1.frameworks/base/core/java/android/provider/Settings.java中添加

/**

*Control whether to enable led indicator mod.

*@hide

*/

public static final String LED_INDICATOR_MODE=”led_indicator_mode”;

/**

*LED_INDICATOR_MODE value for off mode.

*@hide

*/

public static final int LED_INDICATOR_MODE=0;

/**

*LED_INDICATOR_MODE value for on mode.

*@hide

*/

public static final int LED_INDICATOR_MODE=1;

2.frameworks/base/packages/SettingsProvider/res/values/defaults.xml中添加

1

3.frameworks/base/packages/SettingsProvider/src/com/android/providers/settings/DatabaseHelper.java中添加使led指示的键和键值存入数据库的操作

loadintegerSettings(stmt,Settings.System.LED_INDICATOR_MODE,

R.integer.def_led_indicator_mode);

4.packages/apps/Settings/res/values/string.xml中添加

Led indicator

5.packages/apps/Settings/res/xml/display_settings.xml中添加

6.在packages/apps/Settings/src/com/android/settings/display/中添加一个新文件LedIndicatorPreferenceController.java

package com.android.settings.display;

import android.content.Context;

import android.provider.Settings;

import android.support.v7.preference.Preference;

import android.support..v14.preference.SwitchPreference;

import com.android.settings.core.PreferenceController;

import static android.provider.Settings.System.LED_INDICATOR_MODE;

import static android.provider.Settings.System.LED_INDICAATOR_MODE_OFF;

import static android.provider.Settings.System.LED_INDICAATOR_MODE_ON;

/**

* Created by songyan on 2017/12/28.

*/

public class LedIndecatorPreferenceController extends PreferenceController implements

Preference.OnPreferenceChangeListener{

private static final String KEY_LED_INDICATOR="led_indicator";

public LedIndecatorPreferenceController(Context context){

super(context);

}

@Override

public String getPreferenceKey(){

return KEY_LED_INDICATOR;

}

@Override

public void updateState(Preference preference){

int ledMode=Settings.System.getInt(mContext.getContentResolver(),

LED_INDICATOR_MODE,LED_INDICATOR_MODE_ON);

((SwitchPreference)preference).setChecked(ledMode==LED_INDICATOR_MODE_ON);

}

@Override

public boolean isAvailable(){

return true;

}

@Override

public boolean onPreferenceChange(Preference preference,Object newValue){

boolean isOn=(Boolean)newValue;

Settings.System.putInt(mContext.getContentResolver(),LED_INDICATOR_MODE,

isOn ? LED_INDICATOR_MODE_ON : LED_INDICATOR_MODE_OFF);

return true;

}

}

7.packages/apps/Settings/src/com/android/settings/DisplaySettings.java中添加

import com.android.settings.display.LedIndicatorPreferenceController;

private static final String KEY_LED_INDICATOR=”led_indicator”;

在buildPreferenceController方法中添加

controllers.add(new LedIndicatorPreferenceController(context));

8.frameworks/base/services/core/java/com/android/server/notification/NotificationManagerService.java中添加

import static android.provider.Settings.System.LED_INDICATOR_MODE;

import static android.provider.Settings.System.LED_INDICATOR_MODE_OFF;

import static android.provider.Settings.System.LED_INDICATOR_MODE_ON

在updateLightsLocked()方法中添加

int ledMode=Settings.System.getInt(getContext().getContentResolver(),

LED_INDICATOR_MODE,LED_INDICATOR_MODE_ON);

if(ledNotification==null || mInCall || mScreenOn || ledMode==LED_INDICATOR_MODE_OFF){