Android – Update from targetSDK 28 to 29

Can’t create file

Need to add android:requestLegacyExternalStorage=”true”

https://developer.android.com/training/data-storage/use-cases#opt-out-scoped-storage

    <application
        ...
        android:requestLegacyExternalStorage="true">

Can’t get hardware serial number

App crashes when calling Build.getSerial()

best-practices-android-identifiers https://developer.android.com/reference/android/os/Build#getSerial()
changes-to-device-identifiers-in.html

The user 10180 does not meet the requirements to access device identifiers.

Use ANDROID_ID for Android 10, 11; Build.getSerial() for lower Android

    private String getAndroidId() {
        return Settings.Secure.getString(context.getContentResolver(),
                Settings.Secure.ANDROID_ID);
    }

Can’t download file using DownloadManager

Error when dowloading file using setDestinationInExternalPublicDir
Not one of standard directories: /packagename/files

setDestinationInExternalPublicDir

String storagePath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/test/files"; // /storage/emulated/0/test/files

if (Build.VERSION.SDK_INT >= 29) {
    // Android 10, 11
    Uri dstUri = Uri.parse("file://" + storagePath + File.separator + targetFilename);
    dm.enqueue(request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI | DownloadManager.Request.NETWORK_MOBILE)
        .setAllowedOverRoaming(false)
        .setTitle("File Downloading...")
        .setDescription("File Download")
        .setDestinationUri(dstUri));
} else {
    dm.enqueue(request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI | DownloadManager.Request.NETWORK_MOBILE)
        .setAllowedOverRoaming(false)
        .setTitle("File Downloading...")
        .setDescription("File Download")
        .setDestinationInExternalPublicDir("/test/files", targetFilename));
}

Camera stops saving image

Before (Xamarin)

takePictureIntent.PutExtra(MediaStore.ExtraOutput, Android.Net.Uri.FromFile(imageFile));

After (Xamarin)

var context = MainActivity.Instance.ApplicationContext;
var imageUri = AndroidX.Core.Content.FileProvider.GetUriForFile(context, context.PackageName + ".provider", imageFile);

takePictureIntent.PutExtra(MediaStore.ExtraOutput, imageUri);