使用Android服务发送电子邮件

Question

我想在特定日期发送电子邮件。 我正在开发的服务将在特定日期发送电子邮件。 我花了数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，即使我的键盘已锁定。 有人可以帮我怎么做吗？

这是日志猫信息

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();
                          }
         }
}

Answer 1

我认为您应该使用警报管理器。

警报管理器适用于您希望在特定时间运行应用程序代码的情况，即使您的应用程序当前未运行。