SASS - extend 

style.scss


.messageDesign{
  padding: 10px;
  width: 150px;
  text-align: center;
  color: #444;
}

.error{
  border: 1px solid red;
  @extend .messageDesign;
}
.warning{
  border: 1px solid yellow;
  @extend .messageDesign;
}
.success{
  border:1px solid green;
  @extend .messageDesign;
}




or make a placeholder(%) messageDesign




WE USE PLACEHOLDER IF YOU DO NOT NEED TO HAVE ARGUMENT LIKE;


messageDesign(param1,param2)




%messageDesign{
  padding: 10px;
  width: 150px;
  text-align: center;
  color: #444;
}

.error{
  border: 1px solid red;
  @extend %messageDesign;
}
.warning{
  border: 1px solid yellow;
  @extend %messageDesign;
}
.success{
  border:1px solid green;
  @extend %messageDesign;
}

































































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About Android padding, margin, width, height, wrap_content, match_parent, R Class





















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@SerializedName and @Expose annotations





















 The  @SerializedName  annotation is needed for Gson to map the JSON keys with our fields. In keeping with Java's camelCase naming convention for class member properties, it is not recommended to use underscores to separate words in a variable.  @SerializedName  helps translate between the two.    @SerializedName ( "quota_remaining" )  @Expose   private  Integer quotaRemaining;    In the example above, we are telling Gson that our JSON key  quota_remaining  should be mapped to the Java field  quotaRemaining .  If both of these values were the same, i.e. if our JSON key was  quotaRemaining  just like the Java field, then there would be no need for the  @SerializedName  annotation on the field because Gson would map them automatically.   The  @Expose  annotation indicates that this member should be exposed for JSON serialization or deserialization.   








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