Android dataBinding - ignored user namespace @BindingAdapter

Question

I created a custom bindAdapter in android, and when I pass the color, I want the color to change, this is actually for the im test, which works just to make sure it works. Here is the code: here is my view. Model for data binding:

public class User { public ObservableInt visible; public User(int visible) { this.visible=new ObservableInt(visible); } @BindingAdapter({"app:bindColor"}) //notice the bindColor custom attribute public static void setTextColor(TextView view,String color) { if("green".equals(color)) view.setTextColor(Color.parseColor("#63f421")); } 

}

Now in my XML file that is bound to this model, I expect it to go in color so that the setTextColor method can use it:

  <?xml version="1.0" encoding="utf-8"?> <layout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto"> <data class="MainActivityBinder"> <variable name="user" type="com.example.android.floatingactionbuttonbasic.User"/> </data> <LinearLayout android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/tv_one" android:text="my first textview"/> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/tv_two" android:text="my second textview" android:visibility="@{user.visible}" app:bindColor="@{'green'}" //see im passing in the green string here android:textColor="@android:color/holo_green_dark"/> </LinearLayout> </layout> 

I get a runtime error:

 Error:(27, 65) error: package com.example.android.floatingactionbuttonbasic.databinding does not exist Warning:Application namespace for attribute app:bindColor will be ignored. Error:(24, 33) Identifiers must have user defined types from the XML file. een is missing it Error:Execution failed for task ':Application:compileDebugJavaWithJavac'. > java.lang.RuntimeException: Found data binding errors. 

if I pulled out material bindingAdapter, it works fine with other material for data binding. Its just this user binding does not work. My project is called floactionbuttonbasic.

Answer 1

I was able to get this to work. The problem was how I went in line. He must have "around."

 app:bindColor="@{`green`}" 

You can also do this:

 app:bindColor='@{"green"}' 

But what seems unacceptable is the notation:

 app:bindColor="@{'green'}" 

I wrote a blog about this to help others if they are interested.