Semplice Binary Android Text Clock
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26-09-2019 - |
Domanda
Voglio creare un semplice Android orologio binario, ma la mia domanda si blocca. Uso 6 campi TextView: 3 per il decimale e 3 per la rappresentazione binaria del tempo corrente (hh: mm: ss). Ecco il codice:
import java.text.SimpleDateFormat;
import java.util.Calendar;
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
public class Binary extends Activity implements Runnable
{
Thread runner;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
if (runner == null)
{ //start the song
runner = new Thread(this);
runner.start();
}
}
@Override
public void run()
{
TextView hours_dec = (TextView) findViewById(R.id.hours_dec);
TextView mins_dec = (TextView) findViewById(R.id.mins_dec);
TextView secs_dec = (TextView) findViewById(R.id.secs_dec);
TextView hours_bin = (TextView) findViewById(R.id.hours_bin);
TextView mins_bin = (TextView) findViewById(R.id.mins_bin);
TextView secs_bin = (TextView) findViewById(R.id.secs_bin);
SimpleDateFormat hours_sdf = new SimpleDateFormat("HH");
SimpleDateFormat mins_sdf = new SimpleDateFormat("mm");
SimpleDateFormat secs_sdf = new SimpleDateFormat("ss");
Calendar cal = Calendar.getInstance();
while (runner != null)
{
WaitAMoment();
cal.getTime();
hours_dec.setText(hours_sdf.format(cal.getTime()));
mins_dec.setText(mins_sdf.format(cal.getTime()));
secs_dec.setText(secs_sdf.format(cal.getTime()));
hours_bin.setText(String.valueOf(Integer.toBinaryString(Integer.parseInt((String) hours_dec.getText()))));
mins_bin.setText(String.valueOf(Integer.toBinaryString(Integer.parseInt((String) mins_dec.getText()))));
secs_bin.setText(String.valueOf(Integer.toBinaryString(Integer.parseInt((String) secs_dec.getText()))));
}
}
protected void WaitAMoment()
{
try
{
Thread.sleep(100);
} catch (InterruptedException e) { };
}
}`
Soluzione
Si sta cercando di aggiornare i componenti Vista da un altro thread. È necessario separare gli aggiornamenti dei componenti in un oggetto Runnable, con un gestore che si chiama dal secondo thread.
Per ulteriori informazioni: https://developer.android.com /guide/appendix/faq/commontasks.html#threading
E il codice per il bonus:
package stackoverflow.test.binaryclock;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.widget.TextView;
public class BinaryClock extends Activity implements Runnable
{
Date currentTime;
Thread runner;
final Runnable updater = new Runnable(){
public void run(){
updateClockValues();
};
};
final Handler mHandler = new Handler();
TextView hours_dec;
TextView mins_dec;
TextView secs_dec;
TextView hours_bin;
TextView mins_bin;
TextView secs_bin;
SimpleDateFormat hours_sdf = new SimpleDateFormat("HH");
SimpleDateFormat mins_sdf = new SimpleDateFormat("mm");
SimpleDateFormat secs_sdf = new SimpleDateFormat("ss");
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
currentTime = Calendar.getInstance().getTime();
hours_dec = (TextView) findViewById(R.id.hours_dec);
mins_dec = (TextView) findViewById(R.id.mins_dec);
secs_dec = (TextView) findViewById(R.id.secs_dec);
hours_bin = (TextView) findViewById(R.id.hours_bin);
mins_bin = (TextView) findViewById(R.id.mins_bin);
secs_bin = (TextView) findViewById(R.id.secs_bin);
if (runner == null)
{ //start the song
runner = new Thread(this);
runner.start();
}
}
private void updateClockValues() {
currentTime = Calendar.getInstance().getTime();
hours_dec.setText(hours_sdf.format(currentTime.getTime()));
mins_dec.setText(mins_sdf.format(currentTime.getTime()));
secs_dec.setText(secs_sdf.format(currentTime.getTime()));
hours_bin.setText(String.valueOf(Integer.toBinaryString(Integer.parseInt((String) hours_dec.getText()))));
mins_bin.setText(String.valueOf(Integer.toBinaryString(Integer.parseInt((String) mins_dec.getText()))));
secs_bin.setText(String.valueOf(Integer.toBinaryString(Integer.parseInt((String) secs_dec.getText()))));
}
@Override
public void run()
{
while (runner != null)
{
try
{
Thread.sleep(1000);
Log.i("Tick", "Tock");
} catch (InterruptedException e) { };
mHandler.post(updater);
}
}
}
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