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Binding Captured Image in ImageView it shows NullReferenceException in Xamarin Android
Mohanasundharam
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//Permissions
<uses-permission android:name="android.permission.CAMERA" /> <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
//for open camera
private void goCamera(object sender,EventArgs args)
{
Intent intent = new Intent(MediaStore.ActionImageCapture);
StartActivityForResult(intent, REQUEST_TAKE_PHOTO);
}
//for handle the result
protected override void OnActivityResult(int requestCode, [GeneratedEnum] Result resultCode, Intent data)
{
base.OnActivityResult(requestCode, resultCode, data);
Bitmap bitMap = (Bitmap)data.Extras.Get("data");
pictureViewer.SetImageBitmap(bitMap);
}
Here the data(Intent) result is getting null, how to resolve this issue?
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Best Answer
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Mohanasundharam
Member ✭✭✭
I just solved this problem with Storage, by using this tutorial, https://c-sharpcorner.com/article/xamarin-android-create-android-own-camera-app/
0
Answers
I created a new app and it worked properly.The effect is as follows:
Maybe you faced a permission issue. An app that targets Android 6.0 or higher must always perform a runtime permission check.
You can refer to the following link to add a runtime permission check.
https://docs.microsoft.com/en-us/xamarin/android/app-fundamentals/permissions?tabs=vswin
Besides, you can use the package Permissions.Plugin
For more details: https://devblogs.microsoft.com/xamarin/requesting-runtime-permissions-in-android-marshmallow/
I have checked all the permissions and all the things, i think all are ok. But still it was not binding the captured image in ImageView
Hi, @Mohanasundharam
Could you please post a basic demo so that we can test with it?
Yes. I need the output like your first reply for this question
What do you mean by the words
I need the output like your first reply for this question?yes, you asked me a basic demo right, that's why i said like that, is there any wrong understanding, sorry for that
Well, I just asked you for a basic demo to test . I guess our code should be different in some place.
I have created a simple demo which runs properly.
The whole app is in the attachment you can check it.
Well, Thank you @jezh
I have an another issue @jezh, which i installed this app in new device it doesn't show the runtime permission pop-up and automatically it enabled.
the log is,
04-26 18:47:44.647 W/ActivityThread(11712): handleWindowVisibility: no activity for token [email protected]
Resolved pending breakpoint at 'MainPagePicCamera.cs:78,1' to void POC.Pic_Camera.MainPagePicCamera.OnActivityResult (int requestCode, Android.App.Result resultCode, Android.Content.Intent data) [0x00035].
Resolved pending breakpoint at 'MainPagePicCamera.cs:80,1' to void POC.Pic_Camera.MainPagePicCamera.OnActivityResult (int requestCode, Android.App.Result resultCode, Android.Content.Intent data) [0x00036].
Resolved pending breakpoint at 'MainPagePicCamera.cs:85,1' to void POC.Pic_Camera.MainPagePicCamera.OnActivityResult (int requestCode, Android.App.Result resultCode, Android.Content.Intent data) [0x0005f].
04-26 18:47:44.797 W/POC.POC (11712): JNI RegisterNativeMethods: attempt to register 0 native methods for md5eae3ad6ed1b7f6713979aa7524906105.CircleImageView
04-26 18:47:44.799 D/Mono (11712): DllImport searching in: '__Internal' ('(null)').
04-26 18:47:44.799 D/Mono (11712): Searching for 'java_interop_jnienv_get_object_array_element'.
04-26 18:47:44.799 D/Mono (11712): Probing 'java_interop_jnienv_get_object_array_element'.
04-26 18:47:44.800 D/Mono (11712): Found as 'java_interop_jnienv_get_object_array_element'.
04-26 18:47:44.820 D/Mono (11712): DllImport searching in: '__Internal' ('(null)').
04-26 18:47:44.820 D/Mono (11712): Searching for 'java_interop_jnienv_new_local_ref'.
04-26 18:47:44.820 D/Mono (11712): Probing 'java_interop_jnienv_new_local_ref'.
04-26 18:47:44.820 D/Mono (11712): Found as 'java_interop_jnienv_new_local_ref'.
04-26 18:47:44.876 I/POC.POC (11712): Compiler allocated 4MB to compile void android.widget.TextView.(android.content.Context, android.util.AttributeSet, int, int)
04-26 18:47:47.636 D/Mono (11712): Assembly Ref addref POC[0x74866dce80] -> Xamarin.Android.Support.Compat[0x747c8ab000]: 4
04-26 18:47:47.637 I/Pic Camera(11712): Show camera button pressed. Checking permission.
04-26 18:47:47.640 I/Pic Camera(11712): ************CAMERA permission has already been granted. Displaying camera preview.
04-26 18:47:47.981 D/OpenGLRenderer(11712): endAllActiveAnimators on 0x7467915f00 (MenuPopupWindow$MenuDropDownListView) with handle 0x7467968c20
No Picture Captured!
04-26 18:47:53.759 I/POC.POC (11712): CollectorTransition concurrent copying GC freed 9578(547KB) AllocSpace objects, 4(208KB) LOS objects, 49% free, 1928KB/3MB, paused 63us total 163.923ms
04-26 18:47:53.780 D/Mono (11712): DllImport attempting to load: '/system/lib64/liblog.so'.
04-26 18:47:53.781 D/Mono (11712): DllImport loaded library '/system/lib64/liblog.so'.
04-26 18:47:53.781 D/Mono (11712): DllImport searching in: '/system/lib64/liblog.so' ('/system/lib64/liblog.so').
04-26 18:47:53.781 D/Mono (11712): Searching for '__android_log_print'.
04-26 18:47:53.781 D/Mono (11712): Probing '__android_log_print'.
04-26 18:47:53.781 D/Mono (11712): Found as '__android_log_print'.
04-26 18:47:53.782 I/mono-stdout(11712): No Picture Captured!
and the captured result(intent data) value is null, which means the data is null, so the result like "No Picture Captured!"
What Android device are you using? What is the API version?
I just solved this problem with Storage, by using this tutorial, https://c-sharpcorner.com/article/xamarin-android-create-android-own-camera-app/
Congrats, and thanks for sharing the solution.