一个类似抖音 APP 拍摄按钮效果的控件

<net.angrycode.library.TouchButton
android:id="@+id/touch_btn"
android:layout_width="85dp"
android:layout_height="85dp"
android:layout_centerInParent="true"
app:tb_anim_padding="14dp"
app:tb_color="@color/colorAccent"
app:tb_text="Hold" />

<declare-styleable name="TouchButton">
<attr name="tb_text" format="string|reference" />
<attr name="tb_text_color" format="color|reference" />
<attr name="tb_color" format="color|reference" />
<attr name="tb_anim_padding" format="dimension|reference" />
</declare-styleable>