Check internet connection

In android we  have to build applications which require internet therefore there is need to check whether the internet in connected to device or not. I have written a simple example to check the internet connection the code is given below:

when internet is OFF

when internet is ON

Manifest file

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

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

  package="com.apkglobal.blog_connection">

    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>
    <uses-permission android:name="android.permission.INTERNET"></uses-permission>

    <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>

MainActivity.java

public class MainActivity extends AppCompatActivity {
    Context _context;


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


        ConnectivityManager connectivity = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
        if (connectivity != null) {
            NetworkInfo[] info = connectivity.getAllNetworkInfo();
            if (info != null) {
                for (int i = 0; i < info.length; i++) {
                    if (info[i].getState() == NetworkInfo.State.CONNECTED) {

                        Toast.makeText(this, "Internet is connected", Toast.LENGTH_SHORT).show();

                    }
                    else {
                        Toast.makeText(this, "No internet", Toast.LENGTH_SHORT).show();
                    }
                }
            }

  }

 else {
            Toast.makeText(this, "No internet", Toast.LENGTH_SHORT).show();
        }
    }
}

activitymain.xml

<?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=".MainActivity">

    <TextView       

    android:layout_width="wrap_content"     

    android:layout_height="wrap_content"   

    android:text="Hello World!"        

       app:layout_constraintBottom_toBottomOf="parent"  

       app:layout_constraintLeft_toLeftOf="parent" 

       app:layout_constraintRight_toRightOf="parent" 

       app:layout_constraintTop_toTopOf="parent" />

</android.support.constraint.ConstraintLayout>