Android:为RelativeLayout设置背景图片?

时间:2011-02-05 10:50:00

标签: android android-layout android-relativelayout

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?

4 个答案:

答案 0 :(得分:22)

查看Drawable类中的setBackgroundDrawablecreateFromPath

   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);

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