自定义 随意拖动 + 吸边 + 半隐藏 布局，继承自 RelativeLayout ，可装载任何子控件
属性：
<declare-styleable name="ZFloatActionLayout">
//吸边模式
//none: 默认模式没有吸边
//both: X轴和Y轴同时吸边
//unilateral: 单边模式，X轴和Y轴哪个轴距离边界近就吸哪个轴
//adsorbX: 只有X轴吸边
//adsorbY: 只有Y轴吸边
<attr name="ZFloatActionLayout_adsorbMode" format="enum">
<enum name="none" value="0"/>
<enum name="both" value="1"/>
<enum name="unilateral" value="2"/>
<enum name="adsorbX" value="3"/>
<enum name="adsorbY" value="4"/>
</attr>
//X轴吸边之后与边缘的距离
<attr name="ZFloatActionLayout_adsorbXMargin" format="dimension"/>
//Y轴吸边之后与边缘的距离
<attr name="ZFloatActionLayout_adsorbYMargin" format="dimension"/>
//是否开启半隐藏
<attr name="ZFloatActionLayout_isHalfHidden" format="boolean"/>
//显示多少时间后进行隐藏（单位：毫秒）
<attr name="ZFloatActionLayout_displayDuration" format="integer"/>
//计时间隔（单位：毫秒）
<attr name="ZFloatActionLayout_displayStep" format="integer"/>
</declare-styleable>
使用：
<com.zhumj.zfloatactionlayout.ZFloatActionLayout
android:layout_width="60dp"
android:layout_height="60dp"
app:ZFloatActionLayout_adsorbMode="none"
app:ZFloatActionLayout_adsorbXMargin="12dp"
app:ZFloatActionLayout_adsorbYMargin="12dp"
app:ZFloatActionLayout_isHalfHidden="true"
app:ZFloatActionLayout_displayDuration="10000"
app:ZFloatActionLayout_displayStep="1000"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintBottom_toBottomOf="parent">
<Button
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/shape_button_bg"
android:onClick="onButtonClick"
android:textColor="@android:color/white"
android:textSize="13sp"
android:gravity="center"
android:textAllCaps="false"
android:text="none"/>
</com.zhumj.zfloatactionlayout.ZFloatActionLayout>
<com.zhumj.zfloatactionlayout.ZFloatActionLayout
android:layout_width="60dp"
android:layout_height="60dp"
app:ZFloatActionLayout_adsorbMode="both"
app:ZFloatActionLayout_adsorbXMargin="12dp"
app:ZFloatActionLayout_adsorbYMargin="12dp"
app:ZFloatActionLayout_isHalfHidden="true"
app:ZFloatActionLayout_displayDuration="10000"
app:ZFloatActionLayout_displayStep="1000"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintBottom_toBottomOf="parent">
<Button
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/shape_button_bg"
android:onClick="onButtonClick"
android:textColor="@android:color/white"
android:textSize="13sp"
android:gravity="center"
android:textAllCaps="false"
android:text="both"/>
</com.zhumj.zfloatactionlayout.ZFloatActionLayout>
<com.zhumj.zfloatactionlayout.ZFloatActionLayout
android:layout_width="60dp"
android:layout_height="60dp"
app:ZFloatActionLayout_adsorbMode="unilateral"
app:ZFloatActionLayout_adsorbXMargin="12dp"
app:ZFloatActionLayout_adsorbYMargin="12dp"
app:ZFloatActionLayout_isHalfHidden="true"
app:ZFloatActionLayout_displayDuration="10000"
app:ZFloatActionLayout_displayStep="1000"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintBottom_toBottomOf="parent">
<Button
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/shape_button_bg"
android:onClick="onButtonClick"
android:textColor="@android:color/white"
android:textSize="13sp"
android:gravity="center"
android:textAllCaps="false"
android:text="unilateral"/>
</com.zhumj.zfloatactionlayout.ZFloatActionLayout>
<com.zhumj.zfloatactionlayout.ZFloatActionLayout
android:layout_width="60dp"
android:layout_height="60dp"
app:ZFloatActionLayout_adsorbMode="adsorbX"
app:ZFloatActionLayout_adsorbXMargin="12dp"
app:ZFloatActionLayout_adsorbYMargin="12dp"
app:ZFloatActionLayout_isHalfHidden="true"
app:ZFloatActionLayout_displayDuration="10000"
app:ZFloatActionLayout_displayStep="1000"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintBottom_toBottomOf="parent">
<Button
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/shape_button_bg"
android:onClick="onButtonClick"
android:textColor="@android:color/white"
android:textSize="13sp"
android:gravity="center"
android:textAllCaps="false"
android:text="adsorbX"/>
</com.zhumj.zfloatactionlayout.ZFloatActionLayout>
<com.zhumj.zfloatactionlayout.ZFloatActionLayout
android:layout_width="60dp"
android:layout_height="60dp"
app:ZFloatActionLayout_adsorbMode="adsorbY"
app:ZFloatActionLayout_adsorbXMargin="12dp"
app:ZFloatActionLayout_adsorbYMargin="12dp"
app:ZFloatActionLayout_isHalfHidden="true"
app:ZFloatActionLayout_displayDuration="10000"
app:ZFloatActionLayout_displayStep="1000"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintBottom_toBottomOf="parent">
<Button
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/shape_button_bg"
android:onClick="onButtonClick"
android:textColor="@android:color/white"
android:textSize="13sp"
android:gravity="center"
android:textAllCaps="false"
android:text="adsorbY"/>
</com.zhumj.zfloatactionlayout.ZFloatActionLayout>
