Sto cercando di ottenere la mia app conto alla rovescia per eseguire la sua funzione di aggiornamento mia ora e data TextView e spegne il suo MyOnItemSelectedListener ogni secondo in modo che l'app esegue il conto alla rovescia in modo dinamico anziché solo quando viene avviato onCreate. Se esiste un metodo più efficiente che spegne rapidamente MyOnItemSelectedListener, apprezzerei le critiche.Android - Vuoi app per eseguire attività ogni secondo
public class TheCount extends Activity {
TextView description=null;
TextView dates=null;
TextView times=null;
TextView output=null;
TextView cDateDisplay=null;
TextView cTimeDisplay=null;
private int mYear;
private int mMonth;
private int mDay;
private int mHour;
private int mMinute;
private int mSecond;
CountdownHelper helper=null;
String countdownId=null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.thecount);
helper=new CountdownHelper(this);
cTimeDisplay = (TextView)findViewById(R.id.lblCurTime);
cDateDisplay = (TextView)findViewById(R.id.lblCurDate);
final Calendar c = Calendar.getInstance();
mYear = c.get(Calendar.YEAR);
mMonth = c.get(Calendar.MONTH);
mDay = c.get(Calendar.DAY_OF_MONTH);
mHour = c.get(Calendar.HOUR_OF_DAY);
mMinute = c.get(Calendar.MINUTE);
mSecond = c.get(Calendar.SECOND);
Spinner spinner = (Spinner) findViewById(R.id.spinner1);
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(
this, R.array.countoptions, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(adapter);
description =(TextView)findViewById(R.id.lblDescriptFed);
dates =(TextView)findViewById(R.id.lblDateFed);
times =(TextView)findViewById(R.id.lblTimeFed);
output =(TextView)findViewById(R.id.lblOutput);
countdownId=getIntent().getStringExtra(MainActivity.ID_EXTRA);
if (countdownId!=null) {
load();
}
spinner.setOnItemSelectedListener(new MyOnItemSelectedListener());
updateDisplay();
}
private void updateDisplay() {
Timer timer = new Timer();
timer.schedule(new TimerTask() {
//@Override
public void run() {
updatedDisplay();
}
},0,1000);//Update text every second
}
public class MyOnItemSelectedListener implements OnItemSelectedListener {
public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
if (parent.getItemAtPosition(pos).toString().equals("Normal")){
Toast.makeText(parent.getContext(), "Countdown format is " +
parent.getItemAtPosition(pos).toString(), Toast.LENGTH_LONG).show();
convertTime();
} else if (parent.getItemAtPosition(pos).toString().equals("by Days")){
Toast.makeText(parent.getContext(), "Countdown format " +
parent.getItemAtPosition(pos).toString(), Toast.LENGTH_LONG).show();
convertDays();
} else if (parent.getItemAtPosition(pos).toString().equals("by Hours")){
Toast.makeText(parent.getContext(), "Countdown format " +
parent.getItemAtPosition(pos).toString(), Toast.LENGTH_LONG).show();
convertHours();
} else if (parent.getItemAtPosition(pos).toString().equals("by Minutes")){
Toast.makeText(parent.getContext(), "Countdown format " +
parent.getItemAtPosition(pos).toString(), Toast.LENGTH_LONG).show();
convertMinutes();
} else if (parent.getItemAtPosition(pos).toString().equals("by Seconds")){
Toast.makeText(parent.getContext(), "Countdown format " +
parent.getItemAtPosition(pos).toString(), Toast.LENGTH_LONG).show();
convertSeconds();
}
}
public void onNothingSelected(AdapterView parent) {
// Do nothing.
}
}
private void convertTime() {
String dtCountdown = dates.getText().toString() + " " + times.getText().toString();
String dtCurrent = cDateDisplay.getText().toString() + " " + cTimeDisplay.getText().toString();
SimpleDateFormat format = new SimpleDateFormat("dd/MM/yyyy hh:mm:ss");
try {
Date date = format.parse(dtCountdown);
Date dateCur = format.parse(dtCurrent);
long diff = dateCur.getTime() - date.getTime();
int timeInSeconds = (int) (diff/1000);
int days, hours, minutes, seconds;
days = timeInSeconds/86400;
timeInSeconds = timeInSeconds - (days * 86400);
hours = timeInSeconds/3600;
timeInSeconds = timeInSeconds - (hours * 3600);
minutes = timeInSeconds/60;
timeInSeconds = timeInSeconds - (minutes * 60);
seconds = timeInSeconds;
System.out.println(date);
if(dateCur.compareTo(date)>0){
output.setText(String.valueOf(days) + " days " + String.valueOf(hours) +
" hours \n" + String.valueOf(minutes) + " minutes " + String.valueOf(seconds) + " seconds ago");
} else {
output.setText(String.valueOf(Math.abs(days)) + " days " + String.valueOf(Math.abs(hours)) +
" hours \n" + String.valueOf(Math.abs(minutes)) + " minutes " + String.valueOf(Math.abs(seconds)) + " seconds till");
}
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private void convertDays() {
String dtCountdown = dates.getText().toString() + " " + times.getText().toString();
String dtCurrent = cDateDisplay.getText().toString() + " " + cTimeDisplay.getText().toString();
SimpleDateFormat format = new SimpleDateFormat("dd/MM/yyyy hh:mm");
try {
Date date = format.parse(dtCountdown);
Date dateCur = format.parse(dtCurrent);
long diff = dateCur.getTime() - date.getTime();
int timeInSeconds = (int) (diff/1000);
int days;
days = timeInSeconds/86400;
System.out.println(date);
if(dateCur.compareTo(date)>0){
output.setText(String.valueOf(days) + " days ago");
} else {
output.setText(String.valueOf(Math.abs(days)) + " days till");
}
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private void convertHours() {
String dtCountdown = dates.getText().toString() + " " + times.getText().toString();
String dtCurrent = cDateDisplay.getText().toString() + " " + cTimeDisplay.getText().toString();
SimpleDateFormat format = new SimpleDateFormat("dd/MM/yyyy hh:mm");
try {
Date date = format.parse(dtCountdown);
Date dateCur = format.parse(dtCurrent);
long diff = dateCur.getTime() - date.getTime();
int timeInSeconds = (int) (diff/1000);
int hours;
hours = timeInSeconds/3600;
System.out.println(date);
if(dateCur.compareTo(date)>0){
output.setText(String.valueOf(hours) + " hours ago");
} else {
output.setText(String.valueOf(Math.abs(hours)) + " hours till");
}
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private void convertMinutes() {
String dtCountdown = dates.getText().toString() + " " + times.getText().toString();
String dtCurrent = cDateDisplay.getText().toString() + " " + cTimeDisplay.getText().toString();
SimpleDateFormat format = new SimpleDateFormat("dd/MM/yyyy hh:mm");
try {
Date date = format.parse(dtCountdown);
Date dateCur = format.parse(dtCurrent);
long diff = dateCur.getTime() - date.getTime();
int timeInSeconds = (int) (diff/1000);
int minutes;
minutes = timeInSeconds/60;
System.out.println(date);
if(dateCur.compareTo(date)>0){
output.setText(String.valueOf(minutes) + " minutes ago");
} else {
output.setText(String.valueOf(Math.abs(minutes)) + " minutes till");
}
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private void convertSeconds() {
String dtCountdown = dates.getText().toString() + " " + times.getText().toString();
String dtCurrent = cDateDisplay.getText().toString() + " " + cTimeDisplay.getText().toString();
SimpleDateFormat format = new SimpleDateFormat("dd/MM/yyyy hh:mm");
try {
Date date = format.parse(dtCountdown);
Date dateCur = format.parse(dtCurrent);
long diff = dateCur.getTime() - date.getTime();
int timeInSeconds = (int) (diff/1000);
int seconds;
seconds = timeInSeconds;
System.out.println(date);
if(dateCur.compareTo(date)>0){
output.setText(String.valueOf(seconds) + " seconds ago");
} else {
output.setText(String.valueOf(Math.abs(seconds)) + " seconds till");
}
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private void updatedDisplay() {
TextView cDateDisplay=null;
TextView cTimeDisplay=null;
cTimeDisplay = (TextView)findViewById(R.id.lblCurTime);
cDateDisplay = (TextView)findViewById(R.id.lblCurDate);
cDateDisplay.setText(
new StringBuilder()
// Month is 0 based so add 1
.append(mDay).append("/")
.append(mMonth + 1).append("/")
.append(mYear).append(" "));
cTimeDisplay.setText(
new StringBuilder()
.append(pad(mHour)).append(":")
.append(pad(mMinute)).append(":").append(pad(mSecond)));
}
private static String pad(int c) {
if (c >= 10)
return String.valueOf(c);
else
return "0" + String.valueOf(c);
}
private void load() {
Cursor c=helper.getById(countdownId);
c.moveToFirst();
description.setText(helper.getDescription(c));
dates.setText(helper.getDate(c));
times.setText(helper.getTime(c) + ":00");
c.close();
}
@Override
public void onDestroy() {
super.onDestroy();
helper.close();
}
}
@NamLe: Questo blocca l'applicazione e porta questo nella LogCat quando viene chiamata onCreate().
02-23 13:19:43.540: I/System.out(11667): Sun Jun 24 00:00:00 MDT 2012 02-23 13:19:44.500: W/dalvikvm(11667): threadid=11: thread exiting with uncaught exception (group=0x40a351f8) 02-23 13:19:44.510: E/AndroidRuntime(11667): FATAL EXCEPTION: Timer-0 02-23 13:19:44.510: E/AndroidRuntime(11667): android.view.ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views. 02-23 13:19:44.510: E/AndroidRuntime(11667): at android.view.ViewRootImpl.checkThread(ViewRootImpl.java:4039) 02-23 13:19:44.510: E/AndroidRuntime(11667): at android.view.ViewRootImpl.requestLayout(ViewRootImpl.java:709) 02-23 13:19:44.510: E/AndroidRuntime(11667): at android.view.View.requestLayout(View.java:12675) 02-23 13:19:44.510: E/AndroidRuntime(11667): at android.view.View.requestLayout(View.java:12675) 02-23 13:19:44.510: E/AndroidRuntime(11667): at android.view.View.requestLayout(View.java:12675) 02-23 13:19:44.510: E/AndroidRuntime(11667): at android.view.View.requestLayout(View.java:12675) 02-23 13:19:44.510: E/AndroidRuntime(11667): at android.view.View.requestLayout(View.java:12675) 02-23 13:19:44.510: E/AndroidRuntime(11667): at android.widget.TextView.checkForRelayout(TextView.java:6773) 02-23 13:19:44.510: E/AndroidRuntime(11667): at android.widget.TextView.setText(TextView.java:3306) 02-23 13:19:44.510: E/AndroidRuntime(11667): at android.widget.TextView.setText(TextView.java:3162) 02-23 13:19:44.510: E/AndroidRuntime(11667): at android.widget.TextView.setText(TextView.java:3137) 02-23 13:19:44.510: E/AndroidRuntime(11667): at com.pixelcrunch.crunchtime.TheCount$1.run(TheCount.java:87) 02-23 13:19:44.510: E/AndroidRuntime(11667): at java.util.Timer$TimerImpl.run(Timer.java:284)
Grazie! Ho aggiunto il codice runOnUiThread() e l'ho fatto funzionare. Non sono sicuro di quanto sia intensa questa piccola attività e se questa è una cattiva programmazione, ma per lo scopo sembra funzionare. –
Oh. Si dovrebbe prestare attenzione al thread in background e al thread dell'interfaccia utente. In questo caso, è necessario il thread UI per il testo dell'ora della data di aggiornamento. E l'oggetto Timer è la scelta migliore. Se si desidera aggiornare la percentuale del thread di download, è necessario utilizzare l'oggetto Gestore. Google ha molti esempi: D – NamLe