从资产文件夹加载图像有不同的尺寸比RES /绘 [英] Image loaded from assets folder comes in different size than res/drawable

问题描述

在我的项目，我dinamically加载图片来自绘制，华电国际到一个文件夹 ImageSwitcher 是这样的：

In my project I was loading images dinamically from the folder drawable-hdpi into an ImageSwitcher like this:

int[] images = new int[2];
logoImage = (ImageSwitcher) findViewById(R.id.logo_image);
images[0] = getResources().getIdentifier(ej.getImagemResource(), "drawable", getPackageName());
images[1] = getResources().getIdentifier(ej.getImagemResolvidaResource(), "drawable", getPackageName());
//...
logoImage.setImageResource(images[0]);

但对于设计的问题，因为它会像600百利特图片300×300像素，每个像素，我决定把它们全部注入资产的文件夹，并开始加载它们，如：

but for design issues, since it will be like 600 hundred little images 300 x 300 pixels each I decided to put them all into the assets folder and start to load them like:

Drawable[] images = new Drawable[2];
images[0] = Drawable.createFromStream(getAssets().open(ej.getImagemResource() + ".png"), null);
images[1] = Drawable.createFromStream(getAssets().open(ej.getImagemResolvidaResource() + ".png"), null);
//...

问题是，在第二种方式显示图像尺寸非常不同取决于器件密度（我猜的），但是当图像被放入绘制，华电国际的文件夹，他们中的任何密度显示就好了。

The problem is that in the second way the image size is displayed very differently depending on the device density (I guess), but when the images were into the drawable-hdpi folder they were displayed just fine in any density.

我该如何解决这个问题？或者是有有600几百张图片到绘制，华电国际文件夹中的一个问题？这是正确的方式做到这一点？

How do I solve this? Or is there a problem to have 600 hundred images into the drawable-hdpi folder? Which is the 'right' way to do this?

在此先感谢

推荐答案

当你把一个位图在 drawable-＆LT;密度＆GT; 文件夹中，并没有变种该设备的精确显示密度，框架会自动规模考虑它的比例＆LT;密度方式＆gt; 和设备的密度

When you put a bitmap in a drawable-<density> folder, and there is no variant for the device's exact display density, the framework will auto-scale it considering the ratio between <density> and the device's density.

这是这样做的图片尺寸，在DPS ，仍然设备（和你是不是从每个可能的密度提供一个变种义务）。

This is done so that the image dimensions, in dps, remains constant between devices (and that you are not obligated from providing a variant for each possible density).

当你从资产加载，源密度是未知的，所以不执行此自动缩放。因此，差

When you load from assets, the "source" density is unknown, so this autoscaling is not performed. Hence, the difference.

如果您想从资产加载图像的就好像它是华电国际的，你可以这样做：

If you want to load the image from the assets "as if it were hdpi", you can do something like:

Options opts = new BitmapFactory.Options();
opts.inDensity = DisplayMetrics.DENSITY_HIGH;
drawable = Drawable.createFromResourceStream(context.getResources(), null, is, srcName, opts);

这是说，我没有看到在所有的问题，包括绘制文件夹中的所有文件。

That said, I don't see any problems at all with including all the files in drawable folders.

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