Android O 下拉框增加自动亮度开关选项

本操作是更改Android O 系统源码 MTK平台
首先来看看要实现的效果：
Android O 下拉框增加自动亮度开关选项_第1张图片
Android O 下拉框增加自动亮度开关选项_第2张图片

接下来看看具体实现步骤：
1 仿照
vendor/mediatek/proprietary/packages/apps/SystemUI/src/com/android/systemui/qs/tiles/ 目录下的java文件，自己新建个AutoBrightnessTile.java，放入其中:

package com.android.systemui.qs.tiles;import android.util.Log;import com.android.systemui.R;import com.android.systemui.plugins.qs.QSTile.BooleanState;import com.android.systemui.qs.QSHost;import com.android.systemui.qs.tileimpl.QSTileImpl;import android.content.Intent;import android.provider.Settings;import android.service.quicksettings.Tile;import android.widget.Switch;import com.android.internal.logging.nano.MetricsProto.MetricsEvent;import com.android.systemui.settings.BrightnessController;import android.os.SystemProperties;import static android.provider.Settings.System.SCREEN_BRIGHTNESS_MODE;import static android.provider.Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC;import static android.provider.Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL;public class AutoBrightnessTile extends QSTileImpl<BooleanState> {    private final Icon mIcon = ResourceIcon.get(R.drawable.ic_qs_brightness_auto_on);    private boolean isAuto;    public AutoBrightnessTile(QSHost host){               super(host);        }    @Override    public BooleanState newTileState() {        return new BooleanState();    }    @Override    protected void handleClick() {        isAuto = !mState.value;        Settings.System.putInt(mContext.getContentResolver(),             SCREEN_BRIGHTNESS_MODE,(isAuto ? 1 : 0) );//把设置的值写入        refreshState(isAuto);//更新    }    @Override    protected void handleUpdateState(BooleanState state, Object arg) {        if (state.slash == null) {            state.slash = new SlashState();        }        isAuto = Settings.System.getInt(mContext.getContentResolver(),            SCREEN_BRIGHTNESS_MODE, 0) == 1;//获取状态值        state.label = mContext.getString(R.string.quick_settings_auto_brightness);        state.icon = mIcon;//定义图标                      state.value = isAuto;        state.slash.isSlashed = !state.value;                     state.state = state.value ? Tile.STATE_ACTIVE : Tile.STATE_INACTIVE;          }//设置状态切换    @Override    protected void handleUserSwitch(int newUserId) {    }    @Override    public Intent getLongClickIntent() {        return new Intent(Settings.ACTION_DISPLAY_SETTINGS);//长按监听    }    @Override    public void handleSetListening(boolean listening) {    }    @Override    public boolean isAvailable() {               return true;//可见    }    @Override    public CharSequence getTileLabel() {        return mContext.getString(R.string.quick_settings_auto_brightness);    }//定义标题    @Override    public int getMetricsCategory() {        return MetricsEvent.ACTION_BRIGHTNESS_AUTO;    }}

2 定义自动亮度标题字符串和图标

vendor/mediatek/proprietary/packages/apps/SystemUI/res/values/strings.xml

<string name="quick_settings_auto_brightness">Auto Brightnessstring>

图片ic_qs_brightness_auto_on在系统代码里就有了，不需要重新添加。

3 在 vendor/mediatek/proprietary/packages/apps/SystemUI/res/values/config.xml 中加入autobrightness相关属性

<string name="quick_settings_tiles_default" translatable="false">        wifi,bt,dnd,flashlight,rotation,battery,cell,airplane,cast,autobrightnessstring><string name="quick_settings_tiles_stock" translatable="false">                       wifi,cell,battery,dnd,flashlight,rotation,bt,airplane,location,hotspot,inversion,saver,work,cast,night,autobrightnessstring>

4 扫描是否有相关属性，有的话new这个AutoBrightnessTile类
vendor/mediatek/proprietary/packages/apps/SystemUI/src/com/android/systemui/qs/tileimpl/QSFactoryImpl.java

import com.android.systemui.qs.tiles.AutoBrightnessTile;else if (tileSpec.equals("nfc")) return new NfcTile(mHost);else if (tileSpec.equals("autobrightness")) return new AutoBrightnessTile(mHost);//joy

5 当点击下拉框选项开关，Settings 相应设置也要改变，这里有两种方法，一种是广播监听。另一种是监听数据库变化，首先来看看第一种
vendor/mediatek/proprietary/packages/apps/MtkSettings/src/com/android/settings/display/AutoBrightnessPreferenceController.java (注册并监听广播)

import android.content.BroadcastReceiver;//joyimport android.content.Intent;//joyimport android.content.IntentFilter;//joypublic class AutoBrightnessPreferenceController extends AbstractPreferenceController implements        PreferenceControllerMixin, Preference.OnPreferenceChangeListener {    private final static String Auto_Brightness_MODE = "mid.settings.autoBrightness";//joy    private SwitchPreference mPreference;//joy    public AutoBrightnessPreferenceController(Context context, String key) {        super(context);        mAutoBrightnessKey = key;        IntentFilter autoBrightnessFilter = new IntentFilter();//joy        autoBrightnessFilter.addAction(Auto_Brightness_MODE);//joy        context.registerReceiver(mAutoBrightnessBroadcastReceiver, autoBrightnessFilter);//joy    }    //joy add start    private void updateAutoState(){        int brightnessMode = Settings.System.getInt(mContext.getContentResolver(),                SYSTEM_KEY, DEFAULT_VALUE);        mPreference.setChecked(brightnessMode != DEFAULT_VALUE);    }    //add end    public void updateState(Preference preference) {        mPreference = (SwitchPreference) preference;//joy        updateAutoState();//joy    }}

vendor/mediatek/proprietary/packages/apps/SystemUI/src/com/android/systemui/qs/tiles/AutoBrightnessTile.java (发送广播)

public class AutoBrightnessTile extends QSTileImpl<BooleanState> {    private final static String Auto_Brightness_MODE = "mid.settings.autoBrightness";//joy    protected void handleClick() {        isAuto = !mState.value;        Settings.System.putInt(mContext.getContentResolver(), SCREEN_BRIGHTNESS_MODE,(isAuto ? 1 : 0) );        Intent intent = new Intent(Auto_Brightness_MODE);//joy        mContext.sendBroadcast(intent);//joy        refreshState(isAuto);    }}

第二种在Settings监听数据库，相应数据有变化即时更新
vendor/mediatek/proprietary/packages/apps/MtkSettings/src/com/android/settings/display/AutoBrightnessPreferenceController.java

import android.database.ContentObserver;//joyimport android.os.Handler;//joypublic class AutoBrightnessPreferenceController extends AbstractPreferenceController implements        PreferenceControllerMixin, Preference.OnPreferenceChangeListener {    private SettingsValueChangeContentObserver mContentOb;//joy    private SwitchPreference mPreference;//joy    public AutoBrightnessPreferenceController(Context context, String key) {        super(context);        mAutoBrightnessKey = key;        //joy add start        if(mContentOb==null){            mContentOb = new SettingsValueChangeContentObserver();            mContext.getContentResolver().registerContentObserver(Settings.System                .getUriFor(SCREEN_BRIGHTNESS_MODE),true, mContentOb);        }        //add end    }//joy add start    class SettingsValueChangeContentObserver extends ContentObserver {        public SettingsValueChangeContentObserver() {            super( new Handler());        }        @Override        public void onChange(boolean selfChange) {            super.onChange(selfChange);            updateAutoState();        }    }    private void updateAutoState(){        int brightnessMode = Settings.System.getInt(mContext.getContentResolver(),                SYSTEM_KEY, DEFAULT_VALUE);        mPreference.setChecked(brightnessMode != DEFAULT_VALUE);    }    //add end    @Override    public void updateState(Preference preference) {        mPreference = (SwitchPreference) preference;//joy        updateAutoState();//joy    }

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