How to get the installation date of any App from your Android App?

In this video it shows how to get the installation date of any App installed on your Android Phone.

In this video it develops an app and then uses the package manager info to fetch the installation date of the app based on it’s package name. Package Manager Info can also be used to get other information such as last modified date, installation path, etc. However, in this video it is only shown about the first installation date.

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Source Code:

package com.programmerworld.appsinstallationdate;

import androidx.appcompat.app.AppCompatActivity;

import android.content.pm.PackageManager;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

import java.util.Date;

public class MainActivity extends AppCompatActivity {
    private TextView textViewDate;
    private EditText editTextAppName;

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

        editTextAppName = findViewById(R.id.editTextAppName);
        textViewDate = findViewById(R.id.textviewOutput);
    }

    public void buttonGetInstallationDate(View view){
        String stringPackageName;

        if (editTextAppName.getText().toString().equals("")){
            stringPackageName = this.getPackageName();
        }else {
            stringPackageName = "com.programmerworld." + editTextAppName.getText().toString();
        }

        long longInstallationDate = 0;
        try {
            longInstallationDate = this.getPackageManager().getPackageInfo(stringPackageName, 0).firstInstallTime;
        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
        }
        Date date = new Date(longInstallationDate);
        textViewDate.setText(date.toString().substring(0,19));
    }
}

<?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/textviewOutput"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/date_displayed_here"
        android:textSize="30sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="101dp"
        android:layout_marginTop="223dp"
        android:onClick="buttonGetInstallationDate"
        android:text="@string/get_installation_date"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <EditText
        android:id="@+id/editTextAppName"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="90dp"
        android:layout_marginTop="93dp"
        android:ems="10"
        android:hint="@string/enter_app_s_name"
        android:inputType="textPersonName"
        android:textAlignment="center"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        android:autofillHints="" />

</androidx.constraintlayout.widget.ConstraintLayout>

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

    <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/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

</manifest>

<resources>
    <string name="app_name">Apps Installation Date</string>
    <string name="get_installation_date">Get Installation Date</string>
    <string name="enter_app_s_name">Enter App\'s Name ...</string>
    <string name="date_displayed_here">Date displayed here ...</string>
</resources>

apply plugin: 'com.android.application'

android {
    compileSdkVersion 29
    buildToolsVersion "29.0.3"

    defaultConfig {
        applicationId "com.programmerworld.appsinstallationdate"
        minSdkVersion 26
        targetSdkVersion 29
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

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

dependencies {
    implementation fileTree(dir: "libs", include: ["*.jar"])
    implementation 'androidx.appcompat:appcompat:1.2.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.0.1'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test.ext:junit:1.1.2'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'

}

// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath "com.android.tools.build:gradle:4.0.1"

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        google()
        jcenter()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}