Android Uygulama İnternet Tarayıcısı yapma

<RelativeLayout xmlns:android="//schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#E0E0D1" >


    <LinearLayout
        android:id="@+id/iki"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

        <TextView
            android:id="@+id/textViewURL"
            android:layout_width="50dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:paddingLeft="13dp"
            android:textColor="#000"
            android:text="URL" />

        <EditText
            android:id="@+id/URL"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:ems="10" >
        </EditText>

        <Button
            android:id="@+id/Git"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="Git" />
    </LinearLayout>


    <WebView
        android:id="@+id/webV"
        android:layout_width="fill_parent"
        android:layout_height="850dp"
        android:layout_below="@id/iki" />

    <LinearLayout
        android:id="@+id/bir"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:weightSum="3"
        android:layout_below="@+id/webV"
        >

        <Button
            android:id="@+id/Geri"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="Geri" />

        <Button
            android:id="@+id/Anasayfa"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="Anasayfa" />

        <Button
            android:id="@+id/Ileri"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="Ileri"
   />
    </LinearLayout>
</RelativeLayout>

package com.example.myapplication;

import android.app.AlertDialog;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;


public class MainActivity extends ActionBarActivity {
    Button Geri,Ileri, Anasayfa, Git;
    WebView webV;
    EditText URL;
      [USER=931120]Override[/USER]

    public **** onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);
        webV = (WebView) findViewById(R.id.webV);
        webV.getSettings().setJavaScriptEnabled(true);
        webV.setWebViewClient(new MyWebViewClient());
        webV.loadUrl("//www.google.com.tr");
        URL = (EditText) findViewById(R.id.URL);

        Geri = (Button) findViewById(R.id.Geri);
        Ileri = (Button) findViewById(R.id.Ileri);
        Anasayfa = (Button) findViewById(R.id.Anasayfa);
        Git = (Button) findViewById(R.id.Git);

        Git.setOnClickListener(new View.OnClickListener() {
              [USER=931120]Override[/USER]
            public **** onClick(View arg0) {
                if (URL.getText().toString().length() > 10) {
                    Toast.makeText(
                            getApplicationContext(),
                            URL.getText().toString()
                                    + " adresi yükleniyor...",
                            Toast.LENGTH_SHORT).show();

                    if (InternetKontrol())
                        webV.loadUrl("//"+URL.getText().toString());
                    else
                        BaglantiHatasiVer();
                } else {
                    Toast.makeText(getApplicationContext(), "Geçersiz Adres",
                            Toast.LENGTH_SHORT).show();
                }
            }
        });

        Anasayfa.setOnClickListener(new View.OnClickListener() {
              [USER=931120]Override[/USER]
            public **** onClick(View arg0) {
                if (InternetKontrol())
                    webV.loadUrl("//www.google.com.tr");
                else
                    BaglantiHatasiVer();
            }
        });


        Geri.setOnClickListener(new View.OnClickListener() {
              [USER=931120]Override[/USER]
            public **** onClick(View arg0) {
                if (webV.canGoBack()) {
                    webV.goBack();
                }
            }
        });

        Ileri.setOnClickListener(new View.OnClickListener() {
              [USER=931120]Override[/USER]
            public **** onClick(View arg0) {
                if (webV.canGoForward()) {
                    webV.goForward();
                }
            }
        });

    }
    private class MyWebViewClient extends WebViewClient {
          [USER=931120]Override[/USER]
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            view.loadUrl(url);
            return true;
        }
    }
    public **** BaglantiHatasiVer() {
        AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(
                MainActivity.this);
        alertDialogBuilder.setTitle("Sunucu Hatası");
        alertDialogBuilder.setMessage(
                "internet bağlantınızı kontrol edip tekrar deneyin")
                .setCancelable(true);
        AlertDialog alertDialog = alertDialogBuilder.create();
        alertDialog.show();
    }

    public boolean InternetKontrol() {
        ConnectivityManager manager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
        if (manager.getActiveNetworkInfo() != null
                && manager.getActiveNetworkInfo().isAvailable()
                && manager.getActiveNetworkInfo().isConnected()) {
            return true;
        } else {
            return false;
        }
    }
      [USER=931120]Override[/USER]
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

      [USER=931120]Override[/USER]
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}
Ve son olarak Manifest dosyasına da 2 tane izin ekliyoruz.
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>