title: How to change a double to a string
body: <p>I have an app which shows a string in an EditText, this string is the result of the operation of two other doubles the user types in two different EditTexts.
  The problem is that I want the result of the operation to be shown in the third EditText, but for that it has to be a string. Therefore I change the result by the toString method.</p>
  
  <p>The problem starts here, I want the double that will be a string to have only one decimal. For that I used DecimalFormat and created the df format "#.#". And then I changed the text that would be shown in the last EditText to the new double variable with only one decimal (obviously changing it to String).</p>
  
  <pre><code>DecimalFormat df = new DecimalFormat("#.#");
  double BMI_trimmed = Double.parseDouble(df.format(BMI));
  
  final EditText BMIResult = (EditText)findViewById(R.id.BMIResult);
  BMIResult.setText(Double.toString(BMI_trimmed));
  </code></pre>
  
  <p>Here I leave you all the code of the myButtonListenerMethod:</p>
  
  <pre><code>public void myButtonListenerMethod(){
      button = (Button)findViewById(R.id.button);
  
      button.setOnClickListener(new View.OnClickListener() {
          @Override
          public void onClick(View view) {
              final EditText heighText = (EditText)findViewById(R.id.heightInput);
              String heighStr = heighText.getText().toString();
              double height = Double.parseDouble(heighStr);
  
              final EditText weighText = (EditText)findViewById(R.id.weightInput);
              String weighStr = weighText.getText().toString();
              double weight = Double.parseDouble(weighStr);
  
              double BMI = (weight)/(height*height);
  
              DecimalFormat df = new DecimalFormat("#.#");
              double BMI_trimmed = Double.parseDouble(df.format(BMI));
  
              final EditText BMIResult = (EditText)findViewById(R.id.BMIResult);
              BMIResult.setText(Double.toString(BMI_trimmed));
          }
      });
  }
  </code></pre>
  
  <p>This app runs perfectly on the AVD, I've runned it in three already. But when I run it in a real device and click the button that starts the myButtonListenerMethod, it stops working suddenly and shuts down. The Terminal gives the following error message:</p>
  
  <pre><code>E/AndroidRuntime: FATAL EXCEPTION: main
      Process: com.example.bmicalculator, PID: 19058
      java.lang.NumberFormatException: For input string: "24,2"
          at java.lang.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:1306)
  </code></pre>
  
  <p>If anyone knows what the problem is, please tell me I'll try. Honestly I don't understand why it runs in the AVD but it doesn't properly in a real device. Any idea?</p>