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;
import android.content.Context;
import android.widget.EditText;
import android.view.View;
import android.view.View.OnClickListener;

public class MyEditText extends EditText implements OnClickListener {

    public MyEditText(Context context) {
        super(context);
        // TODO Auto-generated constructor stub
    }   
    public void FlashBorder()
    {
        //do some custom action
    }
    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        EditText txt = (EditText) v;
        txt.selectAll();
    }
}

Here's the layout xml:

<com.myApp.MyEditText
     android:id="@+id/edtTaskName"
     android:layout_height="wrap_content"
     android:layout_width="match_parent"/>

check this url :: http://stackoverflow.com/questions/2026873/android-way-to-appear-bordered-text-on-the-textview — Samir Mangroliya, Oct 04 '11 at 13:52

Fernando Gallego · Accepted Answer · 2017-03-20T14:32:32.060

19

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.

edited Mar 20 '17 at 14:32

answered Oct 04 '11 at 14:07

Fernando Gallego

4,064
31
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2

Thank you! I wish I could at least get an indication of the what is the error about from the compiler or runtime. But the Eclipse just stopped in the middle of some internal method call without any exception info, no error, nothing. – taralex Oct 04 '11 at 15:26
The xml attributes are in the AtributeSet attrs so it is necessary to implement them :) – Fernando Gallego May 31 '12 at 14:19
`Error inflating class CustomEditText` ... doesn't work for me ... :-/ – Stefan Brendle Aug 06 '16 at 15:13
@StefanBrendle have you implemented all constructors? there might be 4 depending on the android version – Fernando Gallego Aug 07 '16 at 17:05
I had to set the class path in the layout xml file, then it worked :) – Stefan Brendle Aug 07 '16 at 19:55

score 2 · Answer 2 · answered Oct 04 '11 at 13:58

You have to add this constructor for creating any custom View.

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

instead of

public MyEditText(Context context) {
        super(context);
        // TODO Auto-generated constructor stub
    }

score 1 · Answer 3 · answered Oct 03 '16 at 08:54

import android.annotation.TargetApi;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Typeface;
import android.os.Build;
import android.util.AttributeSet;




/**
 * Created by rohann on 14/07/2016.
 */
public class LightEditText extends android.widget.EditText{

    public LightEditText(Context context) {
        super(context);
        setFont();

    }

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

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

    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    public LightEditText(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
        setFont();
    }

    /**
     * This method is used to set the given font to the TextView.
     */
    private void setFont() {
        Typeface typeface = TypefaceCache.get(getContext().getAssets(), "fonts/Roboto-Light.ttf");
        setTypeface(typeface);
    }

    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
    }
}

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

3 Answers3

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