android - 如何在android中显示计时器

Question

我想在 TextView 中以类似 [19:59] 的格式显示计时器。所以当我单击开始按钮时，计时器将显示为例如，我想设置最多 20 分钟，它将显示为 [19 :58][19:87]。任何人都可以给出一些想法或示例代码吗？

Answer 1

您可以使用CountDownTimer.

http://developer.android.com/reference/android/os/CountDownTimer.html

     TextView _tv = (TextView) findViewById( R.id.textView1 );
    new CountDownTimer(20*60000, 1000) {

        public void onTick(long millisUntilFinished) {
            _tv.setText("seconds remaining: " +new SimpleDateFormat("mm:ss:SS").format(new Date( millisUntilFinished)));
        }

        public void onFinish() {
           _tv.setText("done!");
        }
     }.start();

要取消，只需在计时器上调用取消。

public final void cancel()

取消倒计时。

Answer 2

package com.example.testproject;

import java.util.Timer;
import java.util.TimerTask;

import android.os.Bundle;
import android.widget.TextView;
import android.app.Activity;

public class MainActivity extends Activity {

    public int seconds = 60;
    public int minutes = 10;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //Declare the timer
        Timer t = new Timer();
        //Set the schedule function and rate
        t.scheduleAtFixedRate(new TimerTask() {

            @Override
            public void run() {
                runOnUiThread(new Runnable() {

                    @Override
                    public void run() {
                        TextView tv = (TextView) findViewById(R.id.main_timer_text);
                        tv.setText(String.valueOf(minutes)+":"+String.valueOf(seconds));
                        seconds -= 1;

                        if(seconds == 0)
                        {
                            tv.setText(String.valueOf(minutes)+":"+String.valueOf(seconds));

                            seconds=60;
                            minutes=minutes-1;

                        }



                    }

                });
            }

        }, 0, 1000);
    }

}

Answer 3

  //start button click
     CountDown timer = new CountDown(180000, 1000);
     timer.start();

//stop button click
timer.stop();   

    //countdown class
    public class CountDown extends CountDownTimer {

          public CountDown(long millisInFuture, long countDownInterval) {
             super(millisInFuture, countDownInterval);
          }

          @Override
          public void onTick(long millisUntilFinished) {
             long ms = millisUntilFinished;
             String text = String.format("%02d\' %02d\"",
                                         TimeUnit.MILLISECONDS.toMinutes(ms) - TimeUnit.HOURS.toMinutes(TimeUnit.MILLISECONDS.toHours(ms)),
                                         TimeUnit.MILLISECONDS.toSeconds(ms) - TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(ms)));
             textViewTimer.setText(text);
          }

          @Override
          public void onFinish() {
             textViewTimer.setText("ffinish");
          }
       }

Answer 4

这样做activity_timer.xml

<android.support.v7.widget.LinearLayoutCompat
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent">


        <Chronometer
            android:id="@+id/chronometer2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />


    </android.support.v7.widget.LinearLayoutCompat>

在活动中

public class TimerActivity extends AppCompatActivity {
   private Chronometer chronometer2;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_timer);

        chronometer2 = findViewById(R.id.chronometer2);
        chronometer2.start();
    }
}

您也可以使用停止

chronometer2.stop();

重新开始

chronometer2.setBase(SystemClock.elapsedRealtime());
 chronometer2.start();

Answer 5

在这里，我使用 Timer 类来显示计时器

    public class FourthActivity extends AppCompatActivity {
    Button startButton, pauseButton;
    TextView timerValue;
    Timer timer;
    int seconds = 0, minutes = 0, hour = 0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_fourth);
        bindView();

        timer = new Timer();
        startButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                timer.scheduleAtFixedRate(new TimerTask() {
                    @Override
                    public void run() {
                        runOnUiThread(new Runnable() {
                            @Override
                            public void run() {
                                if (seconds == 60) {
                                    timerValue.setText(String.format("%02d", hour) + ":" + String.format("%02d", minutes) + ":" + String.format("%02d", seconds));
                                    minutes = seconds / 60;
                                    seconds = seconds % 60;
                                    hour = minutes / 60;
                                }
                                seconds += 1;
                                timerValue.setText(String.format("%02d", hour) + ":" + String.format("%02d", minutes) + ":" + String.format("%02d", seconds));
                            }
                        });
                    }
                }, 0, 1000);
            }
        });
    }

    private void bindView() {
        timerValue = (TextView) findViewById(R.id.timerValue);
        startButton = (Button) findViewById(R.id.startButton);
    }
}

在布局中，有一个 TextView 和一个 Button 来启动计时器。我有使用 Timer 类方法scheduleAtFixedRate。时间将以 hh:mm:ss 形式显示。

Answer 6

我为 textView 中的计时器显示编写了代码。格式用于例如：-02:59:00

您可以点击此链接获取Step By Step代码。

https://stackoverflow.com/a/58316149/11613683

Answer 7

这可以使用cronometer来完成，最主要原因是支持API 1+，这比支持API 17+的TextClock令人印象深刻。

你可以用 cronometer 做很多其他的事情。例如，您可以在其中设置开始时间

chronometer.setBase(SystemClock.elapsedRealtime());

您还可以在此处了解更多信息。