I have converted and saved a base64 string to a pdf file. Currently, I have the following code to open the PDF:
public void Pdf(string blob)
{
try
{
string filePath = System.IO.Path.Combine(System.Environment.GetFolderPath(System.Environment.SpecialFolder.MyDocuments), "agremeent.pdf");
try
{
if (blob != null)
{
Java.IO.File file = new Java.IO.File(filePath);
if (!file.Exists())
{
file.Delete();
}
fos = new FileOutputStream(filePath);
var bytes = Base64.Decode(blob, Base64Flags.Default);
fos.Write(bytes);
fos.Flush();
fos.Close();
}
}
catch (Exception e)
{
}
finally
{
if (fos != null)
{
fos = null;
}
}
Android.Net.Uri url = Android.Net.Uri.Parse(filePath);
Intent target = new Intent(Intent.ActionView);
target.SetDataAndType(url, "application/pdf");
Intent intent = Intent.CreateChooser(target, "Open File");
try
{
StartActivity(intent);
}
catch (ActivityNotFoundException e)
{
// Instruct the user to install a PDF reader here, or something
}
}
catch
{
}
}
This lets user choose which PDF viewer they would like to use to open the PDF. But, the PDF isn't opening in Google Drive. What is causing this? Is there a way to open the PDF without leaving the app and using a third party viewer?
Answer: You can use the Xamarin.Bindings.PDFView-Android package and create an activity to show the pdf. It can make Android display the pdf easily. Such as: MainActicity.xml:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.pdfview.PDFView
android:id="@+id/pdfview"
android:layout_height="match_parent"
android:layout_width="match_parent"/>
</LinearLayout>
MainActivity.cs:
protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
Xamarin.Essentials.Platform.Init(this, savedInstanceState);
// Set our view from the "main" layout resource
SetContentView(Resource.Layout.activity_main);
string filePath = System.IO.Path.Combine(System.Environment.GetFolderPath(System.Environment.SpecialFolder.MyDocuments), "agremeent.pdf");
var pdfview = this.FindViewById<PDFView>(Resource.Id.pdfview);
Java.IO.File file = new Java.IO.File(filePath);
pdfview.FromFile(file).Show();
}
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