apply plugin: 'com.android.application'

android {

   compileSdkVersion 23

   buildToolsVersion "23.0.2"

   defaultConfig {

       applicationId "com.notarazi.myempty1"

       minSdkVersion 15

       targetSdkVersion 23

       versionCode 1

       versionName "1.0"

   }

   buildTypes {

       release {

           minifyEnabled false

           proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'

       }

   }

}

dependencies {

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

   testCompile 'junit:junit:4.12'

   compile 'com.android.support:appcompat-v7:23.1.1'

}

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

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

   package="com.notarazi.myempty1">

   <application

       android:allowBackup="true"

       android:icon="@mipmap/ic_launcher"

       android:label="@string/app_name"

       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>

package com.notarazi.myempty1;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

public class MainActivity extends AppCompatActivity {

   @Override

   protected void onCreate(Bundle savedInstanceState) {

       super.onCreate(savedInstanceState);

       setContentView(R.layout.activity_main);

   }

}

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

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

   xmlns:tools="http://schemas.android.com/tools"

   android:layout_width="match_parent"

   android:layout_height="match_parent"

   android:paddingBottom="@dimen/activity_vertical_margin"

   android:paddingLeft="@dimen/activity_horizontal_margin"

   android:paddingRight="@dimen/activity_horizontal_margin"

   android:paddingTop="@dimen/activity_vertical_margin"

   tools:context="com.notarazi.myempty1.MainActivity">

   <TextView

       android:layout_width="wrap_content"

       android:layout_height="wrap_content"

       android:text="Hello World!" />

</RelativeLayout>

File Naming Convention:

Controller File → MainActivity.java

Layout File → res/layout/activity_main.xml

<resources>

   <string name="app_name">MyEmpty1</string>

</resources>

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

<resources>

   <color name="colorPrimary">#3F51B5</color>

   <color name="colorPrimaryDark">#303F9F</color>

   <color name="colorAccent">#FF4081</color>

</resources>

<resources>

   <!-- Default screen margins, per the Android Design guidelines. -->

   <dimen name="activity_horizontal_margin">16dp</dimen>

   <dimen name="activity_vertical_margin">16dp</dimen>

</resources>

<resources>

   <!-- Base application theme. -->

   <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">

       <!-- Customize your theme here. -->

       <item name="colorPrimary">@color/colorPrimary</item>

       <item name="colorPrimaryDark">@color/colorPrimaryDark</item>

       <item name="colorAccent">@color/colorAccent</item>

   </style>

</resources>