Question

我正在编写一个小型的CountDown程序，我发现其中一个SO链接对我有帮助以获取代码，但我有一个小查询如何在我们提到的倒计时到达时显示消息。

public class MainActivity extends Activity {

String time1 = "14-02-2015 12:01:00";
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    tv=(TextView)findViewById(R.id.textView1);
    final Handler handler = new Handler();
    handler.postDelayed(new Runnable() {

        @Override
        public void run() {
            Calendar start = Calendar.getInstance();  
            String time = "dd-MM-yyyy hh:mm:ss";

            String dateStart =(String) DateFormat.format(time, start);                          
            String dateStop = time1;


             SimpleDateFormat format = new SimpleDateFormat("dd-MM-yyyy HH:mm:ss");  
            // Custom date format
            java.util.Date d1=null;
            java.util.Date d2=null;
              try {
                    d1 = format.parse(dateStart);
                    d2 = format.parse(dateStop);
                } catch (java.text.ParseException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }


            long diff = d2.getTime() - d1.getTime();

            long diffdays    =(diff/ (1000*60*60*24));
            long diffHours = ((diff - (1000*60*60*24*diffdays)) / (1000*60*60));                             
            long diffMinutes = (diff - (1000*60*60*24*diffdays) - (1000*60*60*diffHours)) / (1000*60);  
            long diffSeconds =(diff - (1000*60*60*24*diffdays) - (1000*60*60*diffHours) -(1000*60*diffMinutes))/ (1000);                

            String out= 
                    "Days: "+diffdays+
                    " Hours: "+diffHours+
                    " Minutes: "+diffMinutes+
                    " seconds: "+diffSeconds;
            tv.setText(out);

            handler.postDelayed(this, 1000);
        }
    }, 1000); 
  }
}

我想要留言＆＃34;情人节快乐＆＃34;到达日期时在同一TextView中

Answer 1

在一起运行倒数计时器不是一个好习惯

如果要设置特定日期，您可能需要在该特定日期添加一些带有自定义消息的警报事件。此外，你必须编写一个广播接收器来处理该警报，以打开一些活动并在那里处理。

Answer 2

1.Pude你会杀了你的android设备。请不要长时间运行一个帖子。使用报警管理器和广播接收器..

要显示消息，您需要调用对话框或Toast。但你不能这样做，因为你正在使用一个线程。因此，您需要调用runOnUiThread并在其中写入警报对话框代码。

==============

runOnUiThread(new Runnable() {
            @Override
            public void run() {
            // Your dialog code.
            }
        });

根据您的申请，您应该这样做。

runOnUiThread(new Runnable() {
        @Override
        public void run() {
        // Your dialog code.
        tv.setText(out);
        }
    });

Answer 3

你在android中有倒计时：

示例：

CountDownTimer cdt = new CountDownTimer( a.getTime() - b.getTime(), 1000)
            {

                public void onTick(long millisUntilFinished)
                {
                    // TODO Auto-generated method stub
                    long seconds = millisUntilFinished / 1000;
                    long minutes = seconds / 60;
                    long hours = minutes / 60;
                    long days = hours / 24;

                    txtDays.setText( days + "" );
                    txtHours.setText( hours % 24 + "h" );
                    txtMinutes.setText( minutes % 60 + "m" );
                    txtSeconds.setText( seconds % 60 + "s");
                }

                public void onFinish()
                {
                    // TODO Auto-generated method stub
                    txtDateTime.setVisibility(View.VISIBLE);
                    txtDays.setVisibility(View.GONE);
                    txtHours.setVisibility(View.GONE);
                    txtSeconds.setVisibility(View.GONE);
                    txtMinutes.setVisibility(View.GONE);
                    txtDayText.setVisibility(View.GONE);
                }
            }.start();

到达日期时如何显示消息

3 个答案: