import android.content.Context;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.inputmethod.InputMethod;
import android.view.inputmethod.InputMethodManager;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends AppCompatActivity {

    EditText urlText;
    WebView wvTarayici;
    Button baglan,geri,yenile,temizle,ileri;

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

        wvTarayici = (WebView) findViewById(R.id.wvTarayici);
        wvTarayici.getSettings().setJavaScriptEnabled(true);
        wvTarayici.getSettings().setLoadWithOverviewMode(true);
        wvTarayici.getSettings().setUseWideViewPort(true);
        wvTarayici.setWebViewClient(new WebViewClient());

        try
        {
            wvTarayici.loadUrl("http://tbmyo.klu.edu.tr");
        }

        catch (Exception hata) {}

        baglan = (Button) findViewById(R.id.btn_baglan);
        geri = (Button) findViewById(R.id.btn_geri);
        yenile = (Button) findViewById(R.id.btn_yenile);
        temizle = (Button) findViewById(R.id.btn_temizle);
        ileri = (Button) findViewById(R.id.btn_ileri);

        baglan.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                String site = urlText.getText().toString();
                wvTarayici.loadUrl(site);
                InputMethodManager inputmanager=(InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
                inputmanager.hideSoftInputFromWindow(urlText.getWindowToken(),0);
            }
        });


        geri.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                if (wvTarayici.canGoBack()) {
                    wvTarayici.goBack();
                }
            }
        });

        temizle.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                wvTarayici.clearHistory();
            }
        });

        yenile.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                wvTarayici.reload();
            }
        });

        ileri.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                if (wvTarayici.canGoForward()) {
                    wvTarayici.goForward();
                }
            }
        });
    }

       public class ViewClient extends WebViewClient{
            @Override
            public boolean shouldOverrideUrlLoading(WebView view,String url)
            {
                view.loadUrl(url);
                return true;
            }
       }

    }






---------------------------------------------------------------------------------

import android.speech.tts.TextToSpeech;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

import java.util.Locale;

public class MainActivity extends AppCompatActivity {

    Button btn;
    TextView metin;

    TextToSpeech textToSpeech;

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

        Button btn = (Button) findViewById(R.id.btn_Gonder);

        btn.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                String text = metin.getText().toString();
                textToSpeech.speak(text, TextToSpeech.QUEUE_FLUSH, null);
            }

        });

        metin = (EditText) findViewById(R.id.txt_etText);
        textToSpeech = new TextToSpeech(MainActivity.this, new TextToSpeech.OnInitListener() {

            @Override
            public void onInit(int status) {
                if (status != TextToSpeech.ERROR) {
                    textToSpeech.setLanguage(Locale.ENGLISH);
                }

            }
        });
    }

        protected void onPause()
    {
    super.onPause();
        if(textToSpeech != null)
        {
            textToSpeech.stop();
            textToSpeech.shutdown();
        }
    }

    }




-----------------------------------------------------------------------------


import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    Button btn;
    EditText metin;

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

        btn = (Button) findViewById(R.id.btn_gonder);
        metin = (EditText) findViewById(R.id.et_girilen);

        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String yazi_toast = metin.getText().toString();
                Toast.makeText(MainActivity.this, yazi_toast, Toast.LENGTH_LONG).show();

                                        }
        });

    }
}




--------------------------------------------------------------------------------

import android.content.Intent;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    Button btn_islem;
    Number sayi1,sayi2;

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

        final EditText sayi1 = (EditText) findViewById(R.id.sayi1);
        final EditText sayi2 = (EditText) findViewById(R.id.sayi2);
        final Button btn_islem = (Button) findViewById(R.id.btn_islem);
        final TextView sonuc = (TextView) findViewById(R.id.tvSonuc);

        btn_islem.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                float s1 = Float.parseFloat(sayi1.getText().toString());
                float s2 = Float.parseFloat((sayi2.getText().toString()));

                sonuc.setText(String.valueOf(s1 + s2));
            }

        });