Android LifecycleObserver

package zhangphil.test;import android.arch.lifecycle.Lifecycle;import android.arch.lifecycle.LifecycleObserver;import android.arch.lifecycle.LifecycleRegistry;import android.arch.lifecycle.OnLifecycleEvent;import android.os.Bundle;import android.support.annotation.Nullable;import android.support.v7.app.AppCompatActivity;public class LiveActivity extends AppCompatActivity {    private LifecycleRegistry mLifecycleRegistry = new LifecycleRegistry(this);    @Override    protected void onCreate(@Nullable Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        System.out.println("onCreate");        MyLifecycle mLifecycle = new MyLifecycle();        getLifecycle().addObserver(mLifecycle);    }    @Override    protected void onResume() {        super.onResume();        System.out.println("onResume");    }    @Override    protected void onPause() {        super.onPause();        System.out.println("onPause");    }    @Override    public LifecycleRegistry getLifecycle() {        return mLifecycleRegistry;    }    public class MyLifecycle implements LifecycleObserver {        @OnLifecycleEvent(Lifecycle.Event.ON_CREATE)        public void on_create() {            System.out.println("Lifecycle.Event.ON_CREATE");        }        @OnLifecycleEvent(Lifecycle.Event.ON_RESUME)        public void on_resume() {            System.out.println("Lifecycle.Event.ON_RESUME");        }        @OnLifecycleEvent(Lifecycle.Event.ON_PAUSE)        public void on_pause() {            System.out.println("Lifecycle.Event.ON_PAUSE");        }    }}

logcat outputs：

2018-11-12 16:32:09.058 32233-32233/zhangphil.test I/System.out: onCreate2018-11-12 16:32:09.062 32233-32233/zhangphil.test I/System.out: Lifecycle.Event.ON_CREATE2018-11-12 16:32:09.203 32233-32233/zhangphil.test I/System.out: onResume2018-11-12 16:32:09.204 32233-32233/zhangphil.test I/System.out: Lifecycle.Event.ON_RESUME2018-11-12 16:32:12.254 32233-32233/zhangphil.test I/System.out: Lifecycle.Event.ON_PAUSE2018-11-12 16:32:12.254 32233-32233/zhangphil.test I/System.out: onPause2018-11-12 16:32:13.556 32233-32233/zhangphil.test I/System.out: onResume2018-11-12 16:32:13.557 32233-32233/zhangphil.test I/System.out: Lifecycle.Event.ON_RESUME

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