CheckInternet

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="sichlearning.example.com.networkcheck">

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

activity_main.xml

<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:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">





    <Button

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="Button"

        android:layout_centerHorizontal="true"

        android:layout_marginTop="76dp"

        android:onClick="checkInternet"

        />



</RelativeLayout>

MainActivity.java

import android.net.ConnectivityManager;

import android.os.Bundle;

import android.support.v7.app.AppCompatActivity;

import android.view.View;

import android.widget.Toast;





public class MainActivity extends AppCompatActivity {



    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

    }

    public boolean checkInternet(View view) {



        ConnectivityManager connec =(ConnectivityManager)getSystemService(getBaseContext().CONNECTIVITY_SERVICE);

        if ( connec.getNetworkInfo(0).getState() == android.net.NetworkInfo.State.CONNECTED ||



                connec.getNetworkInfo(0).getState() == android.net.NetworkInfo.State.CONNECTING ||

                connec.getNetworkInfo(1).getState() == android.net.NetworkInfo.State.CONNECTING ||

                connec.getNetworkInfo(1).getState() == android.net.NetworkInfo.State.CONNECTED ) {

            Toast.makeText(this, " Connected ", Toast.LENGTH_LONG).show();

            return true;

        }else if (

                connec.getNetworkInfo(0).getState() == android.net.NetworkInfo.State.DISCONNECTED ||

                        connec.getNetworkInfo(1).getState() == android.net.NetworkInfo.State.DISCONNECTED  ) {

            Toast.makeText(this, " Not Connected ", Toast.LENGTH_LONG).show();

            return false;

        }

        return false;

    }



}