title: Cannot find symbol method setOnClickListener error in Android
body: <p>I am getting the following error:</p>
  
  <blockquote>
    <p>"Error:(35, 16) error: cannot find symbol method setOnClickListner()"</p>
  </blockquote>
  
  <p>When I run my android program from android studio. </p>
  
  <p><strong>MainActivity.java</strong></p>
  
  <pre><code>package com.optechsoft.pos;
  
  import android.os.Bundle;
  import android.support.design.widget.FloatingActionButton;
  import android.support.design.widget.Snackbar;
  import android.support.v7.app.AppCompatActivity;
  import android.support.v7.widget.Toolbar;
  import android.view.View;
  import android.view.Menu;
  import android.view.MenuItem;
  import android.widget.Button;
  import android.widget.EditText;
  import android.widget.TextView;
  
  public class MainActivity extends AppCompatActivity {
  
      TextView totalTextView;
      EditText percentageTxt;
      EditText numberTxt;
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main);
          Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
          setSupportActionBar(toolbar);
  
          totalTextView = (TextView) findViewById(R.id.totalTextview);
          percentageTxt = (EditText) findViewById(R.id.percentageTxt);
          numberTxt = (EditText) findViewById(R.id.numberTxt);
  
          Button calcBtn = (Button) findViewById(R.id.calcBtn);
          calcBtn.setOnClickListner(new View.OnClickListener(){
             @Override
              public void onClick (View view) {
                  float percentage = Float.parseFloat(percentageTxt.getText().toString());
                  float dec = percentage / 100;
                  float total = dec * Float.parseFloat(numberTxt.getText().toString());
                  totalTextView.setText(Float.toString(total));
             }
  
          });
      }
  
      @Override
      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;
      }
  
      @Override
      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);
      }
  }
  </code></pre>