Tint EditText drawableStart if Build.VERSION.SDK_INT <= Build.VERSION_CODES.M (API 23).

app/src/main/java/chat/rocket/android/app/AuthenticationSignUpFragment.kt

 package chat.rocket.android.app
 
 import android.app.Fragment
+import android.os.Build
 import android.os.Bundle
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
 import android.view.WindowManager
 import chat.rocket.android.R
+import chat.rocket.android.widget.helper.DrawableHelper
+import kotlinx.android.synthetic.main.fragment_authentication_sign_up.*
 
 /**
  * @author Filipe de Lima Brito (filipedelimabrito@gmail.com)
@@ -19,5 +22,23 @@ class AuthenticationSignUpFragment : Fragment() {
         super.onViewCreated(view, savedInstanceState)
 
         activity.window.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_VISIBLE)
+
+        if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.M) {
+            tintEditTextDrawableStart()
+        }
+    }
+
+    private fun tintEditTextDrawableStart() {
+        val context = activity.applicationContext
+
+        val personDrawable = DrawableHelper.getDrawableFromId(R.drawable.ic_person_black_24dp, context)
+        val atDrawable = DrawableHelper.getDrawableFromId(R.drawable.ic_at_black_24dp, context)
+        val lockDrawable = DrawableHelper.getDrawableFromId(R.drawable.ic_lock_black_24dp, context)
+        val emailDrawable = DrawableHelper.getDrawableFromId(R.drawable.ic_email_black_24dp, context)
+
+        val drawables = arrayOf(personDrawable, atDrawable, lockDrawable, emailDrawable)
+        DrawableHelper.wrapDrawables(drawables)
+        DrawableHelper.tintDrawables(drawables, context, R.color.colorDrawableTintGrey)
+        DrawableHelper.compoundDrawables(arrayOf(text_name, text_username, text_password, text_email), drawables)
     }
 }
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