Android 片段重置共享首选项的横向方向

Question

我正在使用共享首选项来跟踪保存在设备上的管理代码，我注意到当我进入这个具有横向方向的特定片段时，首选项会被调用两次，第二次是重置为其初始空值。这是它发生的唯一片段，我已经能够将它缩小到行

activity.setRequestedOrientation(
                ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);

是否有一种特定的正确方法可以在横向模式下共享首选项

这是代码

@Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        final Activity activity = getActivity();

        SharedPreferences sharedpreferences = activity.getSharedPreferences(MyPREFERENCES, Context.MODE_PRIVATE);
        Boolean Admin_Mode = sharedpreferences.getBoolean("AdminCode", false);
        String IPaddress = sharedpreferences.getString("IP Address", "");

        System.out.println(IPaddress);
        System.out.println(Admin_Mode);

        View rootView = inflater.inflate(R.layout.augmented_reality_view, container, false);

        ActionBar actionBar = ((ActionBarActivity)activity).getSupportActionBar();

        actionBar.hide();

        System.out.println("here");


        activity.setRequestedOrientation(
                ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);

        mSensorManager = (SensorManager)getActivity().getSystemService(Context.SENSOR_SERVICE);

        mRotationVectorSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_ROTATION_VECTOR);
        mMagneticSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD);


        mSensorManager.registerListener(this, mRotationVectorSensor, 10000);
        mSensorManager.registerListener(this, mMagneticSensor, 10000);

        HeadTracker = (ToggleButton) rootView.findViewById(R.id.HeadTracker);


        return rootView;
    }

    @Override
    public void onSensorChanged(SensorEvent event) {

        if (HeadTracker.isChecked() == true) {

            if (event.sensor.getType() == Sensor.TYPE_ROTATION_VECTOR) {

                SensorManager.getRotationMatrixFromVector(
                        mRotationMatrix, event.values);

                if (mRotationMatrix[2] >= 0.6 && mRotationMatrix[0] >= -0.1 && mRotationMatrix[0] <= 0.2){

                    Left = true;
                    Right = false;

                }
                else if (mRotationMatrix[2] <= -0.8 && mRotationMatrix[0] >= -0.1 && mRotationMatrix[0] <= 0.2){

                    Left = false;
                    Right = true;
                }
                else{
                    Left = false;
                    Right = false;;
                }

            }

        }

        if (event.sensor.getType() == Sensor.TYPE_MAGNETIC_FIELD) {

            if(event.values[2] >= 390){
                MagnetButtonPressed = true;
            }
            else{
                MagnetButtonPressed = false;
            }

        }

    }

    @Override
    public void onAccuracyChanged(Sensor sensor, int accuracy) {

    }

    @Override
    public void onPause()
    {
        super.onPause();
        mSensorManager.unregisterListener(this);
    }

任何建议都是史诗般的:)

干杯

史蒂夫

///……编辑…………\\\ 添加到设置片段代码

public class Settings extends PreferenceFragment {

public SharedPreferences sharedpreferences;
public static final String MyPREFERENCES = "MyPrefs" ;

String IPaddress;
int PortNumber;
Boolean Admin_Mode;


public Settings() {
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    View rootView = inflater.inflate(R.layout.settings, container, false);

    getActivity().setRequestedOrientation(
            ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);


    final SharedPreferences sharedpreferences = getActivity().getSharedPreferences(MyPREFERENCES,Context.MODE_PRIVATE);

    IPaddress = sharedpreferences.getString("IP Address","");
    PortNumber = sharedpreferences.getInt("Port Numner", 1);
    Admin_Mode = sharedpreferences.getBoolean("AdminCode", false);

    final EditText mEdit   = (EditText)rootView.findViewById(R.id.ipaddress);
    final EditText mEdit2   = (EditText)rootView.findViewById(R.id.portnumber);
    final EditText AdminCommandBox = (EditText)rootView.findViewById(R.id.AdminCommandBox);

    mEdit.setText(IPaddress);
    String strI = Integer.toString(PortNumber);
    mEdit2.setText(strI);


    Button clickButton = (Button) rootView.findViewById(R.id.Update_Settings);
    clickButton.setOnClickListener( new View.OnClickListener() {

        @Override
        public void onClick(View v) {


            SharedPreferences.Editor editor = sharedpreferences.edit();
            editor.putString("IP Address", mEdit.getText().toString());
            editor.putInt("Port Numner", Integer.parseInt(mEdit2.getText().toString()));
            editor.commit();

            Toast.makeText(getActivity(),"Port and Ip Updated!",Toast.LENGTH_SHORT).show();


        }
    });

    final Button Authorise = (Button) rootView.findViewById(R.id.Authorise_Button);

    if (Admin_Mode == false){Authorise.setText("Authorise");}
    else if (Admin_Mode == true){Authorise.setText("Deactivate");}

    Authorise.setOnClickListener( new View.OnClickListener() {

        @Override
        public void onClick(View v) {

            if (Admin_Mode == false){

                if (AdminCommandBox.getText().toString().equals("FerasQUT123")) {

                    SharedPreferences.Editor editor = sharedpreferences.edit();
                    editor.putBoolean("AdminCode", true);
                    editor.commit();

                    Toast.makeText(getActivity(),"Code Authorised",Toast.LENGTH_SHORT).show();

                    Authorise.setText("Deactivate");

                }

                else{

                    Toast.makeText(getActivity(),"Please Enter the Correct Code",Toast.LENGTH_SHORT).show();

                }


            }
            else if (Admin_Mode == true){

                SharedPreferences.Editor editor = sharedpreferences.edit();
                editor.putBoolean("AdminCode", false);
                editor.commit();

                Toast.makeText(getActivity()," Deactivated",Toast.LENGTH_SHORT).show();

                Authorise.setText("Authorise");

            }


        }
    });


    return rootView;
}



public void onDestroy() {
    super.onDestroy();

}}

Answer 1

In the shared preference i get the state of the admin mode at the beginning of the on create, i set it in the main activity to false and then update it in the settings fragment if the correct code is entered.

您的问题是您在 activity 的 onCreate 方法中将管理模式设置为 false。当屏幕方向改变时，activity 将被销毁并重新创建——因此 onCreate 将被再次调用，这会将您的管理模式首选项设置为 false。

Android 片段重置共享首选项的横向方向

Android Landscape Orientation on Fragment Resetting Shared Preferences

android

sharedpreferences

android-layout

android-fragments

android-sensors