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四大组件之Activity详解

一、Activity的概要说明

     我看过Activity的源码,Activity类注释大概是这样解释的:几乎所有的Activity都是与用户交互用的,我想用了一个几乎的意思应该是排除一些纯展示界面吧,因此Activity类主要是创建一个窗口来展示我们所做的UI界面,我们用的时候通常是全屏来展示UI界面的,但是Activity也有一些其他的用途,比如当做一个悬浮的视窗来用(在清单文件里更改Activity的主)。

二、Activity的四种LaunchMode

     设置:<activity android:name=".MainActivity" android:launchMode="standard" />

     1、Standard:把Activity设置成Standard启动模式的意思是:比如当前显示的界面是FirstActivity,此时任务栈里就会有一个FirstActivity实例,接下来由FirstActivity跳转到FirstActivity,此时任务栈里就会生成一个新的FirstActivity实例,如果再次跳转到FirstActivity,任务栈里又会多出第二个FirstActivity实例,到现在为止任务栈里一共有三个FirstActivity实例,这时候我们连着按两次Back键,才会返回到第一个FirstActivity,如下图所示:

     四大组件之Activity详解images/loading.gif' 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

     2、SingleTop:比如当前界面显示的界面是FirstActivity,此时任务栈里就会有一个FirstActivity实例,接下来由FirstActivity跳转到FirstActivity,这个时候系统发现在栈顶处已经存在一个FirstActivity实例了,所以就不会再新建FirstActivity实例了(如第一个图),否则就会在栈顶新建它的实例(如第二个图),从SecondActivity跳转到FirstActivity的时候,发现虽然任务栈里存在FirstActivity实例,但是位置不在栈顶,所有就新建了一个FirstActivity实例。

    四大组件之Activity详解     四大组件之Activity详解

    四大组件之Activity详解

     4、singleInstance:这种启动模式的特别之处在于会启动一个新栈,一个栈存放一类(类别)的实例,就好比动物园里,好多只老虎有自己的园子,好多只猴子又有自己的园子,这里的老虎猴子就是不同的Activity,每一只老虎猴子就是个自Activity的实例。

         比如说我们当前显示的界面是FirstActivity,此时栈里就会有一个FirstActivivity实例,接下来由FirstActivity跳转到SecondActivity,这个时候就会出现一个新栈来存放SecondActivity实例的,按一下Back键又回到了第一个栈里(如下边第一个图)。假如我们从FirstActivity跳转到SecondActivity,又从SecondActivity跳转到FirstActivity,这个时候在FirstActivity所在的栈里又会创建一个新的FirstActivity实例放在栈顶,接下来我们按两次Back键,并没有退出程序,而是回到了SecondActivity(如下边第二个图)。

四大组件之Activity详解

 

四大组件之Activity详解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**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
说明:
四大组件之Activity详解         四大组件之Activity详解        四大组件之Activity详解
     3、
 
四、Activity类里容易被忽略的方法
     (一)onNewIntent(Intent intent)
         Activity的启动模式为singleTop/singleTask会执行onNewIntent方法,比如从OneActivity(SingTask模式)跳转到TwoActivity,再从TwoActivity回来,OneActivity的生命周期就会变成onNewIntent()---->onResart()------>onStart()----->onResume(),也就是说只要OneActivity在任务栈里,并且又不是第一次进入到OneActivity,就会执行onNewIntent()方法。那么
   (二)onSaveInstanceState(Bundle outState)
          在网上查过很多人资料,说这个方法只有在系统内存不够时,Activity被强制杀死的时候才会被执行,但是这种说法是错误,我试了几种情况,也会执行  
    onSaveInstanceState方法。
          1、Activity正常的跳转
         四大组件之Activity详解
           2、按Home键退到后台的时候
        四大组件之Activity详解
           3、横竖屏切换的时候,比如我们在看电影的时候,横竖屏切换的时候,必须保存切换之前看的进度。
        四大组件之Activity详解

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