無法顯示進度對話框

Question

我在準備一個應用程序。最初我必須將大量數據放入數據庫中。要做到這一點，我已經如下使用AsyncTask：

這是我的Java代碼：

package com.hippieapp; 

import java.text.SimpleDateFormat; 
import java.util.Calendar; 
import java.util.Locale; 

import android.app.Activity; 
import android.app.ProgressDialog; 
import android.content.ContentValues; 
import android.content.SharedPreferences; 
import android.database.sqlite.SQLiteDatabase; 
import android.os.AsyncTask; 
import android.os.Bundle; 
import android.preference.PreferenceManager; 

public class Home extends Activity { 

    static SQLiteDatabase database; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_home); 

     SharedPreferences prefs = PreferenceManager 
       .getDefaultSharedPreferences(this); 
     if (!prefs.getBoolean("firstTime", false)) { 

      new CheckTypesTask().execute(); 

      SharedPreferences.Editor editor = prefs.edit(); 
      editor.putBoolean("firstTime", true); 
      editor.commit(); 
     } 
    } 

    private void insert_in_questions() { 
     // TODO Auto-generated method stub 

     loadDatabase(); 

     String currentDate = new SimpleDateFormat("yyyy/MM/dd").format(Calendar 
       .getInstance().getTime()); 
     ContentValues values = new ContentValues(); 

     values.put("question", 
       "How many inch your hair long reaches past your shoulders ?"); 
     values.put("ans_type", "textinput"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", "Are you male ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", 
       "For males- Have you gotten flack for having long hair ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", 
       "For Females- Have you gotten flack for wearing no makeup ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", 
       "Are you over the age of 40 and still have not cut your hair ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put(
       "question", 
       "Do you have a brownie recipe that includes ingredients you can not get at the local A&P ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put(
       "question", 
       "Is your dwelling is decorated with beads hanging from the door, a lava lamp or fillmore posters ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", 
       "Do you have a bean bag chair in your \"groovy pad\" ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", 
       "Does the bean bag chair is the only piece of furniture you have ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", "Is your home decorated with homemade art ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", "Do you do pottery ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", "Do you know how to do macrame ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", "Do you know how to do the macaroon ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", "Did you were at Woodstock ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", 
       "Do you think you may have been at Woodstock, but aren't entirely sure ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", "Who is your favorite Beatle ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put(
       "question", 
       "Do you have fire drills to practice getting all your Grateful Dead tapes out of the house ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put(
       "question", 
       "How many state line you've crossed on your longest road trip to see a 60s era musical artist or band in concert ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", 
       "Have you have traveled to another country to see such a band or artist ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", 
       "Were you were affected personally by Jerry Garcia's death ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", "Do you know what bag you're in ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", "Do you own an incense burner ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", "Do you own, or have owned a VW bus ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", "Is the bus painted multiple colors ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", "Do you play the sitar ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put(
       "question", 
       "Have you written a song protesting war, bucking the establishment, or containing a reference to illegal drugs ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put(
       "question", 
       "Have you written songs about all three protesting war, bucking the establishment, or containing a reference to illegal drugs ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", "Were you actually alive in the 1960s ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", 
       "Do you really, really wish you had been alive in the 1960s ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", "Do you believe that \"All You Need is Love\" ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", "Do you believe in good medical plan ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", 
       "Does the word \"trip\" not make you think of a vacation ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", 
       "Does the word \"man\" peppers your conversations ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put(
       "question", 
       "Have you used the word \"groovy\" or the phrase \"Can you dig it ?\" with a straight face?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put(
       "question", 
       "Have you used words \"groovy\" and the phrase \"Can you dig it ?\" both in the same sentence ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", "Have you taken part in a peace march ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", "Have you started a petition ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", "Have you taken part in a sit-in ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put(
       "question", 
       "Have you \"taken part in a peace march\", \"started a petition\" and \"taken part in a sit-in\" all three ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", 
       "Have you ever received junk mail addressed to \"dear radical\" ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", 
       "Do you think \"social action\" is a frat party on a saturday night ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put(
       "question", 
       "Have your children names like Windsong, Freedom or Peace Love Understanding Smith ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", 
       "Do you wish your parents had named you Peace Love Understanding Smith ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", 
       "Do you say \"thank you\" when someone calls you a hippy ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put(
       "question", 
       "Do you say \"Groovy man, like, you think I'm a hippy? Far out, can you dig that?\""); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", "Do you wear Birkenstocks ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", "Do you make your own sandals ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put(
       "question", 
       "Do you have a bumper sticker reading \"save the whales\", \"think green\" or has dancing bears on it ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put(
       "question", 
       "Does bumper stickers like \"save the whales\", \"think green\" or has dancing bears on it; are holding your car together ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", "Are you a vegetarian ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put(
       "question", 
       "Does the only reason you call yourself a \"vegetarian\" is that you stopped eating Big Macs ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", "Do you smell like patchouli ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", 
       "Have you have sold any hand-made item in the parking lot of a concert ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", "Do you think money is the root of all evil ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", 
       "Do you add the phrase \"and may the devil smite me with it\" ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", 
       "Do you think Jim Morrison's poetry is profound ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", "Do you think John Lennon's drawings are art ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", "Do you like Bob Dylan's singing voice ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", 
       "Have you ever heard of Jim Morrison, John Lennon or Bob Dylan?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put(
       "question", 
       "Do you have a necklace with either wooden beads, seeds, a peace or yin yang symbol ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put(
       "question", 
       "Do you have \"wooden beads\", \"seeds\" and \"a peace or yin yang symbol\" all together ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put(
       "question", 
       "Did you use to have \"wooden beads\", \"seeds\" and \"a peace or yin yang symbol\" all of the three but you gave them away or traded them for concert tickets"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put(
       "question", 
       "Does your computer screen name or password is related to a 60s musical performer ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put(
       "question", 
       "Are the only CDs or records in your collection that were recorded after 1980 were recorded by artists who were most famous in the 60s or 70s ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", "Have you been to San Francisco ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", "Have you wore flowers in your hair ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", "Have you lived in a commune ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put(
       "question", 
       "Have you quit the commune because you were tired of being the one to do all the work ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", "Do you own a tie dyed article of clothing ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", "Did you dye article of clothing yourself ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", "Do you own any clothing items made of hemp ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put(
       "question", 
       "Have you practiced Transcendental Meditation, have seriously studied Eastern religion, or been a Jesus freak ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put(
       "question", 
       "Have you done \"practiced Transcendental Meditation\", \"have seriously studied Eastern religion\", and \"been a Jesus freak\" all of the these ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 

     values.put("question", 
       "Have you had a chemically induced spiritual experience ?"); 
     values.put("ans_type", "yesno"); 
     values.put("creation_date", currentDate); 
     values.put("is_delete", "0"); 
     values.put("is_publish", "1"); 
     database.insert("questions", null, values); 
     values.clear(); 
     . 
     . 
     . 

    } 

    private void create_database_and_tables() { 
     // TODO Auto-generated method stub 

     database = openOrCreateDatabase("HippieDatabase.db", 
       SQLiteDatabase.CREATE_IF_NECESSARY, null); 
     database.setLocale(Locale.getDefault()); 
     database.setVersion(1); 

     String create_table_questions = "create table if not exists questions (q_id INTEGER PRIMARY KEY AUTOINCREMENT, " 
       + "question TEXT, " 
       + "ans_type TEXT, " 
       + "creation_date TEXT, " 
       + "is_delete INTEGER, " 
       + "is_publish INTEGER);"; 
     database.execSQL(create_table_questions); 

     String create_table_answer_option = "create table if not exists answer_option (ao_id INTEGER PRIMARY KEY AUTOINCREMENT, " 
       + "q_id INTEGER, " 
       + "ans_option TEXT, " 
       + "ans_point INTEGER, " 
       + "is_delete INTEGER, " 
       + "is_publish INTEGER);"; 
     database.execSQL(create_table_answer_option); 
    } 

    private void loadDatabase() { 

     database = openOrCreateDatabase("HippieDatabase.db", 
       SQLiteDatabase.OPEN_READWRITE, null); 
    } 

    class CheckTypesTask extends AsyncTask<Void, Void, Void> { 

     ProgressDialog Asycdialog = new ProgressDialog(Home.this); 
     String typeStatus; 

     @Override 
     protected void onPreExecute() { 

      Asycdialog.setMessage("First time initialization. Please wait..."); 
      Asycdialog.show(); 
      super.onPreExecute(); 
     } 

     @Override 
     protected Void doInBackground(Void... arg0) { 

      create_database_and_tables(); 

      insert_in_questions(); 

//   insert_in_answer_option(); 

      return null; 
     } 

     @Override 
     protected void onPostExecute(Void result) { 

      database.close(); 
      Asycdialog.dismiss(); 

      super.onPostExecute(result); 
     } 
    } 

// public void insert_in_answer_option() { 
//  // TODO Auto-generated method stub 
//  
//  
// } 
} 

正如你看到的，我已經做了在數據庫76項，但我仍無法查看ProgressDialog。第一次運行的應用程序中仍然會插入更多的數據。

有誰能告訴我爲什麼？代碼有沒有錯，或者數據不夠大，無法顯示ProgressDialog？請幫幫我。這是我第一次使用AsyncTask完成工作。

Answer 1

super.onPreExecute()必須在您的第一個指令上onPreExecute方法