Androidの家計簿アプリをJavaで作成しています。
下記スクショの通り、Spinnerを使って米ドル、日本円、ユーロから通貨を選べるようにしています。
ここでやりたいことは、上記Spinnerで選んだ通貨のシンボルでアプリ上の全ての金額に関わる部分に反映させることです。(例えば、ユーロであれば€のシンボルに)。
下記スクショの例では、図1の通貨設定画面で、例えばEuroを選んだ場合、図2(購入商品入力画面)のEnter PriceのEditTextにデフォルトで設定されている$シンボルを€シンボルに変更するような仕様にしたいです。
通貨設定画面はBudgetTrackerSettingsActivity、購入商品入力画面NewBudgetTrackerと、それぞれ別々のActivityとなるので、BudgetTrackerSettingsActivityで設定した内容を、どのようにNewBudgetTracker含め、別のActivitやクラスに対して反映させるのか、ヒントがあればご教示ください。
よろしくお願いいたします。
追記:
状況を細かく共有するため、新たにCurrency, CurrencySpinnerAdapterクラスを記載しました。
BudgetTrackerSettingsActivity.java
package com.myproject.offlinebudgettrackerappproject; <import箇所は省略> import androidx.appcompat.app.AppCompatActivity; import com.myproject.offlinebudgettrackerappproject.adapter.CurrencySpinnerAdapter; public class BudgetTrackerSettingsActivity extends AppCompatActivity { Spinner spinner; public static String spinnerText; Button currencyBtn; String selectedCurrency; SharedPreferences sharedPreferences; private static final String PREF_CURRENCY_FILENAME = "CURRENCY_SHARED"; private static final String PREF_CURRENCY_VALUE = "currencyValue"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_budget_tracker_settings); Currency.initCurrencies(); spinner = (Spinner) findViewById(R.id.currency_spinner); currencyBtn = (Button) findViewById(R.id.currency_btn); CurrencySpinnerAdapter currencySpinnerAdapter = new CurrencySpinnerAdapter(this, R.layout.currency_spinner_adopter, Currency.getCurrencyArrayList()); spinner.setAdapter(currencySpinnerAdapter); sharedPreferences = getSharedPreferences(PREF_CURRENCY_FILENAME, Context.MODE_PRIVATE); spinner.setSelection(sharedPreferences.getInt(PREF_CURRENCY_VALUE, 0)); spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { @Override public void onItemSelected(AdapterView<?> adapterView, View view, int position, long l) { Currency currency = (Currency) spinner.getSelectedItem(); spinnerText = currency.getCurrency(); currencyBtn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { selectedCurrency = spinnerText; SharedPreferences.Editor editor = sharedPreferences.edit(); editor.putString("CURRENCY", selectedCurrency); editor.putInt(PREF_CURRENCY_VALUE, position); editor.commit(); Toast.makeText(BudgetTrackerSettingsActivity.this, "Currency Saved", Toast.LENGTH_SHORT).show(); Intent intent = new Intent(BudgetTrackerSettingsActivity.this, MainActivity.class); startActivity(intent); finish(); } }); } @Override public void onNothingSelected(AdapterView<?> adapterView) { spinnerText = null; } }); // spinner.setSelection(currency.ordinal()); } }
Currency.java
package com.myproject.offlinebudgettrackerappproject; import java.util.ArrayList; public class Currency { private static ArrayList<Currency> currencyArrayList = new ArrayList<>(); static { initCurrencies(); } private String id; private String currency; public Currency(String id, String currency) { this.id = id; this.currency = currency; } public Currency() { } public String getId() { return id; } public void setId(String id) { this.id = id; } public String getCurrency() { return currency; } public void setCurrency(String currency) { this.currency = currency; } public static void initCurrencies() { Currency usd = new Currency("0", "US Dollars"); currencyArrayList.add(usd); Currency jpy = new Currency("1", "Japanese Yen"); currencyArrayList.add(jpy); Currency euro = new Currency("2", "Euro"); currencyArrayList.add(euro); } public int getCurrencyImage() { switch (getId()) { case "0": return R.drawable.ic_money; case "1": return R.drawable.ic_yen; case "2": return R.drawable.ic_euro; } return R.drawable.ic_money; } public static ArrayList<Currency> getCurrencyArrayList() { return currencyArrayList; } }
CurrencySpinnerAdapter.java
package com.myproject.offlinebudgettrackerappproject.adapter; <import箇所は省略> public class CurrencySpinnerAdapter extends ArrayAdapter<Currency> { LayoutInflater layoutInflater; public CurrencySpinnerAdapter(@NonNull Context context, int resource, @NonNull List<Currency> currencies) { super(context, resource, currencies); layoutInflater = LayoutInflater.from(context); } @NonNull @Override public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) { View rowView = layoutInflater.inflate(R.layout.currency_spinner_adopter, null, true); Currency currency = getItem(position); TextView textView = (TextView) rowView.findViewById(R.id.currency_name_textview); ImageView imageView = (ImageView) rowView.findViewById(R.id.currency_symbol); textView.setText(currency.getCurrency()); imageView.setImageResource(currency.getCurrencyImage()); return rowView; } @Override public View getDropDownView(int position, @Nullable View convertView, @NonNull ViewGroup parent) { if (convertView == null) { convertView = layoutInflater.inflate(R.layout.currency_spinner_adopter, parent, false); } Currency currency = getItem(position); TextView textView = (TextView) convertView.findViewById(R.id.currency_name_textview); ImageView imageView = (ImageView) convertView.findViewById(R.id.currency_symbol); textView.setText(currency.getCurrency()); imageView.setImageResource(currency.getCurrencyImage()); return convertView; } }
HomeFragment.java (sharedPreferences 受け取り箇所)
※上記画像(Home画面)のCurrent Currency下のtextView
sharedPreferences = getActivity().getSharedPreferences(PREF_CURRENCY_FILENAME, 0); //選択された通貨の設定 String currentCurrency = sharedPreferences.getString("CURRENCY", ""); int currentCurrencyNum = sharedPreferences.getInt("PREF_CURRENCY_VALUE", 0); //126行目 Currency currency = Currency.getCurrencyArrayList().get(currentCurrencyNum); currentCurrencyTv.setCompoundDrawablesWithIntrinsicBounds(currency.getCurrencyImage(), 0, 0, 0);
IndexOutOfBoundsException(エラー内容)
2022-06-12 09:57:04.765 32399-32399/com.myproject.offlinebudgettrackerappproject E/AndroidRuntime: FATAL EXCEPTION: main Process: com.myproject.offlinebudgettrackerappproject, PID: 32399 java.lang.IndexOutOfBoundsException: Index: 0, Size: 0 at java.util.ArrayList.get(ArrayList.java:437) at com.myproject.offlinebudgettrackerappproject.HomeFragment.onCreateView(HomeFragment.java:126) at androidx.fragment.app.Fragment.performCreateView(Fragment.java:2963) at androidx.fragment.app.FragmentStateManager.createView(FragmentStateManager.java:518) at androidx.fragment.app.FragmentStateManager.moveToExpectedState(FragmentStateManager.java:282) at androidx.fragment.app.FragmentManager.executeOpsTogether(FragmentManager.java:2189) at androidx.fragment.app.FragmentManager.removeRedundantOperationsAndExecute(FragmentManager.java:2100) at androidx.fragment.app.FragmentManager.execPendingActions(FragmentManager.java:2002) at androidx.fragment.app.FragmentManager.dispatchStateChange(FragmentManager.java:3138) at androidx.fragment.app.FragmentManager.dispatchActivityCreated(FragmentManager.java:3072) at androidx.fragment.app.FragmentController.dispatchActivityCreated(FragmentController.java:251) at androidx.fragment.app.FragmentActivity.onStart(FragmentActivity.java:502) at androidx.appcompat.app.AppCompatActivity.onStart(AppCompatActivity.java:246) at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1432) at android.app.Activity.performStart(Activity.java:7848) at android.app.ActivityThread.handleStartActivity(ActivityThread.java:3294) at android.app.servertransaction.TransactionExecutor.performLifecycleSequence(TransactionExecutor.java:221) at android.app.servertransaction.TransactionExecutor.cycleToPath(TransactionExecutor.java:201) at android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:173) at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:97) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2016) at android.os.Handler.dispatchMessage(Handler.java:107) at android.os.Looper.loop(Looper.java:214) at android.app.ActivityThread.main(ActivityThread.java:7356) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)

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