java.lang.ClassCastException：android.widget.TextView无法转换为android.widget.EditText

Question

I'm getting the following Error:

java.lang.ClassCastException: android.widget.TextView cannot be cast to android.widget.EditText at com.example.bmicalculator.MainActivity.initializeApp(MainActivity.java.32)

Main Activity:

public class MainActivity extends Activity {

private EditText heightIn;
private EditText weightIn;
private Button CalculateButton;
private double weight =0;
private double height =0;
private TextView BmiResult;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initializeApp();
    }

    private void initializeApp() {
        heightIn = (EditText) findViewById (R.id.HeightInput1);
        weightIn = (EditText) findViewById (R.id.WeightInput1);
        CalculateButton = (Button) findViewById (R.id.CalculateButton);
        BmiResult = (TextView) findViewById (R.id.BmiResult);

    }

    public void calculateBMI(View v) {
        weight = Double.parseDouble(weightIn.getText().toString());
        height = Double.parseDouble(heightIn.getText().toString());
        double bmi = (weight / (height * height));
        String result = String.format("%.2f", bmi);
        Log.d("MyActivity", result);
        BmiResult.setText(result, TextView.BufferType.NORMAL);
    }
}

XML File:

<LinearLayout xmlns:tools="http://schemas.android.com/tools"
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/LinearLayout2"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
tools:context="${relativePackage}.${activityClass}" >

<TextView
    android:id="@+id/HeightInput1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/HeightInput"
    android:textAppearance="?android:attr/textAppearanceMedium" />

<EditText
    android:id="@+id/editText1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:ems="10"
    android:hint="@string/InchesHint"
    android:inputType="numberDecimal" >

    <requestFocus />
</EditText>

<TextView
    android:id="@+id/WeightInput1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/WeightInput"
    android:textAppearance="?android:attr/textAppearanceMedium" />

<EditText
    android:id="@+id/editText2"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:ems="10"
    android:hint="@string/PoundsHint"
    android:inputType="numberDecimal" />

<Button
    android:id="@+id/CalculateButton"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:onClick="calculateBMI"
    android:text="@string/CalculateButton" />

<TextView
    android:id="@+id/BmiResult"
    android:layout_width="100dp"
    android:layout_height="0dp"
    android:layout_weight="0.00"
    android:text="@string/BmiResult" />

Answer 1

Your heightIn is not EditText and you're trying to cast it as EditText so you got Error

java.lang.ClassCastException: android.widget.TextView cannot be cast to android.widget.EditText at com.example.bmicalculator.MainActivity.initializeApp(MainActivity.java.32)

so do as,

heightIn = (TextView) findViewById (R.id.HeightInput1);
weightIn = (TextView) findViewById (R.id.WeightInput1);

Answer 2

Change this:

<TextView
    android:id="@+id/HeightInput1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/HeightInput"
    android:textAppearance="?android:attr/textAppearanceMedium" />

<TextView
    android:id="@+id/WeightInput1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/WeightInput"
    android:textAppearance="?android:attr/textAppearanceMedium" />

Via

<EditText
    android:id="@+id/HeightInput1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/HeightInput"
    android:textAppearance="?android:attr/textAppearanceMedium" />

<EditText
    android:id="@+id/WeightInput1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/WeightInput"
    android:textAppearance="?android:attr/textAppearanceMedium" />

OR

heightIn = (EditText) findViewById (R.id.HeightInput1);
weightIn = (EditText) findViewById (R.id.WeightInput1);

via

heightIn = (TextView) findViewById (R.id.HeightInput1);
weightIn = (TextView) findViewById (R.id.WeightInput1);

Answer 3

in java file

heightIn = (EditText) findViewById (R.id.HeightInput1);

and

in xml file

<TextView
    android:id="@+id/HeightInput1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/HeightInput"
    android:textAppearance="?android:attr/textAppearanceMedium" />

So change according to your requirement.

Answer 4

1. There are two possibilities, HeightInput1 id component should be Edit text not a text view
2. else In code change the Edit text to Text view whose id is HeightInput1

so change java code with this

    heightIn = (TextView) findViewById (R.id.HeightInput1);  
    weightIn = (TextView) findViewById (R.id.WeightInput1);

else change in xml file with this

  <EditText
   android:id="@+id/HeightInput1"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="@string/HeightInput"
   android:textAppearance="?android:attr/textAppearanceMedium" />

Answer 5

In Xml file you are declare as TextView and you are trying to parse TextView to EditText that's why you are getting an Exception.

Change EditText Variable

private EditText heightIn;
private EditText weightIn;

To

private TextView heightIn;
private TextView weightIn;

And replace your initializeApp() function with:

private void initializeApp() {
    heightIn = (TextView) findViewById (R.id.HeightInput1);
    weightIn = (TextView) findViewById (R.id.WeightInput1);
    CalculateButton = (Button) findViewById (R.id.CalculateButton);
    BmiResult = (EditText) findViewById (R.id.BmiResult);

}

Answer 6

 heightIn = (EditText) findViewById (R.id.HeightInput1);

Here you mentioned heightIn as EditTect and in your layout.xml it is as TextView,
instead of finding "HeightInput1" which is just your text to label, it should find the EditText

 heightIn = (EditText) findViewById (R.id.EditText1);   

same with the weight input... good luck!