Posts Tagged ‘Matrix’
Android: Change color of the standard button inside Activity
Posted by Dimitri | Filed under Programming
This post explains how to change the color of the standard Android button. It also shows how to change the color of the text inside those buttons. It goes into detail on how to create a ColorFilter effect that changes the color of the button using three different approaches . The code featured in this post has been tested on Android 2.1, 2.2, 2.3 and 4.0.
Before starting, a little advice: know that changing the color of the standard Android button through XML is an easier and more straightforward approach. For that, please refer to the link Custom color buttons for Android (9-Patch). If the button color isn’t going to be changed after the application is initialized, then use XML. If that isn’t the case, then do it programmatically, which is what this tutorial focuses on.
So, here’s the code: (more…)
Android OpenGL: Get the ModelView Matrix on Cupcake (1.5)
Posted by Dimitri | Filed under Programming
One of the most annoying things when developing apps with OpenGL in Android 1.5, is the fact that there’s no access to the ModelView or the Projection matrices. It is not possible to call the glGetFloatv function because it wasn’t implemented until OpenGL ES 1.1, which isn’t available in the Cupcake versions. So, how to get the ModelView matrix on Android 1.5? The first thing you are going to do is grab these three classes: MatrixGrabber, MatrixStack and MatrixTrackingGL. All of them are inside the API demos, under the package com.example.android.apis.graphics.spritetext.
You're going to need these.