failed to resolve com.android.support:appcompat-v7:22 and com.android.support:recyclerview-v7:21.1.2

These are the correct version that you can add in your build.gradle according to the API needs. API 24: implementation ‘com.android.support:appcompat-v7:24.2.1’ implementation ‘com.android.support:recyclerview-v7:24.2.1’ API 25: implementation ‘com.android.support:appcompat-v7:25.4.0’ implementation ‘com.android.support:recyclerview-v7:25.4.0’ API 26: implementation ‘com.android.support:appcompat-v7:26.1.0’ implementation ‘com.android.support:recyclerview-v7:26.1.0’ API 27: implementation ‘com.android.support:appcompat-v7:27.1.1’ implementation ‘com.android.support:recyclerview-v7:27.1.1’

How to render pdfs using C#

Google has open sourced its excellent PDF rendering engine – PDFium – that it wrote with Foxit Software. There is a C# nuget package called PdfiumViewer which gives a C# wrapper around PDFium and allows PDFs to be displayed and printed. I have used it and was very impressed with the quality of the rendering. … Read more

How does glDrawArrays know what to draw?

The call to glBindBuffer tells OpenGL to use vertexBufferObject whenever it needs the GL_ARRAY_BUFFER. glEnableVertexAttribArray means that you want OpenGL to use vertex attribute arrays; without this call the data you supplied will be ignored. glVertexAttribPointer, as you said, tells OpenGL what to do with the supplied array data, since OpenGL doesn’t inherently know what … Read more

Flutter (Dart): Exceptions caused by rendering / A RenderFlex overflowed

This is a pretty common issue to run into, especially when you start testing your app on multiple devices and orientations. Flutter’s Widget gallery has a section covering the various scrolling widgets: https://flutter.io/widgets/scrolling/ I’d recommend either wrapping your entire content in a SingleChildScrollView, or using a scrolling ListView. EDIT: This question and answer have gotten … Read more

In what order are Panels the most efficient in terms of render time and performance?

I think it is more concise and understandable to describe the performance characteristics of each panel than it is to try to give an absolute relative performance comparison. WPF makes two passes when rendering content: Measure and Arrange. Each panel has different performance characteristics for each of these two passes. The performance of the measure … Read more

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)