How to get android system version

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="#cbd1d1"     >     <TextView         android:id="@+id/tv"         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:textSize="30dp"         android:layout_margin="5dp"         android:padding="5dp"         android:fontFamily="sans-serif-condensed"         android:textColor="@android:color/black"         /> </RelativeLayout> 

MainActivity.java

 package com.cfsuman.me.androidcodesnippets;  import android.app.Activity; import android.content.Context; import android.os.Build; 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);          // Initialize few variables to hold android os build version berita         /*             CODENAME                 The current development codename, or the string "REL" if this is a release build.         */         String codeName = Build.VERSION.CODENAME;          /*             INCREMENTAL                 The internal value used by the underlying source control to represent this build.         */         String incremental = Build.VERSION.INCREMENTAL;          /*             RELEASE                 The user-visible version string.         */         String release = Build.VERSION.RELEASE;          /*             SDK_INT                 The user-visible SDK version of the framework; its possible values are defined                 in Build.VERSION_CODES.         */         int sdkInt = Build.VERSION.SDK_INT;          // Display the build information to TextView         mTextView.setText("android.os.Build.VERSION Information....");         mTextView.setText(mTextView.getText() + "\nCODE NAME : " + codeName);         mTextView.setText(mTextView.getText() + "\nINCREMENTAL : " + incremental);         mTextView.setText(mTextView.getText() + "\nRELEASE : " + release);         mTextView.setText(mTextView.getText() + "\nSDK INT : " + sdkInt);     } }