Android 加载asset文件夹下边的图片

// load image 
    try { 
      // get input stream 
      InputStream ims = getAssets().open("avatar.jpg"); 
      // load image as Drawable 
      Drawable d = Drawable.createFromStream(ims, null); 
      // set image to ImageView 
      mImage.setImageDrawable(d); 
    } 
    catch(IOException ex) { 
      return; 
    }

Bitmap bitmap;
    try { 
      InputStream ims = this.getContext().getAssets().open("fl.jpg"); 
      // 读入图片并将其强转为 BitmapDrawable类型
      BitmapDrawable bd = (BitmapDrawable) Drawable.createFromStream(ims, null);
      bitmap = bd.getBitmap();
      ims.close();
    } 
    catch(IOException ex) { 
      return; 
    } 
    //canvas.drawBitmap(bitmap, -200, -200, new Paint());
    canvas.drawBitmap(bitmap, null, new Rect(-30,-40,30,40), new Paint());//null表示原图尺寸，第二个rect表示显示区域（位图会拉伸填充该区域）