Android 如何使用布尔停止线程？
我希望应用程序的线程在onclick和ondestroy中停止，这意味着我希望当单击按钮时线程停止，当我退出应用程序时，现在即使我退出它，线程也不会停止。。。我应该把我的while（！shutdown）放在哪里？对不起，我是新来的。。非常感谢你的帮助Android 如何使用布尔停止线程？,android,multithreading,Android,Multithreading,我希望应用程序的线程在onclick和ondestroy中停止，这意味着我希望当单击按钮时线程停止，当我退出应用程序时，现在即使我退出它，线程也不会停止。。。我应该把我的while（！shutdown）放在哪里？对不起，我是新来的。。非常感谢你的帮助 package com.example.suntracking; import java.util.Calendar; import android.app.Activity; import android.content.Intent
package com.example.suntracking;
import java.util.Calendar;
import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.Bundle;
import android.os.Handler;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends Activity implements View.OnClickListener{
//showing input and output
TextView aziangle,elevation,numberof,rightasc,decli,hourangle,solartime,showinlat,showinlong,
showintimezone,showindlst,showinofftime,showinoffazi,showinoffele,showinoffphi,showinofflamda,showinoffxi,
showdate,showtime,showday;
Button editting;
Float latval,longval,offtimeval,offazival,offeleval,offphival,offlamdaval,offxival;
int timeval,taketimesec,taketimeminute,taketimehour,takedateday,takedatemonth,takedateyear;
String show1,show2,show3,show4,sshowday,takeampmtext;
//for clock
int timesec,timeminute,timehour,dateday,datemonth,dateyear,day,ampm;
String daytext,ampmtext,showazi,showele,shownoday,showra,showdecli,showh_angle,shows_time;
Handler mHandler = new Handler();
Thread r;
volatile boolean shutdown = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initialize();
loadSavedpreferences();
r = new Thread(new Runnable(){
@Override
public void run() {
// TODO Auto-generated method stub
while (true) {
try {
Thread.sleep(1000);
mHandler.post(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
// Write your code here to update the UI.
Save_fetchPref();
run_cal();
}
private void run_cal() {
// TODO Auto-generated method stub
Intent j=new Intent(MainActivity.this,Calculation.class);
startActivity(j);
}
private void Save_fetchPref() {
// TODO Auto-generated method stub
Calendar c = Calendar.getInstance();
timesec = c.get(Calendar.SECOND);
timeminute = c.get(Calendar.MINUTE);
timehour = c.get(Calendar.HOUR_OF_DAY);
ampm = c.get(Calendar.AM_PM);
if(ampm==0){
ampmtext="AM";
}else {
ampmtext="PM";
}
dateday = c.get(Calendar.DAY_OF_MONTH);
datemonth = c.get(Calendar.MONTH);
datemonth += 1;
dateyear = c.get(Calendar.YEAR);
day = c.get(Calendar.DAY_OF_WEEK);
switch(day){
case 1:
daytext="SUNDAY";
break;
case 2:
daytext="MONDAY";
break;
case 3:
daytext="TUESDAY";
break;
case 4:
daytext="WEDNESDAY";
break;
case 5:
daytext="THURSDAY";
break;
case 6:
daytext="FRIDAY";
break;
case 7:
daytext="SATURDAY";
break;
}
savePreferences();
loadSavedpreferences();
}
});
} catch (Exception e) {
// TODO: handle exception
}
}
}
});
r.start();
}
private void savePreferences() {
// TODO Auto-generated method stub
SharedPreferences savedata = getSharedPreferences("savealldata",0);
Editor editor=savedata.edit();
editor.putInt("timesec",timesec);
editor.putInt("timeminute", timeminute);
editor.putInt("timehour", timehour);
editor.putInt("dateday", dateday);
editor.putInt("datemonth", datemonth);
editor.putInt("dateyear", dateyear);
editor.putInt("ampm", ampm);
editor.putString("daytext", daytext);
editor.putString("ampmtext", ampmtext);
editor.commit();
}
private void initialize() {
// TODO Auto-generated method stub
aziangle=(TextView)findViewById(R.id.tvAziAngle);
elevation=(TextView)findViewById(R.id.tvElevation);
numberof=(TextView)findViewById(R.id.tvNumberof);
rightasc=(TextView)findViewById(R.id.tvRightAsc);
decli=(TextView)findViewById(R.id.tvDecli);
hourangle=(TextView)findViewById(R.id.tvHourAngle);
solartime=(TextView)findViewById(R.id.tvSolarTime);
showday=(TextView)findViewById(R.id.tvDay);
showdate=(TextView)findViewById(R.id.tvDate);
showtime=(TextView)findViewById(R.id.tvTime);
showinlat=(TextView)findViewById(R.id.tvShowInLat);
showinlong=(TextView)findViewById(R.id.tvShowInLong);
showintimezone=(TextView)findViewById(R.id.tvShowInTimeZone);
showindlst=(TextView)findViewById(R.id.tvShowInDLST);
showinofftime=(TextView)findViewById(R.id.tvShowInOffTime);
showinoffazi=(TextView)findViewById(R.id.tvShowInOffAzimuth);
showinoffele=(TextView)findViewById(R.id.tvShowInOffElevation);
showinoffphi=(TextView)findViewById(R.id.tvShowInOffphi);
showinofflamda=(TextView)findViewById(R.id.tvShowInOfflamda);
showinoffxi=(TextView)findViewById(R.id.tvShowInOffxi);
editting=(Button)findViewById(R.id.bedit);
editting.setOnClickListener(this);
}
private void loadSavedpreferences() {
// TODO Auto-generated method stub
SharedPreferences savedata= getSharedPreferences("savealldata",0);
//input
sshowday=savedata.getString("daytext",null);
showday.setText(sshowday);
takedateday=savedata.getInt("dateday",00);
takedatemonth=savedata.getInt("datemonth", 00);
takedateyear=savedata.getInt("dateyear", 00);
showdate.setText(takedateday + "/" + takedatemonth + "/" + takedateyear);
taketimesec=savedata.getInt("timesec", 00);
taketimeminute=savedata.getInt("timeminute", 00);
taketimehour=savedata.getInt("timehour", 00);
takeampmtext=savedata.getString("ampmtext", "AM");
showtime.setText(taketimehour + ":" + taketimeminute + ":" + taketimesec + takeampmtext);
show1=savedata.getString("show1",null);
latval=savedata.getFloat("latval", 0);
showinlat.setText("Latitude : " + latval + ", " + show1);
show2=savedata.getString("show2",null);
longval=savedata.getFloat("longval",0);
showinlong.setText("Longitude : " + longval + ", " + show2);
show3=savedata.getString("show3",null);
timeval=savedata.getInt("timezoneval",0);
showintimezone.setText("Time Zone : " + timeval + show3);
show4=savedata.getString("show4","No");
showindlst.setText("Daylight Saving Time : "+ show4);
offtimeval=savedata.getFloat("show5",0);
showinofftime.setText("Offset Time : " + offtimeval);
offazival=savedata.getFloat("show6",0);
showinoffazi.setText("Offset Azimuth : "+ offazival);
offeleval=savedata.getFloat("show7",0);
showinoffele.setText("Offset Elevation : " + offeleval);
offphival=savedata.getFloat("show8", 0);
showinoffphi.setText("Offset Φ :" + offphival);
offlamdaval=savedata.getFloat("show9", 0);
showinofflamda.setText("Offset λ : "+offlamdaval);
offxival=savedata.getFloat("show10", 0);
showinoffxi.setText("Offset ξ : "+ offxival);
//output
showazi=savedata.getString("azimuth", null);
aziangle.setText("Azimuth Angle : " + showazi);
showele=savedata.getString("elevation", null);
elevation.setText("Elevation Angle" + showele);
shownoday=savedata.getString("jd", null);
numberof.setText("Number of Days : " + shownoday);
showra=savedata.getString("RA", null);
rightasc.setText("Right Ascension : " + showra);
showdecli=savedata.getString("declination", null);
decli.setText("Declination Angle : " + showdecli);
showh_angle=savedata.getString("h_angle", null);
hourangle.setText("Hour Angle : " + showh_angle);
shows_time=savedata.getString("s_time", null);
solartime.setText("Solar Time : " + shows_time);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
shutdown = true;
Intent e=new Intent(MainActivity.this, Parameterlist.class);
startActivity(e);
}
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
shutdown = true ;
}
}
while (true) {
while(!shutdown) {
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
shutdown = true ;
}
我也是Android新手，但您可以尝试在button onClick方法中调用此选项：
if(shutdown){
mHandler.removeCallbacksAndMessages(runnable);
thread.interrupt()
}
但是，如果我使用while（！shutdown）替换while（true），则线程.start（）不会受到影响，那么线程仍将继续运行。如果添加while（！shutdown），则只要shutdown为false，线程就会运行，因此当您将shutdown设置为true时，while将停止，线程将在稍后结束。你不能直接停止线程。我已经更改了它。我知道内容从一开始就不会运行。我发布了已编辑的。没有，请检查我的编辑，并尝试解释什么仍然不起作用。好的，我已经更改了，但仍然不起作用。假设Save_fetchPref（）和run_cal（）应该在应用程序启动后运行，我应该得到它们显示的结果。其中之一是时间应该继续移动，但当我不使用thread.start（）时，即使我在（！shutdown）仍不工作时将其更改为，也不会显示结果，顺便说一句，我得到了行thread.interrupt（）的错误，它建议我编写thread.interrupt（），我想这是不同的事情
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
shutdown = true ;
super.onDestroy();
}
if(shutdown){
mHandler.removeCallbacksAndMessages(runnable);
thread.interrupt()
}