FloatLabelEditText

package com.homeaway.floatlabel.library;

import android.content.Context;
import android.content.res.TypedArray;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import android.widget.EditText;
import android.widget.TextView;

/**
 * Created by briangriffey on 12/18/13.
 */
public class FloatLabelEditText extends ViewGroup implements TextWatcher {

    private EditText mEditText;
    private TextView mLabel;

    public FloatLabelEditText(Context context) {
        super(context);
        init(context, null);
    }

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

    private void init(Context context, AttributeSet attrs) {
        TypedArray array = context.obtainStyledAttributes(attrs, R.styleable.FloatLabelEditText);
        int labelStyle = array.getResourceId(R.styleable.FloatLabelEditText_labelStyle, 0);

        mEditText = new EditText(context, attrs);
        mEditText.addTextChangedListener(this);
        addView(mEditText);

        mLabel = new TextView(context);
        mLabel.setText(mEditText.getHint());
        mLabel.setVisibility(View.INVISIBLE);
        if (labelStyle != 0) {
            mLabel.setTextAppearance(context, labelStyle);
        }

        addView(mLabel);

        array.recycle();
    }

    public FloatLabelEditText(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        int totalHeight = MeasureSpec.getSize(heightMeasureSpec);
        int halfHeight = totalHeight / 2;

        int mode = MeasureSpec.getMode(heightMeasureSpec);
        //yolo, be as big as you want homie
        if (mode == MeasureSpec.UNSPECIFIED) {
            mLabel.measure(widthMeasureSpec, heightMeasureSpec);
            mEditText.measure(widthMeasureSpec, heightMeasureSpec);
        } else {
            int labelHeightSpec = MeasureSpec.makeMeasureSpec(halfHeight, MeasureSpec.AT_MOST);
            mLabel.measure(widthMeasureSpec, labelHeightSpec);

            int remainingHeight = totalHeight - mLabel.getMeasuredHeight();
            int editHeightSpec = MeasureSpec.makeMeasureSpec(remainingHeight, MeasureSpec.AT_MOST);
            mEditText.measure(widthMeasureSpec, editHeightSpec);
        }
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        mLabel.layout(0, 0, mLabel.getMeasuredWidth(), mLabel.getMeasuredHeight());
        mEditText.layout(0, mLabel.getMeasuredHeight(), mEditText.getMeasuredWidth(), mLabel.getMeasuredHeight() + mEditText.getMeasuredHeight());
    }

    @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) {
        if (s.toString().length() > 0) {
            if (mLabel.getVisibility() != View.VISIBLE) {
                mLabel.setVisibility(View.VISIBLE);
                mLabel.setAlpha(0);
                mLabel.setTranslationY(mLabel.getMeasuredHeight());

                mLabel.animate().alpha(1).translationY(0).setDuration(100).start();
            }
        } else {
            mLabel.setVisibility(View.INVISIBLE);
        }
    }
}