android support! thanks to TachiWeb devs.

AndroidCompat/src/main/java/xyz/nulldev/androidcompat/pm/InstalledPackage.kt

@@ -0,0 +1,93 @@
+package xyz.nulldev.androidcompat.pm
+
+import android.content.pm.PackageInfo
+import android.content.pm.Signature
+import android.os.Bundle
+import com.android.apksig.ApkVerifier
+import com.googlecode.d2j.dex.Dex2jar
+import net.dongliu.apk.parser.ApkFile
+import net.dongliu.apk.parser.ApkParsers
+import org.w3c.dom.Element
+import org.w3c.dom.Node
+import org.w3c.dom.NodeList
+import java.io.File
+import javax.imageio.ImageIO
+import javax.xml.parsers.DocumentBuilderFactory
+
+
+
+data class InstalledPackage(val root: File) {
+    val apk = File(root, "package.apk")
+    val jar = File(root, "translated.jar")
+    val icon = File(root, "icon.png")
+
+    val info: PackageInfo
+        get() = ApkParsers.getMetaInfo(apk).toPackageInfo(root, apk).also {
+            val parsed = ApkFile(apk)
+            val dbFactory = DocumentBuilderFactory.newInstance()
+            val dBuilder = dbFactory.newDocumentBuilder()
+            val doc = parsed.manifestXml.byteInputStream().use {
+                dBuilder.parse(it)
+            }
+
+            it.applicationInfo.metaData = Bundle().apply {
+                val appTag = doc.getElementsByTagName("application").item(0)
+
+                appTag?.childNodes?.toList()?.filter {
+                    it.nodeType == Node.ELEMENT_NODE
+                }?.map {
+                    it as Element
+                }?.filter {
+                    it.tagName == "meta-data"
+                }?.map {
+                    putString(it.attributes.getNamedItem("android:name").nodeValue,
+                            it.attributes.getNamedItem("android:value").nodeValue)
+                }
+            }
+
+            it.signatures = (parsed.apkSingers.flatMap { it.certificateMetas }
+                    /*+ parsed.apkV2Singers.flatMap { it.certificateMetas }*/) // Blocked by: https://github.com/hsiafan/apk-parser/issues/72
+                    .map { Signature(it.data) }.toTypedArray()
+        }
+
+    fun verify(): Boolean {
+        val res = ApkVerifier.Builder(apk)
+                .build()
+                .verify()
+
+        return res.isVerified
+    }
+
+    fun writeIcon() {
+        try {
+            val icons = ApkFile(apk).allIcons
+
+            val read = icons.filter { it.isFile }.map {
+                it.data.inputStream().use {
+                    ImageIO.read(it)
+                }
+            }.sortedByDescending { it.width * it.height }.firstOrNull() ?: return
+
+            ImageIO.write(read, "png", icon)
+        } catch(e: Exception) {
+            icon.delete()
+        }
+    }
+
+    fun writeJar() {
+        try {
+            Dex2jar.from(apk).to(jar.toPath())
+        } catch(e: Exception) {
+            jar.delete()
+        }
+    }
+
+    private fun NodeList.toList(): List<Node> {
+        val out = mutableListOf<Node>()
+
+        for(i in 0 until length)
+            out += item(i)
+
+        return out
+    }
+}