• Android Manifest
• build.gradle file
• Resources
• Layout components
• Layout
• Intent
• Activity

• Java code
• Resources
• Android Manifest
• But before all this say hello to your new best friend, build.gradle file

• General application settings
• What can your application do - use Internet, write to storage,  vibrate...
• Contains list of Activities, Services, Receivers

• Your application needs to ask user for permissions in some cases
• eg. User needs to allow your application to use the Internet
• All permissions are declared in the Android Manifest

<uses-permission android:name="android.permission.INTERNET"/>

• Implements functionality for UI
• Your class needs to extend Android Activity class
• Almost all activities interact with the user
• Activity class creates a window in which you place your UI
• The entire lifecycle of an activity is defined by Activity methods
• You  need to call  superclass method when implementing these methods in you activity

protected void onCreate(Bundle savedInstanceState);             protected void onStart();protected void onRestart();protected void onResume();protected void onPause();protected void onStop();protected void onDestroy();

• Explicit Intent

 Intent i = new Intent (Context, Activity.class); startActivity(i);

Intent i = new Intent (Intent.ACTION_VIEW);i.setData(Uri.parse("http://natjecanje.tvz.hr"));startActivity(i);

 public class MainActivity extends Activity {

    @Override
    protected void onCreate (Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.relative_layout);

     Intent intent = new Intent(this, NewActivity.class);
     startActivity(intent);

    }

}

Android Manifest

<activity android:name=".NewActivity"/>

• Images, strings, layouts, colors...
• All resources are located in res/directory
• Every resource has a generated id in R class
• Resources can be universal for all devices
• Resources can be different for different devices and can depend upon screen size, language...

• res/color -  colors
• drawable - png., 9.png, jpg and gif files
• layout - Application User Interface
• menu - xml files for application menus
• raw - audio files...

• Defines the visual structure for a user interface
• XML file located in res/layout
• Contains UI elements - TextView, Button...
• Each element in layout.xml file extends View class

• Button
• Text View
• Linear Layout
• Relative Layout
• ImageView
• .....

    <Button      android:id="@+id/button_id"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="Button"/>

TextView

     <TextView
      android:text="@string/hello_world"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"                      android:textColor="#000000"      android:textSize="20sp"/>

<LinearLayout   
    android:layout_width="match_parent"                     android:layout_height="match_parent"                 android:orientation="horizontal"    android:gravity="center">
</LinearLayout> 

• Application  https://github.com/sjugc/TVZMc2-Android-1
• Jopa icon http://goo.gl/WmmVaU
• Homework material http://goo.gl/QrRgNs

• http://developer.android.com/guide/topics/manifest/manifest-intro.html
  
• http://developer.android.com/guide/topics/security/permissions.html
  
• https://developer.android.com/guide/components/intents-common.html