Java tutorial
/* * Copyright (C) 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 com.ttarn.followme; import android.annotation.TargetApi; import android.app.Activity; import android.app.FragmentTransaction; import android.net.Uri; import android.os.Build; import android.os.Bundle; import android.support.v4.app.NavUtils; import android.view.MenuItem; import com.ttarn.followme.util.Utils; /** * This class defines a simple FragmentActivity as the parent of {@link ContactDetailFragment}. */ public class ContactDetailActivity extends Activity { // Defines a tag for identifying the single fragment that this activity holds private static final String TAG = "ContactDetailActivity"; @Override protected void onCreate(Bundle savedInstanceState) { if (BuildConfig.DEBUG) { // Enable strict mode checks when in debug modes Utils.enableStrictMode(); } super.onCreate(savedInstanceState); // This activity expects to receive an intent that contains the uri of a contact if (getIntent() != null) { // For OS versions honeycomb and higher use action bar if (Utils.hasHoneycomb()) { // Enables action bar "up" navigation //getActionBar().setDisplayHomeAsUpEnabled(true); } // Fetch the data Uri from the intent provided to this activity final Uri uri = getIntent().getData(); // Checks to see if fragment has already been added, otherwise adds a new // ContactDetailFragment with the Uri provided in the intent if (getFragmentManager().findFragmentByTag(TAG) == null) { final FragmentTransaction ft = getFragmentManager().beginTransaction(); // Adds a newly created ContactDetailFragment that is instantiated with the // data Uri ft.add(android.R.id.content, ContactDetailFragment.newInstance(uri), TAG); //ft.show(ContactDetailFragment.newInstance(uri)).addToBackStack(null).commit(); ft.commit(); } } else { // No intent provided, nothing to do so finish() finish(); } } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case android.R.id.home: // Tapping on top left ActionBar icon navigates "up" to hierarchical parent screen. // The parent is defined in the AndroidManifest entry for this activity via the // parentActivityName attribute (and via meta-data tag for OS versions before API // Level 16). See the "Tasks and Back Stack" guide for more information: // http://developer.android.com/guide/components/tasks-and-back-stack.html NavUtils.navigateUpFromSameTask(this); return true; } // Otherwise, pass the item to the super implementation for handling, as described in the // documentation. return super.onOptionsItemSelected(item); } }