Activity生命周期监测接口-Application的ActivityLifecycleCallbacks接口

最新推荐文章于 2024-08-08 08:42:25 发布

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最新推荐文章于 2024-08-08 08:42:25 发布

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分类专栏： Android基础知识

本文链接：https://blog.youkuaiyun.com/zhangxmu/article/details/53585586

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本文介绍了一种使用Application的registerActivityLifecycleCallbacks方法来管理Android Activity生命周期的方法，并通过实例展示了如何记录Activity的各个生命周期回调。

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之前学习Activity的生命周期时,想打印出Activity的生命周期进行观察,我是这样做的...

 @Override
    protected void onResume() {
        super.onResume();
        Log.v(TAG,"onResume--");
    }

一直以为就只有这样才能看到生命周期...

后来发现,Application有一个registerActivityLifecycleCallbacks()方法可以ActivityLifecycleCallbacks接口来管理Activity生命周期,方便简洁.

新建一个BaseApplication集成Application:

public class BaseApplication extends Application {

在AndroidManifest.xml的application中添加:

<application
        android:name=".BaseApplication"

实现它的onCreate()方法:

 @Override
    public void onCreate() {
        super.onCreate();
    }

在onCreate()中调用它的registerActivityLifecycleCallbacks()方法:

public class BaseApplication extends Application {

    @Override
    public void onCreate() {
        super.onCreate();
        this.registerActivityLifecycleCallbacks(new ActivityLifecycleCallbacks() {
            @Override
            public void onActivityCreated(Activity activity, Bundle bundle) {
                Log.v(activity.toString(),"onActivityCreated--");
            }

            @Override
            public void onActivityStarted(Activity activity) {
                Log.v(activity.toString(),"onActivityStarted--");
            }

            @Override
            public void onActivityResumed(Activity activity) {
                Log.v(activity.toString(),"onActivityResumed--");
            }

            @Override
            public void onActivityPaused(Activity activity) {
                Log.v(activity.toString(),"onActivityPaused--");
            }

            @Override
            public void onActivityStopped(Activity activity) {
                Log.v(activity.toString(),"onActivityStopped--");
            }

            @Override
            public void onActivitySaveInstanceState(Activity activity, Bundle bundle) {
                Log.v(activity.toString(),"onActivitySaveInstanceState--");
            }

            @Override
            public void onActivityDestroyed(Activity activity) {
                Log.v(activity.toString(),"onActivityDestroyed--");
            }
        });
    }
}

在MainActivity中写上原始打印方法:

public class MainActivity extends AppCompatActivity {

    private static final String TAG="MainActivity";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    @Override
    protected void onResume() {
        super.onResume();
        Log.v(TAG,"onResume--");
    }

}

运行Demo,在控制台打印出:

点返回键,退出APP: