Android Tutorial

Following example shows you how to define a simple Android custom component with custom attributes.
Step Description
1
You will use Eclipse IDE to create an Android application and name it as DateViewDemounder a
package com.example.dateviewdemo as explained in the Hello World Examplechapter.
2 Create an XML res/values/attrs.xml file to define new attributes alongwith their data type.
3
4
Create src/DateView.java file and add the code to define your custom component. It will extend TextView and
will have additional functionality to show current date. You will provide attributes parsing logic in of the
constructors having AttributeSet as a parameter.
Modify res/layout/activity_main.xml file and add the code to create DateView instance along with few default
attributes and new attributes.
5 Run the application to launch Android emulator and verify the result of the changes done in the aplication.
Following is the content of the modified main activity filesrc/com.example.dateviewdemo/MainActivity.java. This
file can include each of the fundamental lifecycle methods.
package com.example.dateviewdemo;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
public class MainActivity extends Activity {
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the
// action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
Following will be the content of res/values/attrs.xml file:
Following will be the content of new file src/com.example.dateviewdemo/DateView.java, which will have
additional functionality to show current date:
package com.example.dateviewdemo;
TUTORIALS POINT
Simply Easy Learning