Add hide Magisk Manager feature

unhide/.gitignore

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+/build

unhide/build.gradle

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+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion 26
+    buildToolsVersion "26.0.1"
+    defaultConfig {
+        applicationId "com.topjohnwu.unhide"
+        minSdkVersion 21
+        targetSdkVersion 26
+        versionCode 1
+        versionName "1.0"
+    }
+    buildTypes {
+        release {
+            shrinkResources true
+            minifyEnabled true
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+        }
+    }
+}
+
+dependencies {
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+    implementation project(':resource')
+}

unhide/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# By default, the flags in this file are appended to flags specified
+# in /Users/topjohnwu/Library/Android/sdk/tools/proguard/proguard-android.txt
+# You can edit the include path and order by changing the proguardFiles
+# directive in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# Add any project specific keep options here:
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

unhide/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.topjohnwu.unhide">
+
+    <application
+        android:icon="@mipmap/ic_launcher"
+        android:label="Unhide Magisk Manager"
+        android:theme="@android:style/Theme.NoDisplay">
+        <activity android:name=".MainActivity">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

unhide/src/main/java/com/topjohnwu/unhide/MainActivity.java

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+package com.topjohnwu.unhide;
+
+import android.app.Activity;
+import android.os.Bundle;
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.util.Locale;
+
+public class MainActivity extends Activity {
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        String command = String.format(
+                "pm unhide com.topjohnwu.magisk\n" +
+                "am start -n com.topjohnwu.magisk/.SplashActivity\n" +
+                "pm uninstall %s\n" +
+                "exit\n",
+                getApplicationInfo().packageName);
+        Process process;
+        try {
+            process = Runtime.getRuntime().exec("su");
+            OutputStream in = process.getOutputStream();
+            in.write(command.getBytes("UTF-8"));
+            in.flush();
+            process.waitFor();
+        } catch (IOException | InterruptedException e) {
+            e.printStackTrace();
+        }
+        finish();
+    }
+}