Android:在通知中调用异步任务时发生异常

我试图在用户选择的特定时间发出通知。此通知调用另一个类中的AsyncTask。每次使用以下代码调用AsyncTask时，我都会遇到一个异常：

new ExtendedActivity().new Parse().getHoroscope("daily", signo); 

我已经把

Log.d

放在了GetOroscope上，但我得到的例外是在它之前

例外情况：

java.lang.RuntimeException: Unable to start receiver com.converter.android.dailyhoroscope.MyReceiver: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.pm.ApplicationInfo android.content.Context.getApplicationInfo()' on a null object reference                                                                                      at android.app.ActivityThread.handleReceiver(ActivityThread.java:2732)                                                                                       at android.app.ActivityThread.-wrap14(ActivityThread.java)                                                                                      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1421)                                                                                       at android.os.Handler.dispatchMessage(Handler.java:102)                                                                                     at android.os.Looper.loop(Looper.java:148)                                                                                       at android.app.ActivityThread.main(ActivityThread.java:5417)                                                                                      at java.lang.reflect.Method.invoke(Native Method)                                                                                   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)                                                                                       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
                                                                                         Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.pm.ApplicationInfo android.content.Context.getApplicationInfo()' on a null object reference
                                                                                            at android.content.ContextWrapper.getApplicationInfo(ContextWrapper.java:150)                                                                                       at android.view.ContextThemeWrapper.getTheme(ContextThemeWrapper.java:110)                                                                                        at android.app.AlertDialog.resolveDialogTheme(AlertDialog.java:222)                                                                                        at android.app.AlertDialog.<init>(AlertDialog.java:200)                                                                                       at android.app.AlertDialog.<init>(AlertDialog.java:196)                                                                                        at android.app.AlertDialog.<init>(AlertDialog.java:141)                                                                                        at android.app.ProgressDialog.<init>(ProgressDialog.java:77)                                                                                       at com.converter.android.dailyhoroscope.ExtendedActivity$Parse.<init>(ExtendedActivity.java:73)                                                                                       at com.converter.android.dailyhoroscope.MyReceiver.createNotification(MyReceiver.java:89)                                                                                        at com.converter.android.dailyhoroscope.MyReceiver.onReceive(MyReceiver.java:60)                                                                                       at android.app.ActivityThread.handleReceiver(ActivityThread.java:2725)                                                                                        at android.app.ActivityThread.-wrap14(ActivityThread.java)                                                                                         at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1421)                                                                                         at android.os.Handler.dispatchMessage(Handler.java:102)                                                                                        at android.os.Looper.loop(Looper.java:148)                                                                                        at android.app.ActivityThread.main(ActivityThread.java:5417)                                                                                         at java.lang.reflect.Method.invoke(Native Method)                                                                                         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)                                                                                        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

MyReceiver.java

@Override
public void onReceive(Context context, Intent intent)
{
 (...)
    SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(context);
    signo  = pref.getString(dHosocope,"");
    createNotification(context, signo);
}

public void createNotification(Context context, String signo){
(...)
   sentence = new ExtendedActivity().new Parse().getHoroscope("daily", signo);
}

类扩展

public class ExtendedActivity extends BaseActivity {

//AsyncThread
    public class Parse extends AsyncTask<String, Void, String> {
      public String getHoroscope(String type, String option){
        String description="", site;
        Log.d("Extended","inside getHoroscopes");
        (...)
}

public类ExtendedActivity扩展BaseActivity{
//异步线程
公共类解析扩展异步任务{
公共字符串GetOroscope（字符串类型，字符串选项）{
字符串description=“”，站点；
Log.d（“扩展”、“星座图内部”）；
(...)
}

---

有人能帮我吗？

您不能调用new Activity（）。创建活动的唯一方法是通过startActivity（）。任何其他尝试都会立即或稍后导致错误。如果需要在活动外部使用该AsyncTask，请将其设为顶级类，而不是内部类

public class ExtendedActivity extends BaseActivity {

//AsyncThread
    public class Parse extends AsyncTask<String, Void, String> {
      public String getHoroscope(String type, String option){
        String description="", site;
        Log.d("Extended","inside getHoroscopes");
        (...)
}