I am working on the Layout of my main activity with Android Studio (lowest API is 15), and have defined a few XML Buttons on it.
The idea of the program is to edit a list of words by adding to, displaying, and clearing it with a set of buttons. (There is an EditText for adding, but that's not important for the question). But with the idea of high cohesion in mind, I have defined this list and the methods that manipulate it in another plain class called WordList (which still extends Activity), and so when trying to invoke the onClick property of a button, it cannot find them.
android:onClick="addWord"
Method 'addWord' is missing in 'MainActivity' or has incorrect signature...
Is there a way to make the layout, or the individual element point (or get its data context) from another class, or is that against the whole structure of Android and I should just put it in its original activity?
Are you using the correct signature for the method?
Methods defines using the onClick attribute must meet the following requirements:
- must be public
- must have a void return value
- must have a View object as parameter (which is the view that was clicked)
like
public void addWord(View view) { //your action }
Add an OnClickListener to the button instead of using the XML onClick attribute.
https://stackoverflow.com/a/29479937/1496693
Try this, it should work:
Button btn = (Button) findViewById(R.id.mybutton); btn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { addWord(v); } }); // some more code public void addWord(View v) { // does something very interesting }
XML Implementation
<?xml version="1.0" encoding="utf-8"?> <!-- layout elements --> <Button android:id="@+id/mybutton" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Click me!" android:onClick="addWord" /> <!-- even more layout elements -->
