onSaveInstance、onRestoreInstance執行順序

溫故而知新，記錄一下

兩個activity，從1跳轉到2，打開開發者模式中的不保留活動，輸出一下生命週期，直接上代碼

package com.example.myapplication;

import android.content.Intent;
import android.os.Bundle;
import android.os.PersistableBundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Log.i("MY_TEST", "onCreate");
    }

    @Override
    protected void onStart() {
        super.onStart();
        Log.i("MY_TEST", "onStart");
    }

    @Override
    protected void onResume() {
        super.onResume();
        Log.i("MY_TEST", "onResume");
    }

    @Override
    protected void onPause() {
        super.onPause();
        Log.i("MY_TEST", "onPause");
    }

    @Override
    protected void onStop() {
        super.onStop();
        Log.i("MY_TEST", "onStop");
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        Log.i("MY_TEST", "onDestroy");
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        Log.i("MY_TEST", "onActivityResult");
    }

    @Override
    protected void onNewIntent(Intent intent) {
        super.onNewIntent(intent);
        Log.i("MY_TEST", "onNewIntent");
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        Log.i("MY_TEST", "onSaveInstanceState" + "一個參數");
    }

    @Override
    public void onSaveInstanceState(Bundle outState, PersistableBundle outPersistentState) {
        super.onSaveInstanceState(outState, outPersistentState);
        Log.i("MY_TEST", "onSaveInstanceState" + "兩個參數");
    }

    @Override
    protected void onRestoreInstanceState(Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);
        Log.i("MY_TEST", "onRestoreInstanceState");
    }

    public void jumpTwo(View view) {
        startActivityForResult(new Intent(this, MainActivity2.class), 2);
    }
}

package com.example.myapplication;

import android.content.Intent;
import android.os.Bundle;
import android.os.PersistableBundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;

public class MainActivity2 extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Log.i("MY_TEST", "onCreate2");
    }

    @Override
    protected void onStart() {
        super.onStart();
        Log.i("MY_TEST", "onStart2");
    }

    @Override
    protected void onResume() {
        super.onResume();
        Log.i("MY_TEST", "onResume2");
    }

    @Override
    protected void onPause() {
        super.onPause();
        Log.i("MY_TEST", "onPause2");
    }

    @Override
    protected void onStop() {
        super.onStop();
        Log.i("MY_TEST", "onStop2");
    }


    @Override
    protected void onDestroy() {
        super.onDestroy();
        Log.i("MY_TEST", "onDestroy2");
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        Log.i("MY_TEST", "onActivityResult2");
    }

    @Override
    protected void onNewIntent(Intent intent) {
        super.onNewIntent(intent);
        Log.i("MY_TEST", "onNewIntent2");
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        Log.i("MY_TEST", "onSaveInstanceState2" + "一個參數");
    }

    @Override
    public void onSaveInstanceState(Bundle outState, PersistableBundle outPersistentState) {
        super.onSaveInstanceState(outState, outPersistentState);
        Log.i("MY_TEST", "onSaveInstanceState2" + "兩個參數");
    }

    @Override
    protected void onRestoreInstanceState(Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);
        Log.i("MY_TEST", "onRestoreInstanceState2");
    }
}

第一步：

打開activity1，從activity1跳轉到2，輸入如下：

03-09 12:14:30.595 2298-2298/com.example.myapplication I/MY_TEST: onCreate
03-09 12:14:30.596 2298-2298/com.example.myapplication I/MY_TEST: onStart
03-09 12:14:30.597 2298-2298/com.example.myapplication I/MY_TEST: onResume
03-09 12:14:32.529 2298-2298/com.example.myapplication I/MY_TEST: onPause
03-09 12:14:32.556 2298-2298/com.example.myapplication I/MY_TEST: onCreate2
03-09 12:14:32.557 2298-2298/com.example.myapplication I/MY_TEST: onStart2
03-09 12:14:32.557 2298-2298/com.example.myapplication I/MY_TEST: onResume2
03-09 12:14:32.981 2298-2298/com.example.myapplication I/MY_TEST: onSaveInstanceState一個參數
03-09 12:14:32.981 2298-2298/com.example.myapplication I/MY_TEST: onStop
03-09 12:14:32.996 2298-2298/com.example.myapplication I/MY_TEST: onDestroy

第二部，從activity2返回

03-09 12:15:28.715 2298-2298/com.example.myapplication I/MY_TEST: onPause2
03-09 12:15:28.763 2298-2298/com.example.myapplication I/MY_TEST: onCreate
03-09 12:15:28.764 2298-2298/com.example.myapplication I/MY_TEST: onStart
03-09 12:15:28.764 2298-2298/com.example.myapplication I/MY_TEST: onRestoreInstanceState
03-09 12:15:28.767 2298-2298/com.example.myapplication I/MY_TEST: onActivityResult
03-09 12:15:28.767 2298-2298/com.example.myapplication I/MY_TEST: onResume
03-09 12:15:29.141 2298-2298/com.example.myapplication I/MY_TEST: onStop2
03-09 12:15:29.141 2298-2298/com.example.myapplication I/MY_TEST: onDestroy2

注意點：

1.跳轉過程中，先執行1的onpause，等等onstop，等待2的onresume執行完之後，再執行1的onstop、ondestory

2.onSaveInstanceState每次隱藏activity都會在onpause之後執行（即使activity沒有銷燬也會執行）

3.onRestoreInstance在onstart之後，onActivityResult之前執行