java - 如何检查 ImageView 中是否有图像并跳过该图像到下一个 ImageView

Question

有点像刽子手

如果 ImageView 中有东西，如何跳过 ImageView 并检查其中是否有东西尝试检查 imageView 中是否有图像

代码

     final boolean imageThere = mImageView17.setBackgroundResource(null);
      public void image6(){
      randomNumber();
      final int thisLetter = currentLetter;
      final boolean imageThere = mImageView17.setBackgroundResource(null);

      mImageView6 = (ImageView) findViewById(R.id.imageView6);
      mImageView6.setImageResource(thisLetter);       
      mImageView6.bringToFront();

     mImageView17 = (ImageView)findViewById(R.id.imageView17);
      mImageView6.setOnClickListener(new OnClickListener() {

        public void onClick(View v) {
            // TODO Auto-generated method stub
            if (imageThere == false) {
            mImageView17.setImageResource(thisLetter);
            mImageView17.bringToFront();
            mImageView6.setImageResource(R.drawable.whitespace);
            } else {
                mImageView18.setImageResource(thisLetter);
                mImageView18.bringToFront();
                mImageView6.setImageResource(R.drawable.whitespace);    

            }

            }



  });

     mImageView17.setOnClickListener(new OnClickListener() {
          public void onClick(View v) {
            // TODO Auto-generated method stub
            mImageView6.setImageResource(thisLetter);
            mImageView6.bringToFront();
            mImageView17.setImageResource(R.drawable.whitespace);


        }
  });
  }

基本上我想检查ImageView以查看imageview 17中的图像是否存在，如果存在，则跳过17并将imageresource 6添加到imageview18

我还想确保，如果我对另一个 imageview17 执行此操作，当我单击 ImageView 17 时，将相同的代码添加到 imageview 6 of 7 或 8 时，不会出现困惑

我该如何解决这个问题？

Answer 1

if (mImageView17.getDrawable() != null) {
  // I already have a bitmap

}

getDrawable 的文档说:

Return the view's drawable, or null if no drawable has been assigned.