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Merge pull request #16 from vens8/native-neural-networks
Native neural networks
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‎Assignment2/.idea/misc.xml

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‎Assignment3/TensorFlowCNN/.gitignore

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

‎Assignment3/TensorFlowCNN/.idea/.gitignore

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‎Assignment3/TensorFlowCNN/app/.gitignore

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/build

‎Assignment3/TensorFlowCNN/app/build.gradle.kts

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plugins {
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alias(libs.plugins.androidApplication)
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alias(libs.plugins.jetbrainsKotlinAndroid)
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}
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android {
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namespace = "com.example.tensorflowcnn"
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compileSdk = 34
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defaultConfig {
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applicationId = "com.example.tensorflowcnn"
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minSdk = 24
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targetSdk = 34
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versionCode = 1
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versionName = "1.0"
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testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
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vectorDrawables {
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useSupportLibrary = true
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}
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}
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buildTypes {
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release {
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isMinifyEnabled = false
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proguardFiles(
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getDefaultProguardFile("proguard-android-optimize.txt"),
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"proguard-rules.pro"
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)
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}
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}
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compileOptions {
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sourceCompatibility = JavaVersion.VERSION_1_8
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targetCompatibility = JavaVersion.VERSION_1_8
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}
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kotlinOptions {
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jvmTarget = "1.8"
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}
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buildFeatures {
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compose = true
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mlModelBinding = true
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}
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composeOptions {
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kotlinCompilerExtensionVersion = "1.5.1"
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}
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packaging {
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resources {
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excludes += "/META-INF/{AL2.0,LGPL2.1}"
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}
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}
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}
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dependencies {
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implementation(libs.androidx.core.ktx)
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implementation(libs.androidx.lifecycle.runtime.ktx)
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implementation(libs.androidx.activity.compose)
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implementation(platform(libs.androidx.compose.bom))
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implementation(libs.androidx.ui)
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implementation(libs.androidx.ui.graphics)
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implementation(libs.androidx.ui.tooling.preview)
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implementation(libs.androidx.material3)
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implementation(libs.tensorflow.lite.support)
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implementation(libs.tensorflow.lite.metadata)
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implementation(libs.tensorflow.lite.gpu)
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testImplementation(libs.junit)
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androidTestImplementation(libs.androidx.junit)
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androidTestImplementation(libs.androidx.espresso.core)
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androidTestImplementation(platform(libs.androidx.compose.bom))
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androidTestImplementation(libs.androidx.ui.test.junit4)
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debugImplementation(libs.androidx.ui.tooling)
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debugImplementation(libs.androidx.ui.test.manifest)
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implementation(libs.androidx.core.splashscreen)
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}

‎Assignment3/TensorFlowCNN/app/proguard-rules.pro

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# Add project specific ProGuard rules here.
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# You can control the set of applied configuration files using the
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# proguardFiles setting in build.gradle.
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#
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# For more details, see
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# http://developer.android.com/guide/developing/tools/proguard.html
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# If your project uses WebView with JS, uncomment the following
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# and specify the fully qualified class name to the JavaScript interface
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# class:
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#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
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# public *;
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#}
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# Uncomment this to preserve the line number information for
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# debugging stack traces.
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#-keepattributes SourceFile,LineNumberTable
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# If you keep the line number information, uncomment this to
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# hide the original source file name.
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#-renamesourcefileattribute SourceFile

‎Assignment3/TensorFlowCNN/app/src/androidTest/java/com/example/tensorflowcnn/ExampleInstrumentedTest.kt

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package com.example.tensorflowcnn
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import androidx.test.platform.app.InstrumentationRegistry
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import androidx.test.ext.junit.runners.AndroidJUnit4
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import org.junit.Test
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import org.junit.runner.RunWith
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import org.junit.Assert.*
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/**
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* Instrumented test, which will execute on an Android device.
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*
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* See [testing documentation](http://d.android.com/tools/testing).
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*/
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@RunWith(AndroidJUnit4::class)
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class ExampleInstrumentedTest {
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@Test
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fun useAppContext() {
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// Context of the app under test.
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val appContext = InstrumentationRegistry.getInstrumentation().targetContext
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assertEquals("com.example.tensorflowcnn", appContext.packageName)
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}
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}

‎Assignment3/TensorFlowCNN/app/src/main/AndroidManifest.xml

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<?xml version="1.0" encoding="utf-8"?>
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<manifest xmlns:android="http://schemas.android.com/apk/res/android"
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xmlns:tools="http://schemas.android.com/tools">
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<application
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android:allowBackup="true"
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android:dataExtractionRules="@xml/data_extraction_rules"
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android:fullBackupContent="@xml/backup_rules"
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android:icon="@mipmap/ic_launcher"
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android:label="@string/app_name"
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android:roundIcon="@mipmap/ic_launcher_round"
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android:supportsRtl="true"
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android:theme="@style/Theme.MySplashScreen"
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tools:targetApi="31">
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<activity
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android:name=".MainActivity"
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android:exported="true"
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android:label="@string/app_name"
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android:theme="@style/Theme.MySplashScreen">
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<intent-filter>
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<action android:name="android.intent.action.MAIN" />
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<category android:name="android.intent.category.LAUNCHER" />
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</intent-filter>
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</activity>
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</application>
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</manifest>

‎Assignment3/TensorFlowCNN/app/src/main/java/com/example/tensorflowcnn/ImagePicker.kt

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package com.example.tensorflowcnn
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import android.content.Context
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import android.graphics.Bitmap
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import android.graphics.ImageDecoder
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import android.net.Uri
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import android.os.Build
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import android.provider.MediaStore
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import androidx.activity.compose.rememberLauncherForActivityResult
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import androidx.activity.result.contract.ActivityResultContracts
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import androidx.compose.foundation.Image
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import androidx.compose.foundation.layout.Arrangement
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import androidx.compose.foundation.layout.Box
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import androidx.compose.foundation.layout.Column
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import androidx.compose.foundation.layout.Row
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import androidx.compose.foundation.layout.Spacer
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import androidx.compose.foundation.layout.fillMaxSize
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import androidx.compose.foundation.layout.fillMaxWidth
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import androidx.compose.foundation.layout.padding
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import androidx.compose.foundation.layout.size
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import androidx.compose.foundation.layout.width
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import androidx.compose.foundation.rememberScrollState
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import androidx.compose.foundation.shape.RoundedCornerShape
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import androidx.compose.foundation.verticalScroll
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import androidx.compose.material3.Button
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import androidx.compose.material3.ButtonDefaults
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import androidx.compose.material3.CardDefaults
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import androidx.compose.material3.ExperimentalMaterial3Api
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import androidx.compose.material3.Icon
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import androidx.compose.material3.MaterialTheme
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import androidx.compose.material3.OutlinedCard
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import androidx.compose.material3.Scaffold
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import androidx.compose.material3.Text
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import androidx.compose.material3.TopAppBar
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import androidx.compose.material3.TopAppBarDefaults
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import androidx.compose.runtime.Composable
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import androidx.compose.runtime.getValue
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import androidx.compose.runtime.mutableStateOf
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import androidx.compose.runtime.remember
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import androidx.compose.runtime.setValue
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import androidx.compose.ui.Alignment
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import androidx.compose.ui.Modifier
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import androidx.compose.ui.graphics.asImageBitmap
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import androidx.compose.ui.platform.LocalContext
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import androidx.compose.ui.res.painterResource
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import androidx.compose.ui.text.style.TextAlign
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import androidx.compose.ui.unit.dp
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import com.example.tensorflowcnn.tflite.ImageClassifier
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@OptIn(ExperimentalMaterial3Api::class)
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@Composable
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fun ImagePicker() {
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var imageUris by remember { mutableStateOf<List<Uri>?>(null) }
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val context = LocalContext.current
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val launcher = rememberLauncherForActivityResult(
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contract = ActivityResultContracts.GetMultipleContents(),
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onResult = { uris -> imageUris = uris }
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)
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Scaffold(
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modifier = Modifier.fillMaxSize(),
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topBar = {
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TopAppBar(
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title = { Text("Image Classifier") },
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colors = TopAppBarDefaults.smallTopAppBarColors(
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containerColor = MaterialTheme.colorScheme.primaryContainer,
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titleContentColor = MaterialTheme.colorScheme.onPrimaryContainer
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)
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)
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},
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content = { innerPadding ->
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Column(
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Modifier
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.fillMaxSize()
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.padding(innerPadding)
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.padding(horizontal = 16.dp)
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) {
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Box(
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Modifier
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.weight(1f)
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.fillMaxWidth()
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.verticalScroll(rememberScrollState()),
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contentAlignment = Alignment.Center
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) {
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if (imageUris.isNullOrEmpty()) {
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// Placeholder UI when no images are selected
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PlaceholderContent()
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} else {
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// Display images if available
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Column(Modifier.fillMaxWidth(), horizontalAlignment = Alignment.CenterHorizontally) {
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imageUris!!.chunked(2).forEach { rowUris ->
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Row(Modifier.fillMaxWidth(), horizontalArrangement = Arrangement.SpaceEvenly) {
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rowUris.forEach { uri ->
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ImageCard(context, uri)
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}
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}
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}
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}
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}
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}
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Button(
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onClick = { launcher.launch("image/*") },
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modifier = Modifier
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.fillMaxWidth()
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.padding(16.dp),
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colors = ButtonDefaults.buttonColors(
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containerColor = MaterialTheme.colorScheme.primaryContainer,
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contentColor = MaterialTheme.colorScheme.onPrimaryContainer
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)
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) {
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Text(text = "Pick images")
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}
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}
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}
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)
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}
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@Composable
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fun ImageCard(context: Context, uri: Uri) {
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val bitmap = loadImage(context, uri)
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bitmap?.let {
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OutlinedCard(
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modifier = Modifier
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.padding(8.dp)
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.width(175.dp),
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shape = RoundedCornerShape(16.dp),
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elevation = CardDefaults.elevatedCardElevation(
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defaultElevation = 4.dp
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)
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) {
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Column(
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Modifier.padding(16.dp),
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horizontalAlignment = Alignment.CenterHorizontally
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) {
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Image(
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bitmap = it.asImageBitmap(),
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contentDescription = "Selected image",
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modifier = Modifier.size(150.dp)
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)
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Spacer(modifier = Modifier.padding(4.dp))
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val resizedBitmap = resizeBitmap(it, ImageClassifier.imageSize, ImageClassifier.imageSize)
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ImageClassifier.Classify(resizedBitmap) { classification ->
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Text(
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text = classification,
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style = MaterialTheme.typography.bodyMedium,
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color = MaterialTheme.colorScheme.primary
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)
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}
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}
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}
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}
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}
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// Auxiliary function to load an image
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fun loadImage(context: Context, uri: Uri): Bitmap? {
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return if (Build.VERSION.SDK_INT < 28) {
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MediaStore.Images.Media.getBitmap(context.contentResolver, uri)
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} else {
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val source = ImageDecoder.createSource(context.contentResolver, uri)
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ImageDecoder.decodeBitmap(source) { decoder, _, _ ->
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decoder.allocator = ImageDecoder.ALLOCATOR_SOFTWARE
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decoder.isMutableRequired = true
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}
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}
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}
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fun resizeBitmap(source: Bitmap, width: Int, height: Int): Bitmap {
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return Bitmap.createScaledBitmap(source, width, height, true)
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}
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@Composable
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fun PlaceholderContent() {
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Box(Modifier.fillMaxSize(), contentAlignment = Alignment.Center) {
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Column(horizontalAlignment = Alignment.CenterHorizontally) {
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Icon(painter = painterResource(id = R.drawable.placeholder), contentDescription = "Placeholder", modifier = Modifier.size(120.dp))
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Text("No images selected. Click the button below to choose images.", textAlign = TextAlign.Center)
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}
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}
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}

‎Assignment3/TensorFlowCNN/app/src/main/java/com/example/tensorflowcnn/MainActivity.kt

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package com.example.tensorflowcnn
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import android.os.Bundle
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import androidx.activity.ComponentActivity
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import androidx.activity.compose.setContent
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import androidx.compose.foundation.layout.fillMaxSize
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import androidx.compose.material3.MaterialTheme
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import androidx.compose.material3.Surface
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import androidx.compose.material3.Text
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import androidx.compose.runtime.Composable
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import androidx.compose.ui.Modifier
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import androidx.compose.ui.tooling.preview.Preview
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import com.example.tensorflowcnn.ui.theme.TensorflowcnnTheme
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class MainActivity : ComponentActivity() {
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override fun onCreate(savedInstanceState: Bundle?) {
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super.onCreate(savedInstanceState)
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setContent {
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TensorflowcnnTheme {
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// A surface container using the 'background' color from the theme
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Surface(
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modifier = Modifier.fillMaxSize(),
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color = MaterialTheme.colorScheme.background
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) {
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ImagePicker()
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}
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}
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}
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}
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}

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