Android Development Engineer Anthology-1 hours to learn various drawable

Objective

Hello everyone, to bring you Android开发工程师文集-1 小时学会各种Drawable an overview, I hope you like

drawable Introduction

Drawable is an abstract class, where drawable differs from view in that it embodies events and interactivity.

View is a user-oriented, visible control that can add a click event to it. Drawable on the contrary, cannot be oriented, nor visible, nor can you add click events.

Drawable have a lot of subclasses, drawable are abstract classes, so there are many subclasses to inherit it.

Main principles and methods

• Draw ()
• SetBounds ()

Bitmapdrawable Batme drawable

The subclass is a bitmap wrapper that preserves the original picture size, padding, and stretching.

<bitmap xmlns:android="http://schemas.android.com/apk/res/android" android:src="@drawable/ic_launcher" android:tileMode="mirror"//平铺 android:antialias="true"//消除锯齿 android:dither="true"></bitmap>

Layerdrawable Le drawable

This subclass is to manage a set of drawable, the first picture of the placement, then the second picture will be on the first picture, and then placed in turn.

<?xml version="1.0" encoding="utf-8"?><layer-list xmlns:android="http://schemas.android.com/apk/res/android"> <item android:top="40dp" android:left="40dp" android:src="@drawable/picture_1" android:gravity="center"> </item> <item android:top="40dp" android:left="40dp" android:src="@drawable/picture_2" android:gravity="center"> </item></layer-list>

Statelistdrawable

This class of statelistdrawable provides different images depending on the state.

<?xml version="1.0" encoding="utr-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android"> <item android:state_focused="true" android:drawable="@drawable/botton_1"/> <item android:state_pressed="true" android:drawable="@drawable/botton_2"/> <item android:state_selected="true" android="@drawable/botton_3"/> <item android:drawable="@drawable/botton_4"/></selector>

Levellistdrawable

The subclass has different item-setlevel ();

<level-list xmlns:android="http://schemas.android.om/apk/res/android"> <item  android:drawable="@drawable/off"  android:minLevel="5"  android:maxLevel="10"> </item> <item  android:drawable="@drawable/on"  android:minLevel="10"  android:maxLevel="20"> </item></level-list>

public void On(View v){ iv.setImageLevel( //int );}

transitiondrawable---transi tion drawable

For Layerdrawable subclasses, only two picture changes, no multiple pictures, layerdrawable can have multiple item, and transitiondrawable only has two item.

<transition xmlns:android="http://schemas.android.com/apk/res/android"> <item android:drawable="@drawable/off"> </item> <item android:drawable="@drawable/on"> </item></transition>

public void On(View v){ TransitionDrawable drawable=iv.getDrawable(); //开启 startTransition(); drawable.startTransition(2000);}public void Off(View v){ TranstionDrawable drawable=iv.getDrawable(); //关闭 reverseTransition(); drawable.reverseTransition(2000);}

Insertdrawable

Insertdrawable represents an embedded picture ==padding

<inset  xmlns:android="http://schemas.android.com/apk/res/android" android:drawable="@drawable/background" android:insetLeft="50dp" android:insetRight="50dp" android:insetTop="50dp" android:insetBottom="50dp"></inset>

Clipdrawable can be tired drawable

The Clipdrawabel is a form of clipping, like a progress bar.

<clip xmlns:android="http://schemas.android.com/apk/res/android" android:drawable="@drawable/picture" android:clipOrientation="horizontal" android:gravity="left"/>

ClipDrawable drawable=iv.getDrawable();drawable.setLevel(5000);//范围0-10000；

DIY drawable

Try it yourself.
Comb:
Bitmapdrawable,
Layerdrawable,
Statelistdreawable,
Levellistdrawable,
Transitiondrawable,
Insertdrawable,
Clipdrawable.

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Android Development Engineer Anthology-1 hours to learn various drawable