How to Call a Method After a Delay in Android?

In Android, Handlers are used to handle and manage runnable objects. The Handler class is responsible for trigger execution. Handlers are used to manage processes that run in the background. A Handler can also be used to create a delay before executing a function using the post delay function on mobile applications.

Step-By-Step Implementation

Step 1:Create a new project in Android or you can use an already created project.

Step 2: Create an XML file named Acitivity_main.xml in layout folder.

Step 3: Acitivity_main.xml file continent Design of screen like button, text view, etc.

 <?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/idRLContainer"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/txtTitle"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:layout_marginTop="80dp"
        android:text="Candidroot solutions"
        android:textAlignment="center"
        android:textSize="18sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.842"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/text_view_1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@id/button_1"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="72dp"
        android:text="0"
        android:textSize="50sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.498"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/txtTitle" />

    <Button
        android:id="@+id/button_1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:layout_marginTop="112dp"
        android:text="click"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.498"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/text_view_1" />

 </androidx.constraintlayout.widget.ConstraintLayout>

Step 4: Create ActivityMain.java or kt in your project inside (com.my application).

 import android.os.Bundle
 import android.os.Handler
 import android.os.Looper
 import android.view.View
 import android.widget.Button
 import android.widget.TextView
 import android.widget.Toast
 import androidx.appcompat.app.AppCompatActivity


 class MainActivityone : AppCompatActivity() {
    private var send_button: Button? = null

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main_activityone)
        val mTextView = findViewById<TextView>(R.id.text_view_1)
        //assign object of components
        send_button = findViewById(R.id.button_1)

        val mDelay: Long = 5000
        //set click listener of button
        send_button?.setOnClickListener { v: View? ->
            Handler(Looper.getMainLooper()).postDelayed({
                mStartCounter(mTextView, mDelay)
                mSomeFUnction()
            }, mDelay)
        }
    }

    // display after the delay
    private fun mSomeFUnction() {
        Toast.makeText(applicationContext, "Toast is called post delay", Toast.LENGTH_SHORT).show()
    }

    // Function for displaying counter
    private fun mStartCounter(view: TextView, delay: Long) {
        Thread {
            for (i in 0..delay / 1000) {
                runOnUiThread {
                    view.text = i.toString()
                }
                Thread.sleep(1000)
            }
        }.start()
    }
 }

How to Call a Method After a Delay in Android?

Step-By-Step Implementation

Step 1:Create a new project in Android or you can use an already created project.

Step 2: Create an XML file named Acitivity_main.xml in layout folder.

Step 3: Acitivity_main.xml file continent Design of screen like button, text view, etc.

Step 4: Create ActivityMain.java or kt in your project inside (com.my application).

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