com.jpventura.alexandria.ListOfBooks.java Source code

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Here is the source code for com.jpventura.alexandria.ListOfBooks.java

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/*
 * Copyright 2015 Udacity, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.jpventura.alexandria;

import android.app.Activity;
import android.database.Cursor;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.LoaderManager.LoaderCallbacks;
import android.support.v4.content.CursorLoader;
import android.support.v4.content.Loader;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.EditText;
import android.widget.ListView;

import com.jpventura.alexandria.api.BookListAdapter;
import com.jpventura.alexandria.api.Callback;
import com.jpventura.alexandria.data.AlexandriaContract;

public class ListOfBooks extends Fragment implements LoaderCallbacks<Cursor>, OnClickListener, OnItemClickListener {

    private BookListAdapter bookListAdapter;
    private ListView bookList;
    private int position = ListView.INVALID_POSITION;
    private EditText searchText;

    private final int LOADER_ID = 10;

    public ListOfBooks() {
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        Cursor cursor = getActivity().getContentResolver().query(AlexandriaContract.BookEntry.CONTENT_URI, null, // leaving "columns" null just returns all the columns.
                null, // cols for "where" clause
                null, // values for "where" clause
                null // sort order
        );

        bookListAdapter = new BookListAdapter(getActivity(), cursor, 0);
        View rootView = inflater.inflate(R.layout.fragment_list_of_books, container, false);
        searchText = (EditText) rootView.findViewById(R.id.searchText);
        rootView.findViewById(R.id.searchButton).setOnClickListener(this);

        bookList = (ListView) rootView.findViewById(R.id.listOfBooks);
        bookList.setAdapter(bookListAdapter);
        bookList.setOnItemClickListener(this);

        return rootView;
    }

    @Override
    public void onClick(View view) {
        switch (view.getId()) {
        case R.id.searchButton:
            ListOfBooks.this.restartLoader();
            break;
        }
    }

    @Override
    public void onItemClick(AdapterView<?> adapterView, View view, int position, long l) {
        Cursor cursor = bookListAdapter.getCursor();

        if ((null == cursor) || !cursor.moveToPosition(position))
            return;

        String ean = cursor.getString(cursor.getColumnIndex(AlexandriaContract.BookEntry._ID));
        ((Callback) getActivity()).onItemSelected(ean);
    }

    private void restartLoader() {
        getLoaderManager().restartLoader(LOADER_ID, null, this);
    }

    @Override
    public Loader<Cursor> onCreateLoader(int id, Bundle args) {

        final String selection = AlexandriaContract.BookEntry.TITLE + " LIKE ? OR "
                + AlexandriaContract.BookEntry.SUBTITLE + " LIKE ? ";
        String searchString = searchText.getText().toString();

        if (searchString.length() > 0) {
            searchString = "%" + searchString + "%";
            return new CursorLoader(getActivity(), AlexandriaContract.BookEntry.CONTENT_URI, null, selection,
                    new String[] { searchString, searchString }, null);
        }

        return new CursorLoader(getActivity(), AlexandriaContract.BookEntry.CONTENT_URI, null, null, null, null);
    }

    @Override
    public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
        bookListAdapter.swapCursor(data);
        if (position != ListView.INVALID_POSITION) {
            bookList.smoothScrollToPosition(position);
        }
    }

    @Override
    public void onLoaderReset(Loader<Cursor> loader) {
        bookListAdapter.swapCursor(null);
    }

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);
        activity.setTitle(R.string.books);
    }
}