我正在使用Android代码编写代码，以便在Android应用中创建动态服务或运行时服务。我想创建一个服务，它将在内部运行两个动态服务，具有唯一ID。但我无法弄清楚如何做到这一点？请查看我的示例代码：
mycode的：
MainActivity.java
package com.example.multipleservice;
import java.util.Calendar;
import java.util.concurrent.TimeUnit;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.app.Activity;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Intent;
import android.content.SharedPreferences;
import android.widget.TextView;
public class MainActivity extends Activity
{
TextView timer1;
TextView timer2;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
timer1 = (TextView) findViewById(R.id.timer1);
timer2 = (TextView) findViewById(R.id.timer2);
Calendar calendar1 = Calendar.getInstance();
Intent myIntent1 = new Intent(MainActivity.this, MyService.class);
myIntent1.putExtra("Id", "1");
PendingIntent pendingIntent1 = PendingIntent.getBroadcast(MainActivity.this, 0, myIntent1,0);
AlarmManager alarmManager1 = (AlarmManager)getSystemService(ALARM_SERVICE);
alarmManager1.set(AlarmManager.RTC, calendar1.getTimeInMillis(), pendingIntent1);
long tm1 = 0;
String ticket1 = "1";
SharedPreferences timer_saved1 = getApplicationContext().getSharedPreferences("TimerSave"+ticket1, 0);
long timerData1 = timer_saved1.getLong("timer"+ticket1, 0);
long timerValue1 = 0;
long diff_value1 = 36680;
if(timerData1!=0)
{
timerValue1 = timerData1*1000;
}
else
{
timerValue1 = diff_value1*1000;
}
tm1 = timerValue1;
RemainTime1 timera = new RemainTime1(tm1,1000);
timera.start();
Calendar calendar2 = Calendar.getInstance();
Intent myIntent2 = new Intent(MainActivity.this, MyService.class);
myIntent2.putExtra("Id", "2");
PendingIntent pendingIntent2 = PendingIntent.getBroadcast(MainActivity.this, 0, myIntent2,0);
AlarmManager alarmManager2 = (AlarmManager)getSystemService(ALARM_SERVICE);
alarmManager2.set(AlarmManager.RTC, calendar2.getTimeInMillis(), pendingIntent2);
long tm2 = 0;
String ticket2 = "2";
SharedPreferences timer_saved2 = getApplicationContext().getSharedPreferences("TimerSave"+ticket2, 0);
long timerData2 = timer_saved2.getLong("timer"+ticket2, 0);
long timerValue2 = 0;
long diff_value2 = 36880;
if(timerData2!=0)
{
timerValue2 = timerData2*1000;
}
else
{
timerValue2 = diff_value2*1000;
}
tm2 = timerValue2;
RemainTime2 timerb = new RemainTime2(tm2,1000);
timerb.start();
}
public class RemainTime1 extends CountDownTimer
{
public RemainTime1(long millisInFuture, long countDownInterval)
{
super(millisInFuture, countDownInterval);
}
@Override
public void onFinish()
{
}
@Override
public void onTick(long arg0)
{
long millis = arg0;
long hour = TimeUnit.MILLISECONDS.toHours(millis);
long min = TimeUnit.MILLISECONDS.toMinutes(millis) - TimeUnit.HOURS.toMinutes(TimeUnit.MILLISECONDS.toHours(millis));
long sec = TimeUnit.MILLISECONDS.toSeconds(millis) - TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(millis));
long hr = 0;
if(hour>=24)
{
hr = hour - 24*7;
}
else
{
hr = hour;
}
timer1.setText(hr+" hr : "+min+" mins : "+sec+" sec ");
}
}
public class RemainTime2 extends CountDownTimer
{
public RemainTime2(long millisInFuture, long countDownInterval)
{
super(millisInFuture, countDownInterval);
}
@Override
public void onFinish()
{
}
@Override
public void onTick(long arg0)
{
long millis = arg0;
long hour = TimeUnit.MILLISECONDS.toHours(millis);
long min = TimeUnit.MILLISECONDS.toMinutes(millis) - TimeUnit.HOURS.toMinutes(TimeUnit.MILLISECONDS.toHours(millis));
long sec = TimeUnit.MILLISECONDS.toSeconds(millis) - TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(millis));
long hr = 0;
if(hour>=24)
{
hr = hour - 24*7;
}
else
{
hr = hour;
}
timer2.setText(hr+" hr : "+min+" mins : "+sec+" sec ");
}
}}
MySerivce.java
package com.example.multipleservice;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
public class MyService extends BroadcastReceiver
{
@Override
public void onReceive(Context context, Intent intent)
{
Intent service1 = new Intent(context, MyAlarmService.class);
context.startService(service1);
} }
MyAlarmService.java
package com.example.multipleservice;
import java.util.concurrent.TimeUnit;
import android.app.Service;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.CountDownTimer;
import android.os.IBinder;
import android.util.Log;
import android.widget.Chronometer;
import android.widget.Toast;
public class MyAlarmService extends Service
{
@Override
public IBinder onBind(Intent intent)
{
return null;
}
@Override
public void onStart(Intent intent, int startId)
{
String ticket = intent.getStringExtra("Id");
SharedPreferences timer_saved = getApplicationContext().getSharedPreferences("TimerSave"+ticket, 0);
long timerData = timer_saved.getLong("timer"+ticket, 0);
long timerValue = 0;
long diff_value = 0;
if(timerData!=0)
{
timerValue = timerData*1000;
}
else
{
timerValue = diff_value*1000;
}
RemainTime timer = new RemainTime(timerValue,1000);
timer.start();
super.onStart(intent, startId);
}
public class RemainTime extends CountDownTimer
{
public RemainTime(long millisInFuture, long countDownInterval)
{
super(millisInFuture, countDownInterval);
}
@Override
public void onFinish()
{
}
@Override
public void onTick(long arg0)
{
long millis = arg0;
long hour = TimeUnit.MILLISECONDS.toHours(millis);
long min = TimeUnit.MILLISECONDS.toMinutes(millis) - TimeUnit.HOURS.toMinutes(TimeUnit.MILLISECONDS.toHours(millis));
long sec = TimeUnit.MILLISECONDS.toSeconds(millis) - TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(millis));
long hr = 0;
if(hour>=24)
{
hr = hour - 24*7;
}
else
{
hr = hour;
}
}
} }
这是我上面的代码，我在 getStringExtra 部分得到 NullPointerException 。我想创建两个不同的计时器，当我关闭应用程序时，但仍然应该在服务中运行两个计时器，当我再次打开应用程序时，我应该从两个时钟看到更新的计时器值。
请帮帮我!!!请建议我一些可能的解决方案。