CODEWITHSUNDEEP
android
darlik
darlik

Reputation: 255

Add custom values to array

I have example android app:

void fillAutoCompleteFromDatabase()
{
    mCursor = mDB.query(
            PetType.PETTYPE_TABLE_NAME,
            new String[] {PetType.PET_TYPE_NAME, 
             PetType._ID}, null, null,
             null, null,
            PetType.DEFAULT_SORT_ORDER);

    startManagingCursor(mCursor);


    int iNumberOfSpeciesTypes = mCursor.getCount();
    String astrAutoTextOptions[] = new String[iNumberOfSpeciesTypes];
    if((iNumberOfSpeciesTypes > 0) && (mCursor.moveToFirst()))
    {
        for(int i = 0; i < iNumberOfSpeciesTypes; i++)
        {
            astrAutoTextOptions[i] = 
                mCursor.getString(mCursor.
                           getColumnIndex(PetType.PET_TYPE_NAME));
            mCursor.moveToNext();
        }

        ArrayAdapter<String> adapter =
            new ArrayAdapter<String>(
                this,
                android.R.layout.simple_dropdown_item_1line,
                astrAutoTextOptions);

        AutoCompleteTextView text = 
            (AutoCompleteTextView) 
                findViewById(R.id.EditTextSpecies);
        text.setAdapter(adapter);
    }

}

I'm still learning Android and i have question - why i can add custom values from this array? I try:

void fillAutoCompleteFromDatabase()
{
    mCursor = mDB.query(
            PetType.PETTYPE_TABLE_NAME,
            new String[] {PetType.PET_TYPE_NAME, 
             PetType._ID}, null, null,
             null, null,
            PetType.DEFAULT_SORT_ORDER);

    startManagingCursor(mCursor);


    int iNumberOfSpeciesTypes = mCursor.getCount();
    String astrAutoTextOptions[] = new String[iNumberOfSpeciesTypes + 3];
    if((iNumberOfSpeciesTypes > 0) && (mCursor.moveToFirst()))
    {
        for(int i = 0; i < iNumberOfSpeciesTypes; i++)
        {
            astrAutoTextOptions[i] = 
                mCursor.getString(mCursor.
                           getColumnIndex(PetType.PET_TYPE_NAME));
            mCursor.moveToNext();
        }

        astrAutoTextOptions[iNumberOfSpeciesTypes + 1] = "aaaaaa"; 
        astrAutoTextOptions[iNumberOfSpeciesTypes + 2] = "bbbb";
        astrAutoTextOptions[iNumberOfSpeciesTypes + 3] = "cccccc";

        ArrayAdapter<String> adapter =
            new ArrayAdapter<String>(
                this,
                android.R.layout.simple_dropdown_item_1line,
                astrAutoTextOptions);

        AutoCompleteTextView text = 
            (AutoCompleteTextView) 
                findViewById(R.id.EditTextSpecies);
        text.setAdapter(adapter);
    }

}

I dont have error in Eclipse, but if i open this app on my mobile phone then she crashed.

Upvotes: 0

Views: 35

Answers (1)

Simas
Simas

Reputation: 44188

Change 

    astrAutoTextOptions[iNumberOfSpeciesTypes + 1] = "aaaaaa"; 
    astrAutoTextOptions[iNumberOfSpeciesTypes + 2] = "bbbb";
    astrAutoTextOptions[iNumberOfSpeciesTypes + 3] = "cccccc";

to 

    astrAutoTextOptions[iNumberOfSpeciesTypes] = "aaaaaa"; 
    astrAutoTextOptions[iNumberOfSpeciesTypes + 1] = "bbbb";
    astrAutoTextOptions[iNumberOfSpeciesTypes + 2] = "cccccc";

The for loop stops at the index for which the cursor doesn't have a value, that's the index you need to start writing to. However you are skipping that value and writing to the next 3, while only 2 are left available then.

I would advise you to change your whole code to this:

void fillAutoCompleteFromDatabase() {
    mCursor = mDB.query(
            PetType.PETTYPE_TABLE_NAME,
            new String[] {PetType.PET_TYPE_NAME,
                    PetType._ID}, null, null,
            null, null,
            PetType.DEFAULT_SORT_ORDER);

    startManagingCursor(mCursor);

    if(mCursor.moveToFirst()) {
        List<String> astrAutoTextOptions = new ArrayList<String>();
        for(int i = 0; i < mCursor.getCount(); i++) {
            astrAutoTextOptions.add(mCursor.getString(mCursor.
                    getColumnIndex(PetType.PET_TYPE_NAME)));
            mCursor.moveToNext();
        }

        astrAutoTextOptions.add("aaaaaa");
        astrAutoTextOptions.add("bbbb");
        astrAutoTextOptions.add("cccccc");

        ArrayAdapter<String> adapter =
                new ArrayAdapter<String>(
                        this,
                        android.R.layout.simple_dropdown_item_1line,
                        astrAutoTextOptions);

        AutoCompleteTextView text = (AutoCompleteTextView) findViewById(R.id.EditTextSpecies);
        text.setAdapter(adapter);
    }
}

Lists are more portable in my opinion. Plus you were making some checks for your cursor.

One more thing. startManagingCursor is deprecated as far as i know. You shouldn't be using it. Instead use a CursorLoader.

Upvotes: 1

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