I’ve integrated a QRCode scanner into my app and it worked fine on my old Android 5 device but throws the error Camera: Camera new cameraInitNormal:-13 on Android 8. To fix this You have to integrate some code to check if permission is already granted by the user and in case it is not, request…
Motivation When you are building an Android App you finally want to publish it in the Google Play Store. To achieve this you need to build an signed app bundle in Android Studio first Settings Select build variant “release” Go to Build -> Select Build Variant Now a new tool window becomes visible. Select “release”…
AOSP is the Android Open Spurce Project Architecture Source Code is hosted here: https://android.googlesource.com/platform/manifest Google uses repo (basically a git wrapper written in python) to clone the source code. You can find the instructions here: https://source.android.com/setup/build/downloading Further Reading What is Ninja? What is kapt? Anatomy of a Gradle file
As mentioned in What is ProGuard? R8 is the new kid on the block for shrinking and optimizing code. App Gradle android { buildTypes { release { minifyEnabled true shrinkResources true proguardFiles getDefaultProguardFile( ‘proguard-android-optimize.txt’), ‘proguard-rules.pro’ } } https://developer.android.com/studio/build/shrink-code
Perhaps you noticed the file proguard-rules.pro in your app directory? Why do we need that? ProGuard ProGuard has three use cases: shrinking obfuscating optimizing Code shrinking Often called “tree shaking”, shrinking optimizes the byte code by removing unused code. Resource shrinking After code shrinking all non-referenced resources will be removed as well Obfuscation This step…
A Snackbar is a replacement for Toasts in Android. Dependency implementation ‘com.google.android.material:material:1.4.0’ Layout A snackbar must be tied to a coordinator layout. If you use fragments the standard layout is FrameLayout which can be directly swapped with: <androidx.coordinatorlayout.widget.CoordinatorLayout Snackbar val snackbar = Snackbar.make( binding.root, “No internet connection! Please enable WiFi or Mobile Data”, Snackbar.LENGTH_INDEFINITE )…
Motivation Sometimes you want to redirect the user from your app to the website for e.g. imprint and data protection info. So it can be helpful to open up a website directly from your app. Implementation In Switch between activities you learned that the standard way of switching between activities is an intent. The same…
Gradle has built-in capabilities to generate a dependency graph of all packages used in the application. Gradle Tools gradle app:dependencies Command line Windows .\gradlew.bat app:dependencies Linux / macOS ./gradlew app:dependencies Further Reading Anatomy of a Gradle file How to add local jar files to your gradle dependencies How to enable R8 in your build process
versionCode 1versionName “0.1” versionName is a string which is visible to the user in the settings menu under App Info versionCode is an integer. It is used to compare APK updates against each other to make sure apps aren’t downgraded. val packageInfo: PackageInfo = this.packageManager.getPackageInfo(this.packageName, 0)Log.d(packageInfo.versionName)Log.d(packageInfo.versionCode) Further Reading Anatomy of a Gradle file Depdencency Graph…
In this article I show you how to use timber for logging in your Android App. Timber is built upon Android’s Log class. If you are not yet familiar with logging in Android have a look at Logging in Android