Connect Layout xml to Java code
Description
The code that connects the activity to the UI (main_layout_xml_file.xml)
is the setContentView() method:
Example
/*from w w w .java 2s .c o m*/
package com.java2s.app;
import android.app.Activity;
import android.os.Bundle;
public class MainActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}
Add the following code in bold to the res/layout/
your main xml file for layout:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
//from www . java 2 s .co m
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello" />
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="This is my first Android Application!" />
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="And this is a clickable button!" />
</LinearLayout>
Note
R.layout.main refers to the main.xml file located in the res/layout folder.
As you add additional XML files to the res/layout folder,
the filenames will automatically be generated in the R.java file.
The onCreate() method is one of many methods that are fired when an activity is
loaded.