Android SDK (Eclipse)：如何为一个简单的应用程序创建一个简单的计时器？
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Android SDK (Eclipse) : How to create a simple timer for a simple App?
提问by Souls Reaper
i have a simple Application about writing the sentence which is shown when the application starts.The only Problem is, i need the application to calculate the time it took the user to write the sentence .. like when you touch "Submit" Button , the Toast message will say " Thats Right ! , It took you 3.2 Second" As Example .
我有一个关于编写应用程序启动时显示的句子的简单应用程序。唯一的问题是，我需要应用程序来计算用户编写句子所花费的时间..就像当你触摸“提交”按钮时， Toast 消息会说“就是这样！，它花了你 3.2 秒”作为示例。
I heard you can set a timer to start on when specific action occurs ... and you can order it to stop .
我听说您可以设置一个计时器以在特定操作发生时开始……您可以命令它停止。
So let's say The Timer will start when you start the app and it will stop when you touch "Submit" button , and give a toast message like above calculating the exact time it took you to write the sentience after starting the App ! *
因此，假设计时器将在您启动应用程序时启动，并在您触摸“提交”按钮时停止，并给出如上所示的吐司消息，计算启动应用程序后您编写感知所需的确切时间！*
Here is the App Code hope it helps : *
这是应用程序代码希望它有帮助：*
Button w;
TextView t;
EditText e;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
w = (Button) findViewById(R.id.Write);
t= (TextView) findViewById(R.id.FTS);
e = (EditText) findViewById(R.id.Text);
w.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String check1 = t.getText().toString();
String check2 = e.getText().toString();
if (check1.equals(check2))
Toast.makeText(MainActivity.this,"You Wrote it Right !!!",Toast.LENGTH_LONG).show();
else if (check2.equals(""))
Toast.makeText(MainActivity.this,"It's Empty",Toast.LENGTH_LONG).show();
else
Toast.makeText(MainActivity.this,"You wrote it wrong,try again !",Toast.LENGTH_LONG);
I'm Totally new to Android so I really don't know how to do it , Thanks for your Time .*
我对 Android 完全陌生，所以我真的不知道该怎么做，谢谢您的时间。*
回答by Coderji
you can use the Timerclass to start a timer session. Follow the steps:
您可以使用Timer该类来启动计时器会话。按照步骤：
1- define a global variable of the Timerand a variable to count the time like:
1-定义一个全局变量Timer和一个变量来计算时间，如：
private Timer t;
private int TimeCounter = 0;
2- then when the activity starts, so in onCreateadd the following: P.S: what I did is I have a textView to show the timing while he is writing the sentence. so if you dont want that you can delete the tvTimerpart in the following code
2-然后当活动开始时，onCreate添加以下内容：PS：我所做的是我有一个 textView 来显示他写句子时的时间。所以如果你不想，你可以删除tvTimer以下代码中的部分
t = new Timer();
t.scheduleAtFixedRate(new TimerTask() {
@Override
public void run() {
// TODO Auto-generated method stub
runOnUiThread(new Runnable() {
public void run() {
tvTimer.setText(String.valueOf(TimeCounter)); // you can set it to a textView to show it to the user to see the time passing while he is writing.
TimeCounter++;
}
});
}
}, 1000, 1000); // 1000 means start from 1 sec, and the second 1000 is do the loop each 1 sec.
then when the button is clicked, stop the timing and show the timeCountervaraible in the Toast.
然后当按钮被点击时，停止计时并timeCounter在Toast.
t.cancel();//stopping the timer when ready to stop.
Toast.makeText(this, "The time taken is "+ String.valueOf(TimeCounter), Toast.LENGTH_LONG).show();
P.S: You have to deal with converting the seconds into minutes because the number could extends to 360 secs so you need to convert it to 6 minutes. you can do it in the t.schedualeAtFixedRateor after you done you can convert it and show it in the toast
PS：您必须处理将秒转换为分钟的问题，因为该数字可能会扩展到 360 秒，因此您需要将其转换为 6 分钟。您可以在完成时t.schedualeAtFixedRate或完成后进行转换，然后将其显示在吐司中
hope you found this useful. please give me a feedback if it worked for you.
希望你觉得这很有用。如果它对你有用，请给我一个反馈。
回答by Jordan Hochstetler
Let me direct your attention to the Chronometer Widget on the Dev Page
让我将您的注意力引向开发页面上的 Chronometer 小部件
Also here's a flavor of what you will get by using the Chronometer Widget (skip to 8:30)
此外，这里还介绍了使用 Chronometer Widget 将获得的体验（跳至 8:30）
XML
XML
<Chronometer
android:id="@+id/chronometer1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
Java
爪哇
((Chronometer) findViewById(R.id.chronometer1)).start();
((Chronometer) findViewById(R.id.chronometer1)).stop();
