Android的 - 希望应用程序来执行任务，每一秒 [英] Android - Want app to perform tasks every second
问题描述
我试图让我的倒计时应用程序来执行更新我的当前时间和日期的TextView的职能和火了其MyOnItemSelectedListener每一秒，这样的应用程序计算的刚下来，而不是动态时的onCreate开始。如果有一个更有效的方法，然后迅速发射了MyOnItemSelectedListener我想AP preciate批评。
I'm trying to get my countdown app to perform its function of updating my current time and date TextView and fire off its MyOnItemSelectedListener every second so that the app counts down dynamically instead of just when onCreate is initiated. If there is a more efficient method then rapidly firing off MyOnItemSelectedListener I would appreciate the criticism.
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：这个崩溃的应用程序，并把它提出来的时候的onCreate（）被调用的LogCat中
@NamLe: This crashes the app and brings this up in the LogCat when onCreate() is called.
02-23 13：19：43.540：我/的System.out（11667）：太阳6月24日0点零零分00秒MDT 2012
02-23 13：19：44.500：W / dalvikvm（11667）：主题ID = 11：线程退出与未捕获的异常（组= 0x40a351f8）
02-23 13：19：44.510：E / AndroidRuntime（11667）：致命异常：定时器0
02-23 13：19：44.510：E / AndroidRuntime（11667）：android.view.ViewRootImpl $ CalledFromWrongThreadException：只有创建视图层次可以触摸其观点原来的线程。
02-23 13：19：44.510：E / AndroidRuntime（11667）：在android.view.ViewRootImpl.checkThread（ViewRootImpl.java:4039）
02-23 13：19：44.510：E / AndroidRuntime（11667）：在android.view.ViewRootImpl.requestLayout（ViewRootImpl.java:709）
02-23 13：19：44.510：E / AndroidRuntime（11667）：在android.view.View.requestLayout（View.java:12675）
02-23 13：19：44.510：E / AndroidRuntime（11667）：在android.view.View.requestLayout（View.java:12675）
02-23 13：19：44.510：E / AndroidRuntime（11667）：在android.view.View.requestLayout（View.java:12675）
02-23 13：19：44.510：E / AndroidRuntime（11667）：在android.view.View.requestLayout（View.java:12675）
02-23 13：19：44.510：E / AndroidRuntime（11667）：在android.view.View.requestLayout（View.java:12675）
02-23 13：19：44.510：E / AndroidRuntime（11667）：在android.widget.TextView.checkForRelayout（TextView.java:6773）
02-23 13：19：44.510：E / AndroidRuntime（11667）：在android.widget.TextView.setText（TextView.java:3306）
02-23 13：19：44.510：E / AndroidRuntime（11667）：在android.widget.TextView.setText（TextView.java:3162）
02-23 13：19：44.510：E / AndroidRuntime（11667）：在android.widget.TextView.setText（TextView.java:3137）
02-23 13：19：44.510：E / AndroidRuntime（11667）：在com.pixelcrunch.crunchtime.TheCount $ 1.运行（TheCount.java:87）
02-23 13：19：44.510：E / AndroidRuntime（11667）：在java.util.Timer中的$ TimerImpl.run（Timer.java:284）
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)
推荐答案
尝试使用 UpdateDisplay 之类的函数如下：
Try to use UpdateDisplay function like below:
private void updateDisplay() {
Timer timer = new Timer();
timer.schedule(new TimerTask() {
@Override
public void run() {
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);
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))
);
}
},0,1000);//Update text every second
}
最后，必须调用 updateDisplay（）在的onCreate（）功能。
我希望这code可以帮助你完成你想要的！
Finally, you must to call updateDisplay() in onCreate() function.
I hope this code would help you finish what you want !
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