// 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）