如何在可绘制对象中创建带有笔触的一个三角形边的矩形形状？

您可以像这样使用vector drawable

    <?xml version="1.0" encoding="utf-8"?>
<vector xmlns:android="http://schemas.android.com/apk/res/android"
android:width="200dp"
android:height="200dp"
android:viewportWidth="200"
android:viewportHeight="200">

<path
    android:fillColor="#ffffff"
    android:pathData="M7.5 131.61L138.5 128.88L187.87 97.48L138.5 67.2L7.5 67.2L7.5 131.61Z" />
<path
    android:fillColor="#000000"
    android:fillAlpha="0"
    android:strokeColor="#152dbe"
    android:strokeWidth="3"
    android:pathData="M7.5 131.61L138.5 128.88L187.87 97.48L138.5 67.2L7.5 67.2L7.5 131.61Z" />