5-android-event-handling

19 Pages·2016·1.06 MB·Swedish

BAB 5
Android Event Handling
Mahardeka Tri Ananta
[email protected]
Lab. Pemrograman Aplikasi Perangkat Bergerak FILKOM UB
Konten
• Event pada Widget
• Event Handler
• Event Listener
Lab. PemrogramanAplikasiPerangkatBergerakFILKOM UB
Event
• Event adalah suatu cara untuk mengumpulkan data tentang interaksi
pengguna dengan komponen interaktif dari Aplikasi.
• Contoh: Aksi (action) yang terjadi ketika user berinteraksi dengan
widget (clicks, typing, scrolling)
Lab. Pemrograman Aplikasi Perangkat Bergerak FILKOM UB
Setting an Event Listener (SoftCoding)
1. Interacting with widgets /views
• in Layout, give that view a unique ID property value
• in Java code, call findViewById to access its View object
• pass it a parameter of R.id.your_unique_ID
• cast the returned value to the appropriate type (Button, TextView,
etc.)
• In Layout XML file:
<TextView android:id="@+id/textViewName"/>
• In Activity onCreate() method:
TextView nameView = (TextView)findViewById(R.id.textViewName);
Lab. Pemrograman Aplikasi Perangkat Bergerak FILKOM UB
Setting an Event Listener (SoftCoding)
2. Modify onClick property in layout file.
• Scroll down its Properties until you find onClick. or edit .XML file manually via
text.
• Type the name of a method you'll write to handle the click event
Lab. Pemrograman Aplikasi Perangkat Bergerak FILKOM UB
Setting an Event Listener (SoftCoding)
3. Add method in onclick Event in JavaCode
• In your Activity, create method that have been registered in layout.
• Add View object in method parameter.
Lab. Pemrograman Aplikasi Perangkat Bergerak FILKOM UB
activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:gravity="center">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="call 0888111222"
android:id="@+id/button"
android:layout_gravity="center"
android:onClick="button1" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button 2"
android:id="@+id/button2"
android:layout_gravity="center"
android:onClick="button2" />
</LinearLayout>
Lab. Pemrograman Aplikasi Perangkat Bergerak FILKOM UB
MainActivity.java
public class MainActivity extends AppCompatActivity {
private Button button1, button2;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button1=(Button)findViewById(R.id.button);
button2=(Button)findViewById(R.id.button2);
}
public void button1(View view){
Intent dial = new Intent(Intent.ACTION_DIAL, Uri.parse("tel:[phone]"));
startActivity(dial);
}
public void button2 (View view){
Toast.makeText(this,"you have pressed: " +button2.getText(), Toast.LENGTH_LONG).show();
}
}
Lab. Pemrograman Aplikasi Perangkat Bergerak FILKOM UB
Setting an Event Listener (Hard Coding)
• An event is handled by an event listener object.
• Define an object that implements event listener interface and register
it with the designated View.
• View.OnClickListener (for handling "clicks" on a View),
• View.OnTouchListener (for handling screen touch events),
• View.OnKeyListener (for handling device key presses).
• etc..
Lab. Pemrograman Aplikasi Perangkat Bergerak FILKOM UB
Setting an Event Listener (Hard Coding)
User Click
Event
Illustration 
View Widget
Button
onClick()
setOnClickListener()
Event Handler Object
View.OnClickListener
Lab. Pemrograman Aplikasi Perangkat Bergerak FILKOM UB