Do not set LD_LIBRARY_PATH by default

See https://github.com/termux/termux-app/issues/1286

.cirrus.yml

@@ -0,0 +1,20 @@
+container:
+  image: cirrusci/android-sdk:28
+  cpu: 2
+  memory: 8G
+
+task:
+  name: tests
+  script: ./gradlew test
+
+task:
+  name: debug-build
+
+  depends_on:
+    - tests
+
+  script: |
+    ./gradlew assembleDebug
+
+  output_artifacts:
+    path: "./app/build/outputs/apk/debug/*.apk"

.gitignore

@@ -7,6 +7,8 @@ build/
 *.apk
 *.so
 .externalNativeBuild
+.cxx
+*.zip
 
 # Crashlytics configuations
 com_crashlytics_export_strings.xml

.travis.yml

@@ -1,34 +0,0 @@
-sudo: false
-language: android
-jdk: oraclejdk8
-
-env:
-  global:
-    # The next declaration is the encrypted COVERITY_SCAN_TOKEN, created
-    # via the "travis encrypt" command using the project repo's public key
-    - secure: "LdajbHNfRlpnqzhX5KY2Vr7KtzU9vXDs1TCNn93J6Dt522f2AaiyUDJvISvz+uslk0WJiS5bB5vGwQmXginxz6Qi6uMgMbjWXulv1vfs6ZviKpUX348DOp1qKPa8WfVNB66F84SwGIfc8cRMAgCFw79l/DFgLErubF8vKo1wZ8Hmvrz//+RJ0BGMa3YRc4VyJhAL0P+0Wc1Q2Im7R9EovAxC5pZXBIMSgr6g5GzLWPisbNLXpMPGsDeYhcenO6XCtCCy+aNxUYM8vcrLDzlVXR5Hy7KEs/MGRTS0Yk13TWUEYa5wBpKelFTszdWYLVn5ANreh/aXRVfHpnW3epotMYguLx1kSvOhWEnc4F+qqv3nle2LpDg9Y9bcLyTTcYnPl9smqEVVjEDu0FoIr1V58xkG4Oc6BPIvLRjlMVU96PXh2HxMLuGsJ/xM+uAFU9oVMbC07xn42Eu5O4NHOHJNOwMWac4/lSKRK8W/7/vWuXj5vhkD9ZsGVpN70UtY5HAfNUGADnTeDblvjgFTNZ2mUN/u0o7Z8ZFURYllZ9YU+Vr2nPf9CAhVBjuwFWx8uRQpAg1aDmc1dVMJijRBeBeU/uWhYqsGp34wkNEl8VGzob4R4QTyI8+T7CndGqKVmbTK/SjqKhjjPpbXIAfOH+JtxvAnNmb8XeQSJ32uK2nexFo="
-
-android:
-  components:
-    - platform-tools
-    - tools
-    - build-tools-28.0.3
-    - android-28
-    - extra-android-m2repository
-
-before_install:
-  - yes | sdkmanager "ndk-bundle"
-  - yes | sdkmanager "platforms;android-28"
-
-script:
-  - ./gradlew testDebugUnitTest
-
-addons:
-  coverity_scan:
-    project:
-      name: "termux/termux-app"
-      description: "Terminal emulator and Linux environment for Android"
-    notification_email: fredrik@fornwall.net
-    build_command_prepend: "./gradlew clean"
-    build_command: "./gradlew build"
-    branch_pattern: master

README.md

@@ -1,32 +1,63 @@
-[![Travis build status](https://travis-ci.org/termux/termux-app.svg?branch=master)](https://travis-ci.org/termux/termux-app)
+# Termux application
+
+[![Build status](https://api.cirrus-ci.com/github/termux/termux-app.svg?branch=master)](https://cirrus-ci.com/termux/termux-app)
 [![Join the chat at https://gitter.im/termux/termux](https://badges.gitter.im/termux/termux.svg)](https://gitter.im/termux/termux)
 
+[Termux](https://termux.com) is an Android terminal application and Linux environment.
 
-Termux app
-==========
+- [Termux Reddit community](https://reddit.com/r/termux)
+- [Termux Wiki](https://wiki.termux.com/wiki/)
+- [Termux Twitter](http://twitter.com/termux/)
 
-[Termux](https://termux.com) is an Android terminal app and Linux environment.
+Note that this repository is for the app itself (the user interface and the
+terminal emulation). For the packages installable inside the app, see
+[termux/termux-packages](https://github.com/termux/termux-packages)
 
-* [Termux on Google Play Store](https://play.google.com/store/apps/details?id=com.termux)
-* [Termux on F-Droid](https://f-droid.org/repository/browse/?fdid=com.termux)
-* [Termux Google+ community](http://termux.com/community/)
-* [Termux Wiki](https://wiki.termux.com/wiki/)
-* [Termux Twitter](http://twitter.com/termux/)
+## Installation
 
-Note that this repository is for the app itself (the user interface and the terminal emulation). For the packages installable inside the app, see [termux/termux-packages](https://github.com/termux/termux-packages)
+Termux:Widget application can be obtained from:
 
-Terminal resources
-==================
-* [XTerm control sequences](http://invisible-island.net/xterm/ctlseqs/ctlseqs.html)
-* [vt100.net](http://vt100.net/)
-* [Terminal codes (ANSI and terminfo equivalents)](http://wiki.bash-hackers.org/scripting/terminalcodes)
+- [Google Play](https://play.google.com/store/apps/details?id=com.termux)
+- [F-Droid](https://f-droid.org/en/packages/com.termux/)
+- [Kali Nethunter Store](https://store.nethunter.com/en/packages/com.termux/)
 
-Terminal emulators
-==================
-* VTE (libvte): Terminal emulator widget for GTK+, mainly used in gnome-terminal. [Source](https://github.com/GNOME/vte), [Open Issues](https://bugzilla.gnome.org/buglist.cgi?quicksearch=product%3A%22vte%22+), and [All (including closed) issues](https://bugzilla.gnome.org/buglist.cgi?bug_status=RESOLVED&bug_status=VERIFIED&chfield=resolution&chfieldfrom=-2000d&chfieldvalue=FIXED&product=vte&resolution=FIXED).
-* iTerm 2: OS X terminal application. [Source](https://github.com/gnachman/iTerm2), [Issues](https://gitlab.com/gnachman/iterm2/issues) and [Documentation](http://www.iterm2.com/documentation.html) (which includes [iTerm2 proprietary escape codes](http://www.iterm2.com/documentation-escape-codes.html)).
-* Konsole: KDE terminal application. [Source](https://projects.kde.org/projects/kde/applications/konsole/repository), in particular [tests](https://projects.kde.org/projects/kde/applications/konsole/repository/revisions/master/show/tests), [Bugs](https://bugs.kde.org/buglist.cgi?bug_severity=critical&bug_severity=grave&bug_severity=major&bug_severity=crash&bug_severity=normal&bug_severity=minor&bug_status=UNCONFIRMED&bug_status=NEW&bug_status=ASSIGNED&bug_status=REOPENED&product=konsole) and [Wishes](https://bugs.kde.org/buglist.cgi?bug_severity=wishlist&bug_status=UNCONFIRMED&bug_status=NEW&bug_status=ASSIGNED&bug_status=REOPENED&product=konsole).
-* hterm: JavaScript terminal implementation from Chromium. [Source](https://github.com/chromium/hterm), including [tests](https://github.com/chromium/hterm/blob/master/js/hterm_vt_tests.js), and [Google group](https://groups.google.com/a/chromium.org/forum/#!forum/chromium-hterm).
-* xterm: The grandfather of terminal emulators. [Source](http://invisible-island.net/datafiles/release/xterm.tar.gz).
-* Connectbot: Android SSH client. [Source](https://github.com/connectbot/connectbot)
-* Android Terminal Emulator: Android terminal app which Termux terminal handling is based on. Inactive. [Source](https://github.com/jackpal/Android-Terminal-Emulator).
+Additionally we offer development builds for those who want to try out latest
+features ready to be included in future versions. Such build can be obtained
+directly from [Cirrus CI artifacts](https://api.cirrus-ci.com/v1/artifact/github/termux/termux-app/debug-build/output/app/build/outputs/apk/debug/app-debug.apk).
+
+Signature keys of all offered builds are different. Before you switch the
+installation source, you will have to uninstall the Termux application and
+all currently installed plugins.
+
+## Terminal resources
+
+- [XTerm control sequences](http://invisible-island.net/xterm/ctlseqs/ctlseqs.html)
+- [vt100.net](http://vt100.net/)
+- [Terminal codes (ANSI and terminfo equivalents)](http://wiki.bash-hackers.org/scripting/terminalcodes)
+
+## Terminal emulators
+
+- VTE (libvte): Terminal emulator widget for GTK+, mainly used in gnome-terminal.
+  [Source](https://github.com/GNOME/vte), [Open Issues](https://bugzilla.gnome.org/buglist.cgi?quicksearch=product%3A%22vte%22+),
+  and [All (including closed) issues](https://bugzilla.gnome.org/buglist.cgi?bug_status=RESOLVED&bug_status=VERIFIED&chfield=resolution&chfieldfrom=-2000d&chfieldvalue=FIXED&product=vte&resolution=FIXED).
+
+- iTerm 2: OS X terminal application. [Source](https://github.com/gnachman/iTerm2),
+  [Issues](https://gitlab.com/gnachman/iterm2/issues) and [Documentation](http://www.iterm2.com/documentation.html)
+  (which includes [iTerm2 proprietary escape codes](http://www.iterm2.com/documentation-escape-codes.html)).
+
+- Konsole: KDE terminal application. [Source](https://projects.kde.org/projects/kde/applications/konsole/repository),
+  in particular [tests](https://projects.kde.org/projects/kde/applications/konsole/repository/revisions/master/show/tests),
+  [Bugs](https://bugs.kde.org/buglist.cgi?bug_severity=critical&bug_severity=grave&bug_severity=major&bug_severity=crash&bug_severity=normal&bug_severity=minor&bug_status=UNCONFIRMED&bug_status=NEW&bug_status=ASSIGNED&bug_status=REOPENED&product=konsole)
+  and [Wishes](https://bugs.kde.org/buglist.cgi?bug_severity=wishlist&bug_status=UNCONFIRMED&bug_status=NEW&bug_status=ASSIGNED&bug_status=REOPENED&product=konsole).
+
+- hterm: JavaScript terminal implementation from Chromium. [Source](https://github.com/chromium/hterm),
+  including [tests](https://github.com/chromium/hterm/blob/master/js/hterm_vt_tests.js),
+  and [Google group](https://groups.google.com/a/chromium.org/forum/#!forum/chromium-hterm).
+
+- xterm: The grandfather of terminal emulators.
+  [Source](http://invisible-island.net/datafiles/release/xterm.tar.gz).
+
+- Connectbot: Android SSH client. [Source](https://github.com/connectbot/connectbot)
+
+- Android Terminal Emulator: Android terminal app which Termux terminal handling
+  is based on. Inactive. [Source](https://github.com/jackpal/Android-Terminal-Emulator).

app/build.gradle

@@ -1,4 +1,6 @@
-apply plugin: 'com.android.application'
+plugins {
+  id "com.android.application"
+}
 
 android {
     compileSdkVersion 28
@@ -12,10 +14,30 @@ android {
 
     defaultConfig {
         applicationId "com.termux"
-        minSdkVersion 21
+        minSdkVersion 24
         targetSdkVersion 28
-        versionCode 75
-        versionName "0.75"
+        versionCode 76
+        versionName "0.76"
+
+        externalNativeBuild {
+            ndkBuild {
+                cFlags "-std=c11", "-Wall", "-Wextra", "-Werror", "-Os", "-fno-stack-protector", "-Wl,--gc-sections"
+            }
+        }
+
+        ndk {
+            abiFilters 'x86', 'x86_64', 'armeabi-v7a', 'arm64-v8a'
+        }
+
+    }
+
+    signingConfigs {
+        debug {
+            storeFile file('dev_keystore.jks')
+            keyAlias 'alias'
+            storePassword 'xrj45yWGLbsO7W0v'
+            keyPassword 'xrj45yWGLbsO7W0v'
+        }
     }
 
     buildTypes {
@@ -24,12 +46,22 @@ android {
             shrinkResources true
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
         }
+
+        debug {
+            signingConfig signingConfigs.debug
+        }
     }
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
         targetCompatibility JavaVersion.VERSION_1_8
     }
+
+    externalNativeBuild {
+        ndkBuild {
+            path "src/main/cpp/Android.mk"
+        }
+    }
 }
 
 dependencies {
@@ -41,3 +73,69 @@ task versionName {
     print android.defaultConfig.versionName
   }
 }
+
+def downloadBootstrap(String arch, String expectedChecksum, int version) {
+    def digest = java.security.MessageDigest.getInstance("SHA-256")
+
+    def localUrl = "src/main/cpp/bootstrap-" + arch + ".zip"
+    def file = new File(projectDir, localUrl)
+    if (file.exists()) {
+        def buffer = new byte[8192]
+        def input = new FileInputStream(file)
+        while (true) {
+            def readBytes = input.read(buffer)
+            if (readBytes < 0) break
+            digest.update(buffer, 0, readBytes)
+        }
+        def checksum = new BigInteger(1, digest.digest()).toString(16)
+        if (checksum == expectedChecksum) {
+            return
+        } else {
+            logger.quiet("Deleting old local file with wrong hash: " + localUrl)
+            file.delete()
+        }
+    }
+
+    def remoteUrl = "https://bintray.com/termux/bootstrap/download_file?file_path=bootstrap-" + arch + "-v" + version + ".zip"
+    logger.quiet("Downloading " + remoteUrl + " ...")
+
+    file.parentFile.mkdirs()
+    def out = new BufferedOutputStream(new FileOutputStream(file))
+
+    def connection = new URL(remoteUrl).openConnection()
+    connection.setInstanceFollowRedirects(true)
+    def digestStream = new java.security.DigestInputStream(connection.inputStream, digest)
+    out << digestStream
+    out.close()
+
+    def checksum = new BigInteger(1, digest.digest()).toString(16)
+    if (checksum != expectedChecksum) {
+        file.delete()
+        throw new GradleException("Wrong checksum for " + remoteUrl + ": expected: " + expectedChecksum + ", actual: " + checksum)
+    }
+}
+
+clean {
+    doLast {
+        def tree = fileTree(new File(projectDir, 'src/main/cpp'))
+        tree.include 'bootstrap-*.zip'
+        tree.each { it.delete() }
+    }
+}
+
+task downloadBootstraps(){
+    doLast {
+        def version = 17
+        downloadBootstrap("aarch64", "1846c453e7d4399559683e9a74eb8db048d1e88872668361652752b40ea2f3a2", version)
+        downloadBootstrap("arm",     "2f5a8061a1c13d48b659cb57c3767d59f5151f247ea032e2401135701dbd8058", version)
+        downloadBootstrap("i686",    "ca0e3559c5ac925528a7c8725a83a752ca63d5c1e0ff306e5ecd6ea9dd4c1de5", version)
+        downloadBootstrap("x86_64",  "9de2ac75ed0f3370418d3c55b470c176f69180079ba9461034bc7f6195fc5872", version)
+    }
+}
+
+afterEvaluate {
+  android.applicationVariants.all { variant ->
+    variant.javaCompiler.dependsOn(downloadBootstraps)
+  }
+}
+

app/src/main/AndroidManifest.xml

@@ -8,6 +8,7 @@
     <uses-feature android:name="android.hardware.touchscreen" android:required="false" />
     <uses-feature android:name="android.software.leanback" android:required="false" />
 
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
     <uses-permission android:name="android.permission.WAKE_LOCK" />

app/src/main/cpp/Android.mk

@@ -0,0 +1,5 @@
+LOCAL_PATH:= $(call my-dir)
+include $(CLEAR_VARS)
+LOCAL_MODULE := libtermux-bootstrap
+LOCAL_SRC_FILES := termux-bootstrap-zip.S termux-bootstrap.c
+include $(BUILD_SHARED_LIBRARY)

app/src/main/cpp/termux-bootstrap-zip.S

@@ -0,0 +1,18 @@
+     .global blob
+     .global blob_size
+     .section .rodata
+ blob:
+ #if defined __i686__
+     .incbin "bootstrap-i686.zip"
+ #elif defined __x86_64__
+     .incbin "bootstrap-x86_64.zip"
+ #elif defined __aarch64__
+     .incbin "bootstrap-aarch64.zip"
+ #elif defined __arm__
+     .incbin "bootstrap-arm.zip"
+ #else
+ # error Unsupported arch
+ #endif
+ 1:
+ blob_size:
+     .int 1b - blob

app/src/main/cpp/termux-bootstrap.c

@@ -0,0 +1,11 @@
+#include <jni.h>
+
+extern jbyte blob[];
+extern int blob_size;
+
+JNIEXPORT jbyteArray JNICALL Java_com_termux_app_TermuxInstaller_getZip(JNIEnv *env, __attribute__((__unused__)) jobject This)
+{
+    jbyteArray ret = (*env)->NewByteArray(env, blob_size);
+    (*env)->SetByteArrayRegion(env, ret, 0, blob_size, blob);
+    return ret;
+}

app/src/main/java/com/termux/app/BackgroundJob.java

@@ -139,14 +139,14 @@ public final class BackgroundJob {
         try (BufferedReader in = new BufferedReader(new InputStreamReader(new FileInputStream(TermuxService.PREFIX_PATH + "/etc/apt/sources.list")))) {
             String line;
             while ((line = in.readLine()) != null) {
-                if (!line.startsWith("#") && line.contains("https://dl.bintray.com/termux/termux-packages-24")) {
-                    return false;
+                if (!line.startsWith("#") && line.contains("//termux.net stable")) {
+                    return true;
                 }
             }
         } catch (IOException e) {
             Log.e(LOG_TAG, "Error trying to read sources.list", e);
         }
-        return true;
+        return false;
     }
 
     public static int getPid(Process p) {

app/src/main/java/com/termux/app/TermuxActivity.java

@@ -127,6 +127,8 @@ public final class TermuxActivity extends Activity implements ServiceConnection
      */
     boolean mIsVisible;
 
+    boolean mIsUsingBlackUI;
+
     final SoundPool mBellSoundPool = new SoundPool.Builder().setMaxStreams(1).setAudioAttributes(
         new AudioAttributes.Builder().setContentType(AudioAttributes.CONTENT_TYPE_SONIFICATION)
             .setUsage(AudioAttributes.USAGE_ASSISTANCE_SONIFICATION).build()).build();
@@ -203,11 +205,24 @@ public final class TermuxActivity extends Activity implements ServiceConnection
 
     @Override
     public void onCreate(Bundle bundle) {
+        mSettings = new TermuxPreferences(this);
+        mIsUsingBlackUI = mSettings.isUsingBlackUI();
+        if (mIsUsingBlackUI) {
+            this.setTheme(R.style.Theme_Termux_Black);
+        } else {
+            this.setTheme(R.style.Theme_Termux);
+        }
+
         super.onCreate(bundle);
 
-        mSettings = new TermuxPreferences(this);
-
         setContentView(R.layout.drawer_layout);
+
+        if (mIsUsingBlackUI) {
+            findViewById(R.id.left_drawer).setBackgroundColor(
+                getResources().getColor(android.R.color.background_dark)
+            );
+        }
+
         mTerminalView = findViewById(R.id.terminal_view);
         mTerminalView.setOnKeyListener(new TermuxViewClient(this));
 
@@ -434,7 +449,11 @@ public final class TermuxActivity extends Activity implements ServiceConnection
                 boolean sessionRunning = sessionAtRow.isRunning();
 
                 TextView firstLineView = row.findViewById(R.id.row_line);
-
+                if (mIsUsingBlackUI) {
+                    firstLineView.setBackground(
+                        getResources().getDrawable(R.drawable.selected_session_background_black)
+                    );
+                }
                 String name = sessionAtRow.mSessionName;
                 String sessionTitle = sessionAtRow.getTitle();
 
@@ -454,7 +473,8 @@ public final class TermuxActivity extends Activity implements ServiceConnection
                 } else {
                     firstLineView.setPaintFlags(firstLineView.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG);
                 }
-                int color = sessionRunning || sessionAtRow.getExitStatus() == 0 ? Color.BLACK : Color.RED;
+                int defaultColor = mIsUsingBlackUI ? Color.WHITE : Color.BLACK;
+                int color = sessionRunning || sessionAtRow.getExitStatus() == 0 ? defaultColor : Color.RED;
                 firstLineView.setTextColor(color);
                 return row;
             }

app/src/main/java/com/termux/app/TermuxInstaller.java

@@ -16,6 +16,7 @@ import com.termux.R;
 import com.termux.terminal.EmulatorDebug;
 
 import java.io.BufferedReader;
+import java.io.ByteArrayInputStream;
 import java.io.File;
 import java.io.FileOutputStream;
 import java.io.IOException;
@@ -38,7 +39,7 @@ import java.util.zip.ZipInputStream;
  * <p/>
  * (3) A staging folder, $STAGING_PREFIX, is {@link #deleteFolder(File)} if left over from broken installation below.
  * <p/>
- * (4) The architecture is determined and an appropriate bootstrap zip url is determined in {@link #determineZipUrl()}.
+ * (4) The zip file is loaded from a shared library.
  * <p/>
  * (5) The zip, containing entries relative to the $PREFIX, is is downloaded and extracted by a zip input stream
  * continuously encountering zip file entries:
@@ -82,8 +83,8 @@ final class TermuxInstaller {
                     final byte[] buffer = new byte[8096];
                     final List<Pair<String, String>> symlinks = new ArrayList<>(50);
 
-                    final URL zipUrl = determineZipUrl();
-                    try (ZipInputStream zipInput = new ZipInputStream(zipUrl.openStream())) {
+                    final byte[] zipBytes = loadZipBytes();
+                    try (ZipInputStream zipInput = new ZipInputStream(new ByteArrayInputStream(zipBytes))) {
                         ZipEntry zipEntry;
                         while ((zipEntry = zipInput.getNextEntry()) != null) {
                             if (zipEntry.getName().equals("SYMLINKS.txt")) {
@@ -167,34 +168,13 @@ final class TermuxInstaller {
         }
     }
 
-    /** Get bootstrap zip url for this systems cpu architecture. */
-    private static URL determineZipUrl() throws MalformedURLException {
-        String archName = determineTermuxArchName();
-        String url = Build.VERSION.SDK_INT >= Build.VERSION_CODES.N
-            ? "https://termux.org/bootstrap-" + archName + ".zip"
-            : "https://termux.net/bootstrap/bootstrap-" + archName + ".zip";
-        return new URL(url);
+    public static byte[] loadZipBytes() {
+        // Only load the shared library when necessary to save memory usage.
+        System.loadLibrary("termux-bootstrap");
+        return getZip();
     }
 
-    private static String determineTermuxArchName() {
-        // Note that we cannot use System.getProperty("os.arch") since that may give e.g. "aarch64"
-        // while a 64-bit runtime may not be installed (like on the Samsung Galaxy S5 Neo).
-        // Instead we search through the supported abi:s on the device, see:
-        // http://developer.android.com/ndk/guides/abis.html
-        // Note that we search for abi:s in preferred order (the ordering of the
-        // Build.SUPPORTED_ABIS list) to avoid e.g. installing arm on an x86 system where arm
-        // emulation is available.
-        for (String androidArch : Build.SUPPORTED_ABIS) {
-            switch (androidArch) {
-                case "arm64-v8a": return "aarch64";
-                case "armeabi-v7a": return "arm";
-                case "x86_64": return "x86_64";
-                case "x86": return "i686";
-            }
-        }
-        throw new RuntimeException("Unable to determine arch from Build.SUPPORTED_ABIS =  " +
-            Arrays.toString(Build.SUPPORTED_ABIS));
-    }
+    public static native byte[] getZip();
 
     /** Delete a folder and all its content or throw. Don't follow symlinks. */
     static void deleteFolder(File fileOrDirectory) throws IOException {

app/src/main/java/com/termux/app/TermuxPreferences.java

@@ -58,6 +58,7 @@ final class TermuxPreferences {
     private static final String CURRENT_SESSION_KEY = "current_session";
     private static final String SCREEN_ALWAYS_ON_KEY = "screen_always_on";
 
+    private String mUseDarkUI;
     private boolean mScreenAlwaysOn;
     private int mFontSize;
 
@@ -126,6 +127,10 @@ final class TermuxPreferences {
         return mScreenAlwaysOn;
     }
 
+    boolean isUsingBlackUI() {
+        return mUseDarkUI.toLowerCase().equals("true");
+    }
+
     void setScreenAlwaysOn(Context context, boolean newValue) {
         mScreenAlwaysOn = newValue;
         PreferenceManager.getDefaultSharedPreferences(context).edit().putBoolean(SCREEN_ALWAYS_ON_KEY, newValue).apply();
@@ -173,6 +178,8 @@ final class TermuxPreferences {
                 break;
         }
 
+        mUseDarkUI = props.getProperty("use-black-ui", "false");
+
         try {
             JSONArray arr = new JSONArray(props.getProperty("extra-keys", "[['ESC', 'TAB', 'CTRL', 'ALT', '-', 'DOWN', 'UP']]"));
 

app/src/main/res/drawable/current_session.xml

@@ -1,4 +1,4 @@
 <?xml version="1.0" encoding="utf-8"?>
 <shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle">
     <solid android:color="#E0E0E0" />
-</shape>
+</shape>

app/src/main/res/drawable/current_session_black.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle">
+    <solid android:color="#212325" />
+</shape>

app/src/main/res/drawable/selected_session_background_black.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:state_activated="true" android:drawable="@drawable/current_session_black"/>
+    <item android:state_activated="false" android:drawable="@drawable/session_ripple_black"/>
+</selector>

app/src/main/res/drawable/session_ripple.xml

@@ -4,4 +4,4 @@
     <item>
         <color android:color="@android:color/white" />
     </item>
-</ripple>
+</ripple>

app/src/main/res/drawable/session_ripple_black.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<ripple xmlns:android="http://schemas.android.com/apk/res/android"
+    android:color="@android:color/darker_gray" >
+    <item>
+        <color android:color="@android:color/background_dark" />
+    </item>
+</ripple>

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

@@ -1,8 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources xmlns:android="http://schemas.android.com/apk/res/android">
 
-    <!-- See https://developer.android.com/training/material/theme.html for how to customize the Material theme. -->
-    <!-- NOTE: Cannot use "Light." since it hides the terminal scrollbar on the default black background. -->
     <style name="Theme.Termux" parent="@android:style/Theme.Material.Light.NoActionBar">
         <item name="android:statusBarColor">#000000</item>
         <item name="android:colorPrimary">#FF000000</item>
@@ -23,9 +21,29 @@
         <item name="android:windowAllowEnterTransitionOverlap">true</item>
     </style>
 
-	<style name="TermuxAlertDialogStyle" parent="@android:style/Theme.Material.Light.Dialog.Alert">
-	    <!-- Seen in buttons on alert dialog: -->
+    <style name="TermuxAlertDialogStyle" parent="@android:style/Theme.Material.Light.Dialog.Alert">
+        <!-- Seen in buttons on alert dialog: -->
         <item name="android:colorAccent">#212121</item>
     </style>
 
+    <!-- See https://developer.android.com/training/material/theme.html for how to customize the Material theme. -->
+    <!-- NOTE: Cannot use "Light." since it hides the terminal scrollbar on the default black background. -->
+    <style name="Theme.Termux.Black" parent="@android:style/Theme.Material.NoActionBar">
+        <item name="android:statusBarColor">#000000</item>
+        <item name="android:colorPrimary">#FF000000</item>
+        <item name="android:windowBackground">@android:color/black</item>
+
+        <!-- Seen in buttons on left drawer: -->
+        <item name="android:colorAccent">#FDFDFD</item>
+        <!-- Avoid action mode toolbar pushing down terminal content when
+             selecting text on pre-6.0 (non-floating toolbar). -->
+        <item name="android:windowActionModeOverlay">true</item>
+
+        <item name="android:windowTranslucentStatus">true</item>
+        <item name="android:windowTranslucentNavigation">true</item>
+
+        <!-- https://developer.android.com/training/tv/start/start.html#transition-color -->
+        <item name="android:windowAllowReturnTransitionOverlap">true</item>
+        <item name="android:windowAllowEnterTransitionOverlap">true</item>
+    </style>
 </resources>

build.gradle

@@ -4,7 +4,7 @@ buildscript {
         google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.0'
+        classpath 'com.android.tools.build:gradle:3.5.1'
     }
 }