# AndroidLayer isSecure
![AndroidLayer isSecure](
Android operating system provides various layers to ensure security at different levels. One such important layer is the **isSecure** layer. In th
# Android Surface Layer
## Introduction
The Android Surface Layer is a fundamental component of the Android operating system that provides a high-level interface for managing and rendering graphical
largeHeap介绍一个应用如果使用了largeHeap，会请求系统为Dalvik虚拟机分配更大的内存空间。使用起来也很方便，只需在manifest文件application节点加入android:largeHeap=“true”即可。<application android:icon="@drawable/icon"
android:allowBackup="false"
and
一、View的种类View主要分成两种：一种是单一视图，只包含一个view,常见的有textview等。另一种是视图组，包含一组view，也就是viewgroup。可以看到viewgroup继承自view，比如Linearlayout等布局、listview。public abstract class ViewGroup extends View implements ViewParent, Vi
