Java tutorial
/* * Copyright 2013 The Android Open Source Project * * 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 ykim81.cs.brown.ykim81.cardemulation; import android.nfc.NfcAdapter; import android.os.Bundle; import android.support.v4.app.FragmentTransaction; import android.widget.Toast; import ykim81.cs.brown.ykim81.common.activities.SampleActivityBase; /** * A simple launcher activity containing a summary sample description, sample log and a custom * {@link android.support.v4.app.Fragment} which can display a view. * <p> * For devices with displays with a width of 720dp or greater, the sample log is always visible, * on other devices it's visibility is controlled by an item on the Action Bar. */ public class MainActivity extends SampleActivityBase { public static final String TAG = "MainActivity"; // Whether the Log Fragment is currently shown private boolean mLogShown; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); if (NfcAdapter.getDefaultAdapter(this) == null) { //Handle some NFC initialization here Toast.makeText(this, "NFC not available on this device", Toast.LENGTH_LONG).show(); } if (savedInstanceState == null) { FragmentTransaction transaction = getSupportFragmentManager().beginTransaction(); CardEmulationFragment fragment = new CardEmulationFragment(); transaction.replace(R.id.sample_content_fragment, fragment); transaction.commit(); } } }