【发布时间】：2015-07-26 14:34:34
【问题描述】：
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，首选项被调用两次，第二次重置为它的初始空值。这是它发生的唯一片段，我已经能够将其缩小到该行
activity.setRequestedOrientation(
ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
是否有一种特定的正确方法可以在横向上共享偏好
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 :)
干杯
史蒂夫
///...... 编辑............\\\ 添加在设置片段代码中
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();
}}
【问题讨论】：
-
相关首选项在哪里设置？阅读偏好不能改变它的价值。我猜在读取之间发生了一些事情。
-
@Jonathan727 - 偏好设置在另一个片段中，这是唯一有问题的片段，所有其他片段都可以正常工作，但不要使用横向。我感觉这与设置方向时获取应用程序上下文有关。如果我删除方向线，它应该可以正常工作，但我需要该片段处于横向
-
如果设备的方向已经是纵向的，是否会发生这种情况？
-
@Jonathan727 - 不，只有在设备处于横向模式时才会发生
-
这听起来像是您的活动在横向模式下被破坏和重新创建的副作用。
标签： android android-layout android-fragments sharedpreferences android-sensors