Creating UI using XML and Java

Below are the two ways to create UI (User Interface)
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1) Using XML (use below 2 files)

i) XML code (/res/layout/main.xml)

<?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" >

    <TextView

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:text="UI Created by using XML layout (res/layout/main.xml)" 

        android:textColor="#FF11AA33"

     />

</LinearLayout>

ii) Java (/src/MyXmlLayoutActivity.java)

import android.app.Activity;

import android.os.Bundle;

public class MyXmlLayoutActivity extends Activity {

    /** Called when the activity is first created. */

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

    }

}

Output

2) Using Java (use below 1 file)

import android.app.Activity;

import android.graphics.Color;

import android.os.Bundle;

import android.widget.LinearLayout;

import android.widget.TextView;

public class MyJavaLayoutActivity extends Activity {

LinearLayout linear;

TextView text;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

linear = new LinearLayout(this);

linear.setOrientation(LinearLayout.VERTICAL);

text = new TextView(this);

text.setText("UI Created by Java Code without using /layout/main.xml");

text.setTextColor(Color.parseColor("#FF11AA33")); //#AARRGGBB format 

linear.addView(text);

setContentView(linear);

}

}

Output