屏幕旋转时重置android片段savedInstanceState值

我正在做一个项目，遇到了一个我似乎无法理解为什么会发生的错误。问题是，当我翻转手机的方向时，我想保存score的值。当我记录score的值时，我注意到了一个问题，即当我更改手机方向时，

onCreateView

似乎被调用了两次。在第一次调用的日志中，它似乎保存了score的值，但随后再次调用它，清除了score的值

• 为什么

  onCreateView

  会被调用两次并重置score的值
• 如何修复它，以便只调用一次

  onCreateView

  public class SteeringFragment extends Fragment {
  
  
  
  Drawable transparentRadioButton;
  RadioButton rbExcellent, rbGood, rbFair, rbPoor, rbFailing;
  LinearLayout llExcellent, llGood, llFair, llPoor, llFailing;
  
  int score;
  
  
  
  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container,
                           Bundle savedInstanceState) {
      ((AppCompatActivity)getActivity()).getSupportActionBar().setTitle(R.string.steering_title);
  
  
      // Inflate the layout for this fragment
      View view = inflater.inflate(R.layout.fragment_steering, container, false);
  
      if (savedInstanceState != null){
          score = savedInstanceState.getInt("score");
      }
  
  
  
      Log.d("test", String.valueOf(score));
  
  
      llExcellent = (LinearLayout)view.findViewById(R.id.steeringLLExcellent);
      llGood = (LinearLayout)view.findViewById(R.id.steeringLLGood);
      llFair = (LinearLayout)view.findViewById(R.id.steeringLLFair);
      llPoor = (LinearLayout)view.findViewById(R.id.steeringLLPoor);
      llFailing = (LinearLayout)view.findViewById(R.id.steeringLLFailing);
  
      rbExcellent = (RadioButton)view.findViewById(R.id.steeringRadioExcellent);
      rbGood = (RadioButton)view.findViewById(R.id.steeringRadioGood);
      rbFair =  (RadioButton)view.findViewById(R.id.steeringRadioFair);
      rbPoor = (RadioButton)view.findViewById(R.id.steeringRadioPoor);
      rbFailing = (RadioButton)view.findViewById(R.id.steeringRadioFailing);
  
  
      //used to hide the radio button
      transparentRadioButton = new ColorDrawable(Color.TRANSPARENT);
      rbExcellent.setButtonDrawable(transparentRadioButton);
      rbGood.setButtonDrawable(transparentRadioButton);
      rbFair.setButtonDrawable(transparentRadioButton);
      rbPoor.setButtonDrawable(transparentRadioButton);
      rbFailing.setButtonDrawable(transparentRadioButton);
  
  
      //if score already has value set it to the value
      if (score != 0){
          switch (score){
              case 5:
                  rbExcellent.setChecked(true);
                  rbGood.setChecked(false);
                  rbFair.setChecked(false);
                  rbPoor.setChecked(false);
                  rbFailing.setChecked(false);
                  rbExcellent.setBackgroundColor(ContextCompat.getColor(getContext(), R.color.excellentColor));
                  llExcellent.setBackground(ContextCompat.getDrawable(getContext(), R.drawable.radio_boxes_borders));
                  break;
              case 4:
                  rbExcellent.setChecked(false);
                  rbGood.setChecked(true);
                  rbFair.setChecked(false);
                  rbPoor.setChecked(false);
                  rbFailing.setChecked(false);
                  rbGood.setBackgroundColor(ContextCompat.getColor(getContext(), R.color.goodColor));
                  llGood.setBackground(ContextCompat.getDrawable(getContext(), R.drawable.radio_boxes_borders));
                  break;
              case 3:
                  rbExcellent.setChecked(false);
                  rbGood.setChecked(false);
                  rbFair.setChecked(true);
                  rbPoor.setChecked(false);
                  rbFailing.setChecked(false);
                  rbFair.setBackgroundColor(ContextCompat.getColor(getContext(), R.color.fairColor));
                  llFair.setBackground(ContextCompat.getDrawable(getContext(), R.drawable.radio_boxes_borders));
                  break;
              case 2:
                  rbExcellent.setChecked(false);
                  rbGood.setChecked(false);
                  rbFair.setChecked(false);
                  rbPoor.setChecked(true);
                  rbFailing.setChecked(false);
                  rbPoor.setBackgroundColor(ContextCompat.getColor(getContext(), R.color.poorColor));
                  llPoor.setBackground(ContextCompat.getDrawable(getContext(), R.drawable.radio_boxes_borders));
                  break;
              case 1:
                  rbExcellent.setChecked(false);
                  rbGood.setChecked(false);
                  rbFair.setChecked(false);
                  rbPoor.setChecked(false);
                  rbFailing.setChecked(true);
                  rbFailing.setBackgroundColor(ContextCompat.getColor(getContext(), R.color.failingColor));
                  llFailing.setBackground(ContextCompat.getDrawable(getContext(), R.drawable.radio_boxes_borders));
                  break;
          }
      }
  
  
      rbExcellent.setOnClickListener(new View.OnClickListener() {
          @Override
          public void onClick(View v) {
              rbExcellent.setChecked(true);
              rbGood.setChecked(false);
              rbFair.setChecked(false);
              rbPoor.setChecked(false);
              rbFailing.setChecked(false);
  
          }
      });
  
      rbGood.setOnClickListener(new View.OnClickListener() {
          @Override
          public void onClick(View v) {
              rbExcellent.setChecked(false);
              rbGood.setChecked(true);
              rbFair.setChecked(false);
              rbPoor.setChecked(false);
              rbFailing.setChecked(false);
          }
      });
  
      rbFair.setOnClickListener(new View.OnClickListener() {
          @Override
          public void onClick(View v) {
              rbExcellent.setChecked(false);
              rbGood.setChecked(false);
              rbFair.setChecked(true);
              rbPoor.setChecked(false);
              rbFailing.setChecked(false);
          }
      });
  
      rbPoor.setOnClickListener(new View.OnClickListener() {
          @Override
          public void onClick(View v) {
              rbExcellent.setChecked(false);
              rbGood.setChecked(false);
              rbFair.setChecked(false);
              rbPoor.setChecked(true);
              rbFailing.setChecked(false);
          }
      });
  
      rbFailing.setOnClickListener(new View.OnClickListener() {
          @Override
          public void onClick(View v) {
              rbExcellent.setChecked(false);
              rbGood.setChecked(false);
              rbFair.setChecked(false);
              rbPoor.setChecked(false);
              rbFailing.setChecked(true);
          }
      });
  
      rbExcellent.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
          @Override
          public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
              if (isChecked){
  
                  rbExcellent.setBackgroundColor(ContextCompat.getColor(getContext(), R.color.excellentColor));
                  llExcellent.setBackground(ContextCompat.getDrawable(getContext(), R.drawable.radio_boxes_borders));
                  score = 5;
  
  
              }else {
                  rbExcellent.setBackgroundColor(ContextCompat.getColor(getContext(), R.color.textColor));
                  llExcellent.setBackground(null);
                  llExcellent.setPadding(0,0,0,0);
  
              }
          }
      });
  
      rbGood.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
          @Override
          public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
              if (isChecked){
                  rbGood.setBackgroundColor(ContextCompat.getColor(getContext(), R.color.goodColor));
                  llGood.setBackground(ContextCompat.getDrawable(getContext(), R.drawable.radio_boxes_borders));
                  score = 4;
  
              }else {
                  rbGood.setBackgroundColor(ContextCompat.getColor(getContext(), R.color.textColor));
                  llGood.setBackground(null);
                  llGood.setPadding(0,0,0,0);
              }
          }
      });
  
      rbFair.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
          @Override
          public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
              if (isChecked){
                  rbFair.setBackgroundColor(ContextCompat.getColor(getContext(), R.color.fairColor));
                  llFair.setBackground(ContextCompat.getDrawable(getContext(), R.drawable.radio_boxes_borders));
                  score = 3;
  
              }else {
                  rbFair.setBackgroundColor(ContextCompat.getColor(getContext(), R.color.textColor));
                  llFair.setBackground(null);
                  llFair.setPadding(0,0,0,0);
              }
          }
      });
  
      rbPoor.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
          @Override
          public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
              if (isChecked){
                  rbPoor.setBackgroundColor(ContextCompat.getColor(getContext(), R.color.poorColor));
                  llPoor.setBackground(ContextCompat.getDrawable(getContext(), R.drawable.radio_boxes_borders));
                  score = 2;
  
              }else {
                  rbPoor.setBackgroundColor(ContextCompat.getColor(getContext(), R.color.textColor));
                  llPoor.setBackground(null);
                  llPoor.setPadding(0,0,0,0);
              }
          }
      });
  
      rbFailing.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
          @Override
          public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
              if (isChecked){
                  rbFailing.setBackgroundColor(ContextCompat.getColor(getContext(), R.color.failingColor));
                  llFailing.setBackground(ContextCompat.getDrawable(getContext(), R.drawable.radio_boxes_borders));
                  score = 1;
              }else {
                  rbFailing.setBackgroundColor(ContextCompat.getColor(getContext(), R.color.textColor));
                  llFailing.setBackground(null);
                  llFailing.setPadding(0,0,0,0);
              }
          }
      });
  
  
  
  
  
      return view;
  }
  
  
  @Override
  public void onSaveInstanceState(Bundle outState) {
      super.onSaveInstanceState(outState);
  
      outState.putInt("score", score);
  }
  

  }

---

在片段代码中尝试存储以下行：

if (savedInstanceState != null) {
    score = savedInstanceState.getInt("score");
}

---

在片段的

onCreate

方法中，每次旋转设备时都会调用

onCreateView

（因为UI被重新绘制），并且它们的一些参数将被清除

嗨，请读。这可能会有帮助。我看到了这一点，现在我明白了为什么会发生这种情况，但我不明白他对如何修复它的解释。不幸的是，这也不起作用，问题仍然在发生。您可以尝试使用断点查看在旋转设备时savedInstanceState值会发生什么情况。