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

Question

我想检查ImageView在xml中附加了哪个图像资源,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它是否ImageView具有我设置为xml的相同资源,基于我需要执行一些actions.Code总是执行其他部分.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

嗨请试试这个如下

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.getConstantState()用来比较

访问

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

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

编辑:

.getResources().getDrawable(imageResource)

在API21中被弃用,所以我更改了Jitesh Upadhyay的答案.

这是代码:

@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

你可以做以下事情,

tag根据您的要求,通过xml或动态设置.

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:

如果你ImageView经常改变背景,那么,

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

kotlin 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(); 
   }