Creating an Activity on Button Click

Activity: Activity is a java class that we use in Android Development. It takes care of creating a new window for developers in which you can place your UI(user interface). Well, activities can be of any type, it can be a full-screen window, a floating window or even embedded inside of another activity.

Here, we are going to create a new Activity by clicking on Button.

1) First create a new Project and name it "MyActivity"

2) Now create a new Blank Activity.
     Go to app->java and right click on it.
     Go to New->Activity->BlankActivity
     Now give "NewActivity" as Activity name.

3) In app->res->layout->activity_main.xml, file write this code

<Button
        android:id="@+id/press_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/press"
        android:layout_centerInParent="true"/>

your activity_main.xml file should look like this:  

  
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">

    <Button
        android:id="@+id/press_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/press"
        android:layout_centerInParent="true"/>

</RelativeLayout>
    

4) Go to app->res->values->strings.xml and add the below line

<string name="press">Press</string>

5) Now add the below code in onCreate function of your MainActivity.java file

Button Press = (Button)findViewById(R.id.press_button);
        Press.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent myActivity = new Intent(getBaseContext(),NewActivity.class);
                startActivity(myActivity);
            }
        });

finally, your onCreate function will look like:

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button Press = (Button)findViewById(R.id.press_button);
        Press.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent myActivity = new Intent(getBaseContext(),NewActivity.class);
                startActivity(myActivity);
            }
        });
    }

Note: import Intent library ,
           import android.content.Intent;
         import android.view.View;
           import android.widget.Button;

6) Now go to app->res->layout-activity_new.xml and add this code

 <TextView
        android:text="@string/button_pressed"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
    
finally, activity_new.xml should look like this:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context="com.company.entertainmentbucket.myactivity.NewActivity">

    <TextView
        android:text="@string/button_pressed"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</RelativeLayout>

7) Go to app->res->values->strings.xml and add the below line

<string name="button_pressed">Button is Pressed</string>

That's it....