How to show progress bar/ image while waiting for a function (INET/ IP address of a website) to finish in your Android App? – using java.util.concurrent

How to wait for a task/ method to finish before moving ahead in the main thread of your Android App?

In this vidoe it shows how to display a wait bar or a progress bar (indeterminate mode) while waiting for a function or method to complete its execution in the Android App.

In this example, it tries to get the INTET address for a website. However, this method can be implemented for any other functionality.

For asynchronized execution, it uses ExecutorService from the java.util.concurrent class as the asynctask is deprecated in the Android now.

I hope you like this video. For any questions, suggestions or appreciation please contact us at: https://programmerworld.co/contact/ or email at: programmerworld1990@gmail.com

Complete source code:

package com.programmerworld.waitprogressbarapp;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.SystemClock;
import android.view.View;
import android.widget.ProgressBar;
import android.widget.TextView;

import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class MainActivity extends AppCompatActivity {

    private TextView textView;
    private ProgressBar progressBar;
    private String stringNetWork;

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

        textView = findViewById(R.id.textView);
        progressBar = findViewById(R.id.progressBar);
        progressBar.setVisibility(View.GONE);
    }

    public void buttonDemo(View view){
        if (progressBar.getVisibility() == View.GONE){
            progressBar.setVisibility(View.VISIBLE);
        }else {
            progressBar.setVisibility(View.GONE);
        }
    }

    public void buttonWaitFunctionality(View view){
        ExecutorService executorService = Executors.newSingleThreadExecutor();
        Handler handler = new Handler(Looper.getMainLooper());
        progressBar.setVisibility(View.VISIBLE);
        executorService.execute(new Runnable() {
            @Override
            public void run() {
                try {
                    InetAddress inetAddress = InetAddress.getByName("www.google.com");
                    SystemClock.sleep(2000);
                    if (!inetAddress.equals("")){
                        stringNetWork = inetAddress.toString();
                    }
                }catch (Exception e){
                    e.printStackTrace();
                }
                handler.post(new Runnable() {
                    @Override
                    public void run() {
                        progressBar.setVisibility(View.GONE);
                        textView.setText(stringNetWork);
                    }
                });
            }
        });
    }
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.programmerworld.waitprogressbarapp">

    <uses-permission android:name="android.permission.INTERNET"/>

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.WaitProgressBarApp">
        <activity
            android:name=".MainActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

<?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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.332" />

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="88dp"
        android:layout_marginTop="32dp"
        android:onClick="buttonDemo"
        android:text="Demo of ProgressBar"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="104dp"
        android:layout_marginTop="78dp"
        android:onClick="buttonWaitFunctionality"
        android:text="Enable Wait Symbol"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/button" />

    <ProgressBar
        android:id="@+id/progressBar"
        style="?android:attr/progressBarStyle"
        android:layout_width="204dp"
        android:layout_height="207dp"
        android:layout_marginStart="112dp"
        android:layout_marginTop="68dp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView" />

</androidx.constraintlayout.widget.ConstraintLayout>

No dependencies needs to implemented or no change in gradle file required.

plugins {
    id 'com.android.application'
}

android {
    compileSdk 31

    defaultConfig {
        applicationId "com.programmerworld.waitprogressbarapp"
        minSdk 31
        targetSdk 31
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
}

dependencies {

    implementation 'androidx.appcompat:appcompat:1.4.1'
    implementation 'com.google.android.material:material:1.5.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.1.3'
    testImplementation 'junit:junit:4.13.2'
    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
}