android读取assets下的资源

<strong><span style="font-size:18px;">先封装方法</span></strong>

public class OperateAssets {
  
  private static OperateAssets operateAssets;
  public static OperateAssets getInstance(){
    if(operateAssets == null){
      operateAssets = new OperateAssets();
    }
    return operateAssets;
  }
  
  /*
   * 获取Assets文件夹下的图片资源
   */
  public Bitmap getImageFromAssetsFile(Context context, String path) {
    Bitmap bitmap = null;
    AssetManager assetManger = context.getResources().getAssets();
    try {
      InputStream inputStream = assetManger.open(path);
      bitmap = BitmapFactory.decodeStream(inputStream);
      inputStream.close();
    } catch (IOException e) { 
      e.printStackTrace();
    }
    return bitmap; 
  }
  
  /*
   * 将bitmap转成Drawable
   */
  public Drawable convertBitmapToDrawable(Bitmap bitmap,Resources res){
      return new BitmapDrawable(res, bitmap); 
  } 
}

然后把资源载入布局

Bitmap bitmap = OperateAssets.getInstance().getImageFromAssetsFile(getActivity(), "themediy/skin_chat_background.png");
    RelativeLayout relativeLayout = (RelativeLayout)view.findViewById(R.id.message_bg);
    relativeLayout.setBackgroundDrawable(OperateAssets.getInstance().convertBitmapToDrawable(bitmap, getResources()));

我这里用的是fragment

对相对布局设置背景