What will I Learn?

Requirements

Procedure

• Now open the activity_main.xml file as shown the tree structure here and click on split button to show the code and design at the same time.

• Now replace the code as given here it include a Linear Layout and a Button inside it with the id message_btn

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity"
    android:gravity="center">

  
    <Button
        android:id="@+id/message_btn"
    android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Show Message"/>
    

</LinearLayout>

• Open the MainActivity.java file as shown the RED line in this mockup

• Insert the Button click code after this line

setContentView(R.layout.activity_main);

here is the button click code

        //Its a code for a button click that we declare in activity_main.xml file
        
        findViewById(R.id.message_btn).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                
                //Its a code to show the message on the screen
                Toast.makeText(MainActivity.this, "Hello Hive", Toast.LENGTH_SHORT).show();
            }
        });

• Picture of all code setup in MainActivity.java

• Now connect you mobile device and lets test the app make sure the Developer Option is on and the USB Debugging is enabled.
• Click on the play button to run the app

Final Result

App on Mobile	Button Clicked

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About me

Hello Friends I am Muhammad Faisal Amin. My country is Pakistan. nI live in a city of Pakistan named Faisalabad. I love my country.
I am 21 years old in 2020.
I study in Software Engineering in University of Agriculture Faisalabad Main Campus it also knows as UAF.
Its a very beautiful University and the biggest University in Asia.
I am also having experiences in MObile App Development using Java Android and Flutter also.
Its my passion to develop quality app for both iPhone and Android Mobiles.