Application How To ...

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 <!-- Main Activity-->

    <activity android:name="YourActivityName" >

        <intent-filter>

      <!-- MAIN represents that it is the Main Activity-->

            <action android:name="android.intent.action.MAIN" />

      <!-- Launcher Denotes that it will be the first launching activity-->

            <category android:name="android.intent.category.LAUNCHER" />

        </intent-filter>

    </activity>

 <!--Add Other activities like this-->

    <activity android:name="YourActivityName2" >

 <!--Default Intent Filter-->

        <intent-filter>

            <action android:name="android.intent.action.DEFAULT" />

        </intent-filter>

    </activity>

 <!--OR Other activities like this And  intent filter is not necessary in other activites-->

    <activity android:name="YourActivityName3" >

    </activity>

 <!--OR Add Other activities like this-->

    <activity android:name="YourActivityName4" />

Create an empty activity project using Android Studio.; the Manifest file contains only the following items

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.example.gcarabel.brembillaexercisefromemptyactivity">

    <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" />

</manifest>

if you run this app the error: "Default Activity not found" is reported during gradle compilation. It is therefore necessary to add a default activity in the Manifest file as follows:

<!-- Main Activity-->

<activity android:name=".MainActivity" >

    <intent-filter>

        <!-- MAIN represents that it is the Main Activity-->

        <action android:name="android.intent.action.MAIN" />

        <!-- Launcher Denotes that it will be the first launching activity-->

        <category android:name="android.intent.category.LAUNCHER" />

    </intent-filter>

</activity>

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

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.example.gcarabel.brembillaexercisefromemptyactivity">

    <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" >

        <!-- Main Activity-->

        <activity android:name=".MainActivity" >

            <intent-filter>

                <!-- MAIN represents that it is the Main Activity-->

                <action android:name="android.intent.action.MAIN" />

                <!-- Launcher Denotes that it will be the first launching activity-->

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

    </application>

</manifest>

Now it is necessary to create the res/layout directory, since no layout has been created when running an empty activity. below an example of how the activity_main.xml file looks like using the ConstraintLayout with a simple TextView

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

<android.support.constraint.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="com.example.gcarabel.brembillaexercisefromemptyactivity.MainActivity">

    <TextView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="brembillaexercisefromemptyactivity"

        app:layout_constraintBottom_toBottomOf="parent"

        app:layout_constraintLeft_toLeftOf="parent"

        app:layout_constraintRight_toRightOf="parent"

        app:layout_constraintTop_toTopOf="parent" />

</android.support.constraint.ConstraintLayout>

package com.example.gcarabel.brembillaexercisefromemptyactivity;

import android.os.Bundle;

import android.support.v7.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

Be also sure that the gradle file has the following dependencies. (version depends on the available one). This because in my case I am using ConstraintLayout. Different dependencies might be required for different layouts.

dependencies {

    implementation fileTree(dir: 'libs', include: ['*.jar'])

    androidTestImplementation('com.android.support.test.espresso:espresso-core:2.2.2', {

        exclude group: 'com.android.support', module: 'support-annotations'

})

    implementation 'com.android.support:appcompat-v7:26.0.0-beta2'

    implementation "com.android.support:support-core-utils:26.0.0-beta2"

    implementation 'com.android.support.constraint:constraint-layout:1.0.2'

    implementation 'com.google.android.gms:play-services-vision:11.0.2'

    testImplementation 'junit:junit:4.12'

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