CODEWITHSUNDEEP
androidtextviewtogglebutton
JJJollyjim
JJJollyjim

Reputation: 6207

"Cannot cast TextView to ToggleButton", but it is a ToggleButton

I am very new to Android development, so I appologise in advance if this is a "noobish" question.

Using a RelativeLayout, I have a ToggleButton with an ID of reminderToggle:

<ToggleButton
    android:id="@+id/reminderToggle"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignBaseline="@+id/reminderDesc"
    android:layout_alignBottom="@+id/reminderDesc"
    android:layout_toRightOf="@+id/imageView1"
    android:text="ToggleButton" />

I am using:

ToggleButton reminderToggle = (ToggleButton)findViewById(R.id.reminderToggle);

then later:

if(reminderToggle.isChecked()) {

inside a button onClick listener, inside of onCreate, to see of the ToggleButton is checked. This was all working fine. I don't know what I did, but now the app crashes when the button is clicked. In LogCat`, I can see

FATAL EXCEPTION: main
java.lang.ClassCastException: android.widget.TextView cannot be cast to android.widget.ToggleButton
at nz.co.kwiius.park.ParkActivity$4.onClick(ParkActivity.java:139)

Line 139 is:

ToggleButton reminderToggle = (ToggleButton)findViewById(R.id.reminderToggle);

As you can see in the XML, reminderToggle is a ToggleButton. So what's all this fuss about? :)

Thanks in advance, JJ56

PS: There is only one thing with id of reminderToggle, which is this ToggleButton

Upvotes: 1

Views: 1853

Answers (2)

Sunil Kumar Sahoo
Sunil Kumar Sahoo

Reputation: 53657

If you have defined a TextView prior to ToggleButton and both are defined with same id then in that case if you try to get the togglebutton tou wil get class cast exception because findViewById() will return you the first element defined using the same id in that xml. In the following XML the first element defined with id reminderToggle is TextView. SO you can't get ToggleButton using that id

ToggleButton reminderToggle = (ToggleButton)findViewById(R.id.reminderToggle);// will result you classcast exception for the following xml

XML

<TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello" 
        android:id="@+id/reminderToggle" />"
    <ToggleButton
    android:id="@+id/reminderToggle"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"

    android:text="ToggleButton" />

Upvotes: 0

san
san

Reputation: 1835

Clean and rebuild it dude. Also make sure you check build automatically always to avoid such problems.

Upvotes: 7

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