Extending a EditText in Android. What am I doing wrong?

Question

So I\'m trying to get a grasp of using custom controls in Android. But my app crashes on trying to create the activity. Here\'s the code:

package com.myApp;
         


        

Answer 1

You will need to implement these constructors:

public class TestEditText extends EditText {
    public TestEditText(Context context) {
        super(context);
    }

    public TestEditText(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public TestEditText(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    public TestEditText(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
    }
}

for example try to do the following :

public TestEditText(Context context, AttributeSet attrs) {
    super(context, attrs);
    Log.i("attribute name at index 0", attrs.getAttributeName(0));
}

you will get the following in your logcat :

attribute name at index 0 = id 

so to deliver these XML attributes to the Super class (EditText) you have to override these constructors.

Hope that Helps.