Developing Android Apps

Developing Android Apps
FOR FUN!
CLAIRE HYUNJUNG LEE

Contens
 Getting Started
 Activity and Fragment
 Start Your Own Project
 Bug and Trouble Shooting

Getting Started
 Installing Android Studio and SDK
https://developer.android.com/sdk/index.html

Getting Started
 Installing JDK
http://www.oracle.com/technetwork/jav
a/javase/downloads/jdk7-downloads-
1880260.html

Getting Started
 Create New Project
 Let’s start your own project

Getting Started
 Target your application to devices and Download SDK
 http://developer.android.com/about/dashboards/index.html?utm_source=ud
acity&utm_medium=mooc&utm_term=android&utm_content=platform_distribu
tion&utm_campaign=training

Getting Started
 What is Activity?
 What is Fragment?

Activity & Fragment
http://developer.android.com/reference/
android/app/Activity.html
 Activity Lifecycle

Activity & Fragment
 Activity Lifecycle
public class Activity extends ApplicationContext {
protected void onCreate(Bundle savedInstanceState);
protected void onStart();
protected void onRestart();
protected void onResume();
protected void onPause();
protected void onStop();
protected void onDestroy();
}

Activity & Fragment
 Starting Activities and Getting Results
public class MyActivity extends Activity {
...
static final int PICK_CONTACT_REQUEST = 0;
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_DPAD_CENTER) {
// When the user center presses, let them pick a contact.
startActivityForResult(
new Intent(Intent.ACTION_PICK,
new Uri("content://contacts")),
PICK_CONTACT_REQUEST);
return true;
}
return false;
}
protected void onActivityResult(int requestCode, int resultCode,
Intent data) {
if (requestCode == PICK_CONTACT_REQUEST) {
if (resultCode == RESULT_OK) {
// A contact was picked. Here we will just display it
// to the user.
startActivity(new Intent(Intent.ACTION_VIEW, data));
}
}
}
}

Activity & Fragment
http://developer.android.com/guide/components/fragments.html

Activity & Fragment
http://developer.androi
d.com/guide/compon
ents/fragments.html

Activity & Fragment
http://developer.android.com/guide/components/fragments.html
 For example, here's a subclass of Fragment that loads a layout from the example_fragment.xml file:
public static class ExampleFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.example_fragment, container, false);
}
}

Activity & Fragment
http://developer.android.co
m/guide/components/fragm
ents.html
 Declare the fragment inside
the activity’s layout file
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent">
<fragment
android:name="com.example.news.ArticleListFragment"
android:id="@+id/list"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="match_parent" />
<fragment
android:name="com.example.news.ArticleReaderFragment"
android:id="@+id/viewer"
android:layout_weight="2"
android:layout_width="0dp"
android:layout_height="match_parent" />
</LinearLayout>

Activity & Fragment
 What is Fragment? http://developer.android.com/guide/components/fragments.html
 Or, programmatically add the fragment to an existing ViewGroup
 To make fragment transactions in your activity (such as add, remove, or replace a fragment),
you must use APIs from FragmentTransaction. You can get an instance
of FragmentTransaction from your Activitylike this:
 You can then add a fragment using the add() method, specifying the fragment to add and the
view in which to insert it. For example:
FragmentManager fragmentManager = getFragmentManager()
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
ExampleFragment fragment = new ExampleFragment();
fragmentTransaction.add(R.id.fragment_container, fragment);
fragmentTransaction.commit();

Activity & Fragment
 What is Fragment? http://developer.android.com/guide/components/fragments.html

Start your own project
 You have your own project!

Bug & Trouble Shooting
 Problems Installing HAXM

 How to Solve
 Here’s some cases that you can solve this problem on Intel website
 https://software.intel.com/en-us/android/articles/installation-instructions-for-
intel-hardware-accelerated-execution-manager-windows
 In this case, Execute Disable was disabled in the system BIOS.

 Problem Resizing Android Emulator on
Windows 8.1
 AVD is out of view on Windows

 How to Solve It on Android Studio
 Click Run
 Edit Configurations
 General Tab
 Choose Emulator and AVD

 How to Solve It on Android Studio
 Click Emulator Tab
 Write –scale 0.x ( In this case, 0.4
was suitable )

 How to Solve It by Using Telnet
 Click Control Panel
 Go to Programs
 Turn Windows features on or off

 How to Solve it by Using Telnet
 Run your application on Android Virtual
Device
 Run CMD in Windows
 Write cd/ to go back to C drive directory
 Use the command ‘telnet localhost
5554’ to connect Android Emulator

 How to Solve it by Using Telnet
 Use the command ‘help’ to see the
Android console command list
 Use the command ‘window scale 0.x’

Developing Android Apps

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