Question

我正在研究一个项目，并且遇到了一个我无法理解为什么会发生这种情况的错误。问题是，当我翻转手机的方向时，我想保存得分值。当我记录得分的值时，我注意到问题，即当我改变手机的方向时onCreateView似乎被调用了两次。在第一次调用期间的日志中，它似乎保存了分数值，但是再次调用它来清除分数值。

为什么onCreateView被调用两次并重置得分值？

如何修复它以便只调用onCreateView一次？

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);
}

}

Answer 1

在您的片段代码中尝试存储以下行：

->middleware('auth:api');

在您的片段的if (savedInstanceState != null) { score = savedInstanceState.getInt("score"); }方法中，每次调用设备onCreate时都会调用（因为重新绘制了UI），并且会清除其中的一些参数。

屏幕旋转时重置的android片段savedInstanceState值

1 个答案: