Android(安卓)LifecycleObserver
16lz
2021-12-04
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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