Android Studio 之 Activity 的生命周期

Posted 2020-12-01 专注WEB开发技术 @ 修身、齐家、治国、平天下!

android的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: