Add android example app

android/.gitignore

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+*.iml
+.gradle
+/local.properties
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx
+local.properties

android/app/.gitignore

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+/build

android/app/build.gradle

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+plugins {
+    alias(libs.plugins.android.application)
+}
+
+android {
+    namespace 'io.xconn.cryptologyexample'
+    compileSdk 34
+
+    defaultConfig {
+        applicationId "io.xconn.cryptologyexample"
+        minSdk 24
+        targetSdk 34
+        versionCode 1
+        versionName "1.0"
+
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+}
+
+dependencies {
+
+    implementation libs.appcompat
+    implementation libs.activity
+    implementation libs.constraintlayout
+
+
+    implementation libs.cryptology
+    implementation libs.navigation.fragment.ktx
+    implementation libs.navigation.ui.ktx
+    implementation libs.material
+    implementation libs.drawerlayout
+
+
+}

android/app/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# 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

android/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"
+    xmlns:tools="http://schemas.android.com/tools">
+    <uses-feature android:name="android.hardware.camera.any" />
+
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
+
+    <uses-feature
+        android:name="android.hardware.camera"
+        android:required="false" />
+
+    <uses-permission android:name="android.permission.CAMERA" />
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
+
+    <application
+        android:name=".util.App"
+        android:allowBackup="false"
+        android:dataExtractionRules="@xml/data_extraction_rules"
+        android:fullBackupContent="@xml/backup_rules"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.CryptologyExample"
+        tools:targetApi="31">
+
+
+        <activity
+            android:name=".MainActivity"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

android/app/src/main/java/io/xconn/cryptologyexample/MainActivity.java

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+package io.xconn.cryptologyexample;
+
+import static io.xconn.cryptologyexample.util.Helpers.bytesToHex;
+import static io.xconn.cryptologyexample.util.Helpers.convertTo32Bytes;
+
+
+import android.os.Bundle;
+import android.text.Editable;
+import android.text.TextUtils;
+import android.text.TextWatcher;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.widget.EditText;
+
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.fragment.app.Fragment;
+import androidx.fragment.app.FragmentManager;
+
+import com.google.android.material.bottomnavigation.BottomNavigationView;
+import com.google.android.material.dialog.MaterialAlertDialogBuilder;
+import com.google.android.material.textfield.TextInputLayout;
+
+import java.util.Objects;
+
+import io.xconn.cryptology.KeyPair;
+import io.xconn.cryptology.SealedBox;
+import io.xconn.cryptology.SecretBox;
+import io.xconn.cryptologyexample.fragment.CameraFragment;
+import io.xconn.cryptologyexample.fragment.GalleryFragment;
+import io.xconn.cryptologyexample.util.App;
+
+public class MainActivity extends AppCompatActivity {
+
+
+    private androidx.appcompat.app.AlertDialog passwordDialog;
+
+    private FragmentManager fragmentManager;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+
+        if (!App.getBoolean("isDialogShown")) {
+            showPasswordDialog();
+        }
+        fragmentManager = getSupportFragmentManager();
+        BottomNavigationView bottomNavigationView = findViewById(R.id.bottom_navigation);
+
+        Fragment cameraFragment = new CameraFragment();
+        fragmentManager.beginTransaction().replace(R.id.frameLayout, cameraFragment).commit();
+
+        bottomNavigationView.setOnItemSelectedListener(item -> {
+            Fragment fragment = null;
+            if (item.getItemId() == R.id.menu_camera) {
+                fragment = new CameraFragment();
+            } else if (item.getItemId() == R.id.menu_gallery) {
+                fragment = new GalleryFragment();
+            }
+
+            if (fragment != null) {
+                fragmentManager.beginTransaction().replace(R.id.frameLayout, fragment).commit();
+                return true;
+            }
+            return false;
+        });
+    }
+
+    private void showPasswordDialog() {
+        MaterialAlertDialogBuilder builder = new MaterialAlertDialogBuilder(this);
+        LayoutInflater inflater = getLayoutInflater();
+        View dialogView = inflater.inflate(R.layout.custom_dialog_box, null);
+        TextInputLayout textInputLayoutPassword = dialogView.findViewById(R.id.enterPassword);
+        EditText editTextPassword = textInputLayoutPassword.getEditText();
+
+        builder.setView(dialogView)
+                .setTitle("Enter Password")
+                .setPositiveButton("Submit", null)
+                .setCancelable(false);
+
+        passwordDialog = builder.create();
+        passwordDialog.show();
+
+        passwordDialog.getButton(androidx.appcompat.app.AlertDialog.BUTTON_POSITIVE)
+                .setOnClickListener(v -> {
+            String enteredPassword = editTextPassword != null ?
+                    editTextPassword.getText().toString().trim() : "";
+
+            if (enteredPassword.isEmpty()) {
+                textInputLayoutPassword.setError("Please enter a password");
+                textInputLayoutPassword.requestFocus();
+            } else {
+                KeyPair keyPair = SealedBox.generateKeyPair();
+                String publicKey = bytesToHex(keyPair.getPublicKey());
+                App.saveString(App.PREF_PUBLIC_KEY, publicKey);
+
+                byte[] nonce = SecretBox.generateNonce();
+                App.saveString("nonce", bytesToHex(nonce));
+
+                byte[] encryptedPrivateKey = SecretBox.box(nonce, keyPair.getPrivateKey(),
+                        Objects.requireNonNull(convertTo32Bytes(enteredPassword)));
+                App.saveString(App.PREF_PRIVATE_KEY, bytesToHex(encryptedPrivateKey));
+
+                App.saveBoolean("isDialogShown", true);
+                passwordDialog.dismiss();
+
+                System.out.println("------passSaved ");
+            }
+        });
+
+        assert editTextPassword != null;
+        editTextPassword.addTextChangedListener(new TextWatcher() {
+            @Override
+            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
+                // No action needed
+            }
+
+            @Override
+            public void onTextChanged(CharSequence s, int start, int before, int count) {
+                passwordDialog.getButton(androidx.appcompat.app.AlertDialog.BUTTON_POSITIVE)
+                        .setEnabled(!TextUtils.isEmpty(s));
+            }
+
+            @Override
+            public void afterTextChanged(Editable s) {
+                // No action needed
+            }
+        });
+
+        passwordDialog.getButton(androidx.appcompat.app.AlertDialog.BUTTON_POSITIVE)
+                .setEnabled(false);
+    }
+}