Monday, 29 September 2025

How to Update a Number Every Second (Latest Android OS)

We will achieve this automatic number update in Android.  Only two files to edit: xml and Java.



First we will set an id, change the text and increase the text size in our default xml file:

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:id="@+id/main"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">

<TextView
android:id="@+id/numberTV"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="00"
android:textSize
="50sp"

app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

Now do some changes in Java file:

1. Create an object of TextView to set our updated text referencing from the xml file.

TextView numberTextView;

2. Create an int variable to hold the updated number. If you don't assign 0, it will set 0 by default.

int number = 0;

3. Create an object of Handler which helps run code with a delay or repeatedly on the main UI thread..

Handler handler = new Handler();

4. Create an object of Runnable.
A Runnable is like a task that you tell Android to run later — either once or repeatedly. In our example, we use it to update a number every second.

Runnable runnable = new Runnable() {
@Override
public void run() {
number++;
numberTextView.setText(String.valueOf(number));
handler.postDelayed(this, 1000);
}
};

Inside the run method we do three things:

a) Increase the value of number
b) Set the value to our text view 
c) Run again after one second

handler.postDelayed(this, 1000);

This line starts the first run after 1 second. After that, the runnable calls itself again every second — so the number keeps increasing.

4. Now inside onCreate method we have to write just two lines of code:

numberTextView = findViewById(R.id.numberTV);
handler.postDelayed(runnable, 1000);

Here we are referencing the text view from our xml file and again calling the postDelayed method of Handler object. But this is called only once when the app starts.

5. At last we have to get out of this continuous execution when the app is not in use, so just call the onDestroy method and call the removeCallbacks method of the handler object.

@Override
protected void onDestroy() {
super.onDestroy();
handler.removeCallbacks(runnable);
}


Here is the complete code:

package com.prashantsj.apps.autoupdatenumber;

import android.os.Bundle;
import android.os.Handler;
import android.widget.TextView;

import androidx.activity.EdgeToEdge;
import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

TextView numberTextView;
int number = 0;
Handler handler = new Handler();
Runnable runnable = new Runnable() {
@Override
public void run() {
number++;
numberTextView.setText(String.valueOf(number));
handler.postDelayed(this, 1000);
}
};

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
EdgeToEdge.enable(this);
setContentView(R.layout.activity_main);

numberTextView = findViewById(R.id.numberTV);
handler.postDelayed(runnable, 1000);
}

@Override
protected void onDestroy() {
super.onDestroy();
handler.removeCallbacks(runnable);
}
}





Thursday, 18 September 2025

How to do Wireless Debugging: The Latest Simple Way!

 To do quick debugging without the traditional way of connecting cable, there is a new and simple way.

Just follow these simple steps:

Step 1: First make sure that your phone & the laptop / pc are connected to the same WIFI network. 

Step 2: In your phone go to settings and select the About phone option.



Step 3: Tap the Build Number continuously 7 times so that you see a message which says 'You are now a Developer'.


Step 4: Now To find that 'Developer Option' you just enabled, just go to Settings and select the 'System' option.


 Step 5: After selecting System, scroll down to see '{} Developer Options'. Select it.


Step 6: After selecting it, you will see an option 'Use Developer options'. Just enable it.


Step 7: Scroll down to find USB debugging. Enable this too.

Step 8: Again scroll down to find Wireless debugging and enable it.


Step 9: Select the Wireless debugging so that you will find two options for pairing: with QR code or with pairing code.

Step 10: Let's select the 'Pair device with QR code' but before that you have to first select the phone from the device list.


Step 11: Once you select your device, a QR code will be displayed which you only have to scan and you are ready to do wireless USB debugging.







Sunday, 14 September 2025

How to create a cool app: 'Just Tap to Change Color!'

Here we will learn the easiest and shortest way to change color of a simple app with just a tap.

     

XML layout:

In the TextView, change the text 'Hello World!' to 'Just Tap', increase its size and make it bold:

android:text="JUST TAP!"
android:textSize="45sp"
android:textStyle="bold"
android:textColor="#ffff00"

Now our activity_main.xml has only this much code. We already have the id set to the Constraint Layout which is android:id="@+id/main"

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:id="@+id/main"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="JUST TAP!"
android:textSize="45sp"
android:textStyle="bold"
android:textColor="#ffff00"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

Now in the MainActivity.java, use the above mentioned id to set a new color:

private ConstraintLayout mainLayout;

Create an array of various colors that we want to appear randomly when we touch the screen:

private int colors[] = {Color.BLUE, Color.BLACK, Color.CYAN, Color.DKGRAY, Color.WHITE, Color.GREEN,
Color.YELLOW, Color.TRANSPARENT, Color.MAGENTA, Color.RED, Color.LTGRAY, Color.GRAY};

Create a Random object to get a random color:

private Random random = new Random();

In the OnCreate method, assign the value to mainLayout:

mainLayout = findViewById(R.id.main);

Finally override the OnUserInteraction method and change the background in this way:

mainLayout.setBackgroundColor(colors[random.nextInt(colors.length - 1)]);

So the full and complete code of MainActivity.java will be:

package com.prashantsj.apps.colorchanger;

import android.graphics.Color;
import android.os.Bundle;
import android.widget.Button;

import androidx.activity.EdgeToEdge;
import androidx.appcompat.app.AppCompatActivity;
import androidx.constraintlayout.widget.ConstraintLayout;

import java.util.Random;

public class MainActivity extends AppCompatActivity {

private ConstraintLayout mainLayout;
private int colors[] = {Color.BLUE, Color.BLACK, Color.CYAN, Color.DKGRAY, Color.WHITE, Color.GREEN,
Color.YELLOW, Color.TRANSPARENT, Color.MAGENTA, Color.RED, Color.LTGRAY, Color.GRAY};
private Random random = new Random();

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
EdgeToEdge.enable(this);
setContentView(R.layout.activity_main);
mainLayout = findViewById(R.id.main);
}

@Override
public void onUserInteraction() {
super.onUserInteraction();

mainLayout.setBackgroundColor(colors[random.nextInt(colors.length - 1)]);
}
}




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