Immer NullPointerExceptions, wenn Sie versuchen, um call getWritableDatabase()

Ich bin neu in der Android-framework, und ich kann nicht vorbei an der ersten base mit SQLite.

Ich versuche zu bauen eine sehr einfache Anwendung, die hat ein EditText Feld Suche, die, wenn eine Taste gedrückt wird, führt eine Wie %Wort% Suche auf eine SQLite-Datenbank für die Eingabe von text in die EditText-box, und zeigt die Ergebnisse in einer ListView.

N. B. den folgenden code enthalten debugging und kommentierten code, sorry, ich habe nicht rund um die Reinigung noch.

Aktivieren ist

public class sustainable_fish extends Activity {

private String keycodeToAscii(int arg2){

    String retvar = "";

    switch(arg2){
    case KeyEvent.KEYCODE_A: retvar = "a";break;
    case KeyEvent.KEYCODE_B: retvar = "b";break;

geschnippelt, aber Sie bekommen die Idee.

    case KeyEvent.KEYCODE_RIGHT_BRACKET: retvar = ")";break;
    default: retvar = ""; break;
    };
    return retvar;

}



 Context that = getApplicationContext();
 fishDB dh = new fishDB(getApplicationContext());


private OnKeyListener search = new OnKeyListener() {

    public boolean onKey(View arg0, int arg1, KeyEvent arg2) {


        @SuppressWarnings("unused")
        Cursor cur = null;
        String searchData;
        EditText myEditText = (EditText) findViewById(R.id.fish_search);
        CharSequence edit_text_value = myEditText.getText();
        searchData = edit_text_value.toString();
        searchData = searchData + keycodeToAscii(arg2.getKeyCode() );
        Log.d("onKey", "searchData = "+searchData);
        /*
        Commented out because as the database doesn't work, so theirs no point just yet searching.

        cur = fish.search(searchData);
        if (cur != null)
        {
            String[] displayFields = new String[] {cur.getString(2),
                    cur.getString(1)};

            int[] displayViews = new int[] { R.id.fish_rank,
                    R.id.fish_name};

            SimpleCursorAdapter adapter = new SimpleCursorAdapter(that, 
                    R.layout.text_list, cur, 
                    displayFields, displayViews);

            ListView myList=(ListView)findViewById(android.R.id.list);

            myList.setAdapter(adapter);
        } 
        */

        return false;
    }

};

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

   setContentView(R.layout.main);
   EditText searchBar = (EditText) findViewById(R.id.fish_search);
   searchBar.setOnKeyListener(search); 

}

}

Die SQLite-Datenbank erfolgt durch fishDB

  public class fishDB {

 public static final String DATABASE_NAME = "fish.db3";
 public static final int DATABASE_VERSION = 1;
 private SQLiteDatabase database;
 private Context myContext;
 private static boolean booFirstrun = false;

 fishDB(Context inContext){
     myContext = inContext;
     OpenHelper helper = new OpenHelper(myContext);
     Log.w("fishDB", "Called OpenHelper");

             // Here be the problem...

     database = helper.getWritableDatabase();

 }

 public boolean firstRun(){
    return booFirstrun;
 }


   private static class OpenHelper extends SQLiteOpenHelper {

       private static final String CREATE_TABLE_FEEDS = "create table feeds (feed_id integer primary key autoincrement, "
           + "title text not null, url text not null);";

          OpenHelper(Context context) {
             super(context, DATABASE_NAME, null, DATABASE_VERSION);
             Log.w("OpenHelper", "Called superconstructor");
            }

          @Override
          public void onCreate(SQLiteDatabase db) {
              try {
              Log.w("OpenHelper", "in onCreate");
              booFirstrun = true;
              Log.w("OpenHelper", "set booFirstrun");
              db.beginTransaction();
              Log.w("OpenHelper", "db.beginTransaction");
              try {
                  // Create tables and test data
                  db.execSQL(CREATE_TABLE_FEEDS);
                  Log.w("OpenHelper", "execSQL");
                  db.setTransactionSuccessful();
                  Log.w("OpenHelper", "setTransactionSuccessful");
              } catch (SQLException e) {
                  Log.e("Error creating tables and debug data", e.toString());
                  throw e;
              } finally {
                  db.endTransaction();
              }
              } catch (Exception e) {
                  Log.e("OpenHelper", e.toString() );
              } finally {
              Log.w("OpenHelper", "out of onCreate");
              }
          }

          @Override
          public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
             Log.w("OpenHelper", "Upgrading database, this will drop tables and recreate.");
             onCreate(db);
          }
       } 
 }

Nun jedes mal "Datenbank = helper.getWritableDatabase();" aufgerufen wird, stürzt die app mit einer NullPointerException. Ich habe es geschafft auf die Spur, die Fehler in der onCreate-Methode der OpenHelper und die "db.beginTransaction();" Zeile.

Was bin ich?