Android Light开发（一）

Light源码

public abstract class Light {
    public static final int LIGHT_FLASH_NONE = 0;
    public static final int LIGHT_FLASH_TIMED = 1;
    public static final int LIGHT_FLASH_HARDWARE = 2;

    /**
     * Light brightness is managed by a user setting.
     */
    public static final int BRIGHTNESS_MODE_USER = 0;

    /**
     * Light brightness is managed by a light sensor.
     */
    public static final int BRIGHTNESS_MODE_SENSOR = 1;

    public abstract void setBrightness(int brightness);
    public abstract void setBrightness(int brightness, int brightnessMode);
    public abstract void setColor(int color);
    public abstract void setFlashing(int color, int mode, int onMS, int offMS);
    public abstract void pulse();
    public abstract void pulse(int color, int onMS);
    public abstract void turnOff();
}

public abstract class LightsManager {
    public static final int LIGHT_ID_BACKLIGHT = 0;//背光灯
    public static final int LIGHT_ID_KEYBOARD = 1;//键盘灯
    public static final int LIGHT_ID_BUTTONS = 2;//Home Menu,Back键灯
    public static final int LIGHT_ID_BATTERY = 3;  //充电灯
    public static final int LIGHT_ID_NOTIFICATIONS = 4;//通知灯
    public static final int LIGHT_ID_ATTENTION = 5;   //重要灯
    public static final int LIGHT_ID_BLUETOOTH = 6;//蓝牙
    public static final int LIGHT_ID_WIFI = 7;//WIFI灯
    public static final int LIGHT_ID_COUNT = 8;

    public abstract Light getLight(int id);
}

系统开发点亮灯已充电灯为例

    
    #ffffffff

    
    500

    
    2000

    
    0xFFFF0000

    
    0xFFFFFF00

    
    0xFF00FF00

    
    125

    
    false

    
    2875

    private final class Led {
        private final Light mBatteryLight;

        private final int mBatteryLowARGB;
        private final int mBatteryMediumARGB;
        private final int mBatteryFullARGB;
        private final int mBatteryLedOn;
        private final int mBatteryLedOff;

        public Led(Context context, LightsManager lights) {
            mBatteryLight = lights.getLight(LightsManager.LIGHT_ID_BATTERY);

            mBatteryLowARGB = context.getResources().getInteger(
                    com.android.internal.R.integer.config_notificationsBatteryLowARGB);//0xFFFF0000
            mBatteryMediumARGB = context.getResources().getInteger(
                    com.android.internal.R.integer.config_notificationsBatteryMediumARGB);//
            mBatteryFullARGB = context.getResources().getInteger(
                    com.android.internal.R.integer.config_notificationsBatteryFullARGB);
            mBatteryLedOn = context.getResources().getInteger(
                    com.android.internal.R.integer.config_notificationsBatteryLedOn);
            mBatteryLedOff = context.getResources().getInteger(
                    com.android.internal.R.integer.config_notificationsBatteryLedOff);
        }
        mBatteryLight.setFlashing(mBatteryLowARGB, Light.LIGHT_FLASH_TIMED,
                            mBatteryLedOn, mBatteryLedOff);//红灯闪
     mBatteryLight.setColor(mBatteryFullARGB);//绿灯亮
  mBatteryLight.turnOff();//充电灯关闭

第三方应用点亮灯

//如果硬件支持通知灯	 

		findViewById(R.id.red_open).setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				turnOnLED(Color.RED);
			}
		});
		

		
		findViewById(R.id.green_open).setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				turnOnLED(Color.GREEN);
			}
		});
		

		
		findViewById(R.id.blue_open).setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				turnOnLED(Color.BLUE);
			}
		});
		
		findViewById(R.id.blue_close).setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				turnOnLED(Color.YELLOW);
			}
		});
		
		findViewById(R.id.green_close).setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				turnOffLED();
			}
		});
				
	}
	
	

	 private void turnOnLED(int color){  
		System.out.println("wangruiCIT_LEDTEST START!!!");
	
		int ID_LED = 19871103; 		
		NotificationManager nm = (NotificationManager)getSystemService(NOTIFICATION_SERVICE); 
		Notification notification = new Notification();
		notification.ledARGB = color;  
		
		//notification.defaults |= Notification.DEFAULT_LIGHTS; 

	
	

   
			notification.ledOnMS = 1; 
			notification.ledOffMS =0; 	
			
//			notification.ledOnMS = 125; 
//			notification.ledOffMS =2875; 
		
		notification.flags = Notification.FLAG_SHOW_LIGHTS; 
		nm.notify(ID_LED, notification); 

				
	}
	 
	 private void turnOffLED(){  
		System.out.println("wangruiCIT_LEDTEST START!!!");
	
		int ID_LED = 19871103; 		
		NotificationManager nm = (NotificationManager)getSystemService(NOTIFICATION_SERVICE); 
		Notification notification = new Notification();

		notification.ledARGB = Color.BLACK;  
		
		//notification.defaults |= Notification.DEFAULT_LIGHTS; 

	


   
			notification.ledOnMS = 0; 
			notification.ledOffMS = 0; 	
		
		notification.flags = Notification.FLAG_SHOW_LIGHTS; 
		nm.notify(ID_LED, notification); 
		
	}

	
}

或者直接这样，前提是三方应用必须打入系统应用，并且在应用程序的AndroidManifest.xml中的manifest节点中加入android:sharedUserId="android.uid.system"这个属性。

通过系统一起编译

	static String RED_LED_DEV = "/sys/class/leds/red/brightness";
    static String GREEN_LED_DEV = "/sys/class/leds/green/brightness";
    static String BLUE_LED_DEV = "/sys/class/leds/blue/brightness";

    static void setLedStatus (String ledDev, boolean setStatusOn) {
       try {
           FileOutputStream fLed = new FileOutputStream(ledDev);
           fLed.write((setStatusOn ? "255" : "0").getBytes());
           fLed.close();
       } catch (Exception e) {
           e.printStackTrace(); 
       }
    }