51

如何从 Chronometer 获取时间?我尝试了 getText、getFormat、getBase 等,但它们都不起作用。

示例代码片段:

Chronometer t = (Chronometer)findViewById(R.id.toptime);
long time = SystemClock.elapsedRealtime()-t.getBase();
Log.d(null,"Was: "+time); //time is not the proper time for some reason - it is a random number between 0 and 50
t.setBase(SystemClock.elapsedRealtime());
t.start();
4

7 回答 7

111

如果您查看 Chronometer 类的源代码,您会发现它不会将经过的时间存储在字段中,并且每次需要更新显示时都会在内部计算它。

然而,在你自己的代码中做同样的事情相对容易:

long elapsedMillis = SystemClock.elapsedRealtime() - chronometerInstance.getBase();

这假设你已经开始你的时钟是这样的:

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

这是一个完整的例子:

public class ChronoExample extends Activity {
Chronometer mChronometer;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    LinearLayout layout = new LinearLayout(this);
    layout.setOrientation(LinearLayout.VERTICAL);

    mChronometer = new Chronometer(this);
    layout.addView(mChronometer);

    Button startButton = new Button(this);
    startButton.setText("Start");
    startButton.setOnClickListener(mStartListener);
    layout.addView(startButton);

    Button stopButton = new Button(this);
    stopButton.setText("Stop");
    stopButton.setOnClickListener(mStopListener);
    layout.addView(stopButton);

    Button resetButton = new Button(this);
    resetButton.setText("Reset");
    resetButton.setOnClickListener(mResetListener);
    layout.addView(resetButton);        

    setContentView(layout);
}

private void showElapsedTime() {
    long elapsedMillis = SystemClock.elapsedRealtime() - mChronometer.getBase();            
    Toast.makeText(ChronoExample.this, "Elapsed milliseconds: " + elapsedMillis, 
            Toast.LENGTH_SHORT).show();
}

View.OnClickListener mStartListener = new OnClickListener() {
    public void onClick(View v) {
        mChronometer.start();
        showElapsedTime();
    }
};

View.OnClickListener mStopListener = new OnClickListener() {
    public void onClick(View v) {
        mChronometer.stop();
        showElapsedTime();
    }
};

View.OnClickListener mResetListener = new OnClickListener() {
    public void onClick(View v) {
        mChronometer.setBase(SystemClock.elapsedRealtime());
        showElapsedTime();
    }
};
}

关于 Chronometer 的一个有点令人困惑的事情是,您不能真正将它用作开始、停止和重新启动的秒表。当它运行时,它将始终显示自上次重置以来经过的时间,无论您在此期间停止了多少次和多长时间。当它停止时,它只是停止更新显示。

如果你需要像秒表这样的东西,你必须继承 Chronometer 或者使用source创建你自己的版本。

替代文字

于 2009-02-08T22:59:13.760 回答
13

我发现这个例子非常有用,谢谢 nyenyec!

这是我关于如何将其变成真正的秒表功能的两分钱,而无需子类化 Chronometer。只需更改 mStartListener 方法以解析来自 mChronometer 的文本(它毕竟是从 TextView 派生的),计算毫秒,然后使用 setBase() 将基准时间重新调整为过去的时间量:

  View.OnClickListener mStartListener = new OnClickListener() {
    public void onClick(View v) {

      int stoppedMilliseconds = 0;

      String chronoText = mChronometer.getText().toString();
      String array[] = chronoText.split(":");
      if (array.length == 2) {
        stoppedMilliseconds = Integer.parseInt(array[0]) * 60 * 1000
            + Integer.parseInt(array[1]) * 1000;
      } else if (array.length == 3) {
        stoppedMilliseconds = Integer.parseInt(array[0]) * 60 * 60 * 1000 
            + Integer.parseInt(array[1]) * 60 * 1000
            + Integer.parseInt(array[2]) * 1000;
      }

      mChronometer.setBase(SystemClock.elapsedRealtime() - stoppedMilliseconds);
      mChronometer.start();
    }
  };
于 2009-08-18T00:42:32.580 回答
4

@nyenyec +1:这是我最终得到的结果,同时使用了没有子类的 nyenyec 的响应。

        chronometer.setOnChronometerTickListener(new OnChronometerTickListener() {                      
        @Override
        public void onChronometerTick(Chronometer chronometer) {
            long elapsedMillis = SystemClock.elapsedRealtime() - chronometer.getBase();
            if(elapsedMillis>THRESHOLD){
                doYourStuff();
            }
        }
    });

其中阈值是

private static final int THRESHOLD_EXERSISE = 60000; //In milliseconds
于 2011-04-07T09:22:34.827 回答
4

回复有点晚,但我今天试图自己解决这个问题。我最终只是解析了视图的文本:

    // Expects a string in the form MM:SS or HH:MM:SS
public static int getSecondsFromDurationString(String value){

    String [] parts = value.split(":");

    // Wrong format, no value for you.
    if(parts.length < 2 || parts.length > 3)
        return 0;

    int seconds = 0, minutes = 0, hours = 0;

    if(parts.length == 2){
        seconds = Integer.parseInt(parts[1]);
        minutes = Integer.parseInt(parts[0]);
    }
    else if(parts.length == 3){
        seconds = Integer.parseInt(parts[2]);
        minutes = Integer.parseInt(parts[1]);
        hours = Integer.parseInt(parts[0]);
    }

    return seconds + (minutes*60) + (hours*3600);
}

因此,使用 view.getText().toString() 调用 getSecondsFromDurationString 可为您提供以秒为单位的总经过时间(我的应用程序是某种秒表,因此您可以暂停并恢复它)。

希望能帮助到你。

于 2013-12-24T03:40:48.730 回答
2

我的解决方案:

    public void starttimer(View view){
    Button mybtn = (Button) view;
    if (mybtn.equals(findViewById(R.id.button1))) {
        mycm.setBase(SystemClock.elapsedRealtime() - elapsed);
        mycm.start();
    }
    else {
        mycm.stop();
        elapsed = SystemClock.elapsedRealtime() -  mycm.getBase();
    }
}

在 onCreate 中:

    mycm = (Chronometer) findViewById(R.id.chronometer1);
    elapsed = 0;

布局中有两个按钮都调用 starttimer 方法(开始和停止)

于 2011-12-22T08:53:30.700 回答
0
    final Chronometer counter = (Chronometer) findViewById(R.id.chronometer1);
    counter.setOnChronometerTickListener(new OnChronometerTickListener() {

        public void onChronometerTick(Chronometer chronometer) {
            // TODO Auto-generated method stub
            chronometer.refreshDrawableState();

        }
    });

    final ToggleButton togglebutton = (ToggleButton) findViewById(R.id.togglebutton1);
    togglebutton.setOnClickListener(new OnClickListener() {
        public void onClick(View v) {
            // Perform action on clicks
            if (togglebutton.isChecked()) {
                counter.start();
            } else {
                counter.stop();
            }
        }
    });
于 2011-11-11T04:29:32.140 回答
0
//ok here is the final changed code which works well

import android.app.Activity;
import android.os.Bundle;
import android.os.SystemClock;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Chronometer;
import android.widget.LinearLayout;
import android.widget.Toast;

public class HelloWidgetActivity extends Activity {
    Chronometer mChronometer;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        LinearLayout layout = new LinearLayout(this);
        layout.setOrientation(LinearLayout.VERTICAL);

        mChronometer = new Chronometer(this);
        layout.addView(mChronometer);

        Button startButton = new Button(this);
        startButton.setText("Start");
        startButton.setOnClickListener(mStartListener);
        layout.addView(startButton);

        Button stopButton = new Button(this);
        stopButton.setText("Stop");
        stopButton.setOnClickListener(mStopListener);
        layout.addView(stopButton);

        Button resetButton = new Button(this);
        resetButton.setText("Reset");
        resetButton.setOnClickListener(mResetListener);
        layout.addView(resetButton);

        setContentView(layout);
    }

    private void showElapsedTime() {
        long elapsedMillis = SystemClock.elapsedRealtime()
                - mChronometer.getBase();
        Toast.makeText(HelloWidgetActivity.this,
                "Elapsed milliseconds: " + elapsedMillis, Toast.LENGTH_SHORT).show();
    }



    View.OnClickListener mStartListener = new OnClickListener() {
        public void onClick(View v) {
          int stoppedMilliseconds = 0;
          String chronoText = mChronometer.getText().toString();
          String array[] = chronoText.split(":");
          if (array.length == 2) {
            stoppedMilliseconds = Integer.parseInt(array[0]) * 60 * 1000
                + Integer.parseInt(array[1]) * 1000;
          } else if (array.length == 3) {
            stoppedMilliseconds = Integer.parseInt(array[0]) * 60 * 60 * 1000 
                + Integer.parseInt(array[1]) * 60 * 1000
                + Integer.parseInt(array[2]) * 1000;
          }
          mChronometer.setBase(SystemClock.elapsedRealtime() - stoppedMilliseconds);
          mChronometer.start();
        }
      };

    View.OnClickListener mStopListener = new OnClickListener() {
        public void onClick(View v) {
            mChronometer.stop();
            showElapsedTime();
        }
    };

    View.OnClickListener mResetListener = new OnClickListener() {
        public void onClick(View v) {
            mChronometer.setBase(SystemClock.elapsedRealtime());
            mChronometer.stop();
            showElapsedTime();
        }
    };
}
于 2012-05-07T09:55:58.673 回答