Create a Button click without using a onClickListener in android example

Create a Button click without using a onClickListener in android example

In this example we are not using a onClickListner for giving action to a button ,in this example we are just give the reference to main.xml  for the onClick

Here is the code for the main.xml

main.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:orientation="vertical"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    >

<TextView  

    android:layout_width="fill_parent" 

    android:layout_height="wrap_content" 

    android:text="@string/hello"

    />

    <Button 

    android:id="@+id/button1"

    android:text="hai"

    android:layout_width="62dip"

    android:layout_height="62dip"

    android:layout_marginLeft="75dip"

    android:layout_marginTop="75dip"

    android:onClick="sendmsg"/>

</LinearLayout>

the method name in the main activity which is used for giving action have the same name as that of the main.xml -onclick .that is in main actvity we have methode named sendmsg().one thing you must notice that this method must be public and return a void return value

ButtonclickActivity

package a.b;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.Toast;

public class ButtonclickActivity extends Activity {

 Button b1;

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

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

      

        b1=(Button)findViewById(R.id.button1);

        

        

    }

    public void sendmsg(View v)

    {

    if (v==b1)

    {

    Toast.makeText(this, "haiiiiii",Toast.LENGTH_LONG).show();

    }

    }

    

}