A program to demonstrate usage of EditText, Textview and Button
widgets in android this program is very useful for beginners and give
the basic overview on how to use the Api's, using Droiddraw i was able
to design the User Interface with two textbox(EditText) and
Label(TextView) and button as shown in below Pic.
The xml code that is to be saved in main.xml file is
<?xml version="1.0" encoding="utf-8"?>
<AbsoluteLayout
android:id="@+id/widget35"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android"
>
<EditText
android:id="@+id/txtbox1"
android:layout_width="145px"
android:layout_height="40px"
android:text="EditText"
android:textSize="18sp"
android:layout_x="75px"
android:layout_y="54px"
>
</EditText>
<EditText
android:id="@+id/txtbox2"
android:layout_width="144px"
android:layout_height="40px"
android:text="EditText"
android:textSize="18sp"
android:layout_x="75px"
android:layout_y="109px"
>
</EditText>
<Button
android:id="@+id/button1"
android:layout_width="106px"
android:layout_height="36px"
android:text="Button"
android:layout_x="88px"
android:layout_y="224px"
>
</Button>
<TextView
android:id="@+id/lbl1"
android:layout_width="141px"
android:layout_height="wrap_content"
android:text="TextView"
android:layout_x="76px"
android:layout_y="166px"
>
</TextView>
</AbsoluteLayout>
and below is the Java Source code which contains the logic to add two numbers and the refrence to id of the controls can be found in above XML
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class fit extends Activity {
Button button1;
EditText txtbox1,txtbox2;
TextView tv;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
txtbox1= (EditText) findViewById(R.id.txtbox1);
button1 = (Button) findViewById(R.id.button1);
tv = (TextView) findViewById(R.id.lbl1);
txtbox2= (EditText) findViewById(R.id.txtbox2);
button1.setOnClickListener(new clicker());
}
class clicker implements Button.OnClickListener
{
public void onClick(View v)
{
String a,b;
Integer vis;
a = txtbox1.getText().toString();
b = txtbox2.getText().toString();
vis = Integer.parseInt(a)+Integer.parseInt(b);
tv.setText(vis.toString());
}
}
}
in above code we have OnClickListener which is similar to ActionListener in java swing values are taken from the EditText(textbox) and added and the result is showed in TextView(label).
The xml code that is to be saved in main.xml file is
<?xml version="1.0" encoding="utf-8"?>
<AbsoluteLayout
android:id="@+id/widget35"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android"
>
<EditText
android:id="@+id/txtbox1"
android:layout_width="145px"
android:layout_height="40px"
android:text="EditText"
android:textSize="18sp"
android:layout_x="75px"
android:layout_y="54px"
>
</EditText>
<EditText
android:id="@+id/txtbox2"
android:layout_width="144px"
android:layout_height="40px"
android:text="EditText"
android:textSize="18sp"
android:layout_x="75px"
android:layout_y="109px"
>
</EditText>
<Button
android:id="@+id/button1"
android:layout_width="106px"
android:layout_height="36px"
android:text="Button"
android:layout_x="88px"
android:layout_y="224px"
>
</Button>
<TextView
android:id="@+id/lbl1"
android:layout_width="141px"
android:layout_height="wrap_content"
android:text="TextView"
android:layout_x="76px"
android:layout_y="166px"
>
</TextView>
</AbsoluteLayout>
and below is the Java Source code which contains the logic to add two numbers and the refrence to id of the controls can be found in above XML
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class fit extends Activity {
Button button1;
EditText txtbox1,txtbox2;
TextView tv;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
txtbox1= (EditText) findViewById(R.id.txtbox1);
button1 = (Button) findViewById(R.id.button1);
tv = (TextView) findViewById(R.id.lbl1);
txtbox2= (EditText) findViewById(R.id.txtbox2);
button1.setOnClickListener(new clicker());
}
class clicker implements Button.OnClickListener
{
public void onClick(View v)
{
String a,b;
Integer vis;
a = txtbox1.getText().toString();
b = txtbox2.getText().toString();
vis = Integer.parseInt(a)+Integer.parseInt(b);
tv.setText(vis.toString());
}
}
}
in above code we have OnClickListener which is similar to ActionListener in java swing values are taken from the EditText(textbox) and added and the result is showed in TextView(label).
