⽣命周期观察者LifecycleObrver
转载请注明出处:Write By xyx In cdsn @包罗万码
原⽂地址:
杂音为了⽅便Activity的代码优化,Android推出了⽣命周期观察者，复杂活简单说,
先看代码：这是⼀个声明周期的观察者类;
学习交谊舞
public class MyObrver implements LifecycleObrver {
@OnLifecycleEvent(Lifecycle.Event.ON_START)
public void ready(){
Log.e("--LifecycleObrver","ON_START");
}
@OnLifecycleEvent(Lifecycle.Event.ON_RESUME)
public void connectListener() {
Log.e("--LifecycleObrver","ON_RESUME");
}
@OnLifecycleEvent(Lifecycle.Event.ON_PAUSE)
四六级考试流程public void disconnectListener() {
Log.e("--LifecycleObrver","ON_PAUSE");电子工艺实训
}
}
在你的Activity中调⽤下⾯这句话
getLifecycle().addObrver(new MyObrver());
啥个意思：就是把Activity中⽣命周期的⽅法延伸给另外⼀个类, 让另外⼀个类去处理⽣命周期的⽅法，缩⼩了Activity的代码量
Activity只负责绘制UI部分的代码
Activity部分你也可以这么写让它实现:LifecycleOwner澳大利亚买房
如果您要创建⾃定义类，则 LifecycleOwner可以使⽤ LifecycleRegistry 类，但需要将事件转发到该类，如以下代码⽰例所⽰：
说了那么多没看懂,LifecycleOwner啥个意思，既然他LifecycleObrver 是⼀个观察者，那么就可以⽤来注册观察者,LifecycleOwner通过LifecycleRegistry ⽤来控制LifecycleObrver,爱戴的意思
Activity中注释这个代码//getLifecycle().addObrver(new MyObrver());
public class WelcomeActivity extends AppCompatActivity implements LifecycleOwner {
//...
LifecycleRegistry lifecycleRegistry;
private MyObrver myObrver;
@Override
protected void onCreate(Bundle savedInstanceState) {
闽剧甘国宝tContentView(R.layout.activity_welcome);
//...
lifecycleRegistry = new LifecycleRegistry(this);
myObrver = new MyObrver();
lifecycleRegistry.addObrver(myObrver);
lifecycleRegistry.markState(Lifecycle.State.CREATED);
//...
}
@Override
protected void onStart() {
myObrver.disconnectListener();//通知者的断开连接，会直接跳到Activity的onPau⽅法()
}
@Override
protected void onPau() {
Log.e("--", "Activity---onPau: " );
lifecycleRegistry.markState(Lifecycle.State.STARTED);//进⼊了Activity的StartED状态夜的邂逅
}
@Override
public Lifecycle getLifecycle() {
return lifecycleRegistry;
}
}
Lifecycle.State 跟 Lifecycle.Event今晚暂不更新解说
2018-10-14 22:59:28.315 21461-21461 /... E/--LifecycleObrver: ON_PAUSE 2018-10-14 22:59:28.316 21461-21461/....E/--LifecycleObrver: ON_START 2018-10-14 22:59:28.317 21461-21461/.... E/--LifecycleObrver: ON_RESUME 2018-10-14 22:59:28.343 21461-21461/.... E/--LifecycleObrver: ON_PAUSE 2018-10-14 22:59:28.343 21461-21461/..... E/--: Activity---onPau:
看到log⾥边，会直接进⼊Activity的onPau状态:
这个LifecycleOwner使得Activity的⽣命周期变成了可随意调整的状态模式
