共有アクティビティに値するのが難しいフラグメントエラーのアクティビティ

Question

私は現在、自分のクラスプロジェクトのカロリーアプリを開発中です。私はレイアウトのアクティビティを使い始めましたが、私の教授は代わりにフラグメントを使用したいと思っていました。コードをフラグメントに変換しようとしている間に、共有設定XMLに値を保存するのが困難ないくつかの問題が出てきました。私が現在取り組んでいるページは、ユーザーからの情報を取得し、ユーザーが選択した内容に応じてカロリーを決定します。その値は、共有アクティビティに保存され、メインアクティビティに表示されます。

私はアンドロイドスタジオとアプリを開発するのが初めてです。

プロファイルのJavaファイル

`public class Profile extends Fragment implements View.OnClickListener { 

    //adaptors spinners 

    ArrayAdapter<String> HeightFeetAdapter; 
    ArrayAdapter<String> WeightLBSAdapter; 


    //references UI elements 
    Button SaveButton; 

    Spinner weightSpinner; 
    Spinner heightSpinner; 
    Spinner goal; 
    Spinner gender; 
    Spinner activityLevel; 

    EditText age; 
    private Animation anim; 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) { 
    // Inflate the layout for this fragment 


     View myView = inflater.inflate(R.layout.fragment_profile, container, 
     false); 

     String username = 
     getActivity().getIntent().getStringExtra("Username"); 

     TextView userMain = (TextView) myView.findViewById(R.id.User); 
     userMain.setText(username); 

     age =(EditText)myView.findViewById(R.id.editText3); 
     age.setInputType(InputType.TYPE_CLASS_NUMBER); 

     heightSpinner = (Spinner) myView.findViewById(R.id.HeightSpin); 

     weightSpinner = (Spinner) myView.findViewById(R.id.WeightSpin); 

     activityLevel = (Spinner) myView.findViewById(R.id.activity_level); 
     ArrayAdapter<CharSequence> adapter_activity = 
     ArrayAdapter.createFromResource(getActivity(), 
      R.array.activity_level, android.R.layout.simple_spinner_item); 
      adapter_activity.setDropDownViewResource 
     (android.R.layout.simple_spinner_dropdow 
    n_item); 
    activityLevel.setAdapter(adapter_activity); 

    goal = (Spinner) myView.findViewById(R.id.goal); 
    ArrayAdapter<CharSequence> adapter_goal = 
    ArrayAdapter.createFromResource(getActivity(), 
      R.array.goal, android.R.layout.simple_spinner_item); 
     adapter_goal.setDropDownViewResource 
     (android.R.layout.simple_spinner_dropdown_item); 
     goal.setAdapter(adapter_goal); 

    gender = (Spinner) myView.findViewById(R.id.gender); 
     ArrayAdapter<CharSequence> adapter_gender = 
    ArrayAdapter.createFromResource(getActivity(), 
      R.array.gender, android.R.layout.simple_spinner_item); 

     adapter_gender.setDropDownViewResource 
    (android.R.layout.simple_list_item_activated_1); 
    gender.setAdapter(adapter_gender); 


    SaveButton = (Button) myView.findViewById(R.id.savebutton); 
    SaveButton.setOnClickListener(this); 


    initializeSpinnerAdapters(); 
    loadLBVal(); 
    loadFTVal(); 

    anim = AnimationUtils.loadAnimation(getActivity(), R.anim.fading); 
    heightSpinner.startAnimation(anim); 

    anim = AnimationUtils.loadAnimation(getActivity(), R.anim.fading); 
    weightSpinner.startAnimation(anim); 


    anim = AnimationUtils.loadAnimation(getActivity(), R.anim.fading); 
    SaveButton.startAnimation(anim); 

    SharedPreferences userInfo = 
    PreferenceManager.getDefaultSharedPreferences(getActivity()); 
    PreferenceManager.setDefaultValues(getActivity(), 
    R.xml.activity_preference, false); 



    return myView; 
} 






    public void loadLBVal() { 
    weightSpinner.setAdapter(WeightLBSAdapter); 
    // set the default lib value 
    weightSpinner.setSelection(WeightLBSAdapter.getPosition("170")); 
    } 


// load the feets value range to the height spinner 
public void loadFTVal() { 
    heightSpinner.setAdapter(HeightFeetAdapter); 
    // set the default value to feets 
    heightSpinner.setSelection(HeightFeetAdapter.getPosition("5\"05'")); 
    } 


    public void initializeSpinnerAdapters() { 

    String[] weightLibs = new String[300]; 
    // loading spinner values for weight 
    int k = 299; 
    for (int i = 1; i <= 300; i++) { 
     weightLibs[k--] = String.format("%3d", i); 
    } 
    // initialize the weightLibsAdapter with the weightLibs values 
    WeightLBSAdapter = new ArrayAdapter<String>(getContext(), 
    R.layout.activity_spinner_item, weightLibs); 

    WeightLBSAdapter.setDropDownViewResource 
    (android.R.layout.simple_spinner_dropdown_item); 


    String[] heightFeets = new String[60]; 
    // loading values 3"0' to 7"11' to the height in feet/inch 
    k = 59; 
    for (int i = 3; i < 8; i++) { 
     for (int j = 0; j < 12; j++) { 
      heightFeets[k--] = i + "\"" + String.format("%02d", j) + "'"; 
     } 
    } 
    // initialize the heightFeetAdapter with the heightFeets values 

    HeightFeetAdapter = new ArrayAdapter<String>(getContext(), 

    R.layout.activity_spinner_item, heightFeets); 

    HeightFeetAdapter.setDropDownViewResource 
    (android.R.layout.simple_spinner_dropdown_item); 


    } 



    @Override 
    public void onClick(View v) { 

    switch (v.getId()) { 

     case R.id.savebutton: 


      int activityLevel, goal, gender, age; 
      // Get preferences 
      float height = getSelectedHeight(); 
      float weight = getSelectedWeight(); 


      activityLevel = 
    ((Spinner)getActivity().findViewById 
    (R.id.activity_level)).getSelectedItemPosition(); 


      goal = ((Spinner)getActivity(). 
     findViewById(R.id.goal)).getSelectedItemPosition(); 

      gender= ((Spinner)getActivity(). 
     findViewById(R.id.gender)).getSelectedItemPosition(); 


      age = Integer.parseInt(((EditText). 
      getActivity().findViewById(R.id.editText3))); 




      int tdee = calculateTDEE(height,weight,activityLevel,age,gender, 
      goal); 

      // Save preferences in XML 
      SharedPreferences userInfo = getSharedPreferences("userInfo", 
      0); 
      SharedPreferences.Editor editor = userInfo.edit(); 
      editor.putInt("tdee", tdee); 
      editor.commit(); 


      break; 
    } 
    } 


public float getSelectedWeight() { 
    String selectedWeightValue = (String)weightSpinner.getSelectedItem(); 

    return (float) (Float.parseFloat(selectedWeightValue) * 0.45359237); 


} 



public float getSelectedHeight() { 
    String selectedHeightValue = (String)heightSpinner.getSelectedItem(); 

    // the position is feets and inches, so convert to meters and return 
    String feets = selectedHeightValue.substring(0, 1); 
    String inches = selectedHeightValue.substring(2, 4); 
    return (float) (Float.parseFloat(feets) * 0.3048) + 
      (float) (Float.parseFloat(inches) * 0.0254); 

} 



    public int calculateTDEE(float height, float weight, int activityLevel, 
    int 
age, int gender, int goal) { 

    double bmr = (10 * weight) + (6.25 * height) - (5 * age) + 5; 
    if(gender == 1) { 
     bmr = (10* weight) + (6.25 * height) - (5*age) - 161; 
    } 
    double activity = 1.25; 
    switch(activityLevel) { 
     case 1: 
      activity = 1.375; 
      break; 
     case 2: 
      activity = 1.55; 
      break; 
     case 3: 
      activity = 1.725; 
      break; 
     case 4: 
      activity = 1.9; 
      break; 
    } 
    double tdee = bmr * activity; 
    switch(goal) { 
     case 0: 
      tdee -=500; 
      break; 
     case 2: 
      tdee +=500; 
      break; 
    } 
    tdee += .5; 
    return (int) tdee; 
    } 
















    @Override 
    public void onActivityCreated(Bundle savedInstanceState) { 
    super.onActivityCreated(savedInstanceState); 

    } 


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

    } 

    @Override 
    public void onDetach() { 
     super.onDetach(); 
    } 

} 

`

fragment_profileのXML

`

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 

    android:orientation="vertical" 

    android:background="@drawable/imgbackground2" 
    android:weightSum="1"> 
    <TextView 
     android:layout_width="180dp" 
     android:layout_height="wrap_content" 
     android:textAppearance="?android:attr/textAppearanceLarge" 
     android:text="@string/emptyString" 
     android:id="@+id/User" 
     android:layout_marginLeft="0dp" 
     android:layout_marginRight="0dp" 
     android:layout_alignParentTop="true" 
     android:layout_alignEnd="@+id/tv_main_title" /> 
    <TextView 
     android:layout_width="294dp" 
     android:layout_height="65dp" 
     android:text="Please Complete Information" 
     android:textColor="@color/colorBackground" 
     android:layout_gravity="center_horizontal" 
     android:gravity="center" 
     android:textSize="20dp" /> 
    <TableLayout 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content"> 

    <TableRow 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"> 

    <TextView 
     android:layout_width="60dp" 
     android:layout_height="wrap_content" 
     android:textAppearance="?android:attr/textAppearanceLarge" 
     android:text="Age" 
     android:id="@+id/textView12" 
     android:layout_above="@+id/gender" 
     android:layout_alignLeft="@+id/textView5" 
     android:layout_alignStart="@+id/textView5" /> 

    <EditText 
     android:layout_width="50dp" 
     android:layout_height="50dp" 
     android:inputType="number" 
     android:ems="10" 
     android:id="@+id/editText3" 
     android:imeOptions="actionDone" 
     android:layout_alignTop="@+id/gender" 
     android:layout_alignLeft="@+id/editText" 
     android:layout_marginLeft="0dp" 
     android:layout_column="1" /> 
</TableRow> 

</TableLayout> 


    <RelativeLayout 
     android:layout_width="194dp" 
     android:layout_height="26dp"></RelativeLayout> 


    <TextView 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:textAppearance="?android:attr/textAppearanceLarge" 
     android:text="Gender" 
     android:id="@+id/textView11" 
     /> 

    <Spinner 
     android:layout_width="113dp" 
     android:layout_height="40dp" 
     android:id="@+id/gender" 
     android:layout_above="@+id/textView5" 
     android:layout_marginTop="10dp" 
     android:layout_marginBottom="10dp" 
     android:layout_alignStart="@+id/textView4" 
     android:layout_alignEnd="@+id/textView3" 
     android:spinnerMode="dropdown" 
     android:popupBackground="@color/colorBackground" /> 

    <TableLayout 
     android:id="@+id/tableLayout1" 
     android:layout_width="329dp" 
     android:layout_height="wrap_content" 
     android:orientation="horizontal"> 

     <TableRow 
      android:id="@+id/tableRow1" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_marginLeft="5dp" 
      android:layout_marginRight="5dp" 
      android:layout_marginTop="15dp" > 

      <TextView 
       android:id="@+id/textView1" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:layout_marginRight="5dp" 
       android:text="@string/weightLabel" 
       android:textAppearance="?android:attr/textAppearanceLarge" 
       android:textColor="@color/colorBackground" 
       android:textSize="25dp" 
       android:paddingRight="0dp" 
       android:paddingLeft="-2dp" /> 

      <Spinner 
       android:id="@+id/WeightSpin" 
       android:layout_width="fill_parent" 
       android:layout_height="match_parent" 
       android:prompt="@string/weightLabel" 
       android:spinnerMode="dropdown" 
       android:layout_weight="2" 
       android:textAlignment="center" 
       android:popupBackground="@drawable/graybackground2" 

       android:layout_span="2" 
       android:layout_column="1" /> 

     </TableRow> 

     <TableRow 
      android:id="@+id/tableRow2" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_marginLeft="5dp" 
      android:layout_marginRight="5dp" 
      android:layout_marginTop="15dp" > 

     </TableRow> 



     <TableRow 
      android:layout_width="match_parent" 
      android:layout_height="match_parent"> 

      <TextView 
       android:id="@+id/textView2" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:layout_marginRight="5dp" 
       android:text="@string/heightLabel" 
       android:textAppearance="?android:attr/textAppearanceMedium" 
       android:textColor="@color/colorBackground" 
       android:textSize="25dp" 
       android:layout_column="0" 
       android:layout_marginLeft="5dp" /> 

      <Spinner 
       android:id="@+id/HeightSpin" 
       android:layout_width="fill_parent" 
       android:layout_height="match_parent" 
       android:prompt="@string/heightLabel" 
       android:layout_weight="2" 
       android:popupBackground="@drawable/graybackground2" 

       android:spinnerMode="dropdown" 
       android:layout_marginTop="0dp" 
       android:layout_margin="0dp" 
       android:layout_marginBottom="0dp" 
       android:layout_column="1" 
       android:paddingTop="0dp" 
       android:paddingBottom="0dp" 
       android:textAlignment="center" 
       android:paddingStart="5dp" 
       android:layout_marginLeft="0dp" 
       android:layout_span="0" 
       android:layout_marginRight="0dp" /> 


     </TableRow> 

     <TableRow> 

      <TextView 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:textAppearance="?android:attr/textAppearanceLarge" 
       android:text="Activity Level" 
       android:id="@+id/textView7" 
       android:layout_below="@+id/editText" 
       android:layout_centerHorizontal="true" 
       android:layout_marginTop="10dp" /> 

      <Spinner 
       android:layout_width="200dp" 
       android:layout_height="50dp" 
       android:id="@+id/activity_level" 
       android:layout_below="@+id/textView7" 
       android:layout_centerHorizontal="true" 
       android:layout_marginTop="5dp" /> 

     </TableRow> 

     <TableRow> 
      <TextView 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:textAppearance="?android:attr/textAppearanceLarge" 
       android:text="Goal" 
       android:id="@+id/textView8" 
       android:layout_below="@+id/activity_level" 
       android:layout_centerHorizontal="true" 
       android:layout_marginTop="10dp" /> 

      <Spinner 
       android:layout_width="200dp" 
       android:layout_height="50dp" 
       android:id="@+id/goal" 
       android:layout_below="@+id/textView8" 
       android:layout_centerHorizontal="true" 
       android:layout_marginTop="5dp" 
       android:spinnerMode="dropdown" /> 
     </TableRow> 
    </TableLayout> 

    <Button 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="Save" 
     android:id="@+id/savebutton" 
     android:radius="10dp" 
     android:textColor="@color/colorBackground" 
     android:onClick="saveAction" 
     android:layout_alignParentBottom="true" 
     android:layout_toEndOf="@+id/editText3" 
     android:layout_gravity="right" /> 


</LinearLayout> 

`

断片home.java

import java.util.ArrayList; 



    public class FragmentHome extends Fragment implements 
    View.OnClickListener { 


    private TextView caloriesTotal; 

    private TextView caloriesRemain; 

    private ListView listView; 
    private LinearLayout mLayout; 

    private Animation anim; 

    ImageButton AddEntrybtn; 
    ImageButton ResetEntry; 
    Context context; 

    int goalCalories; 
    int totalCalorie; 



    Button mButton; 

    //Database 
    private DatabaseHandler dba; 

    private ArrayList<Food> dbFoods = new ArrayList<>(); 
    private CustomListViewAdapter foodAdapter; 
    private Food myFood ; 



    //fragment 
    private android.support.v4.app.FragmentManager fragmentManager; 
    private FragmentTransaction fragmentTransaction; 

    public FragmentHome() { 
     // Required empty public constructor 
    } 




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

    View myView = inflater.inflate(R.layout.fragment_home, container, 
    false); 



    caloriesTotal = (TextView) myView.findViewById(R.id.tv_calorie_amount); 

    caloriesRemain = (TextView) myView.findViewById(R.id.calorieRemain); 

    listView = (ListView) myView.findViewById(R.id.ListId); 




    SharedPreferences prefs = 
    PreferenceManager.getDefaultSharedPreferences(getActivity()); 
    PreferenceManager.setDefaultValues(getActivity(), 
    R.xml.activity_preference, false); 

    goalCalories = 
    Integer.parseInt(prefs.getString("prefs_key_daily_calorie_amount", 
    "2000")); 



    AddEntrybtn = (ImageButton) myView.findViewById(R.id.AddItems); 




    AddEntrybtn.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View arg0) { 


      ((appMain) getActivity()).loadSelection(4); 


     } 
    }); 



    ResetEntry = (ImageButton) myView.findViewById(R.id.ResetEntry); 
    ResetEntry.setOnClickListener(this); 







    refreshData(); 



    anim= AnimationUtils.loadAnimation(getActivity(), R.anim.fading); 
    listView.startAnimation(anim); 

    return myView; 


    } 




    public void reset() { 

    // 


    dbFoods.clear(); 

    dba = new DatabaseHandler(getActivity()); 

    ArrayList<Food> foodsFromDB = dba.getFoods(); 


    //Loop 
    for (int i = 0; i < foodsFromDB.size(); i ++){ 

     String name = foodsFromDB.get(i).getFoodName(); 
     String date = foodsFromDB.get(i).getRecordDate(); 
     int cal = foodsFromDB.get(i).getCalories(); 
     int foodId = foodsFromDB.get(i).getFoodId(); 

     Log.v("Food Id", String.valueOf(foodId)); 

     myFood= new Food(); 
     myFood.setFoodId(foodId); 
     myFood.setFoodName(name); 
     myFood.setCalories(cal); 
     myFood.setRecordDate(date); 

     dbFoods.clear(); 

     dbFoods.remove(myFood); 
     foodsFromDB.remove(myFood); 
     dba.deleteFood(foodId); 
    } 
    dba.close(); 

    //setting food Adapter: 
    foodAdapter = new CustomListViewAdapter(getActivity(), 
    R.layout.row_item,dbFoods); 
    listView.setAdapter(foodAdapter); 
    foodAdapter.notifyDataSetChanged(); 



    anim= AnimationUtils.loadAnimation(getActivity(), R.anim.fading); 
    listView.startAnimation(anim); 


    } 



    public void refreshData(){ 




    dbFoods.clear(); 

    dba = new DatabaseHandler(getActivity()); 

    ArrayList<Food> foodsFromDB = dba.getFoods(); 

    totalCalorie = dba.totalCalories(); 




    String formattedCalories = Utils.formatNumber(totalCalorie); 
    String formattedRemain = Utils.formatNumber(goalCalories - 
    totalCalorie); 


    //setting the editTexts: 


    caloriesTotal.setText("Total Calories: " + formattedCalories); 

    caloriesRemain.setText(formattedRemain); 




    SharedPreferences prefs = 
    PreferenceManager.getDefaultSharedPreferences(getContext()); 
    PreferenceManager.setDefaultValues(getActivity(), 
    R.xml.activity_preference, false); 




    goalCalories = 
    Integer.parseInt(prefs.getString("prefs_key_daily_calorie_amount", 
    "2000")); 




    //Loop 
    for (int i = 0; i < foodsFromDB.size(); i ++){ 

     String name = foodsFromDB.get(i).getFoodName(); 
     String date = foodsFromDB.get(i).getRecordDate(); 
     int cal = foodsFromDB.get(i).getCalories(); 
     int foodId = foodsFromDB.get(i).getFoodId(); 

     Log.v("Food Id", String.valueOf(foodId)); 

     myFood= new Food(); 
     myFood.setFoodId(foodId); 
     myFood.setFoodName(name); 
     myFood.setCalories(cal); 
     myFood.setRecordDate(date); 

     dbFoods.add(myFood); 
    } 
    dba.close(); 

    //setting food Adapter: 
    foodAdapter = new CustomListViewAdapter(getActivity(), 
    R.layout.row_item,dbFoods); 
    listView.setAdapter(foodAdapter); 
    foodAdapter.notifyDataSetChanged(); 

    anim= AnimationUtils.loadAnimation(getActivity(), R.anim.fading); 
    listView.startAnimation(anim); 

} 


    //save prefs 
    public void savePrefs(String key, int value) { 

    SharedPreferences sharedPreferences = 
    PreferenceManager.getDefaultSharedPreferences(getContext()); 
    SharedPreferences.Editor editor = sharedPreferences.edit(); 
    editor.putInt(key, value); 
    editor.apply(); 
    } 
    //get prefs 
    public int loadPrefs(String key, int value) { 
    SharedPreferences sharedPreferences = 
    PreferenceManager.getDefaultSharedPreferences(getContext()); 
    return sharedPreferences.getInt(key, value); 
    } 




@Override 
    public void onActivityCreated(Bundle savedInstanceState) { 
    super.onActivityCreated(savedInstanceState); 

    Bundle username = getActivity().getIntent().getExtras(); 



    String username1 = username.getString("Username"); 

    TextView userMain= (TextView) getView().findViewById(R.id.User); 

    userMain.setText(username1); 




    } 


    @Override 
    public void onResume() { 
    super.onResume(); 



} 

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

} 

    @Override 
    public void onDetach() { 
    super.onDetach(); 

    startActivity(new Intent(getContext(),MainActivity.class)); 
    } 


    @Override 
    public void onClick(View v) { 
     switch (v.getId()) { 
     case R.id.AddItems: 

      AddEntry addEntry = new AddEntry(); 

      fragmentTransaction = fragmentManager.beginTransaction(); 
      fragmentTransaction.addToBackStack(null); 
      fragmentTransaction.replace(R.id.FragmentHolder,addEntry) 

        .commit(); 


      break; 

     case R.id.action_settings: 

      Intent preferenceScreenIntent = new Intent(getContext(), 
      PreferenceScreenActivity.class); 
      startActivity(preferenceScreenIntent); 



      break; 


     case R.id.ResetEntry: 


      reset(); 
      anim= AnimationUtils.loadAnimation(getActivity(), 
      R.anim.fading); 
      listView.startAnimation(anim); 
      break; 


     } 


    } 
} 

preference.xml

<PreferenceScreen  
    xmlns:android="http://schemas.android.com/apk/res/android"> 

    <PreferenceCategory android:title="User Settings"> 
    <EditTextPreference 
    android:title="Daily Calorie Amount" 
    android:inputType="number" 
    android:defaultValue="2000" 
    android:key="@string/prefs_key_daily_calorie_amount" 
    android:summary="@string/prefs_description_daily_calorie_amount" /> 




    </PreferenceCategory> 



    </PreferenceScreen> 

Answer 1

あなたが呼び出したい関数の前にgetContext()かgetActivity()を使用することができます。 getContext().getSharedPreferences(),getContext().getFilesDir()など