Android Notification LED Light Control LED燈 閃爍 控制

通知LED燈控制，測試有些手機可用，有些不可用，需在非充電下執行
1./res/layout/activity_main.xml

2.MainActivity.java

package tw.android;

import android.app.Activity;
import android.app.Notification;
import android.app.NotificationManager;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity {

 private NotificationManager notificationManager;
 private Notification notification;
 private boolean indeterminate = true; // true-開啟, false-關閉
 private int msInterval = 850; // 閃爍間隔時間(毫秒)

 private Button btStart, btStop;

 /** Called when the activity is first created. */
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);

  notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
  notification = new Notification();
  
  /* 啟用通知的led燈 */
  notification.flags = Notification.FLAG_SHOW_LIGHTS;
  /*notification閃亮間隔時間 */
  notification.ledOnMS=100; 
  notification.ledOffMS=100;

  btStart = (Button) findViewById(R.id.btStart);
  btStop = (Button) findViewById(R.id.btStop);

  /* 開始 */
  btStart.setOnClickListener(new OnClickListener() {

   public void onClick(View v) {
    indeterminate = true;// 設為開啟
    new TwoColorBlink().execute(); // 執行LED燈閃爍

    btStart.setEnabled(false); // 開始按鈕-不可按
    btStop.setEnabled(true); // 關閉按鈕-可按

   }
  });

  /* 停止 */
  btStop.setOnClickListener(new OnClickListener() {

   public void onClick(View v) {

    indeterminate = false;// 設為關閉
    notificationManager.cancel(0); // 關閉notificationManager

    btStart.setEnabled(true); // 開始按鈕-可按
    btStop.setEnabled(false); // 關閉按鈕-不可按
   }
  });

 }

 @Override
 protected void onPause() {
  indeterminate = false; // 設為關閉
  notificationManager.cancel(0); // 關閉notificationManager
  super.onPause();
 }

 private class TwoColorBlink extends AsyncTask<Void, Void, Void> {

  private int counter = 0; // 初始化次數

  @Override
  protected void onPreExecute() {

  }

  @Override
  protected Void doInBackground(Void... arg0) {
   try {

    synchronized (this) { //同一時間只有一個Thread執行
     
     notification.ledARGB = 0xFFFF0000;// 設定LED燈開始顏色

     while (indeterminate) { //重複閃爍

      notificationManager.notify(0, notification);//開啟notificationManager

      this.wait(msInterval); //閃爍間隔時間

      notificationManager.cancel(0); //關閉notificationManager

      if (counter++ % 2 == 0) {
       notification.ledARGB = 0xFF00FF00; //切換綠色
      } else {
       notification.ledARGB = 0xFF0000FF; //切換藍色
      }
      
     }

    }
   } catch (InterruptedException e) {
    e.printStackTrace();
   }
   return null;
  }

  @Override
  protected void onPostExecute(Void result) {
   

  }

 }

}

檔按下載:https://github.com/terryyamg/LedTest
參考來源:http://www.41post.com/4706/programming/android-creating-a-two-color-led-notification