介绍 A toast provides simple feedback about an operation in a small popup. It only fills the amount of space required for the message and the current activity remains visible and interactive. For example, navigating away from an email before you send i…
介绍 The AlertDialog class allows you to build a variety of dialog designs and is often the only dialog class you'll need. there are three regions of an alert dialog: 1.Title This is optional and should be used only when the content area is occupied by…
介绍 A StateListDrawable is a drawable object defined in XML that uses a several different images to represent the same graphic, depending on the state of the object. For example, a Button widget can exist in one of several different states (pressed, f…
介绍 Layout which wraps an {@link android.widget.EditText} (or descendant) to show a floating label when the hint is hidden due to the user inputting text. Also supports showing an error via {@link #setErrorEnabled(boolean)} and {@link #setError(CharSe…
介绍 Source Code中的介绍如下: Floating action buttons are used for a special type of promoted action. They are distinguished by a circled icon floating above the UI and have special motion behaviors related to morphing, launching, and the transferring anchor…