Text Watcher JSONObject in ListView

Question

I tried to make AutoComplete Search for my app, but my code filtered titles of books and showed wrong items in my ListView. It doesn't make senses. For example, when I typed 'M' in EditText, it showed others list these aren't start alphabet with 'M' or without 'M' in title names of books. Help me please?

This is my adapter that I extended ArrayAdapter.

public class CustomList extends ArrayAdapter<String> {
    private String[] titles;
    private String[] authors;
    private String[] prices;
    private String[] pricebycovers;
    private String[] percentdiscounts;
    private String[] urls;
    private Bitmap[] bitmaps;
    private Activity context;


    public CustomList(Activity context, String[] titles, String[] authors, String[] prices, String[] pricebycovers, String[] percentdiscounts, String[] urls, Bitmap[] bitmaps) {
        //super(context, R.layout.list_view, urls);
        //super(context, R.layout.list_view, titles);
        super(context, R.layout.list_view, R.id.editTextTitle, titles);
        this.context = context;
        this.titles = titles;
        this.authors = authors;
        this.prices = prices;
        this.pricebycovers = pricebycovers;
        this.percentdiscounts = percentdiscounts;
        this.urls= urls;
        this.bitmaps= bitmaps;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        LayoutInflater inflater = context.getLayoutInflater();
        View listViewItem = inflater.inflate(R.layout.list_view, null, true);
        TextView tvTitle = (TextView) listViewItem.findViewById(R.id.tvTitle);
        TextView tvAuthor = (TextView) listViewItem.findViewById(R.id.tvAuthor);
        TextView tvPrice = (TextView) listViewItem.findViewById(R.id.tvPrice);
        TextView tvPriceByCover = (TextView) listViewItem.findViewById(R.id.tvPriceByCover);
        TextView tvPercentageDiscount = (TextView) listViewItem.findViewById(R.id.tvPercentageDiscount);
        ImageView imvBookPic = (ImageView) listViewItem.findViewById(R.id.imvBookPic);

        tvTitle.setText(titles[position]);
        tvAuthor.setText(authors[position]);
        tvPrice.setText(prices[position]);
        tvPriceByCover.setText(pricebycovers[position]);
        tvPercentageDiscount.setText(percentdiscounts[position]);

        imvBookPic.setImageBitmap(Bitmap.createScaledBitmap(bitmaps[position],80,80,false));
        return listViewItem;
    }

    public String[] getTitle(){
        return titles;
    }
}

And this is a part of MainActivity that I called TextWatcher

private ListView listView;
private CustomList customList;
private CustomList customList;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_profile);

    listView = (ListView) findViewById(R.id.listView);
    listView.setOnItemClickListener(this);

    /**
     * Enabling Search Filter
     * */
    inputSearch = (EditText) findViewById(R.id.inputSearch);

    inputSearch.addTextChangedListener(new TextWatcher() {

        @Override
        public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) {
            // When user changed the Text
            MainActivity.this.customList.getFilter().filter(cs);
            //Log.w("d",this.customList.getFilter().filter(cs));
        }

        @Override
        public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,
                                      int arg3) {
            // TODO Auto-generated method stub

        }

        @Override
        public void afterTextChanged(Editable arg0) {
            // TODO Auto-generated method stub

        }
    });
}

I called and setAdapter like this

customList = new CustomList(MainActivity.this, GetAlIBooks.titles, GetAlIBooks.authors, GetAlIBooks.prices, GetAlIBooks.pricebycovers, GetAlIBooks.percentdiscounts, GetAlIBooks.imageURLs, GetAlIBooks.bitmaps);
listView.setAdapter(customList);

This is my ListView Layout in XML

<?xml version="1.0" encoding="utf-8"?>
<GridLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">


    <ImageView
        android:id="@+id/imvBookPic"
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:layout_column="0"
        android:layout_marginRight="10dp"
        android:layout_row="0"
        android:layout_rowSpan="4"
        android:background="@drawable/book_default" />

    <TextView
        android:id="@+id/tvTitle"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_column="1"
        android:layout_columnSpan="2"
        android:layout_columnWeight="1"
        android:layout_row="0"
        android:text="Title"
        android:textStyle="bold" />


    <TextView
        android:id="@+id/tvAuthor"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_column="1"
        android:layout_columnSpan="2"
        android:layout_columnWeight="1"
        android:layout_row="1"
        android:layout_weight="1"
        android:text="Author"
        android:textSize="12sp" />

    <TextView
        android:id="@+id/tvPrice"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_column="1"
        android:layout_columnWeight="1"
        android:layout_marginRight="5dp"
        android:layout_row="2"
        android:text="Price"
        android:textColor="@color/red" />

    <TextView
        android:id="@+id/tvPriceByCover"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_column="2"
        android:layout_columnWeight="1"
        android:layout_row="2"
        android:text="Price by cover" />

    <TextView
        android:id="@+id/tvPercentageDiscount"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_column="1"
        android:layout_columnSpan="2"
        android:layout_columnWeight="1"
        android:layout_row="3"
        android:text="Percentage Discount"
        android:textColor="@color/green" />


</GridLayout>