Android Studio 之 Activity 的生命周期

翻转屏幕，会重新加载Activity

package com.example.activitylivecycle;

import android.os.Bundle;

import android.util.Log;

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

    //定义 TAG 方便自己容易查找日志

    //翻转屏幕，Activity 会重新创建加载

    String TAG = "myTag";

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        Log.d(TAG,"onCreate: ");

    }

    @Override

    protected void onStart() {

        super.onStart();

        Log.d(TAG,"onStart: ");

    }

    @Override

    protected void onResume() {

        super.onResume();

        Log.d(TAG,"onResume: ");

    }

    @Override

    protected void onPause() {

        super.onPause();

        Log.d(TAG,"onPause: ");

    }

    @Override

    protected void onStop() {

        super.onStop();

        Log.d(TAG,"onStop: ");

    }

    @Override

    protected void onRestart() {

        super.onRestart();

        Log.d(TAG,"onRestart: ");

    }

    @Override

    protected void onDestroy() {

        super.onDestroy();

        Log.d(TAG,"onDestroy: ");

    }

}

　　

打开app后产生的事件

2019-11-01 19:28:59.070 3334-3334/com.example.activitylivecycle D/myTag: onCreate:

2019-11-01 19:28:59.071 3334-3334/com.example.activitylivecycle D/myTag: onStart:

2019-11-01 19:28:59.072 3334-3334/com.example.activitylivecycle D/myTag: onResume:

屏幕翻转后执行顺序

2019-11-01 19:29:10.748 3334-3334/com.example.activitylivecycle D/myTag: onPause:

2019-11-01 19:29:10.772 3334-3334/com.example.activitylivecycle D/myTag: onStop:

2019-11-01 19:29:10.772 3334-3334/com.example.activitylivecycle D/myTag: onDestroy:

2019-11-01 19:29:10.792 3334-3334/com.example.activitylivecycle D/myTag: onCreate:

2019-11-01 19:29:10.807 3334-3334/com.example.activitylivecycle D/myTag: onStart:

2019-11-01 19:29:10.811 3334-3334/com.example.activitylivecycle D/myTag: onResume: