Library project with a custom view that implements the Float Label pattern
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FloatLabel
FloatLabelExample
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README.md

AndroidFloatLabel

This repository contains an Android library project for Android 4.0+ with a custom view that implements the Float Label pattern (http://dribbble.com/shots/1254439--GIF-Float-Label-Form-Interaction) and an example project using the Float Label library. The custom View, FloatLabel, basically consists of two pieces: the EditText and the label (a TextView).

Quick Overview

Getting Started

Download the source to use it as a library project or use it directly from Maven Central in your dependencies. For example:

dependencies {
	compile 'com.iangclifton.android:floatlabel:1.0.4'
}

For most use, you can simply use the custom view in your XML layout, specifying a label to use as both the EditText hint and the label TextView with the android:hint property. Example:

<com.iangclifton.android.floatlabel.FloatLabel
    android:id="@+id/float_label_1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:hint="@string/example_label" />

You can also dynamically set the label with floatLabel.setLabel("Custom Label") or floatLabel.setLabel(R.string.custom_label). You can dynamically set the text of the EditText with floatLabel.setText(). All the typical setText variations are supported. If you want to set the text without an animation (such as if you're programmatically preparing views in onCreate), use floatLabel.setTextWithoutAnimation() (again, all the usual variations are supported).

If you need a reference to the EditText, you can call floatLabel.getEditText().

Custom Layout

If you want to specify a custom layout to use, you can do something like this:

<com.iangclifton.android.floatlabel.FloatLabel
    android:id="@+id/float_label_custom_layout_1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:hint="@string/example_label"
    android:layout="@layout/custom_float_label" />

Your custom layout should include a label TextView (id/float_label) and an EditText (id/edit_text). The custom layouts are extremely limited because the FloatLabel simply lays out the label and the EditText and ignores all other views. This is very efficient but also prevents you from creating a much more complex layout. Here's an example:

<?xml version="1.0" encoding="utf-8"?>
<merge xmlns:android="http://schemas.android.com/apk/res/android" >
    <TextView
        android:id="@id/float_label"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:lines="1"
        android:textIsSelectable="true"
        android:textAppearance="?android:attr/textAppearanceSmall" />
    <EditText
        android:id="@id/edit_text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="text|textAutoCorrect|textCapSentences|textAutoComplete" />
</merge>

Custom Animation

You can override the animations used to show and hide the label by implementing a FloatLabel.LabelAnimator and calling floatLabel.setLabelAnimator(new MyLabelAnimator());. Note that you should use the alpha property of the label to show and hide it rather than the View.setVisibility(int) method. Example:

private static class CustomLabelAnimator implements FloatLabel.LabelAnimator {
    /*package*/ static final float SCALE_X_SHOWN = 1f;
    /*package*/ static final float SCALE_X_HIDDEN = 2f;
    /*package*/ static final float SCALE_Y_SHOWN = 1f;
    /*package*/ static final float SCALE_Y_HIDDEN = 0f;

    @Override
    public void onDisplayLabel(View label) {
        final float shift = label.getWidth() / 2;
        label.setScaleX(SCALE_X_HIDDEN);
        label.setScaleY(SCALE_Y_HIDDEN);
        label.setX(shift);
        label.animate().alpha(1).scaleX(SCALE_X_SHOWN).scaleY(SCALE_Y_SHOWN).x(0f);
    }

    @Override
    public void onHideLabel(View label) {
        final float shift = label.getWidth() / 2;
        label.setScaleX(SCALE_X_SHOWN);
        label.setScaleY(SCALE_Y_SHOWN);
        label.setX(0f);
        label.animate().alpha(0).scaleX(SCALE_X_HIDDEN).scaleY(SCALE_Y_HIDDEN).x(shift);
    }
}

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