android - How to get application version name and code

activity_main.xml

 <?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:id="@+id/rl"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:padding="16dp"     tools:context=".MainActivity"     android:background="#fdedfd"     >     <TextView         android:id="@+id/tv"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_centerInParent="true"         android:textSize="50sp"         android:textStyle="bold"         android:fontFamily="sans-serif-condensed"         android:textColor="#f219b5"         /> </RelativeLayout> 

MainActivity.java

 package com.cfsuman.me.androidcodesnippets;  import android.app.Activity; import android.content.Context; import android.content.pm.PackageInfo; import android.content.pm.PackageManager; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.widget.RelativeLayout; import android.widget.TextView;   public class MainActivity extends AppCompatActivity {      private Context mContext;     private Activity mActivity;      private RelativeLayout mRelativeLayout;     private TextView mTextView;       @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);          // Get the application context         mContext = getApplicationContext();          // Get the activity         mActivity = MainActivity.this;          // Get the widgets reference from XML layout         mRelativeLayout = (RelativeLayout) findViewById(R.id.rl);         mTextView = (TextView) findViewById(R.id.tv);          /*             PackageInfo                 Overall information about the contents of a package. This corresponds to all of the                 information collected from AndroidManifest.xml.         */         try{             PackageInfo packageInfo = getPackageManager().getPackageInfo(getPackageName(),0);              /*                 versionName                     The version name of this package, as specified by the <manifest> tag's                     versionName attribute.             */             String versionName = packageInfo.versionName;              /*                 versionCode                     The version number of this package, as specified by the <manifest> tag's                     versionCode attribute.             */             int versionCode = packageInfo.versionCode;              // Display the application version name and code to TextView             mTextView.setText("Version Name : " + versionName);             mTextView.setText(mTextView.getText() + "\nVersion Code : " + versionCode);         }catch (PackageManager.NameNotFoundException e){             e.printStackTrace();         }    } } 

build.gradle

 apply plugin: 'com.android.application'  android {     compileSdkVersion 23     buildToolsVersion "23.0.1"      defaultConfig {         applicationId "com.cfsuman.me.androidcodesnippets"         minSdkVersion 16         targetSdkVersion 23         versionCode 2         versionName "1.1"     }     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' }