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POR cannot be resolved to a variable
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  1. POR cannot be resolved to a variable
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    copied!<p>I would like to fix this error </p> <blockquote> <p>R cannot be resolved to a variable</p> </blockquote> <p>I looked up many answers, but I could not get the right one; I tried everything. Could any one help me?</p> <p>My main activity which is automatically created. The error is showing for the three lines starting at <code>case R.id.button1:</code>:</p> <pre><code>package de.vogella.android.temprature1; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.widget.EditText; import android.widget.RadioButton; import android.widget.Toast; public class Convert extends Activity { private EditText text; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); text = (EditText) findViewById(R.id.editText1); } // This method is called at button click because we assigned the name to the // "On Click property" of the button public void myClickHandler(View view) { switch (view.getId()) { case R.id.button1: RadioButton celsiusButton = (RadioButton) findViewById(R.id.radio0); RadioButton fahrenheitButton = (RadioButton) findViewById(R.id.radio1); if (text.getText().length() == 0) { Toast.makeText(this, "Please enter a valid number", Toast.LENGTH_LONG).show(); return; } float inputValue = Float.parseFloat(text.getText().toString()); if (celsiusButton.isChecked()) { text.setText(String.valueOf(convertFahrenheitToCelsius(inputValue))); } else { text.setText(String.valueOf(convertCelsiusToFahrenheit(inputValue))); } // Switch to the other button if (fahrenheitButton.isChecked()) { fahrenheitButton.setChecked(false); celsiusButton.setChecked(true); } else { fahrenheitButton.setChecked(true); celsiusButton.setChecked(false); } break; } } // Converts to celsius private float convertFahrenheitToCelsius(float fahrenheit) { return ((fahrenheit - 32) * 5 / 9); } // Converts to fahrenheit private float convertCelsiusToFahrenheit(float celsius) { return ((celsius * 9) / 5) + 32; } } </code></pre> <p>my main.xml</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="@color/myColor"&gt; &lt;EditText android:layout_height="wrap_content" android:id="@+id/editText1" android:layout_width="match_parent" android:inputType="numberDecimal|numberSigned"&gt;&lt;/EditText&gt; &lt;RadioGroup android:layout_height="wrap_content" android:id="@+id/radioGroup1" android:layout_width="match_parent"&gt; &lt;RadioButton android:layout_width="wrap_content" android:id="@+id/radio0" android:layout_height="wrap_content" android:text="@string/celsius" android:checked="true"&gt;&lt;/RadioButton&gt; &lt;RadioButton android:layout_width="wrap_content" android:id="@+id/radio1" android:layout_height="wrap_content" android:text="@string/fahrenheit"&gt;&lt;/RadioButton&gt; &lt;/RadioGroup&gt; &lt;Button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/calc" android:onClick="myClickHandler"&gt;&lt;/Button&gt; &lt;/LinearLayout&gt; </code></pre> <p>my string.xml</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;resources&gt; &lt;string name="hello"&gt;Hello World, Convert!&lt;/string&gt; &lt;string name="app_name"&gt;de.vogella.android.temprature1&lt;/string&gt; &lt;string name="myClickHandler"&gt;myClickHandler&lt;/string&gt; &lt;string name="celsius"&gt;to Celsius&lt;/string&gt; &lt;string name="farenheit"&gt;to Farenheit&lt;/string&gt; &lt;string name="calc"&gt;Calculate&lt;/string&gt; &lt;/resources&gt; </code></pre>
 

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