增加xapk安装，未成功

app/src/main/java/com/example/mir4updater/utils/FileUtils.java

@@ -0,0 +1,12 @@
+package com.example.mir4updater.utils;
+
+import java.io.File;
+
+public class FileUtils {
+    public static String getFileNoExName(String filePath) {
+
+        String fileNameEx = filePath.substring(filePath.lastIndexOf(File.separator) + 1);
+        String fileName = fileNameEx.substring(0,fileNameEx.lastIndexOf("."));
+        return fileName;
+    }
+}