@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    txt1 = (TextView) findViewById(R.id.txt1);
    txt2 = (TextView) findViewById(R.id.txt2);
    txt3 = (TextView) findViewById(R.id.txt3);
    total = (TextView) findViewById(R.id.total);
    edittext2 = (EditText) findViewById(R.id.edittext2);
    edittext3 = (EditText) findViewById(R.id.edittext3);
    calc = (Button) findViewById(R.id.calc);
    calc.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            float M = float.parseFloat;
            float V = float.parseFloat(edittext3.getText().toString());
            float ec = (M * (V * V)) / 2;
            total.setText(Float.toString(ec));
        }
    })

;}