Java onDestroy之后未还原数据的活动

我有两个ActionBarActivity的问题。 我有我的第一个活动（WorkoutizedActivity），它从WorkoutizedActivity中的一个片段开始另一个带有startActivityForResult的活动（A2）。 当我从A2按ActionBar上的后退按钮时，我的第一个活动将被销毁，并将数据保存在onSaveInstanceState中，然后该活动将重新启动，但我不知道如何恢复数据。 以下是不起作用的相关代码：

    public class WorkoutEditActivity extends ActionBarActivity{
        int whatShouldBeSaved = -1;

        Workout workout = null;
        ViewPager viewpager;
        ViewFactory factory = new ViewFactory(getSupportFragmentManager());;

        @Override
        public void onCreate(Bundle savedInstanceState) {
        Log.d("onCreate", "called");
        super.onCreate(savedInstanceState);

        setContentView(R.layout.workout_edit_activity);

        viewpager = (ViewPager) findViewById(R.id.viewPager);
        viewpager.setOffscreenPageLimit(0);
        viewpager.setAdapter(factory);

        viewpager.setOnPageChangeListener(
                new ViewPager.OnPageChangeListener() {
                    @Override
                    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

                    }

                    @Override
                    public void onPageSelected(int position) {
                        if (position == 0) {
                            SettingsFragment.isActivated = true;
                        } else {
                            if (SettingsFragment.isActivated) {
                                SettingsFragment.isActivated = false;
                                InputMethodManager imm = (InputMethodManager) getSystemService(Activity.INPUT_METHOD_SERVICE);
                                imm.toggleSoftInput(InputMethodManager.HIDE_IMPLICIT_ONLY, 0);
                            }
                        }
                    }

                    @Override
                    public void onPageScrollStateChanged(int state) {

                    }
                }
        );

        if (savedInstanceState != null) {
            whatShouldBeSaved = savedInstanceState.getInt("test", -1);
            if (savedInstanceState.getSerializable("workout") != null){
                setWorkout((Workout) savedInstanceState.getSerializable("workout"));
            }
            Log.d("GOT SAVED DATA", "" + whatShouldBeSaved);
        }
        Log.d("CREATE", "created? " + workout);
        Log.d("CREATE", "created? " + whatShouldBeSaved);
        }

        public void setWorkout(Workout w){
        Log.d("WORKOUT", "had workout " + workout);
        workout = w;
        factory.setWorkout(workout);
        Log.d("WORKOUT", "has workout " + workout);
        }

        @Override
        public void onResume() {
        super.onResume();
        Log.d("RESUME", "resuming act");

        SettingsFragment.isActivated = true;
        //factory.setViewPager(viewpager);

        if (getIntent().getExtras() != null){
            if (getIntent().getExtras().containsKey("workout")){
                Log.d("RESUME", "resume has extra");
                setWorkout((Workout) getIntent().getSerializableExtra("workout"));
                whatShouldBeSaved = getIntent().getIntExtra("test", -1);
            }
        } else {
            Log.d("RESUME", "extras did not contain workout2");
        }

        Log.d("RESUME", "created? " + workout);
        Log.d("RESUME", "created? " + whatShouldBeSaved);
        }

        @Override
        public void onPause(){
        super.onPause();
        Log.d("ONPAUSE", "called");
        }


        @Override
        public void onStart(){
        super.onStart();
        Log.d("START", "starting act");
        }

        @Override
        public void onStop(){
        Log.d("STOP", "stopping act");
        super.onStop();
        }

        @Override
        public void onActivityResult(int requestCode, int resultCode, Intent intent) {
        super.onActivityResult(requestCode, resultCode, intent);
        Log.d("onACTRES", "called");
        }

        @Override
        public void onSaveInstanceState(Bundle savedInstanceState) {
        super.onSaveInstanceState(savedInstanceState);
        Log.d("SAVEINSTANCE", "called");
        savedInstanceState.putInt("test", whatShouldBeSaved);
        }

        @Override
        public void onRestoreInstanceState(Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);

        // Restore UI state from the savedInstanceState.
        // This bundle has also been passed to onCreate.
        Log.d("RESTOREINSTANCE", "called");

        whatShouldBeSaved = savedInstanceState.getInt("test", 1);
        Log.d("GOT SAVE", ""+ whatShouldBeSaved);
        }

        @Override
        public void onRestoreInstanceState(Bundle savedInstanceState, PersistableBundle persistentState){
        super.onRestoreInstanceState(savedInstanceState, persistentState);
        Log.d("RESTOREINSTANCE2", "called");
        }

        @Override
        public void onDestroy(){
        super.onDestroy();
        Log.d("DESTROY", "onDestroy called");
        Log.d("DESTROY", "destroying " + workout);
        Log.d("DESTROY", "destroying " + whatShouldBeSaved);
        Log.d("DESTROY", "was destroyed");
        //first = true;
        }
    }

这是我日志的摘录

8151-8151/localhost.fitnessoptimizer D/STOP﹕ stopping act
01-10 13:26:45.110    8151-8151/localhost.fitnessoptimizer D/DESTROY﹕ onDestroy called
01-10 13:26:45.110    8151-8151/localhost.fitnessoptimizer D/DESTROY﹕ destroying Luffy
01-10 13:26:45.110    8151-8151/localhost.fitnessoptimizer D/DESTROY﹕ destroying -1
01-10 13:26:45.110    8151-8151/localhost.fitnessoptimizer D/DESTROY﹕ was destroyed
01-10 13:26:45.118    8151-8151/localhost.fitnessoptimizer D/onCreate﹕ called
01-10 13:26:45.118    8151-8151/localhost.fitnessoptimizer V/Monotype﹕ SetAppTypeFace- try to flip, app = localhost.fitnessoptimizer
01-10 13:26:45.118    8151-8151/localhost.fitnessoptimizer V/Monotype﹕ Typeface getFontPathFlipFont - systemFont = default#default
01-10 13:26:45.126    8151-8151/localhost.fitnessoptimizer W/ViewPager﹕ Requested offscreen page limit 0 too small; defaulting to 1
01-10 13:26:45.126    8151-8151/localhost.fitnessoptimizer D/CREATE﹕ created? null
01-10 13:26:45.126    8151-8151/localhost.fitnessoptimizer D/CREATE﹕ created? 1
01-10 13:26:45.127    8151-8151/localhost.fitnessoptimizer D/START﹕ starting act
01-10 13:26:45.129    8151-8151/localhost.fitnessoptimizer D/RESUME﹕ resuming act
01-10 13:26:45.129    8151-8151/localhost.fitnessoptimizer D/RESUME﹕ extras did not contain workout2
01-10 13:26:45.129    8151-8151/localhost.fitnessoptimizer D/RESUME﹕ created? null
01-10 13:26:45.129    8151-8151/localhost.fitnessoptimizer D/RESUME﹕ created? 1
01-10 13:26:45.152    8151-8151/localhost.fitnessoptimizer D/GOT WORKOUT﹕ null

onRestoreInstanceState永远不会被调用，onCreates savedInstanceState也不包含该信息。 我如何保存或恢复训练（以及应该保存什么，这实际上只是一个调试变量）

PS：我把我的代码放在SnippetJS标签中，因为它从官方网站上下载的时间很长

调用以在终止活动之前从活动中检索每个实例的状态，以便可以在onCreate（Bundle）或onRestoreInstanceState（Bundle）中还原状态（由此方法填充的Bundle将同时传递给这两个）

当您在“活动”中按BACK时，它将关闭，但不会终止。“杀戮”可以由Android系统完成，当应用程序在后台，系统需要临时释放一些资源时

您需要改为使用。

仅当您的活动意外销毁时才会调用onSaveInstanceState（），当前销毁活动时不会调用它。与onRestoreInstanceState（）相同。

---

在官方网站上，

我已经试过了，它确实有效。然而，我发现这是一个糟糕的解决方法，因为我必须将我的训练保存在一个json字符串中，然后在我将它放在那里之后，重新加载它并从一个json字符串中解析它。我真的不明白为什么活动会关闭，而在那之后它又会重新启动。为什么不暂停并继续？@infect如果有助于解决当前问题，请接受并投票回答problem@infect请阅读下一篇文章，它将为您提供有关保存状态的更多详细信息。您的链接说，savedInstanceState位于onCreate参数中，我在示例中尝试了该参数，但它仍然不起作用@感染请仔细阅读所有文章，以了解这是如何工作的，尤其是注意块