Android Buttons

We use “android.widget.Button” class to display a button. in this Tutorial we will learn about simple Button and it's click events.

let's take a example of Button.In this example we will click on button and display a massage on screen.

1.create layout and take a button(we can drag Button from widgets pellet) 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/rTop"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="New Button"
        android:id="@+id/button" />
</LinearLayout>

2.Create MainActivity.java class in your package 

package com.inwizards.oceanpark.utility;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
import com.inwizards.oceanpark.R;
public class DemoTest extends Activity {
    Button demoButton;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        demoButton= (Button) findViewById(R.id.bottom);

//click on button and display a massage on screen    
        demoButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(DemoTest.this, "click on Button", Toast.LENGTH_SHORT).show();
             }
        });
//Long press on button and display a massage on screen
    demoButton.setOnLongClickListener(new View.OnLongClickListener() {
            @Override
            public boolean onLongClick(View v) {
                Toast.makeText(DemoTest.this, " On long press on Button",                                                                           Toast.LENGTH_SHORT).show();
                return true;
            }
        });
    }
 }
}