android开发文档之resource-drawable用法

Android developer文档中有对resource的drawable进行详细介绍

现在我们就一一介绍：

Bitmap File

A bitmap file is a

.png

,

.jpg

, or

.gif

file.
Android creates a

Drawable

resource for
any of these files when you save them in the

res/drawable/

directory.

文件路径

res/drawable/filename.png

(

.png

,

.jpg

,
or

.gif

)

The filename is used as the resource ID.compiled resource datatype:Resource pointer to a

BitmapDrawable

.引用方式：In Java:

R.drawable.filename

In XML:

@[package:]drawable/filename

example:With an image saved at

res/drawable/myimage.png

, this layout XML applies the image to a View:

<ImageView
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:src="@drawable/myimage" />

The following application code retrieves the image as a

Drawable

:

Resources res = [code]getResources()

;
Drawable drawable = res.

getDrawable

(R.drawable.myimage);[/code]