Android多线程操作，as快捷键笔记

Android studio 快捷键

 cmd+p 快速查看该方法的参数定义
*
* option + shift +上下 快速移动上下行
*
* cmd + e 显示最近操作的文件
*
* cmd + option +左右 回到之前浏览过的地方
* option + shift +点击 多光标操作
* control +g 多重选择
* f3  添加书签
* cmd +f3 查看书签
*
* cmd + y 在当前页面预览代码
* cmd + option + t 对某行代码进行重构，例如增加if 语句
*
* option + enter 快速提示

 

• 多线程操作不要显式调用Thread，使用AsyncTask或者ThreadPoolExecutor

        //执行task
  //        new DownLoadTask().execute();
    
      class DownLoadTask extends AsyncTask<Void,Integer,Boolean>{
  
          @Override
          protected void onPreExecute() {
              super.onPreExecute();
          }
  
          @Override
          protected Boolean doInBackground(Void... voids) {
              //后台处理返回处理结果
              //更新处理进度
              publishProgress(11);
              return null;
          }
  
          @Override
          protected void onProgressUpdate(Integer... values) {
             //进度处理
          }
  
          @Override
          protected void onPostExecute(Boolean aBoolean) {
              //结果处理
          }
      }
  

  private void userThreadPoolExecutor(){
          int NUMBER_CORES = Runtime.getRuntime().availableProcessors();
          int keep_alive = 8;
  
          BlockingQueue que = new LinkedBlockingDeque();//队列，这里面的任务可以放入int的max个
  
          ArrayBlockingQueue arrque = new ArrayBlockingQueue(2);//只放入两个任务
  //
          ThreadPoolExecutor executor = new ThreadPoolExecutor(2,5,keep_alive,
                  TimeUnit.SECONDS,arrque,new NameTreadFactory(),new MyIgnorePolicy());
  
          for (int i = 0;i < 10;i++){
              executor.execute(new MyRunable(""+i));
          }
  
  
      }
      static class NameTreadFactory implements ThreadFactory {
  
          private final AtomicInteger mThreadNum = new AtomicInteger(1);
  
          @Override
          public Thread newThread(Runnable r) {
              Thread t = new Thread(r, "my-thread-" + mThreadNum.getAndIncrement());
              System.out.println(t.getName() + " has been created");
              return t;
          }
      }
      public static class MyIgnorePolicy implements RejectedExecutionHandler {
  
          public void rejectedExecution(Runnable r, ThreadPoolExecutor e) {
              doLog(r, e);
          }
  
          private void doLog(Runnable r, ThreadPoolExecutor e) {
              // 可做日志记录等
              Log.d("tag",r.toString() + " rejected");
  //          System.out.println("completedTaskCount: " + e.getCompletedTaskCount());
          }
      }
      class  MyRunable implements Runnable {
          private String name;
  
          public MyRunable(String name){
                  this.name = name;
          }
  
          @Override
          public void run() {
              try {
                  System.out.println(this.toString() + " is running!");
                  Thread.sleep(3000); //让任务执行慢点
              } catch (Exception e) {
                  e.printStackTrace();
              }
          }
  
          public String getName() {
              return name;
          }
  
          @Override
          public String toString() {
              return "My task---[name==="+name+" ]";
          }
      }