Opening new Activity from main activity when clicking button

Hi, Guys in this post i will show you how to open new activity when the user clicks the button.Well, before that we have to know about Intent.

What is Intent ? Who is He ?

Hmmmm !!!, He is a intermediate who helps us to call the Activity,Service within same application  and also you can call the activities of other applications.

How to create intent ?

Since Intent is a class we have to create a object for it.

Intent object = new Intent(context,AnotherActivity.class);
startActivity(object);

• Above is the general syntax to call intent.

Let's Start !

Step-1 : Fire Up ! Android studio.

Step-2 :Create New Project and Name it CallActivity (Or your oun).



Step-3 : Click Next Select Api-17 as minimum sdk and leave all settings as default. wait until the android studio finish the project setup.

Step-4 : Open the activity_main.xml (Path: app/java/res/layout/activity_main.xml)

Step-5 : Design the layout,delete the default content(HelloWorld Text)  Drag and drop a button from the Virw list.



Step-6 : Change The default caption(Button) for the button.



Step-7 : Yeah ! It's Coding time. Give Life to the Button in your Application.open the MainActivity.java.

Step-8 : Declare the Button object and initialize that button in the java code.

Step-9 : Add the button Declaration code above the onCreate() Method.

Button btn;

Step-10 : Add the button initialization code after last line inside the  onCreate() Method.

btn = (Button) findViewById(R.id.button); //Button Initialization

Step-11 :Next important thing is we have to set the OnClickListener for our button to recogonize  the Click Event.

btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                
            }
        });

Step-11 : Create New Activity ( FILE-> New -> Activity -> Empty Activity) and name it SecondActivity.



Step-12 : Add the main Intent code to out button's setOnclickListener -> OnClick() function.

btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent secIntent = new Intent(MainActivity.this,SecondActivity.class);
                startActivity(secIntent);;
            }

Step-13 : Just run and test it !!! ;)

FULL CODE

 package com.codeboltblog.rajakumar.callactivity;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity{
    Button btn;   //Button Object declaration

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btn = (Button) findViewById(R.id.button); //Button Initialization
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent secIntent = new Intent(MainActivity.this,SecondActivity.class);
                startActivity(secIntent);;
            }
        });
    }
}

OUTCOME :)

[caption id="attachment_165" align="alignleft" width="281"] MAINACTIVITY[/caption]

[caption id="attachment_168" align="alignleft" width="280"] SECONDACTIVITY[/caption]

 

 

 

 

 

 

 

 

 

 

 

 

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