مدیریت دکمه ی Back در اندروید

onBackPressed()

@Override
    public void onBackPressed() {

        super.onBackPressed();
    }

@Override
    public void onBackPressed() {

        super.onBackPressed();
    Toast.makeText(MainActivity.this, "back", Toast.LENGTH_SHORT).show();

    }

super.onBackPressed();

import android.os.Bundle;
import android.app.Activity;
import android.app.AlertDialog;
import android.widget.Toast;
import android.content.DialogInterface;

public class MainActivity extends Activity {

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

    @Override
    public void onBackPressed() {

        super.onBackPressed();
    Toast.makeText(MainActivity.this, "back", Toast.LENGTH_SHORT).show();
    //Display alert message when back button has been pressed
        backButtonHandler();
         return;
    }

public void backButtonHandler() {
    AlertDialog.Builder alertDialog = new AlertDialog.Builder(
            MainActivity.this);
    // Setting Dialog Title
    alertDialog.setTitle("Leave application?");
    // Setting Dialog Message
    alertDialog.setMessage("Are you sure you want to leave the application?");
    // Setting Icon to Dialog
    alertDialog.setIcon(R.drawable.ic_launcher);
    // Setting Positive "Yes" Button
    alertDialog.setPositiveButton("YES",
            new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int which) {
                    finish();
                }
            });
    // Setting Negative "NO" Button
    alertDialog.setNegativeButton("NO",
            new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int which) {
                    // Write your code here to invoke NO event
                    dialog.cancel();
                }
            });
    // Showing Alert Message
    alertDialog.show();
}
}

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