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Why do you want to set android:background=@null? You can fill @null or [] or better @''. So to avoid creating a string i set it to null.

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Attribute textcursordrawable is available in api level. I'm a bit lost why i need to set a string. Instead of @coalesce you can use ?

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Muitas pessoas falam sobre o que é null, mas afinal, qual é o seu verdadeiro significado? If you don't want to apply background then no need to add this property, i think so. I found the following attribute in one xml layout: Like @dataset()?.filename if empty return null.

Setting the android:textcursordrawable attribute to @null should result in the use of android:textcolor as the cursor color. I do not understand what is point of addin. For example, some view s will set their own backgrounds if they get a null value from the xml. I was checking list of available constraints in javax.validation package and i noticed that there is an annotation @null which force the field to be null.

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Android:contentdescription=@null this seems to quiet down the complaints from lint.

Android:background=@null what is the meaning of @null? @empty basically means null, and leave it null instead of using default value. What is the difference between specifying background=@null and. I can see that @nullable and @nonnull annotations could be helpful in preventing nullpointerexceptions but they do not propagate very far.

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