第一次运行API 26时未加载数据库

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

private static final String DATABASE_NAME = "your_database_name.db";
private static final int DATABASE_VERSION = 1;

// 检查数据库是否已加载
private boolean isDatabaseLoaded() {
    SQLiteDatabase checkDB = null;
    try {
        String dbPath = getApplicationContext().getDatabasePath(DATABASE_NAME).getPath();
        checkDB = SQLiteDatabase.openDatabase(dbPath, null, SQLiteDatabase.OPEN_READONLY);
        checkDB.close();
    } catch (SQLiteException e) {
        // 数据库未加载
        return false;
    }
    // 数据库已加载
    return true;
}

// 加载数据库
private void loadDatabase() {
    if (!isDatabaseLoaded()) {
        // 执行数据库加载逻辑
        // ...
    }
}

// 应用程序启动时调用loadDatabase()方法
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    // ...
    loadDatabase();
    // ...
}

public class DatabaseHelper extends SQLiteOpenHelper {
    private static final String DATABASE_NAME = "your_database_name.db";
    private static final int DATABASE_VERSION = 1;

    public DatabaseHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        // 创建数据库表格
        // ...
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // 升级数据库版本
        // ...
    }
}