我在运行时下载了一张图片。现在我想将其设置为RelativeLayout
的背景。有可能吗?
答案 0 :(得分:22)
查看Drawable类中的setBackgroundDrawable或createFromPath。
RelativeLayout rLayout = (RelativeLayout) findViewById (R.id.rLayout);
Resources res = getResources(); //resource handle
Drawable drawable = res.getDrawable(R.drawable.newImage); //new Image that was added to the res folder
rLayout.setBackground(drawable);
答案 1 :(得分:4)
改为使用:
View lay = (View) findViewById(R.id.rLayout);
lay.setBackgroundResource(R.drawable.newImage);
这是有效的,因为R.drawable.newImage
指的是一个整数。所以你可以这样做:
int pic = R.drawable.newImage;
lay.setBackgroundResource(pic);
答案 2 :(得分:2)
尝试使用Xamarin.Android(跨平台) -
RelativeLayout relativeLayout = new RelativeLayout (this);
OR
RelativeLayout relativeLayout = (RelativeLayout)FindViewById (Resource.Id.relativeLayout);
和
relativeLayout.SetBackgroundDrawable (Resources.GetDrawable (Resource.Drawable.imageName));
答案 3 :(得分:0)
在onCreate函数中:
RelativeLayout baseLayout = (RelativeLayout) this.findViewById(R.id.the_layout_id);
Drawable drawable = loadImageFromAsset();
if(drawable != null){
baseLayout.setBackground(drawable);
Log.d("TheActivity", "Setting the background");
}
图片加载方式:
public Drawable loadImageFromAsset() {
Drawable drawable;
// load image
try {
// get input stream
InputStream ims = getAssets().open("images/test.9.png");
//Note: Images can be in hierarical
// load image as Drawable
drawable = Drawable.createFromStream(ims, null);
}
catch(IOException ex) {
Log.d("LoadingImage", "Error reading the image");
return null;
}
return drawable;
}
开放式方法:
> public final InputStream open (String fileName, int accessMode)
>
> Added in API level 1 Open an asset using an explicit access mode,
> returning an InputStream to read its contents. This provides access to
> files that have been bundled with an application as assets -- that is,
> files placed in to the "assets" directory.
>
> fileName --- The name of the asset to open. This name can be hierarchical.
>
> accessMode --- Desired access mode for retrieving the data.
>
> Throws IOException