Validating EditText for emptiness. :p

ValidatingEditText.java

package tk.saiprasadm.appswallet;

import android.content.Context;
import android.os.Bundle;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.RelativeLayout;
import android.widget.EditText;
import android.widget.Toast;

public class ValidatingEditText extends AppCompatActivity  {

    EditText et;
    Context currentView;
    Button btn;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home);
        et=(EditText)findViewById(R.id.editText1);
        btn=(Button)findViewById(R.id.btn1);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(et.getText().toString().trim().isEmpty()){
                    Toast.makeText(currentView,"Enter the text in the textfield",Toast.LENGTH_SHORT).show();
                }else{
                    //Do the database stuff
                }
            }
        });

    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int id = item.getItemId();
        switch (id) {
            case R.id.item_help:
                Toast.makeText(currentView, "Help will be called", Toast.LENGTH_SHORT).show();
                break;
            case R.id.item_settings:
                Toast.makeText(currentView, "Settings Activity will be called", Snackbar.LENGTH_SHORT).show();
                break;
            case R.id.item_add:
                Toast.makeText(currentView, "Adding Item activity", Snackbar.LENGTH_SHORT).show();
                break;
            default:
                Toast.makeText(currentView, "Nothing to show", Snackbar.LENGTH_SHORT).show();
                break;
        }
        return super.onOptionsItemSelected(item);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.menu_home, menu);
        return super.onCreateOptionsMenu(menu);
    }


}