.aios.R;
+import com.uiuios.aios.activity.ControlActivity;
 import com.uiuios.aios.activity.EmergencyActivity;
 import com.uiuios.aios.activity.alarm.AlarmClockActivity;
 import com.uiuios.aios.activity.code.HealthCodeActivity;
@@ -113,9 +114,10 @@ public class CustomFragment extends Fragment implements NetworkUtils.OnNetworkSt
     ConstraintLayout cl_ai;
     @BindView(R.id.cl_appstore)
     ConstraintLayout cl_appstore;
-//    @BindView(R.id.cl_exit)
+    //    @BindView(R.id.cl_exit)
 //    ConstraintLayout cl_exit;
-
+    @BindView(R.id.cl_control)
+    ConstraintLayout cl_control;
 
     //    @BindView(R.id.cl_battery)
 //    ConstraintLayout cl_battery;
@@ -464,6 +466,13 @@ public class CustomFragment extends Fragment implements NetworkUtils.OnNetworkSt
 //                showPassword();
 //            }
 //        });
+        cl_control.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                startActivity(new Intent(mContext, ControlActivity.class));
+            }
+        });
+
         refreshMemory();
     }
 

app/src/main/java/com/uiuios/aios/manager/AmapManager.java

@@ -74,8 +74,13 @@ public class AmapManager {
             String aMapLocationjson = mMMKV.decodeString(AMAPLOCATION_JSON_KEY, "");
             Type type = new TypeToken<BDLocation>() {
             }.getType();
-            BDLocation bdLocation = new Gson().fromJson(aMapLocationjson, type);
-            return bdLocation;
+            try {
+                BDLocation bdLocation = new Gson().fromJson(aMapLocationjson, type);
+                return bdLocation;
+            } catch (Exception e) {
+                Log.e(TAG, "getNowMapLocation: " + e.getMessage());
+                return null;
+            }
         }
         return this.mLocation;
     }
@@ -123,7 +128,7 @@ public class AmapManager {
      * 定位结果回调，重写onReceiveLocation方法，可以直接拷贝如下代码到自己工程中修改
      *
      */
-        private BDAbstractLocationListener mListener = new BDAbstractLocationListener() {
+    private BDAbstractLocationListener mListener = new BDAbstractLocationListener() {
 
         /**
          * 定位请求回调函数

app/src/main/java/com/uiuios/aios/utils/BrightnessUtils.java

@@ -0,0 +1,142 @@
+
+/*
+ * Copyright (C) 2018 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.uiuios.aios.utils;
+
+import android.util.MathUtils;
+
+public class BrightnessUtils {
+
+    public static final int GAMMA_SPACE_MIN = 0;
+    public static final int GAMMA_SPACE_MAX = 65535;
+
+    // Hybrid Log Gamma constant values
+    private static final float R = 0.5f;
+    private static final float A = 0.17883277f;
+    private static final float B = 0.28466892f;
+    private static final float C = 0.55991073f;
+
+    /**
+     * A function for converting from the gamma space that the slider works in to the
+     * linear space that the setting works in.
+     * <p>
+     * The gamma space effectively provides us a way to make linear changes to the slider that
+     * result in linear changes in perception. If we made changes to the slider in the linear space
+     * then we'd see an approximately logarithmic change in perception (c.f. Fechner's Law).
+     * <p>
+     * Internally, this implements the Hybrid Log Gamma electro-optical transfer function, which is
+     * a slight improvement to the typical gamma transfer function for displays whose max
+     * brightness exceeds the 120 nit reference point, but doesn't set a specific reference
+     * brightness like the PQ function does.
+     * <p>
+     * Note that this transfer function is only valid if the display's backlight value is a linear
+     * control. If it's calibrated to be something non-linear, then a different transfer function
+     * should be used.
+     *
+     * @param val The slider value.
+     * @param min The minimum acceptable value for the setting.
+     * @param max The maximum acceptable value for the setting.
+     * @return The corresponding setting value.
+     */
+    public static final int convertGammaToLinear(int val, int min, int max) {
+        final float normalizedVal = MathUtils.norm(GAMMA_SPACE_MIN, GAMMA_SPACE_MAX, val);
+        final float ret;
+        if (normalizedVal <= R) {
+            ret = MathUtils.sq(normalizedVal / R);
+        } else {
+            ret = MathUtils.exp((normalizedVal - C) / A) + B;
+        }
+
+        // HLG is normalized to the range [0, 12], so we need to re-normalize to the range [0, 1]
+        // in order to derive the correct setting value.
+        return Math.round(MathUtils.lerp(min, max, ret / 12));
+    }
+
+    /**
+     * Version of {@link #convertGammaToLinear} that takes and returns float values.
+     * TODO(flc): refactor Android Auto to use float version
+     *
+     * @param val The slider value.
+     * @param min The minimum acceptable value for the setting.
+     * @param max The maximum acceptable value for the setting.
+     * @return The corresponding setting value.
+     */
+    public static final float convertGammaToLinearFloat(int val, float min, float max) {
+        final float normalizedVal = MathUtils.norm(GAMMA_SPACE_MIN, GAMMA_SPACE_MAX, val);
+        final float ret;
+        if (normalizedVal <= R) {
+            ret = MathUtils.sq(normalizedVal / R);
+        } else {
+            ret = MathUtils.exp((normalizedVal - C) / A) + B;
+        }
+
+        // HLG is normalized to the range [0, 12], ensure that value is within that range,
+        // it shouldn't be out of bounds.
+        final float normalizedRet = MathUtils.constrain(ret, 0, 12);
+
+        // Re-normalize to the range [0, 1]
+        // in order to derive the correct setting value.
+        return MathUtils.lerp(min, max, normalizedRet / 12);
+    }
+
+    /**
+     * A function for converting from the linear space that the setting works in to the
+     * gamma space that the slider works in.
+     * <p>
+     * The gamma space effectively provides us a way to make linear changes to the slider that
+     * result in linear changes in perception. If we made changes to the slider in the linear space
+     * then we'd see an approximately logarithmic change in perception (c.f. Fechner's Law).
+     * <p>
+     * Internally, this implements the Hybrid Log Gamma opto-electronic transfer function, which is
+     * a slight improvement to the typical gamma transfer function for displays whose max
+     * brightness exceeds the 120 nit reference point, but doesn't set a specific reference
+     * brightness like the PQ function does.
+     * <p>
+     * Note that this transfer function is only valid if the display's backlight value is a linear
+     * control. If it's calibrated to be something non-linear, then a different transfer function
+     * should be used.
+     *
+     * @param val The brightness setting value.
+     * @param min The minimum acceptable value for the setting.
+     * @param max The maximum acceptable value for the setting.
+     * @return The corresponding slider value
+     */
+    public static final int convertLinearToGamma(int val, int min, int max) {
+        return convertLinearToGammaFloat((float) val, (float) min, (float) max);
+    }
+
+    /**
+     * Version of {@link #convertLinearToGamma} that takes float values.
+     * TODO: brightnessfloat merge with above method(?)
+     *
+     * @param val The brightness setting value.
+     * @param min The minimum acceptable value for the setting.
+     * @param max The maximum acceptable value for the setting.
+     * @return The corresponding slider value
+     */
+    public static final int convertLinearToGammaFloat(float val, float min, float max) {
+        // For some reason, HLG normalizes to the range [0, 12] rather than [0, 1]
+        final float normalizedVal = MathUtils.norm(min, max, val) * 12;
+        final float ret;
+        if (normalizedVal <= 1f) {
+            ret = MathUtils.sqrt(normalizedVal) * R;
+        } else {
+            ret = A * MathUtils.log(normalizedVal - B) + C;
+        }
+
+        return Math.round(MathUtils.lerp(GAMMA_SPACE_MIN, GAMMA_SPACE_MAX, ret));
+    }
+}