Hello,
I've run across a problem trying to retrieve an image from the web and
decode the stream or byte array into a bitmap/drawable resource. Each
one of the tests below fail when I try to invoke the static
BitmapFactory or BitmapDrawable class. I'm running my tests in
MonoDevelop on Mac OSX Lion targeting API Level 8 with Mono for
Android 1.2.
The exception I receive for test 1:
System.NullReferenceException: Object reference not set to an instance
of an object
at Android.Runtime.JNIEnv.get_Handle () [0x00014] in
/Volumes/Macintosh
HD/Users/jon/Development/xamarin/monodroid/Mono.Android/src/Runtime/JNIEnv.cs:33
at Android.Runtime.JNIEnv.get_Env () [0x00000] in /Volumes/Macintosh
HD/Users/jon/Development/xamarin/monodroid/Mono.Android/src/Runtime/JNIEnv.cs:24
at Android.Runtime.JNIEnv.FindClass (System.String classname)
[0x00000] in /Volumes/Macintosh
HD/Users/jon/Development/xamarin/monodroid/Mono.Android/src/Runtime/JNIEnv.cs:145
at Android.Graphics.BitmapFactory..cctor () [0x00000] in <filename unknown>:0
The exception I receive for test 2:
System.NullReferenceException: Object reference not set to an instance
of an object
at Android.Runtime.JNIEnv.get_Handle () [0x00014] in
/Volumes/Macintosh
HD/Users/jon/Development/xamarin/monodroid/Mono.Android/src/Runtime/JNIEnv.cs:33
at Android.Runtime.JNIEnv.get_Env () [0x00000] in /Volumes/Macintosh
HD/Users/jon/Development/xamarin/monodroid/Mono.Android/src/Runtime/JNIEnv.cs:24
at Android.Runtime.JNIEnv.FindClass (System.String classname)
[0x00000] in /Volumes/Macintosh
HD/Users/jon/Development/xamarin/monodroid/Mono.Android/src/Runtime/JNIEnv.cs:145
at Android.Graphics.BitmapFactory..cctor () [0x00000] in <filename unknown>:0
The exception I receive for test 3:
System.NullReferenceException: Object reference not set to an instance
of an object
at Android.Runtime.JNIEnv.get_Handle () [0x00014] in
/Volumes/Macintosh
HD/Users/jon/Development/xamarin/monodroid/Mono.Android/src/Runtime/JNIEnv.cs:33
at Android.Runtime.JNIEnv.get_Env () [0x00000] in /Volumes/Macintosh
HD/Users/jon/Development/xamarin/monodroid/Mono.Android/src/Runtime/JNIEnv.cs:24
at Android.Runtime.JNIEnv.FindClass (System.String classname)
[0x00000] in /Volumes/Macintosh
HD/Users/jon/Development/xamarin/monodroid/Mono.Android/src/Runtime/JNIEnv.cs:145
at Android.Graphics.Drawables.Drawable..cctor () [0x00000] in
<filename unknown>:0
Any help would be greatly appreciated.
Regards,
John
//////////////////////////////////////////////////////////
using System;
using System.Net;
using Android.Graphics;
using Android.Graphics.Drawables;
using NUnit.Framework;
namespace App.Shared.Test
{
[TestFixture]
public class ImageTest
{
private string url =
"http://www.google.com/intl/en_com/images/srpr/logo3w.png";;
[Test]
public void TestStreamWithBitmapFactory()
{
try
{
System.IO.Stream stream = new
WebClient().OpenRead(url);
var bitmap = BitmapFactory.DecodeStream(stream);
Assert.IsNotNull(bitmap);
}
catch (Exception ex)
{
Console.WriteLine(ex.InnerException);
Assert.Fail(ex.InnerException.ToString());
}
}
[Test]
public void TestBytesWithBitmapFactory()
{
try
{
byte[] bytes = new
WebClient().DownloadData(url);
var bitmap =
BitmapFactory.DecodeByteArray(bytes, 0, bytes.Length);
Assert.IsNotNull(bitmap);
}
catch (Exception ex)
{
Console.WriteLine(ex.InnerException);
Assert.Fail(ex.InnerException.ToString());
}
}
[Test]
public void TestStreamWithBitmapDrawable()
{
try
{
System.IO.Stream stream = new
WebClient().OpenRead(url);
var bitmap =
BitmapDrawable.CreateFromStream(stream, "src");
Assert.IsNotNull(bitmap);
}
catch (Exception ex)
{
Console.WriteLine(ex.InnerException);
Assert.Fail(ex.InnerException.ToString());
}
}
}
}
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![http://www.google.com/intl/en_com/images/srpr/logo3w.png"](https://www.google.com/intl/en_com/images/srpr/logo3w.png"){kind=link}