Java tutorial
/* * Copyright 2015. Emin Yahyayev * * 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.ewintory.alexandria.ui.activity; import android.app.Activity; import android.content.Intent; import android.content.SharedPreferences; import android.database.Cursor; import android.os.Bundle; import android.preference.PreferenceManager; import android.support.v4.app.LoaderManager; import android.support.v4.content.CursorLoader; import android.support.v4.content.Loader; import android.support.v4.widget.NestedScrollView; import android.support.v7.widget.CardView; import android.support.v7.widget.Toolbar; import android.util.Patterns; import android.view.View; import android.widget.EditText; import android.widget.ImageView; import android.widget.TextView; import android.widget.Toast; import com.bumptech.glide.Glide; import com.ewintory.alexandria.R; import com.ewintory.alexandria.camera.CaptureActivity; import com.ewintory.alexandria.camera.Intents; import com.ewintory.alexandria.provider.AlexandriaContract; import com.ewintory.alexandria.service.BookService; import com.ewintory.alexandria.utils.Utils; import butterknife.Bind; import butterknife.OnClick; import butterknife.OnTextChanged; public final class AddActivity extends BaseActivity implements LoaderManager.LoaderCallbacks<Cursor>, SharedPreferences.OnSharedPreferenceChangeListener { public static final int REQUEST_CODE = 0x0000c0de; // Only use bottom 16 bits private final int LOADER_ID = 1; private final String EAN_CONTENT = "eanContent"; @Bind(R.id.toolbar) Toolbar mToolbar; @Bind(R.id.add_book_ean) EditText mEanView; @Bind(R.id.nested_scroll_view) NestedScrollView mNestedScrollView; @Bind(R.id.book_message) TextView mMessageView; @Bind(R.id.book_card) CardView mBookCardView; @Bind(R.id.book_title) TextView mBookTitleView; @Bind(R.id.book_subtitle) TextView mBookSubtitleView; @Bind(R.id.book_authors) TextView mBookAuthorsView; @Bind(R.id.book_categories) TextView mBookCategoriesView; @Bind(R.id.book_image) ImageView mBookImageView; private boolean mFoundBook = false; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_add); mToolbar.setTitle(""); setSupportActionBar(mToolbar); getSupportActionBar().setDisplayHomeAsUpEnabled(true); showBookCard(false); if (savedInstanceState != null) { mEanView.setText(savedInstanceState.getString(EAN_CONTENT)); mEanView.setHint(""); } } @Override public void onResume() { super.onResume(); PreferenceManager.getDefaultSharedPreferences(this).registerOnSharedPreferenceChangeListener(this); } @Override public void onPause() { PreferenceManager.getDefaultSharedPreferences(this).unregisterOnSharedPreferenceChangeListener(this); super.onPause(); } @Override public void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); if (mEanView != null) { outState.putString(EAN_CONTENT, mEanView.getText().toString()); } } @OnTextChanged(R.id.add_book_ean) public void searchBook(CharSequence s) { String ean = Utils.fixEanForISBN13(this, s.toString()); if (ean.length() < 13) { return; } if (ean.length() < 13) { showBookCard(false); return; } mFoundBook = false; Utils.resetBookServiceStatus(this); //Once we have an ISBN, start a book intent Intent bookIntent = new Intent(AddActivity.this, BookService.class); bookIntent.putExtra(BookService.EXTRA_EAN, ean); bookIntent.setAction(BookService.ACTION_FETCH_BOOK); startService(bookIntent); restartLoader(); } @OnClick(R.id.scan_book_fab) public void onScanButton() { Intent intent = new Intent(this, CaptureActivity.class); startActivityForResult(intent, REQUEST_CODE); } @OnClick(R.id.save_button) public void saveBook() { Intent bookIntent = new Intent(this, BookService.class); bookIntent.putExtra(BookService.EXTRA_EAN, mEanView.getText().toString()); bookIntent.setAction(BookService.ACTION_FETCH_BOOK); startService(bookIntent); Toast.makeText(this, R.string.message_book_saved, Toast.LENGTH_SHORT).show(); showBookCard(false); } @OnClick(R.id.button_delete) public void deleteBook() { Intent bookIntent = new Intent(this, BookService.class); bookIntent.putExtra(BookService.EXTRA_EAN, mEanView.getText().toString()); bookIntent.setAction(BookService.ACTION_DELETE_BOOK); startService(bookIntent); Toast.makeText(this, R.string.message_book_removed, Toast.LENGTH_SHORT).show(); showBookCard(false); mEanView.setText(""); mNestedScrollView.smoothScrollTo(0, 0); } @OnClick(R.id.dismiss_button) public void dismissBook() { mEanView.setText(""); showBookCard(false); mNestedScrollView.smoothScrollTo(0, 0); } @Override public void onActivityResult(int requestCode, int resultCode, Intent data) { if (requestCode == REQUEST_CODE) { if (resultCode == Activity.RESULT_OK) { mEanView.setText(data.getStringExtra(Intents.Scan.RESULT)); } } } @Override public Loader<Cursor> onCreateLoader(int id, Bundle args) { if (mEanView.getText().length() == 0) { return null; } String eanStr = Utils.fixEanForISBN13(this, mEanView.getText().toString()); long eanLong = Utils.convertEanStringToLong(eanStr); if (eanLong == -1) { return null; } return new CursorLoader(this, AlexandriaContract.BookEntry.buildFullBookUri(eanLong), null, null, null, null); } @Override public void onLoadFinished(Loader<Cursor> loader, Cursor data) { if (!data.moveToFirst()) { mFoundBook = false; return; } mFoundBook = true; clearMessage(); String bookTitle = data.getString(data.getColumnIndex(AlexandriaContract.BookEntry.TITLE)); mBookTitleView.setText(bookTitle); String bookSubTitle = data.getString(data.getColumnIndex(AlexandriaContract.BookEntry.SUBTITLE)); mBookSubtitleView.setText(bookSubTitle); String authors = data.getString(data.getColumnIndex(AlexandriaContract.AuthorEntry.AUTHOR)); String[] authorsArr = (authors != null) ? authors.split(",") : new String[0]; mBookAuthorsView.setLines(authorsArr.length); mBookAuthorsView.setText((authors != null) ? authors.replace(",", "\n") : ""); String imgUrl = data.getString(data.getColumnIndex(AlexandriaContract.BookEntry.IMAGE_URL)); if (Patterns.WEB_URL.matcher(imgUrl).matches()) { Glide.with(this).load(imgUrl).crossFade().into(mBookImageView); } String categories = data.getString(data.getColumnIndex(AlexandriaContract.CategoryEntry.CATEGORY)); mBookCategoriesView.setText(categories); showBookCard(true); } @Override public void onLoaderReset(Loader<Cursor> loader) { /** ignore */ } private void restartLoader() { getSupportLoaderManager().restartLoader(LOADER_ID, null, this); } private void showBookCard(boolean show) { mBookCardView.setEnabled(show); mBookCardView.animate().alpha(show ? 1 : 0).setDuration(300).start(); } private void displayMessage() { if (!mFoundBook) { int message = R.string.error_failed_scan; if (!Utils.isConnected(this)) { message = R.string.error_no_network; } else { switch (Utils.getBookServiceStatus(this)) { case BookService.BOOK_SERVICE_STATUS_SERVER_INVALID: message = R.string.error_server_invalid; break; case BookService.BOOK_SERVICE_STATUS_SERVER_DOWN: message = R.string.error_server_down; break; case BookService.BOOK_SERVICE_STATUS_INVALID: message = R.string.not_found; break; } } showBookCard(false); mMessageView.setVisibility(View.VISIBLE); mMessageView.setText(message); } } private void clearMessage() { mMessageView.setText(""); mMessageView.setVisibility(View.GONE); } @Override public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) { if (key.equals(getString(R.string.pref_book_service_status_key))) { displayMessage(); } } }