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java – Run Hello World on Android Phone-Exceptionshub

Posted by: admin February 25, 2020 Leave a comment


as the problem I have above mentioned
(during this tenure my phone is connected to the system and I prefer my phone instead of emulator) the installation of the app on my phone get complete but the app that had installed when I try to open the app my phone’s screen blink that means the app open but very soon it disappers so why it happens and for java programming language I use android studio….
and their my code is

package com.example.filename.java;

class A
    public static void main(String []args)
        System.out.println("Hello World");

that was my code
and another thing is that when I run the pre-written code of android studio the app opens and runs completely and the hello world appears.
so is there problem in my code or anything else.

How to&Answers:

Android doesn’t run on a JVM and System.out is only shown in logs.

For a Hello World application in android, you need to edit one xml file assuming you started a blank project in android and your main activity(MainActivity.java) is set as launcher activity in Android Manifest and setContentView is called on the xml file(activity_main.xml).

Go to the activity_main.xml file and it should come with a template having a Constraint Layout and a TextView in it(As of Android Studio Version 3.5.3). The text view has a property “text” to which you can assign “Hello World”. When you run this on your emulator or android device it should show Hello World.


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

    android:text="Hello World"
    app:layout_constraintRight_toRightOf="parent" />



protected void onCreate(@Nullable Bundle savedInstanceState) {