Java tutorial
/* * Copyright 2015 Christian Basler * * 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 ch.dissem.apps.abit; import android.content.Intent; import android.os.Bundle; import android.support.v4.app.NavUtils; import android.support.v7.app.AppCompatActivity; import android.support.v7.widget.Toolbar; import android.view.MenuItem; /** * An activity representing a single Subscription 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 MessageListActivity}. * <p/> * This activity is mostly just a 'shell' activity containing nothing * more than a {@link SubscriptionDetailFragment}. */ public class SubscriptionDetailActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.toolbar_layout); final Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); setSupportActionBar(toolbar); // Show the Up button in the action bar. getSupportActionBar().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.putSerializable(SubscriptionDetailFragment.ARG_ITEM, getIntent().getSerializableExtra(SubscriptionDetailFragment.ARG_ITEM)); SubscriptionDetailFragment fragment = new SubscriptionDetailFragment(); fragment.setArguments(arguments); getSupportFragmentManager().beginTransaction().add(R.id.content, fragment).commit(); } } @Override public boolean onOptionsItemSelected(MenuItem item) { int id = item.getItemId(); if (id == 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, MessageListActivity.class)); return true; } return super.onOptionsItemSelected(item); } }