<!-- res/values/strings.xml -->
<resources>
    <string-array name="morning_greetings">
        <item>早安，新的一天開(kāi)始了！</item>
        <item>祝您有美好的一天。</item>
        <item>積極向上，充滿(mǎn)活力！</item>
        <item>早晨的陽(yáng)光真好。</item>
        <item>保持微笑，迎接挑戰(zhàn)。</item>
    </string-array>
</resources>

import android.content.res.Resources;

// ...

// 在您的Activity或Fragment中
Resources res = getResources();
String[] morningGreetingsArray = res.getStringArray(R.array.morning_greetings);

// 此時(shí)，morningGreetingsArray就是一個(gè)包含所有問(wèn)候語(yǔ)的Java字符串?dāng)?shù)組
// 您可以像操作普通數(shù)組一樣操作它，例如：
// String firstGreeting = morningGreetingsArray[0];
// int arrayLength = morningGreetingsArray.length;

import android.content.SharedPreferences;
import android.os.Bundle;
import android.widget.TextView;
import androidx.appcompat.app.AppCompatActivity;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;

public class MainActivity extends AppCompatActivity {

    private static final String PREFS_NAME = "DailyGreetingPrefs";
    private static final String KEY_LAST_UPDATE_DATE = "lastUpdateDate";
    private static final String KEY_CURRENT_INDEX = "currentIndex";

    private SharedPreferences sharedPreferences;
    private TextView dailyGreetingTextView;
    private String[] greetingsArray;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main); // 確保您的布局文件中有TextView，例如ID為dailyGreetingTextView

        dailyGreetingTextView = findViewById(R.id.dailyGreetingTextView);
        sharedPreferences = getSharedPreferences(PREFS_NAME, MODE_PRIVATE);
        greetingsArray = getResources().getStringArray(R.array.morning_greetings);

        displayDailyGreeting();
    }

    // ... (后續(xù)方法)
}

// ... (在MainActivity類(lèi)中)

private void displayDailyGreeting() {
    // 檢查數(shù)組是否為空，避免空指針異常
    if (greetingsArray == null || greetingsArray.length == 0) {
        dailyGreetingTextView.setText("抱歉，沒(méi)有可用的問(wèn)候語(yǔ)。");
        return;
    }

    // 獲取當(dāng)前日期，格式化為"yyyyMMdd"以便比較
    SimpleDateFormat dateFormat = new SimpleDateFormat("yyyyMMdd", Locale.getDefault());
    String todayDate = dateFormat.format(new Date());

    // 從SharedPreferences獲取上次更新日期和當(dāng)前索引
    String lastUpdateDate = sharedPreferences.getString(KEY_LAST_UPDATE_DATE, "");
    int currentIndex = sharedPreferences.getInt(KEY_CURRENT_INDEX, 0);

    // 檢查是否是新的一天
    if (!todayDate.equals(lastUpdateDate)) {
        // 如果是新的一天，將索引遞增并取模，實(shí)現(xiàn)循環(huán)
        currentIndex = (currentIndex + 1) % greetingsArray.length;

        // 保存新的索引和當(dāng)前日期到SharedPreferences
        SharedPreferences.Editor editor = sharedPreferences.edit();
        editor.putString(KEY_LAST_UPDATE_DATE, todayDate);
        editor.putInt(KEY_CURRENT_INDEX, currentIndex);
        editor.apply(); // 使用apply()異步保存，提高性能
    }

    // 顯示對(duì)應(yīng)索引的問(wèn)候語(yǔ)
    dailyGreetingTextView.setText(greetingsArray[currentIndex]);
}

<!-- res/layout/activity_main.xml -->
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:gravity="center"
    android:padding="16dp"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/dailyGreetingTextView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="24sp"
        android:textColor="@android:color/black"
        android:textStyle="bold"
        android:text="每日問(wèn)候?qū)⒃诖孙@示" />

</LinearLayout>