First commit, basic working app for Android > 7 (bad UX on lower versions)

app/build.gradle

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+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion 29
+    buildToolsVersion "21.1.0"
+
+    defaultConfig {
+        applicationId "org.eu.octt.browserocto"
+        minSdkVersion 1
+        targetSdkVersion 29
+        versionCode 1
+        versionName "1.0.0"
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+        }
+    }
+}
+
+dependencies {
+	//compile fileTree(dir: 'libs', include: ['*.jar'])
+}

app/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 C:\tools\adt-bundle-windows-x86_64-20131030\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 *;
+#}

app/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="org.eu.octt.browserocto">
+	<uses-permission android:name="android.permission.INTERNET"/>
+	<uses-permission android:name="com.android.launcher.permission.INSTALL_SHORTCUT"/>
+	<application
+		android:allowBackup="true"
+		android:usesCleartextTraffic="true"
+		android:icon="@drawable/ic_launcher"
+		android:label="@string/app_name"
+		android:theme="@style/AppTheme"
+		android:resizeableActivity="true">
+		<activity
+			android:name=".MainActivity"
+			android:label="@string/app_name">
+			<intent-filter>
+				<action android:name="android.intent.action.MAIN" />
+				<category android:name="android.intent.category.LAUNCHER"/>
+			</intent-filter>
+			<intent-filter>
+				<action android:name="android.intent.action.CREATE_SHORTCUT"/>
+				<category android:name="android.intent.category.DEFAULT"/>
+			</intent-filter>
+		</activity>
+		<activity
+			android:name=".WebWindowActivity"
+			android:label="@string/app_name"
+			android:exported="true">
+		</activity>
+	</application>
+</manifest>

app/src/main/java/org/eu/octt/browserocto/MainActivity.java

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+package org.eu.octt.browserocto;
+
+import android.app.*;
+import android.content.*;
+import android.os.*;
+import android.widget.*;
+import android.view.View.*;
+import android.view.*;
+import android.net.*;
+import android.content.pm.*;
+import android.graphics.drawable.*;
+
+public class MainActivity extends Activity {
+	@Override
+	protected void onCreate(Bundle savedInstanceState) {
+		super.onCreate(savedInstanceState);
+		setContentView(R.layout.main);
+		
+		final LinearLayout LayMain = findViewById(R.id.LayMain);
+		final EditText EditUrl = findViewById(R.id.EditUrl);
+		final Button BtnOpen = findViewById(R.id.BtnOpen);
+		final Button BtnShortcut = findViewById(R.id.BtnShortcut);
+		final Switch SwitchCache = findViewById(R.id.SwitchCache);
+		
+		BtnOpen.setOnClickListener(new OnClickListener() {
+			@Override
+			public void onClick(View v) {
+				String Url = EditUrl.getText().toString();
+				if (_Util.IsUrlValid(Url)) {
+					startActivity(MakeIntBrowse(Url, SwitchCache.isChecked()));
+				} else {
+					_Util.ToastMsg("URL is invalid!", getApplicationContext());
+				};
+			};
+		});
+		
+		BtnShortcut.setOnClickListener(new OnClickListener() {
+			@Override
+			public void onClick(View v) {
+				String Url = EditUrl.getText().toString();
+				if (_Util.IsUrlValid(Url)) {
+					ShowShortcutDial(Url);
+				} else {
+					_Util.ToastMsg("URL is invalid!", getApplicationContext());
+				};
+			};
+		});
+	};
+	
+	private Intent MakeIntBrowse(String Url, Boolean Cache) {
+		Intent IntBrowse = new Intent(getApplicationContext(), WebWindowActivity.class);
+		// To get unlimited activities in general but only 1 per site, set only FLAG_ACTIVITY_NEW_DOCUMENT and put site URL in intent.setData
+		// NOTE: This only gives a good UX on Android >= 7, for the lower versions we need to implement things differently
+		IntBrowse
+			.setAction(Intent.ACTION_OPEN_DOCUMENT)
+			.setData(Uri.parse(Url))
+			.addFlags(Intent.FLAG_ACTIVITY_NEW_DOCUMENT /*| Intent.FLAG_ACTIVITY_MULTIPLE_TASK*/)
+			.putExtra("Url", Url)
+			.putExtra("Cache", Cache);
+		return IntBrowse;
+	};
+	
+	private final void CreateShortcut(String Url, String Name) {
+		// https://stackoverflow.com/a/51184905
+		if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
+			ShortcutManager ShortMan = getApplicationContext().getSystemService(ShortcutManager.class);
+			if (ShortMan != null) {
+				if (ShortMan.isRequestPinShortcutSupported()) {
+					ShortcutInfo shortcut = new ShortcutInfo.Builder(getApplicationContext(), Url) 
+						.setShortLabel(Name)
+						//.setLongLabel("Open the Android Document")
+						.setIcon(Icon.createWithResource(getApplicationContext(), R.drawable.ic_launcher)) // TODO Get site icon, or let user pick
+						//.setIcon(IconFromUrlElseDefault(Url))
+						.setIntent(MakeIntBrowse(Url, true))
+						.build();
+					ShortMan.requestPinShortcut(shortcut, null);
+				} else {
+					CreateShortcutFallback(Url, Name);
+				};
+			};
+		} else {
+			CreateShortcutFallback(Url, Name);
+		};
+	};
+	
+	private final void CreateShortcutFallback(String Url, String Name) {
+		Intent IntExt = new Intent();
+		IntExt.putExtra(Intent.EXTRA_SHORTCUT_INTENT, MakeIntBrowse(Url, true));
+		IntExt.putExtra(Intent.EXTRA_SHORTCUT_NAME, Name);
+		IntExt.putExtra(Intent.EXTRA_SHORTCUT_ICON_RESOURCE, Intent.ShortcutIconResource.fromContext(getApplicationContext(), R.drawable.ic_launcher));
+
+		IntExt.setAction("com.android.launcher.action.INSTALL_SHORTCUT");
+		//IntExt.putExtra("duplicate", false);  //may it's already there so don't duplicate
+		getApplicationContext().sendBroadcast(IntExt);
+	};
+
+	
+	private void ShowShortcutDial(String Url) {
+		final AlertDialog.Builder Dial = new AlertDialog.Builder(this);
+		final String Url_ = Url;
+		
+		final View v = getLayoutInflater().inflate(R.layout.dialmakeshortcut, null);
+		Dial.setView(v);
+		
+		final EditText EditName = v.findViewById(R.id.EditName);
+		//final EditText EditIcon = v.findViewById(R.id.EditIcon);
+		
+		Dial.setTitle("Create Home Shortcut");
+		//Dial.setCancelable(false);
+		
+		Dial.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
+			@Override
+			public void onClick(DialogInterface d, int w) {
+				final String Name = EditName.getText().toString();
+				//String IconUrl = EditIcon.getText().toString();
+				if (!Name.equals("")) {
+					CreateShortcut(Url_, Name);
+				} else
+				if (Name.equals("")) {
+					_Util.ToastMsg("Name can't be empty!", getApplicationContext());
+				};
+			};
+		});
+		
+		Dial.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
+			@Override
+			public void onClick(DialogInterface d, int w) {
+				
+			};
+		});
+
+		Dial.show();
+	};
+};

app/src/main/java/org/eu/octt/browserocto/WebWindowActivity.java

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+package org.eu.octt.browserocto;
+
+import android.app.*;
+import android.content.*;
+import android.os.*;
+import android.webkit.*;
+import android.widget.*;
+
+public class WebWindowActivity extends Activity {
+	@Override
+	protected void onCreate(Bundle savedInstanceState) {
+		super.onCreate(savedInstanceState);
+		setContentView(R.layout.webwindow);
+		
+		Bundle Extra = getIntent().getExtras();
+		LinearLayout LayMain = findViewById(R.id.LayMain);
+		
+		WebView Web0 = findViewById(R.id.Web0);
+		Web0.setWebViewClient(new WebViewClient());
+		Web0.getSettings().setJavaScriptEnabled(true);
+		Web0.getSettings().setDomStorageEnabled(true);
+		Web0.getSettings().setCacheMode(WhichCacheMode(Extra.getBoolean("Cache")));
+		Web0.loadUrl(Extra.getString("Url"));
+		
+		_Util.ToastMsg(Extra.getString("Url"), getApplicationContext());
+	};
+	
+	public int WhichCacheMode(boolean Opt) {
+		if (Opt) {
+			return WebSettings.LOAD_CACHE_ELSE_NETWORK;
+		};
+		return WebSettings.LOAD_NO_CACHE;
+	};
+};

app/src/main/java/org/eu/octt/browserocto/_Util.java

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+package org.eu.octt.browserocto;
+
+import android.app.*;
+import android.content.*;
+import android.widget.*;
+
+public class _Util extends Activity {
+	public static void ToastMsg(String Msg, Context c) {
+		Toast.makeText(c, Msg, Toast.LENGTH_SHORT).show();
+	};
+	
+	public static boolean IsUrlValid(String Url) {
+		Url = Url.toLowerCase();
+		if (
+			(Url.startsWith("file://") || Url.startsWith("http://") || Url.startsWith("https://"))
+		&& !(Url.equals("file://") || Url.equals("http://") || Url.equals("https://"))
+		) {
+			return true;
+		};
+		return false;
+	};
+};

app/src/main/res/layout/dialmakeshortcut.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout
+	xmlns:android="http://schemas.android.com/apk/res/android"
+	android:layout_width="fill_parent"
+	android:layout_height="fill_parent"
+	android:orientation="vertical"
+	android:id="@+id/LayMain"
+	android:gravity="center_horizontal">
+
+	<LinearLayout
+		android:orientation="horizontal"
+		android:layout_width="wrap_content"
+		android:layout_height="wrap_content"
+		android:padding="10dp">
+
+		<!--
+		<Button
+			android:layout_width="wrap_content"
+			android:layout_height="wrap_content"
+			android:text="Reset Name"
+			android:padding="10dp"/>
+		-->
+
+		<EditText
+			android:layout_width="wrap_content"
+			android:ems="10"
+			android:layout_height="wrap_content"
+			android:id="@+id/EditName"
+			android:padding="10dp"
+			android:hint="Name..."/>
+
+	</LinearLayout>
+
+	<!--
+	<LinearLayout
+		android:orientation="horizontal"
+		android:layout_width="wrap_content"
+		android:layout_height="wrap_content"
+		android:padding="10dp">
+
+		<Button
+			android:layout_width="wrap_content"
+			android:layout_height="wrap_content"
+			android:text="Reset Icon URL"
+			android:padding="10dp"/>
+
+		<EditText
+			android:layout_width="wrap_content"
+			android:ems="10"
+			android:layout_height="wrap_content"
+			android:id="@+id/EditIcon"
+			android:padding="10dp"/>
+
+	</LinearLayout>
+	-->
+
+</LinearLayout>

app/src/main/res/layout/main.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout
+	xmlns:android="http://schemas.android.com/apk/res/android"
+	android:layout_width="match_parent"
+	android:layout_height="match_parent"
+	android:gravity="center"
+	android:orientation="vertical"
+	android:id="@+id/LayMain">
+
+	<EditText
+		android:layout_width="match_parent"
+		android:ems="10"
+		android:layout_height="wrap_content"
+		android:hint="URL..."
+		android:text="https://"
+		android:padding="10dp"
+		android:id="@+id/EditUrl"/>
+
+	<LinearLayout
+		android:orientation="horizontal"
+		android:layout_width="wrap_content"
+		android:layout_height="wrap_content"
+		android:padding="10dp">
+
+		<Button
+			android:layout_width="wrap_content"
+			android:layout_height="wrap_content"
+			android:text="Open Now"
+			android:padding="10dp"
+			android:id="@+id/BtnOpen"/>
+
+		<Button
+			android:layout_width="wrap_content"
+			android:layout_height="wrap_content"
+			android:text="Add Shortcut"
+			android:padding="10dp"
+			android:id="@+id/BtnShortcut"/>
+
+	</LinearLayout>
+
+	<Switch
+		android:layout_width="wrap_content"
+		android:layout_height="wrap_content"
+		android:text="[Open Now] Force load from local cache"
+		android:padding="10dp"
+		android:checked="true"
+		android:id="@+id/SwitchCache"/>
+
+</LinearLayout>

app/src/main/res/layout/webwindow.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout
+	xmlns:android="http://schemas.android.com/apk/res/android"
+	android:layout_width="fill_parent"
+	android:layout_height="fill_parent"
+	android:orientation="vertical"
+	android:id="@+id/LayMain">
+
+	<WebView
+		android:layout_height="match_parent"
+		android:layout_width="match_parent"
+		android:id="@+id/Web0"/>
+
+</LinearLayout>

app/src/main/res/values-v21/styles.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <style name="AppTheme" parent="@android:style/Theme.Material.Light">
+	</style>
+</resources>

app/src/main/res/values/strings.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="app_name">browserocto</string>
+</resources>

app/src/main/res/values/styles.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <style name="AppTheme" parent="@android:style/Theme.Holo.Light">
+	</style>
+</resources>