Question

如何在天文钟中设置开始，停止，重置？

我在我的应用中实现了计时器。我创建了三个按钮启动，停止，重置 start：从00:00开始计时。停止：完全停止计时器，显示运行时间。 reset：将计时器重置为00:00。

我正在尝试这样做，但是我的代码表现得很奇怪。

public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
}
public void startButton(View view) {
    ((Chronometer) findViewById(R.id.chronometer)).start();
}  


public void stopButton(View view) {
    ((Chronometer) findViewById(R.id.chronometer)).stop();
}
public void resetButton(View view) {
    ((Chronometer) 
findViewById(R.id.chronometer)).setBase(SystemClock.elapsedRealtime());
}}

我该如何解决这个问题？我只想实现一个开始按钮（从00:00开始），停止按钮（停止计时器并显示运行时间）和一个重置按钮（将计时器完全重置为00:00）。

Answer 1

尝试

    import android.os.Bundle;
import android.os.SystemClock;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.Chronometer;

public class MainActivity extends AppCompatActivity {

    Chronometer simpleChronometer;
    Button start, stop, restart, setFormat, clearFormat;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        // initiate views
        simpleChronometer = (Chronometer) findViewById(R.id.simpleChronometer);
        start = (Button) findViewById(R.id.startButton);
        stop = (Button) findViewById(R.id.stopButton);
        restart = (Button) findViewById(R.id.restartButton);
        setFormat = (Button) findViewById(R.id.setFormat);
        clearFormat = (Button) findViewById(R.id.clearFormat);
        // perform click  event on start button to start a chronometer
        start.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub

                simpleChronometer.start();
            }
        });

        // perform click  event on stop button to stop the chronometer
        stop.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub

                simpleChronometer.stop();
            }
        });

        // perform click  event on restart button to set the base time on chronometer
        restart.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub

                simpleChronometer.setBase(SystemClock.elapsedRealtime());
            }
        });

        // perform click  event on set Format button to set the format of chronometer
        setFormat.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub

                simpleChronometer.setFormat("Time (%s)");
            }
        });

        // perform click  event on clear button to clear the current format of chronmeter as you set through set format
        clearFormat.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub

                simpleChronometer.setFormat(null);
            }
        });
    }


}

Answer 2

我知道可能会晚一点，这可以在以后帮助某人

stop = (Button) findViewById(R.id.stopButton);
chronometer = findViewById(R.id.chronometerID);

stop.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                 chronometer.stop();
                 chronometer.setBase(SystemClock.elapsedRealtime());
            }
        });

如何在Android中启动，停止和重置计时器？

2 个答案: