本类继承自ImageView，可以用于设置图片的形状，现有圆角、圆形、扇形、环形，四种可选方式。
可以通过set或者xml来设置圆角的半径，以及扇形、环形样式的角度。
SdkVersion >= 19
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.administrator.customview.MainActivity"
android:orientation="vertical"
android:layout_gravity="center"
android:gravity="center"
>
<com.example.administrator.customview.FigureImageView
android:src="@mipmap/image1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
app:mode="circle"
/>
<com.example.administrator.customview.FigureImageView
android:src="@mipmap/image1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
app:mode="round_rect"
app:radius="30dp"/>
<com.example.administrator.customview.FigureImageView
android:src="@mipmap/image1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
app:mode="sector"
app:angle="-120"/>
<com.example.administrator.customview.FigureImageView
android:src="@mipmap/image1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
app:mode="ring"
app:angle="-120"/>
</LinearLayout>
<attr name="length" format="dimension"/>
public void setLength(float length) {
this.length = length;
}可用于设置显示图片区域的大小
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