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‎.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
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# IDE folders #
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gen/
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bin/
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out/
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.idea/*
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!.idea/codeStyleSettings.xml
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!.idea/encodings.xml
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!.idea/inspectionProfiles/
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# Gradle files
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.gradle/
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*build/

‎app/.gitignore‎

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/build

‎app/build.gradle‎

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plugins {
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id 'com.android.application'
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id 'kotlin-android'
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}
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android {
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compileSdk 30
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defaultConfig {
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applicationId "com.tomclaw.imageloader"
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minSdk 21
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targetSdk 30
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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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}
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buildTypes {
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release {
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minifyEnabled false
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proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
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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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}
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dependencies {
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implementation 'androidx.core:core-ktx:1.6.0'
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implementation 'androidx.appcompat:appcompat:1.3.1'
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implementation 'com.google.android.material:material:1.4.0'
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implementation 'androidx.constraintlayout:constraintlayout:2.1.0'
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implementation 'com.github.solkin:disk-lru-cache:1.4'
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testImplementation 'junit:junit:4.+'
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androidTestImplementation 'androidx.test.ext:junit:1.1.3'
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androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
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}

‎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

‎app/src/androidTest/java/com/tomclaw/imageloader/ExampleInstrumentedTest.kt‎

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package com.tomclaw.imageloader
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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.tomclaw.imageloader", appContext.packageName)
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}
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}

‎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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package="com.tomclaw.imageloader">
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<uses-permission android:name="android.permission.INTERNET" />
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<application
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android:allowBackup="true"
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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.SimpleImageLoader">
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<activity
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android:name=".MainActivity"
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android:exported="true">
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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>

‎app/src/main/java/com/tomclaw/imageloader/BitmapDecoder.kt‎

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package com.tomclaw.imageloader
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import android.graphics.Bitmap
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import android.graphics.BitmapFactory
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import android.graphics.Matrix
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import android.media.ExifInterface
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import java.io.BufferedInputStream
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import java.io.File
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import java.io.FileInputStream
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import java.io.IOException
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import java.io.InputStream
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interface BitmapDecoder {
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fun getBitmap(file: File, reqWidth: Int, reqHeight: Int): Bitmap?
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}
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class BitmapDecoderImpl() : BitmapDecoder {
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override fun getBitmap(
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file: File,
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reqWidth: Int,
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reqHeight: Int
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): Bitmap? {
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var bitmap: Bitmap?
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var inputStream: InputStream? = null
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try {
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inputStream = FileInputStream(file)
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bitmap = decodeSampledBitmapFromStream(inputStream, reqWidth, reqHeight)
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val rotation = getRotation(file)
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if (bitmap != null && rotation != 0) {
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val width = bitmap.width
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val height = bitmap.height
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val m = Matrix()
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m.setRotate(rotation.toFloat(), (width / 2).toFloat(), (height / 2).toFloat())
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bitmap = Bitmap.createBitmap(bitmap, 0, 0, width, height, m, false)
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}
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} catch (ignored: Throwable) {
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ignored.printStackTrace()
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bitmap = null
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} finally {
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if (inputStream != null) {
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try {
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inputStream.close()
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} catch (ignored: IOException) {
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}
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}
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}
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return bitmap
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}
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private fun decodeSampledBitmapFromStream(
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stream: InputStream,
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reqWidth: Int,
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reqHeight: Int
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): Bitmap? {
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var bitmap: Bitmap?
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try {
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val inputStream: InputStream = BufferedInputStream(stream, THUMBNAIL_BUFFER_SIZE)
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inputStream.mark(THUMBNAIL_BUFFER_SIZE)
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// First decode with inJustDecodeBounds=true to check dimensions
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val options = BitmapFactory.Options()
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options.inJustDecodeBounds = true
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BitmapFactory.decodeStream(inputStream, null, options)
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// Calculate inSampleSize
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val widthSample = (options.outWidth / reqWidth).toFloat()
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val heightSample = (options.outHeight / reqHeight).toFloat()
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var scaleFactor = Math.max(widthSample, heightSample)
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if (scaleFactor < 1) {
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scaleFactor = 1f
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}
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options.inJustDecodeBounds = false
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options.inSampleSize = scaleFactor.toInt()
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options.inPreferredConfig = Bitmap.Config.RGB_565
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// Decode bitmap with inSampleSize set
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inputStream.reset()
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bitmap = BitmapFactory.decodeStream(inputStream, null, options)
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} catch (ignored: Throwable) {
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ignored.printStackTrace()
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bitmap = null
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}
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return bitmap
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}
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private fun getRotation(file: File): Int {
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return when (obtainFileOrientation(file.absolutePath)) {
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ExifInterface.ORIENTATION_ROTATE_90, ExifInterface.ORIENTATION_TRANSPOSE -> 90
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ExifInterface.ORIENTATION_ROTATE_180, ExifInterface.ORIENTATION_FLIP_VERTICAL -> 180
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ExifInterface.ORIENTATION_ROTATE_270, ExifInterface.ORIENTATION_TRANSVERSE -> 270
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else -> 0
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}
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}
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private fun obtainFileOrientation(fileName: String): Int {
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return try {
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val exifInterface = ExifInterface(fileName)
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exifInterface.getAttributeInt(
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ExifInterface.TAG_ORIENTATION,
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ExifInterface.ORIENTATION_NORMAL
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)
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} catch (ex: IOException) {
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ExifInterface.ORIENTATION_UNDEFINED
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}
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}
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}
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/**
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* Buffer is large enough to rewind past any EXIF headers.
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*/
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private const val THUMBNAIL_BUFFER_SIZE = 128 * 1024

‎app/src/main/java/com/tomclaw/imageloader/DiskCache.kt‎

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package com.tomclaw.imageloader
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import com.tomclaw.cache.DiskLruCache
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import java.io.File
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interface DiskCache {
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fun get(key: String): File?
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fun put(key: String, file: File): File
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fun remove(key: String)
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}
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class DiskCacheImpl(private val diskLruCache: DiskLruCache): DiskCache {
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override fun get(key: String): File? {
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return diskLruCache[key]
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}
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override fun put(key: String, file: File): File {
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return diskLruCache.put(key, file)
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}
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override fun remove(key: String) {
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diskLruCache.delete(key)
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}
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}

‎app/src/main/java/com/tomclaw/imageloader/FileDownloader.kt‎

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package com.tomclaw.imageloader
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import java.io.File
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import java.io.FileOutputStream
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import java.net.HttpURLConnection
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import java.net.URL
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interface FileDownloader {
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fun download(url: String, file: File): Boolean
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}
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class FileDownloaderImpl() : FileDownloader {
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override fun download(url: String, file: File): Boolean {
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val connection = openConnection(url)
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val fileStream = FileOutputStream(file)
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return connection.inputStream
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?.takeIf { connection.responseCode in 200..299 }
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?.safeCopyTo(fileStream)
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?.takeIf { true } ?: false
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}
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private fun openConnection(url: String): HttpURLConnection {
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val u = URL(url)
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return (u.openConnection() as HttpURLConnection).apply {
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requestMethod = METHOD_GET
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doInput = true
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doOutput = false
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connectTimeout = TIMEOUT_CONNECTION
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readTimeout = TIMEOUT_SOCKET
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}
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}
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}
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private const val METHOD_GET = "GET"
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private const val TIMEOUT_SOCKET = 70 * 1000
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private const val TIMEOUT_CONNECTION = 60 * 1000

‎app/src/main/java/com/tomclaw/imageloader/FileProvider.kt‎

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package com.tomclaw.imageloader
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import android.net.Uri
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import java.io.File
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import java.io.IOException
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interface FileProvider {
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fun getFile(uri: Uri): File? {
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return when (uri.scheme) {
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"http", "https" -> getFile(uri.path.orEmpty())
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else -> null
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}
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}
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fun getFile(url: String): File?
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}
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class FileProviderImpl(
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private val cacheDir: File,
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private val diskCache: DiskCache,
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private val fileDownloader: FileDownloader
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) : FileProvider {
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override fun getFile(url: String): File? {
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return diskCache.get(url) ?: downloadIntoCache(url)
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}
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private fun downloadIntoCache(url: String): File? {
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var tempFile: File? = null
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try {
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tempFile = File.createTempFile("file", ".tmp", cacheDir)
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return fileDownloader.download(url, tempFile)
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.takeIf { true }
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?.let { diskCache.put(url, tempFile) }
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} catch (ex: IOException) {
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ex.printStackTrace()
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} finally {
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tempFile?.delete()
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}
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return null
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}
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}

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