Question

我正在尝试在java应用程序（android）中做一些事情，我需要一些东西来延迟/等待循环的秒数。我怎么能延迟android功能？我曾尝试使用Thread.sleep（），TimeUnit.sleep，但它只会做几秒钟不负责任的程序。我想做一些onClick actionlistener，它会更新几秒钟。例如：如果我点击按钮 - ＆gt;文本更改为随机（int），它应该每秒完成。

随机......等待一秒......随机......等待一秒钟 ......随机......以及很多次

for (int i = 0; i < 10; i++) {
    int random = r.nextInt(100) - 10;
    String rand = Integer.toString(random);
    textView3.setText(rand);
    TimeUnit.SECONDS.sleep(1);
}

Answer 1

将postDelayed与final Handler handler = new Handler(); handler.postDelayed(new Runnable() { @Override public void run() { Log.d("Log:", "Hello!"); handler.postDelayed(this, 1000); } }, 1000);一起使用，例如：

<?php
// 1. Autoload the SDK Package. This will include all the files and classes to your autoloader
require __DIR__  . '/PayPal-PHP-SDK/autoload.php';
// 2. Provide your Secret Key. Replace the given one with your app clientId, and Secret
// https://developer.paypal.com/webapps/developer/applications/myapps
$apiContext = new \PayPal\Rest\ApiContext(
    new \PayPal\Auth\OAuthTokenCredential(
        'AYSq3RDGsmBLJE-otTkBtM-jBRd1TCQwFf9RGfwddNXWz0uFU9ztymylOhRS',     // ClientID
        'EGnHDxD_qRPdaLdZz8iCr8N7_MzF-YHPTkjs6NKYQvQSBngp4PTTVWkPZRbL'      // ClientSecret


    )
);
// 3. Lets try to save a credit card to Vault using Vault API mentioned here
// https://developer.paypal.com/webapps/developer/docs/api/#store-a-credit-card
$creditCard = new \PayPal\Api\CreditCard();
$creditCard->setType("visa")
    ->setNumber("4417119669820331")
    ->setExpireMonth("11")
    ->setExpireYear("2019")
    ->setCvv2("012")
    ->setFirstName("Joe")
    ->setLastName("Shopper");
// 4. Make a Create Call and Print the Card
try {
    $creditCard->create($apiContext);
   echo $creditCard;
    $mycard=json_decode($creditCard, true);

//echo json_encode($mycard["id"]);
$response["success"] = "1";
        $response["message"] = "update success";
$response["cardid"] = $mycard["id"] ;
echo '{"worldpopulation":'.json_encode($response).'}';
}
catch (\PayPal\Exception\PayPalConnectionException $ex) {
    // This will print the detailed information on the exception. 
    //REALLY HELPFUL FOR DEBUGGING
$response["success"] = "0";
        $response["message"] = "not update success";

echo '{"worldpopulation":'.json_encode($response).'}';
    //echo $ex->getData();
}

?>

Answer 2

您可以使用处理程序：

for (int i = 0; i < 10; i++) {
    Handler handler = new Handler();
    Runnable r = new Runnable() {
        public void run() {
        int random = r.nextInt(100) - 10;
        String rand = Integer.toString(random);
        textView3.setText(rand);            
        }
    };
    handler.postDelayed(r, 1000);
}

看看这个问题：How to run a Runnable thread in Android?

Answer 3

我对android app编程不是很熟悉

但是如果你想每一秒打印一个随机数到文本...那么使用Timer而不是Delay呢？

我不知道Android中的代码是如何工作的，但逻辑应该是这样的：

按下按钮：

Timer.Start(1000)

对于每个计时器刻度：

int numberVariable = random(1,10)
textVariable = numberVariable.toString()

Answer 4

添加一个带有计时器的处理程序，如下所示：

public Handler handler = new Handler();
handler.postDelayed(new Runnable() {
    @Override
    public void run() {
        // Do something after 5s = 5000ms
    }
}, 5000);

Answer 5

您可以使用Handler类将循环延迟所需的任何时间。它是这样的。

Handler handler = new Handler();
    handler.postDelayed(new Runnable() {
        @Override
        public void run() {
            //Your function goes here.
        }
    }, 5000); /your time in micro seconds.

希望有所帮助。

Answer 6

实际上有很多方法可以做到这一点。

来自： https://stackoverflow.com/a/3072338/2801237

这样做的好处是你不需要处理一个处理程序，你可以很容易地随机化'5'秒输入（加上它显然是5秒），而不是5000毫秒。（更多下面）

private static final ScheduledExecutorService worker = 
          Executors.newSingleThreadScheduledExecutor();

void someMethod() {
  ⋮
  Runnable task = new Runnable() {
    public void run() {
      /* Do something… */
    }
  };
  worker.schedule(task, 5, TimeUnit.SECONDS);
  ⋮
}

这种方法的另一大好处是你可以快速/轻松地扩展它以使用线程池。

  private static final ScheduledExecutorService worker =
         Executors.newScheduledThreadPool(4); //thread pool of 4 threads.

Answer 7

试试这个

public void randomStart() {
    Handler handler = new Handler();
    Runnable runnable = new Runnable() {
        @Override
        public void run() {
            handler.postDelayed(this, 1000*1);
            try {
                Random r = new Random();
                int random = r.nextInt(100) - 10;
                String rand = Integer.toString(random);
                textView3.setText(rand);
            }
            catch(Exception e) {
            e.printStackTrace();
            }
        }
    };
    handler.postDelayed(runnable,1*1000);
}

我怎样才能延迟onClick动作

7 个答案: