如何存储抽拉以阵列 [英] How to store drawable in an array

问题描述

我想下载一些图片，并想将其存储在一个数组绘制。于是，我就宣告绘制array.But它，当我访问数组返回我空指针例外。

I want to download a bunch of images and would like to store it as drawable in an array. So I tried declaring a drawable array.But it returns me nullPointer exception when I access that array.

我的问题是，如何声明数组类型为绘制？

My question is, how to declare an array type as drawable ?

推荐答案

可绘制的数组定义应该像：

an array of drawables would be declared like:

int numDrawables = 10;
Drawable[] drawableArray = new Drawable[numDrawables];

要填充数组：

for(int i = 0; i < numDrawables; i++){
    // get a drawable from somewhere
    Drawable drawable = new Drawable();
    drawableArray[i] = drawable;
}

要访问数组：

Drawable aDrawable = drawableArray[0];

这是基本的Java，如果您收到空指针异常，你正在做的事情是错误的。

This is basic java, If you are getting null pointer exceptions, you are doing something wrong.

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