本文轉載自：https://blog.csdn.net/danwuxie/article/details/82193880

一、通知燈應用程式的編寫

1、首先實現一個按鈕功能

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context=".MainActivity"
    android:orientation="vertical">
 
 
 
    <Button
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Flashing Light at 20S"
        android:id="@+id/button"
        />
 
</LinearLayout>


2、實現按鈕的點選監聽

mLightButton = (Button)findViewById(R.id.button);
        mLightButton.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                // Perform action on click
                flashing = !flashing;
                if (flashing){
                    mLightButton.setText("Stop Flashing the Light");
                }else {
                    mLightButton.setText("Flashing Light at 20S");
                }
                mLightHander.postDelayed(mLightRunnable, 20000);
            }
        });
3、實現延時

   private Handler mLightHander = new Handler();
    private LightRunnable mLightRunnable = new LightRunnable();
 
    class LightRunnable implements Runnable {
        @Override
        public void run() {
            if (flashing) {
                FlashingLight();
            } else {
                ClearLED();
            }
        }
    }
 
   mLightHander.postDelayed(mLightRunnable, 20000);
4、實現通知

    private void FlashingLight()
    {
        NotificationManager nm = ( NotificationManager ) getSystemService( NOTIFICATION_SERVICE );
        Notification notif = new Notification();
        notif.flags = Notification.FLAG_SHOW_LIGHTS;
        notif.ledARGB = 0xFF0000ff;
        notif.ledOnMS = 100;
        notif.ledOffMS = 100;
        nm.notify(LED_NOTIFICATION_ID, notif);
    }
5、取消通知

  private void ClearLED()
    {
        NotificationManager nm = ( NotificationManager ) getSystemService( NOTIFICATION_SERVICE );
        nm.cancel(LED_NOTIFICATION_ID);
    }
6、實現點選延時

        mLightButton.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                // Perform action on click
                flashing = !flashing;
                if (flashing){
                    mLightButton.setText("Stop Flashing the Light");
                }else {
                    mLightButton.setText("Flashing Light at 20S");
                }
                mLightHander.postDelayed(mLightRunnable, 20000);
            }
        });
二、測試

用法:
1. 先在單板上"Setting"->"Display"->"Sleep"設為"15S"
2. 執行程式
3. 點選按鈕後不再操作
4. 等螢幕再次變黑即可看到通知燈閃爍
 
注意：黑屏期間可以通過menu鍵或K1鍵返回程式介面
三、程式

package com.thisway.app_0002_lightdemo;
 
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
import android.app.NotificationManager;
import android.app.Notification;
import android.view.View;
 
public class MainActivity extends AppCompatActivity {
 
    private Button mLightButton = null;
    boolean flashing = false;
    final private int LED_NOTIFICATION_ID = 123;
 
    private Handler mLightHander = new Handler();
    private LightRunnable mLightRunnable = new LightRunnable();
 
    class LightRunnable implements Runnable {
        @Override
        public void run() {
            if (flashing) {
                FlashingLight();
            } else {
                ClearLED();
            }
        }
    }
 
    private void FlashingLight()
    {
        NotificationManager nm = ( NotificationManager ) getSystemService( NOTIFICATION_SERVICE );
        Notification notif = new Notification();
        notif.flags = Notification.FLAG_SHOW_LIGHTS;
        notif.ledARGB = 0xFF0000ff;
        notif.ledOnMS = 100;
        notif.ledOffMS = 100;
        nm.notify(LED_NOTIFICATION_ID, notif);
    }
 
    private void ClearLED()
    {
        NotificationManager nm = ( NotificationManager ) getSystemService( NOTIFICATION_SERVICE );
        nm.cancel(LED_NOTIFICATION_ID);
    }
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        mLightButton = (Button)findViewById(R.id.button);
        mLightButton.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                // Perform action on click
                flashing = !flashing;
                if (flashing){
                    mLightButton.setText("Stop Flashing the Light");
                }else {
                    mLightButton.setText("Flashing Light at 20S");
                }
                mLightHander.postDelayed(mLightRunnable, 20000);
            }
        });
 
    }
 
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }
 
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
 
        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }
 
        return super.onOptionsItemSelected(item);
    }
}
 
 
 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">
 
    <Button
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Flashing Light at 20S"
        android:id="@+id/button" />
 
 
</LinearLayout>