Android的getResources（）非Activity类 [英] android getResources() from non-Activity class

问题描述

我试图加载我从顶点数组资产/ model.txt
我有OpenGLActivity，GLRenderer和为MyModel类
我加入这行来OpenGLActivity：

I'm trying to load my vertices array from assets/model.txt I have OpenGLActivity, GLRenderer and Mymodel classes i added this line to the OpenGLActivity:

public static Context context;

和这为MyModel类：

And this to Mymodel class:

Context context = OpenGLActivity.context;
    AssetManager am = context.getResources().getAssets();
    InputStream is = null;
    try {
        is = am.open("model.txt");
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    Scanner s = new Scanner(is);
    long numfloats = s.nextLong();
    float[] vertices = new float[(int) numfloats];
    for (int ctr = 0; ctr < vertices.length; ctr++) {
        vertices[ctr] = s.nextFloat();
    }

但does'n工作（

But it does'n work (

推荐答案

我发现在Android中它不要在静态变量对它们的引用与活动（以及大多数其他类）非常重要。我会尽量避免他们不惜一切代价，他们热爱导致内存泄漏。但有一个例外，该应用程序对象的引用，这当然是一个上下文的。保持在一个静态的引用，这决不会泄漏内存。

I have found in Android it is very important with Activities (and most other classes) not to have references to them in static variables. I try to avoid them at all costs, they love causing memory leaks. But there is one exception, a reference to the application object, which is of course a Context. Holding a reference in a static to this will never leak memory.

所以我做什么，如果我真的需要有对资源的全球背景是扩展应用程序对象，并添加静态get函数的上下文。

So what I do if I really need to have a global context for resources is to extend the Application object and add a static get function for the context.

In the manifest do....
<application    android:name="MyApplicationClass" ...your other bits....>

和Java中....

And in Java....

public class MyApplicationClass extends Application
{
   private Context appContext;

    @Override
    public void onCreate()
    {//Always called before anything else in the app
     //so in the rest of your code safe to call MyApplicationClass.getContext();
         super.onCreate();
         appContext = this;
    }

    public static Context getContext()
    {
         return appContext;
    }
}

这篇关于Android的getResources（）非Activity类的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！