Android 监听各个Acitivity的生命周期

在Application注册对该应用Activity的监听

package com.example.test.app;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.Application;
import android.os.Bundle;

public class MyApplication extends Application
{
    @SuppressLint("NewApi") @Override
    public void onCreate()
    {
        super.onCreate();
        registerActivityLifecycleCallbacks(new ActivityLifecycleCallbacks()
        {

            @Override
            public void onActivityStopped(Activity activity)
            {
                System.out.println("======>>>>>>" + activity.getClass().getCanonicalName() + " onActivityStopped");
            }

            @Override
            public void onActivityStarted(Activity activity)
            {
                System.out.println("======>>>>>>" + activity.getClass().getCanonicalName() + " onActivityStarted");

            }

            @Override
            public void onActivitySaveInstanceState(Activity activity, Bundle outState)
            {
                System.out.println("======>>>>>>" + activity.getClass().getCanonicalName() + " onActivitySaveInstanceState");

            }

            @Override
            public void onActivityResumed(Activity activity)
            {
                System.out.println("======>>>>>>" + activity.getClass().getCanonicalName() + " onActivityResumed");

            }

            @Override
            public void onActivityPaused(Activity activity)
            {
                System.out.println("======>>>>>>" + activity.getClass().getCanonicalName() + " onActivityPaused");

            }

            @Override
            public void onActivityDestroyed(Activity activity)
            {
                System.out.println("======>>>>>>" + activity.getClass().getCanonicalName() + " onActivityDestroyed");

            }

            @Override
            public void onActivityCreated(Activity activity, Bundle savedInstanceState)
            {
                System.out.println("======>>>>>>" + activity.getClass().getCanonicalName() + " onActivityCreated");
            }
        });
    }
}

两个Activity

package com.example.test;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;

public class MainActivity extends Activity
{

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        startActivity(new Intent(this, SecondActivity.class));
    }
}

package com.example.test;

import android.app.Activity;
import android.os.Bundle;

public class SecondActivity extends Activity
{
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
    }
}

打开应用MainActivity然后进入SecondActivity,生命周期的监听打印如下:

03-21 15:09:53.225: I/System.out(4289): ======>>>>>>com.example.test.MainActivity onActivityCreated
03-21 15:09:53.245: I/System.out(4289): ======>>>>>>com.example.test.MainActivity onActivityStarted
03-21 15:09:53.245: I/System.out(4289): ======>>>>>>com.example.test.MainActivity onActivityResumed
03-21 15:09:53.275: I/System.out(4289): ======>>>>>>com.example.test.MainActivity onActivityPaused
03-21 15:09:53.315: I/System.out(4289): ======>>>>>>com.example.test.SecondActivity onActivityCreated
03-21 15:09:53.315: I/System.out(4289): ======>>>>>>com.example.test.SecondActivity onActivityStarted
03-21 15:09:53.315: I/System.out(4289): ======>>>>>>com.example.test.SecondActivity onActivityResumed
03-21 15:09:53.590: I/System.out(4289): ======>>>>>>com.example.test.MainActivity onActivitySaveInstanceState
03-21 15:09:53.590: I/System.out(4289): ======>>>>>>com.example.test.MainActivity onActivityStopped

可以在通过监听各个Activity做一些统计性的工作，比如多少个Activity处于resume状态，统计Acitivity使用情况等。再比如每个Activity在每个onCreate时候将其放进集合，在要退出程序的时候，通过扫描集合，挨个finish()
square leakcanary工具即使用onActivityDestroyed回调+weakRefence+refrenceQueue判断Activity有没有泄露。（PS：这个是听别人说的，想想确实能做到）

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