Question

我想检查哪个图像资源附加到xml中的ImageView，我能够检查哪个图像资源附加到图像视图但我的要求是如何检查ImageView我有没有设置成xml的相同资源，基于我需要执行一些actions.Code总是执行else部分。以下是我的代码，

  if (regProfile.getDrawable() == getResources().getDrawable( R.drawable.ivpic)) 
    {
      Toast.makeText(_con, "Image is ivPic", Toast.LENGTH_LONG).show(); 
      // new RegisterAsyntaskNew().execute(); 
    } 
  else 
    {
     Toast.makeText(_con, "Image isn't ivPic", Toast.LENGTH_LONG).show(); 
     // new RegisterAsyntask().execute(); 
    }

Answer 1

您好请尝试以下

if (regProfile.getDrawable().getConstantState() == getResources().getDrawable( R.drawable.ivpic).getConstantState()) 
{
  Toast.makeText(_con, "Image is ivPic", Toast.LENGTH_LONG).show(); 
  // new RegisterAsyntaskNew().execute(); 
} 
else 
{
 Toast.makeText(_con, "Image isn't ivPic", Toast.LENGTH_LONG).show(); 
 // new RegisterAsyntask().execute(); 
}

请使用.getConstantState()进行比较

访问

http://developer.android.com/reference/android/graphics/drawable/Drawable.html

http://developer.android.com/reference/android/graphics/drawable/Drawable.ConstantState.html

修改

.getResources().getDrawable(imageResource)

在API21中已弃用，因此我更改了Jitesh Upadhyay的答案。

以下是代码：

@SuppressWarnings("deprecation") @SuppressLint("NewApi") public static boolean checkImageResource(Context ctx, ImageView imageView, int imageResource) { boolean result = false; if (ctx != null && imageView != null && imageView.getDrawable() != null) { ConstantState constantState; if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { constantState = ctx.getResources() .getDrawable(imageResource, ctx.getTheme()) .getConstantState(); } else { constantState = ctx.getResources().getDrawable(imageResource) .getConstantState(); } if (imageView.getDrawable().getConstantState() == constantState) { result = true; } } return result; }

Answer 2

您可以执行以下操作，

根据您的要求，通过xml或动态设置tag。

通过xml，

<ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/imageview1" 
        android:background="@drawable/bg"
        android:tag="bg"/>

动态，

ImageView imageView=(ImageView)findViewById(R.id.imageview1);
imageView.setTag("bg");

使用imageView.getTag()检索图像信息。

String backgroundImageName = String.valueOf(imageView.getTag());

编辑：

如果您经常更改ImageView背景，

imageView.setTag(R.drawable.drawablename);
imageView.setImageResource(R.drawable.drawablename);
String backgroundImageName = String.valueOf(imageView.getTag());

现在你可以进行检查了。

if (backgroundImageName.equals("bg"))  // here "bg" is the tag that you set previously
    {
      Toast.makeText(_con, "Image is ivPic", Toast.LENGTH_LONG).show(); 
      // new RegisterAsyntaskNew().execute(); 
    } 
  else 
    {
     Toast.makeText(_con, "Image isn't ivPic", Toast.LENGTH_LONG).show(); 
     // new RegisterAsyntask().execute(); 
    }

Answer 3

我已经在这里回答了类似的话题：Get the ID of a drawable in ImageView。该方法基于在自定义LayoutInflater中使用指定的资源ID标记视图。整个过程由一个简单的库TagView自动完成。

因此，您可以仅通过ID来比较两个drawable：

TagViewUtils.getTag(regProfile, ViewTag.IMAGEVIEW_SRC.id) == R.drawable.ivpic

Answer 4

我面临同样的问题，但我在kotlin Android中解决了

override fun onClick(v: View?) {

    when (v!!.getId()) {

        R.id.exo_fullscreen_button -> {
            if (exo_fullscreen_icon.drawable.constantState == resources.getDrawable( R.drawable.exo_controls_fullscreen_enter).constantState) {
                Toast.makeText(activity, "Correct Image ", Toast.LENGTH_LONG).show();

            }else{
                Toast.makeText(activity, "wrong image", Toast.LENGTH_LONG).show();

            }
        }
    }

}

Answer 5

你可以这样做。首先你需要像这样设置imageview的tag属性

 android:tag="ic_grade_grey_24dp"

if (viewHolder.imgfav.getTag().equals("ic_grade_grey_24dp"))  // here "bg" is the tag that you set previously
            {
                Toast.makeText(mContext, "ic_grade_black_24dp", Toast.LENGTH_LONG).show();
                // new RegisterAsyntaskNew().execute();
                viewHolder.imgfav.setImageResource(R.drawable.ic_grade_black_24dp);
                viewHolder.imgfav.setTag("ic_grade_black_24dp");
            }
            else
            {
                Toast.makeText(mContext, "Second", Toast.LENGTH_LONG).show();
                viewHolder.imgfav.setImageResource(R.drawable.ic_grade_grey_24dp);
                viewHolder.imgfav.setTag("ic_grade_grey_24dp");
            }

Answer 6

科特林中的相同解决方案：

if (regProfile.drawable.constantState == ContextCompat.getDrawable(this, R.drawable.ivpic).constantState) 
   { 
       Toast.makeText(_con, "Image is ivPic", Toast.LENGTH_LONG).show(); 
       // new RegisterAsyntaskNew().execute(); 
   } 
else 
   {
       Toast.makeText(_con, "Image isn't ivPic", Toast.LENGTH_LONG).show(); 
       // new RegisterAsyntask().execute(); 
   }

如何检查哪些当前图像资源附加到android xml中的ImageView？

6 个答案: