abstract classes to avoid to implement unnecessary methods and boilerplate code for android development

CustomAnimationListener.java

package gturedi.gist;

import android.view.animation.Animation;

public abstract class CustomAnimationListener
        implements Animation.AnimationListener {

    @Override
    public void onAnimationStart(Animation animation) {
    }

    @Override
    public void onAnimationEnd(Animation animation) {
    }

    @Override
    public void onAnimationRepeat(Animation animation) {
    }

}

CustomAnimatorListener.java

package gturedi.gist;

import android.animation.Animator;

public abstract class CustomAnimatorListener
        implements Animator.AnimatorListener {

    @Override
    public void onAnimationStart(Animator animation) {
    }

    @Override
    public void onAnimationEnd(Animator animation) {
    }

    @Override
    public void onAnimationCancel(Animator animation) {
    }

    @Override
    public void onAnimationRepeat(Animator animation) {
    }

}

CustomOnItemSelectedListener.java

package gturedi.gist;

import android.view.View;
import android.widget.AdapterView;

public abstract class CustomOnItemSelectedListener
        implements AdapterView.OnItemSelectedListener {

    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
    }

    @Override
    public void onNothingSelected(AdapterView<?> parent) {
    }

}

CustomTextWatcher.java

package gturedi.gist;

import android.text.Editable;
import android.text.TextWatcher;

public abstract class CustomTextWatcher
        implements TextWatcher {

    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
    }

    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {
    }

    @Override
    public void afterTextChanged(Editable s) {
    }

}

Test.java

EditText et = new EditText(this);
et.addTextChangedListener(new CustomTextWatcher() {
    @Override
    public void afterTextChanged(Editable s) {
        Log.w(TAG, "change: "+s);
    }
});