The document discusses buttons in Android applications. It explains that buttons can contain text or images and are defined in XML layout files using <Button> elements. The document also provides an example XML layout file with an ImageButton and Button, and the corresponding Java code to set onclick listeners for the buttons and display Toast messages when each button is clicked.

1. Android Button
BHAVIN JOSHI
125010693017
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2. Index
 About Button
 XML File
 Java File
 Example
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3. XML File
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content”
android:text=“radiobutton" />
<ImageButton
android:id="@+id/img_button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content”
android:src=“@drawable/droid”
/>
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4. About Button
A Basic Button is often use to perform some sort of
actions, such as submitting a selection.
A basic Button control can contain a text or image label.
Within the xml layout resources, button are specified
using “<button>” element.
The Primary attribute for basic button is the field. This is
the label that appear on middle of button’s face.
Example. We often use button control with text
“ok”,”cancel” and “submit”.
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5. JAVA File
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1. Create a class implements the interface
button.setOnClickListener
2. Implement onClickListener() method
3. Perform the action on Button using the method void
onClick().
within the onClick() method, you are free to carry out
whatever action you need.

6. Example
<?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" >
<ImageButton
android:id="@+id/image_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content“
android:src=“@drawable/submit/” />
<Button
android:id="@+id/button1“
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/Cancel” />
</LinearLayout>
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7. Cont….
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8. Java Code of Example
package sl.mc;
import android.os.Bundle;
import android.app.Activity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.Toast;
public class MainActivity extends Activity {
ImageButton button;
Button button2;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
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9. Cont…
button=(ImageButton) findViewById(R.id.imageButton1);
button2=(Button) findViewById(R.id.button1);
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(), "image button is click",
Toast.LENGTH_LONG).show();
}
});
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10. Cont…
button2.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(), "Cancel Button is click", Toast.LENGTH_LONG).show();
}
});
}
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11. Thank You
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