Android中ActivityLifecycleCallbacks监听Activity们的生命周期

如果你还在Activity的声明周期函数（onCreate、onStart）打印log来看activity的声明周期，那么你就out了！

今天楼主叫你用ActivityLifecycleCallbacks来监听activity们的声明周期。

接下来上代码：

AndroidManifest.xml：

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.example.lxxcaroline.applicationtest">    <application        android:name="com.example.lxxcaroline.test.MyApplication"        android:allowBackup="true"        android:icon="@drawable/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme">        <activity            android:name=".MainActivity"            android:label="@string/app_name">            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>        <activity            android:name=".SecondActivity"            android:label="secondActivity">        </activity>    </application></manifest>

MainActivity.java：

package com.example.lxxcaroline.applicationtest;import android.content.Intent;import android.os.Bundle;import android.support.v7.app.ActionBarActivity;import android.util.Log;import android.view.View;import android.widget.Button;public class MainActivity extends ActionBarActivity {    private static final String TAG="ApplicationTest";    private Button button;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        Log.d(TAG,"MainActivity is created successfully.");        button=(Button)findViewById(R.id.btn);        button.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                Intent intent=new Intent(MainActivity.this,SecondActivity.class);                startActivity(intent);            }        });    }}

SecondActivity.java：

package com.example.lxxcaroline.applicationtest;import android.app.Activity;import android.os.Bundle;/** * Created by LxxCaroline on 2015/5/4. */public class SecondActivity extends Activity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.layout);    }}

activity_main.xml：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    android:paddingBottom="@dimen/activity_vertical_margin"    tools:context=".MainActivity">   <Button       android:id="@+id/btn"       android:layout_width="wrap_content"       android:layout_height="wrap_content"       android:text="button"/></RelativeLayout>

layout.xml：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    android:paddingBottom="@dimen/activity_vertical_margin"    tools:context=".MainActivity">    <TextView        android:text="@string/hello_world"        android:layout_width="wrap_content"        android:layout_height="wrap_content" /></RelativeLayout>

MyApplication.java：

package com.example.lxxcaroline.test;import android.app.Activity;import android.app.Application;import android.os.Bundle;import android.util.Log;import com.example.lxxcaroline.applicationtest.MainActivity;import com.example.lxxcaroline.applicationtest.SecondActivity;/** * Created by LxxCaroline on 2015/5/3. */public class MyApplication extends Application {    private static final String TAG = "MyApplication";    //声明一个监听Activity们生命周期的接口    private ActivityLifecycleCallbacks activityLifecycleCallbacks = new ActivityLifecycleCallbacks() {        /**         * application下的每个Activity声明周期改变时，都会触发以下的函数。         */        @Override        public void onActivityCreated(Activity activity, Bundle savedInstanceState) {            //如何区别参数中activity代表你写的哪个activity。            if (activity.getClass() == MainActivity.class)                Log.d(TAG, "MainActivityCreated.");            else if(activity.getClass()== SecondActivity.class)                Log.d(TAG, "SecondActivityCreated.");        }        @Override        public void onActivityStarted(Activity activity) {            Log.d(TAG, "onActivityStarted.");        }        @Override        public void onActivityResumed(Activity activity) {            Log.d(TAG, "onActivityResumed.");        }        @Override        public void onActivityPaused(Activity activity) {            Log.d(TAG, "onActivityPaused.");        }        @Override        public void onActivityStopped(Activity activity) {            Log.d(TAG, "onActivityStopped.");        }        @Override        public void onActivitySaveInstanceState(Activity activity, Bundle outState) {        }        @Override        public void onActivityDestroyed(Activity activity) {            Log.d(TAG, "onActivityDestroyed.");        }    };    /**     * onCreate是一个回调接口，android系统会在应用程序启动的时候，在任何应用程序组件（activity、服务、     * 广播接收器和内容提供者）被创建之前调用这个接口。     * 需要注意的是，这个方法的执行效率会直接影响到启动Activity等的性能，因此此方法应尽快完成。     * 最后在该方法中，一定要记得调用super.onCreate()，否则应用程序将会报错。     */    @Override    public void onCreate() {        super.onCreate();        //注册自己的Activity的生命周期回调接口。        registerActivityLifecycleCallbacks(activityLifecycleCallbacks);    }    @Override    public void onTerminate() {        //注销这个接口。        unregisterActivityLifecycleCallbacks(activityLifecycleCallbacks);        super.onTerminate();    }}

跑起来的log，步骤：进入程序，点击首页的按钮，进入第二个页面，然后依次返回到桌面上，log如下：

05-04 10:28:03.489  24885-24885/com.example.lxxcaroline.applicationtest D/MyApplication﹕ MainActivityCreated.05-04 10:28:03.639  24885-24885/com.example.lxxcaroline.applicationtest D/ApplicationTest﹕ MainActivity is created successfully.05-04 10:28:03.639  24885-24885/com.example.lxxcaroline.applicationtest D/MyApplication﹕ onActivityStarted.05-04 10:28:03.649  24885-24885/com.example.lxxcaroline.applicationtest D/MyApplication﹕ onActivityResumed.05-04 10:28:33.361  24885-24885/com.example.lxxcaroline.applicationtest D/MyApplication﹕ onActivityPaused.05-04 10:28:33.391  24885-24885/com.example.lxxcaroline.applicationtest D/MyApplication﹕ SecondActivityCreated.05-04 10:28:33.411  24885-24885/com.example.lxxcaroline.applicationtest D/MyApplication﹕ onActivityStarted.05-04 10:28:33.411  24885-24885/com.example.lxxcaroline.applicationtest D/MyApplication﹕ onActivityResumed.05-04 10:28:33.781  24885-24885/com.example.lxxcaroline.applicationtest D/MyApplication﹕ onActivityStopped.05-04 10:28:36.835  24885-24885/com.example.lxxcaroline.applicationtest D/MyApplication﹕ onActivityPaused.05-04 10:28:36.875  24885-24885/com.example.lxxcaroline.applicationtest D/MyApplication﹕ onActivityStarted.05-04 10:28:36.875  24885-24885/com.example.lxxcaroline.applicationtest D/MyApplication﹕ onActivityResumed.05-04 10:28:37.205  24885-24885/com.example.lxxcaroline.applicationtest D/MyApplication﹕ onActivityStopped.05-04 10:28:37.205  24885-24885/com.example.lxxcaroline.applicationtest D/MyApplication﹕ onActivityDestroyed.05-04 10:28:38.627  24885-24885/com.example.lxxcaroline.applicationtest D/MyApplication﹕ onActivityPaused.05-04 10:28:39.177  24885-24885/com.example.lxxcaroline.applicationtest D/MyApplication﹕ onActivityStopped.05-04 10:28:39.177  24885-24885/com.example.lxxcaroline.applicationtest D/MyApplication﹕ onActivityDestroyed.

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