android - 为什么在onStart之后不调用onRestoreInstanceState？

我正在尝试测试onRestoreInstanceState方法以及何时(确切地)调用它。因此，我按照以下步骤操作:

开始我的 Activity 。 onCreate -- > onStart --> onResume称为。

按下模拟器上的“主页”按钮。 onPause --> onSaveInstanceState --> onStop称为。

单击启动器中的图标，然后再次启动我的 Activity 。 onRestart --> onStart --> onResume称为。

我的Java代码:

package com.test.demostate.app;

import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;


 public class MainActivity extends ActionBarActivity {
   private int visiters=0;

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

   }

  @Override
   protected void onPause() {
      super.onPause();
       Log.d("TAG","onPause");
  }

  @Override
   protected void onStop() {
       super.onStop();
       Log.d("TAG","onStop");
   }

   @Override
   protected void onStart() {
       super.onStart();
       Log.d("TAG","onStart");
   }

   @Override
    protected void onRestart() {
       super.onRestart();
       Log.d("TAG","onRestart");

   }

    @Override
     protected void onResume() {
       super.onResume();
        visiters++;
        Log.d("TAG","onResume");
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putInt("visiters",visiters);
        Log.d("TAG",visiters+" visiters  was saved ");
    }

    @Override
     protected void onRestoreInstanceState(Bundle savedInstanceState) {
         super.onRestoreInstanceState(savedInstanceState);
        visiters=savedInstanceState.getInt("visiters");
         Log.d("TAG",visiters+" visiters was restored");
    }

     @Override
    protected void onDestroy() {
        super.onDestroy();
        Log.d("TAG","onDestroy");
    }
}

从文档:Instead of restoring the state during onCreate() you may choose to implement onRestoreInstanceState(), which the system calls after the onStart() method .
因此，onRestoreInstanceState被称为

Activity 被销毁后的

onPause --> onStop --> onDestroy然后是onCreate --> onRestoreInstanceState --> onResume(例如由于屏幕旋转)

停止 Activity 后的

onPause --> onStop --> onRestart --> onStart --> onRestoreInstanceState --> onResume(例如，由于按下主页图标)

但是为什么在onStart之后不调用它呢？

谢谢

最佳答案

仅在onStart()被调用的情况下，在onSaveInstanceState()之后。

从文档中:



Activity#onRestoreInstanceState()

关于android - 为什么在onStart之后不调用onRestoreInstanceState？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/24130726/