onDestroy后未还原数据的活动

Question

我有两个ActionBarActivities的问题。我有我的第一个活动( WorkoutEditActivity )，它使用startActivityForResult从WorkoutEditActivity中的一个片段开始另一个活动(A2)。当我从ActionBar按下A2上的Back按钮时，我的第一个活动就会被销毁，并将数据保存在onSaveInstanceState中，然后重新启动该活动，但我不知道如何恢复数据。以下是不起作用的相关守则：

    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;
        }
    }

这是我原著的摘录

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也不包含这些信息。如何保存或恢复锻炼(以及whatShouldBeSaved，它实际上只是一个调试变量)？

PS:我把我的代码放在片段js标签中，因为它很长。

Answer 1

来自官方网站onSaveInstanceState

调用以从活动中检索每个实例的状态，以便在onCreate( Bundle )或onRestoreInstanceState(Bundle)中恢复状态(此方法填充的绑定将同时传递给这两种状态)。

当你按回击活动时，它会被关闭，但不会被杀死。“杀戮”可以由Android系统来完成，当应用程序处于后台时，系统需要暂时释放一些资源。

您需要使用共享偏好代替。

Answer 2

只有当您的活动意外地被销毁时，onSaveInstanceState()才会被调用，而当当前的活动被销毁时，它不会被调用。onRestoreInstanceState()也是如此。

官方网站重新创造一个活动