Kann nicht Symbol Methode setOnClickListener Fehler in Android

Question

Ich erhalte den folgenden Fehler finden.

MainActivity.java

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); 
    } 
} 

Answer 1

ändern

setOnClickListner 

zu

setOnClickListener 

Korrigieren Sie Ihre Eingabe

Answer 2

Ch ange setOnClickListner zu setOnClickListener

Button calcBtn = (Button) findViewById(R.id.calcBtn); 
calcBtn.setOnClickListener(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)); 
    } 

}); 

Answer 3

Ersetzen Sie Ihren Code wie

 calcBtn.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      float percentage = Float.parseFloat(percentageTxt.getText().toString()); 
      float dec = percentage/100; 
      float total = dec * Float.parseFloat(numberTxt.getText().toString()); 
      totalTextView.setText(Float.toString(total)); 
     } 
    }); 

Answer 4

Sie falsch geschrieben:

setOnClickListner 

Es sollte:

setOnClickListener