Java 使用Android服务发送电子邮件

我想在特定日期发送电子邮件。我正在开发一项服务，将在特定日期发送电子邮件。我花了几个小时试图弄清楚如何在服务后台的特定日期发送电子邮件，即使我的键盘是锁着的。有人能帮我怎么做吗

这里是日志猫信息

08-16 15:18:00.122: E/AndroidRuntime(632): java.lang.RuntimeException: Unable to start service com.demo.EmailService@40561c20 with Intent { cmp=com.demo/.EmailService }: android.util.AndroidRuntimeException: Calling startActivity() from outside of an Activity  context requires the FLAG_ACTIVITY_NEW_TASK flag. Is this really what you want?
08-16 15:18:00.122: E/AndroidRuntime(632):  at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2052)
08-16 15:18:00.122: E/AndroidRuntime(632):  at android.app.ActivityThread.access$2800(ActivityThread.java:117)
08-16 15:18:00.122: E/AndroidRuntime(632):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:994)
08-16 15:18:00.122: E/AndroidRuntime(632):  at android.os.Handler.dispatchMessage(Handler.java:99)
08-16 15:18:00.122: E/AndroidRuntime(632):  at android.os.Looper.loop(Looper.java:123)
08-16 15:18:00.122: E/AndroidRuntime(632):  at android.app.ActivityThread.main(ActivityThread.java:3683)
08-16 15:18:00.122: E/AndroidRuntime(632):  at java.lang.reflect.Method.invokeNative(Native Method)
08-16 15:18:00.122: E/AndroidRuntime(632):  at java.lang.reflect.Method.invoke(Method.java:507)
08-16 15:18:00.122: E/AndroidRuntime(632):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
08-16 15:18:00.122: E/AndroidRuntime(632):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
08-16 15:18:00.122: E/AndroidRuntime(632):  at dalvik.system.NativeStart.main(Native Method)
08-16 15:18:00.122: E/AndroidRuntime(632): Caused by: android.util.AndroidRuntimeException: Calling startActivity() from outside of an Activity  context requires the FLAG_ACTIVITY_NEW_TASK flag. Is this really what you want?
08-16 15:18:00.122: E/AndroidRuntime(632):  at android.app.ContextImpl.startActivity(ContextImpl.java:621)
08-16 15:18:00.122: E/AndroidRuntime(632):  at android.content.ContextWrapper.startActivity(ContextWrapper.java:258)
08-16 15:18:00.122: E/AndroidRuntime(632):  at com.demo.EmailService.sendEmail(EmailService.java:86)
08-16 15:18:00.122: E/AndroidRuntime(632):  at com.demo.EmailService.onStartCommand(EmailService.java:44)
08-16 15:18:00.122: E/AndroidRuntime(632):  at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2039)

这是我的服务代码

public class EmailService extends Service 
{
    private static final String TAG = null;
    private static final String TAG1="MyService";
    private static final String LOGTAG = null;


    String strServiceName ;
    String strSuppliername ;
    String strEmail; 
    String strReplacementDate ; 
    String strIntervalDays; 
    String strNextReplacementDate;

    String strMyServicePref;

    @Override
    public IBinder onBind(Intent arg0) {
        // TODO Auto-generated method stub
        return null;
    }

    public void onCreate()
    {
         Toast.makeText(this,"My Service Created",Toast.LENGTH_LONG).show();
         Log.d(TAG,"ON CREATE");
         super.onCreate();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId)
    {
        startService(intent);
        sendEmail();
        return Service.START_STICKY;
    }


    protected void sendEmail()
    {
         SharedPreferences sharedPref1 =getSharedPreferences("MyPref_CellNumber", 0);
         SharedPreferences.Editor editor1 = sharedPref1.edit();

         strServiceName=sharedPref1.getString("ServiceName" , "a\n");
         strSuppliername=sharedPref1.getString("Suppliername" , "a\n");
         strEmail=sharedPref1.getString("Email" , "a\n");
         strReplacementDate=sharedPref1.getString("ReplacementDate" , "a\n");
         strIntervalDays=sharedPref1.getString("IntervalDays" , "a\n");
         strNextReplacementDate=sharedPref1.getString("NextReplacementDate" , "a\n");

         Log.e(TAG,"ON CREATE" + strServiceName);
         Log.e(TAG,"ON CREATE" + strSuppliername);
         Log.e(TAG,"ON CREATE" + strEmail);
         Log.e(TAG,"ON CREATE" + strReplacementDate);
         Log.e(TAG,"ON CREATE" + strIntervalDays);
         Log.e(TAG,"ON CREATE" + strNextReplacementDate);

                            String subject = strServiceName;

                            String body = strServiceName+","
                                          +strSuppliername+","
                                          +strReplacementDate+","
                                          +strIntervalDays+","
                                          +strNextReplacementDate;

                           Log.e("body " , " = " + body);

                          Intent i = new Intent(Intent.ACTION_SEND);
                          i.setType("message/rfc822");
                          i.putExtra(Intent.EXTRA_EMAIL  , new String[]{strEmail});
                          i.putExtra(Intent.EXTRA_SUBJECT, subject);
                          i.putExtra(Intent.EXTRA_TEXT   , body);

                          try 
                          {
                              startActivity(Intent.createChooser(i, "Send mail...in Service Background"));
                          } 
                          catch (android.content.ActivityNotFoundException ex) 
                          {
                              Toast.makeText(EmailService.this, "There are no email clients installed.", Toast.LENGTH_SHORT).show();
                          }
         }
}

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我认为你应该使用报警管理器

报警管理器适用于您希望 应用程序代码在特定时间运行，即使您的应用程序 当前未运行