How I can implement a warning in a text field like this in android:
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Simply use TextView.setError method.
This will display error message as shown in the image with default error icon. You can even change the icon using the second variant of the setError method.
To clear the error simply pass null as the method argument.
for more details check:
http://developer.android.com/reference/android/widget/TextView.html#setError(java.lang.CharSequence)