Java tutorial
/******************************************************************************* * Copyright 2013 Vitaliy Yakovchuk * * 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.foreignreader; import java.io.File; import com.foreignreader.R; import com.reader.common.ObjectsFactory; import android.content.Intent; import android.os.Bundle; import android.os.Environment; import android.support.v4.app.FragmentActivity; import android.support.v4.app.NavUtils; import android.view.MenuItem; /** * An activity representing a single Word detail screen. This activity is only * used on handset devices. On tablet-size devices, item details are presented * side-by-side with a list of items in a {@link WordListActivity}. * <p> * This activity is mostly just a 'shell' activity containing nothing more than * a {@link WordDetailFragment}. */ public class WordDetailActivity extends FragmentActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); if (BooksActivity.TESTING_STORGE) ObjectsFactory.storageFile = new File(getFilesDir(), "words.db"); else { File file = new File( Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES).getParentFile(), "Foreign Reader"); file.mkdirs(); ObjectsFactory.storageFile = new File(file, "words.db"); } setContentView(R.layout.activity_word_detail); // Show the Up button in the action bar. getActionBar().setDisplayHomeAsUpEnabled(true); // savedInstanceState is non-null when there is fragment state // saved from previous configurations of this activity // (e.g. when rotating the screen from portrait to landscape). // In this case, the fragment will automatically be re-added // to its container so we don't need to manually add it. // For more information, see the Fragments API guide at: // // http://developer.android.com/guide/components/fragments.html // if (savedInstanceState == null) { // Create the detail fragment and add it to the activity // using a fragment transaction. Bundle arguments = new Bundle(); arguments.putString(WordDetailFragment.ARG_ITEM_ID, getIntent().getStringExtra(WordDetailFragment.ARG_ITEM_ID)); WordDetailFragment fragment = new WordDetailFragment(); fragment.setArguments(arguments); getSupportFragmentManager().beginTransaction().add(R.id.word_detail_container, fragment).commit(); } } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case android.R.id.home: // This ID represents the Home or Up button. In the case of this // activity, the Up button is shown. Use NavUtils to allow users // to navigate up one level in the application structure. For // more details, see the Navigation pattern on Android Design: // // http://developer.android.com/design/patterns/navigation.html#up-vs-back // NavUtils.navigateUpTo(this, new Intent(this, WordListActivity.class)); return true; } return super.onOptionsItemSelected(item); } }