SQLite Database возвращает Null

Question

Я работаю над приложением, которое должно раздуваться, и AutoCompleteTextView с запросами из базы данных. Проблема в том, что когда я вызываю метод для раздувания TextView, я не могу получить доступ к базе данных.

TextChanged Слушатель (Взято из CustomAutocompleteTextChangedListener.java):

@Override 
public void onTextChanged(CharSequence userInput, int start, int before, int count) { 

    //Log user input 
    Log.d(TAG,"User input : " + userInput); 

    Vindsiden vindsiden = new Vindsiden(); 

    //Query the database based on the user input 
    vindsiden.item = vindsiden.getItemsFromDb(userInput.toString()); 


    //Update the adapter 
    vindsiden.myAdapter.notifyDataSetChanged(); 
    vindsiden.myAdapter = new ArrayAdapter<String>(vindsiden, android.R.layout.simple_dropdown_item_1line,vindsiden.item); 
    vindsiden.AcTv_sok.setAdapter(vindsiden.myAdapter); 


} 

Который затем вызывает метод getItemsFromDb

public List<Sted> read(String searchTerm) { 
    List<Sted> recordList = new ArrayList<Sted>(); 
    //Select query 
    String sql = ""; 
    sql += "SELECT * FROM" + TABLE_PLACES; 
    sql += " WHERE " + COLUMN_NAME + " LIKE '%" + searchTerm + "%'"; 
    sql += " ORDER BY " + COLUMN_ID + " DESC"; 
    sql += " LIMIT 0,5"; 


    //The line under is what is returning null 
    SQLiteDatabase database = this.getWritableDatabase(); 


    //execute the query 
    Cursor cursor = database.rawQuery(sql, null); 

    //Looping rows and adding to the list 

    if (cursor.moveToFirst()) { 

     do { 
      String objectName = cursor.getString(cursor.getColumnIndex(COLUMN_NAME)); 
      Sted sted = new Sted(); 

      recordList.add(sted); 
     } while (cursor.moveToNext()); 
    } 
    cursor.close(); 
    database.close(); 
    return recordList; 

} 

У меня есть несколько вещей, которые обращаются к базе данных и другие методы работы, как, например, в ниже:

public Sted findPlace(String placeName) { 

    String query = "Select * FROM " + TABLE_PLACES + " WHERE " + COLUMN_NAME + " = \"" + placeName + "\""; 
    SQLiteDatabase database = this.getWritableDatabase(); 
    Cursor cursor = database.rawQuery(query, null); 
    Sted sted = new Sted(); 

    if (cursor.moveToFirst()) { 
     cursor.moveToFirst(); 
     sted.set_id(Integer.parseInt(cursor.getString(0))); 
     sted.set_stedsNavn(cursor.getString(1)); 
     sted.set_url(cursor.getString(2)); 
     cursor.close(); 

    } else { 
     sted = null; 

    } 
    database.close(); 
    return sted; 


} 

Ста cktrace:

02-01 10:50:08.201 14164-14164/com.vindsiden.windwidget E/AndroidRuntime﹕ FATAL EXCEPTION: main 
Process: com.vindsiden.windwidget, PID: 14164 
java.lang.NullPointerException 
     at android.content.ContextWrapper.openOrCreateDatabase(ContextWrapper.java:256) 
     at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:224) 
     at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:164) 
     at com.vindsiden.windwidget.config.DatabaseHandler.read(DatabaseHandler.java:143) 
     at com.vindsiden.windwidget.Vindsiden.getItemsFromDb(Vindsiden.java:483) 
     at com.vindsiden.windwidget.config.CustomAutocompleteTextChangedListener.onTextChanged(CustomAutocompleteTextChangedListener.java:38) 
     at android.widget.TextView.sendOnTextChanged(TextView.java:7408) 
     at android.widget.TextView.handleTextChanged(TextView.java:7467) 
     at android.widget.TextView$ChangeWatcher.onTextChanged(TextView.java:9183) 
     at android.text.SpannableStringBuilder.sendTextChanged(SpannableStringBuilder.java:962) 
     at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:496) 
     at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:435) 
     at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:30) 
     at android.view.inputmethod.BaseInputConnection.replaceText(BaseInputConnection.java:675) 
     at android.view.inputmethod.BaseInputConnection.setComposingText(BaseInputConnection.java:437) 
     at com.android.internal.view.IInputConnectionWrapper.executeMessage(IInputConnectionWrapper.java:333) 
     at com.android.internal.view.IInputConnectionWrapper$MyHandler.handleMessage(IInputConnectionWrapper.java:77) 
     at android.os.Handler.dispatchMessage(Handler.java:102) 
     at android.os.Looper.loop(Looper.java:136) 
     at android.app.ActivityThread.main(ActivityThread.java:5017) 
     at java.lang.reflect.Method.invokeNative(Native Method) 
     at java.lang.reflect.Method.invoke(Method.java:515) 
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779) 
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595) 
     at dalvik.system.NativeStart.main(Native Method) 

Полный код avalible как: https://github.com/danielgolan/Vindsiden/tree/Daniel2

Answer 1

Context вы переданы SQLiteOpenHelper родительский конструктор был null.