安卓List<String> 转一个字符串

时间: 2024-06-15 14:03:59 浏览: 147
在安卓开发中,将一个List<String>转换一个字符串可以使用StringBuilder类来实现。可以按照以下步骤进行转换: 1. 创建一个StringBuilder对象 ```java StringBuilder stringBuilder = new StringBuilder(); ``` 2. 遍历List<String>,将每个元素添加到StringBuilder: ```java for (String str : list) { stringBuilder.append(str); stringBuilder.append(", "); // 可以根据需要添加分隔符 } ``` 3. 移除最后一个多余的分隔符(如果有的话): ```java if (stringBuilder.length() > 0) { stringBuilder.setLength(stringBuilder.length() - 2); // 根据分隔符的长度进行调整 } ``` 4. 获取最终的字符串: ```java String result = stringBuilder.toString(); ``` 这样就可以将List<String>转换为一个字符串。注意,上述代码假设List<String>的变量名为list,你可以根据实际情况进行修改。
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试试Android的List<String> stringList转成String,String转成List<String> stringList

将 List<String> 转成 String 可以使用 String.join 方法,将 List 中的元素连接成一个字符串,每个元素之间用指定的分隔符隔开。例如: ```java List<String> stringList = Arrays.asList("hello", "world", "java"); String joinedString = String.join(",", stringList); System.out.println(joinedString); // 输出:hello,world,java ``` 将 String 转成 List<String> 可以使用 String.split 方法,将字符串按照指定的分隔符分割成多个子字符串,得到一个 String 数组,然后将数组转成 List。例如: ```java String string = "hello,world,java"; String[] splitStrings = string.split(","); List<String> stringList = Arrays.asList(splitStrings); System.out.println(stringList); // 输出:[hello, world, java] ``` 需要注意的是,使用 Arrays.asList 方法将数组转成 List 时,得到的 List 是一个不可变的 List,不能进行添加、删除、修改等操作。如果需要对 List 进行修改,需要将其转成可变的 List,例如: ```java List<String> mutableList = new ArrayList<>(stringList); mutableList.add("android"); System.out.println(mutableList); // 输出:[hello, world, java, android] ```

android 在/storage/emulated/0/AudioProject/MedioVideo/创建一个数据库,将一个List<string>的内容数据保存到这个数据库中,并且重新读取该数据库,将数据读取出来保存到List<string>中

在Android上操作数据库通常使用SQLite,它是一个轻量级的关系型数据库管理系统。首先,你需要在`/storage/emulated/0/AudioProject/MedioVideo/`目录下创建一个SQLite数据库文件。这里我们假设已有一个名为`MedioVideo.db`的数据库。以下是步骤: **步骤1:创建数据库表** 在项目中创建一个SQLiteOpenHelper类,例如`DatabaseHelper.java`,并设置一个对应的SQLiteOpenHelper子类: ```java public class DatabaseHelper extends SQLiteOpenHelper { private static final String DATABASE_NAME = "MedioVideo.db"; private static final int DATABASE_VERSION = 1; private static final String TABLE_NAME = "data_table"; private static final String COLUMN_DATA = "data"; public DatabaseHelper(Context context) { super(context, DATABASE_NAME, null, DATABASE_VERSION); } @Override public void onCreate(SQLiteDatabase db) { String createTableQuery = "CREATE TABLE " + TABLE_NAME + " (" + COLUMN_DATA + " TEXT)"; db.execSQL(createTableQuery); } // 其他方法... } ``` **步骤2:保存List<String>到数据库** 在需要的地方,比如Activity或Fragment中,你可以通过一个ContentProvider来插入数据: ```java List<String> dataList = ...; // 你的字符串列表 // 获取数据库实例 DatabaseHelper dbHelper = new DatabaseHelper(getBaseContext()); SQLiteDatabase db = dbHelper.getWritableDatabase(); for (String data : dataList) { ContentValues contentValues = new ContentValues(); contentValues.put(COLUMN_DATA, data); db.insert(TABLE_NAME, null, contentValues); } db.close(); ``` **步骤3:从数据库读取数据到List<String>** 然后,在需要读取数据的时候,可以这样做: ```java Cursor cursor = dbHelper.rawQuery("SELECT * FROM " + TABLE_NAME, null); if (cursor.moveToFirst()) { List<String> retrievedData = new ArrayList<>(); do { String rowData = cursor.getString(cursor.getColumnIndex(COLUMN_DATA)); retrievedData.add(rowData); } while (cursor.moveToNext()); cursor.close(); } // 现在retrievedData就是从数据库中读取的数据 ```
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Please try later.</string> <string name="error_195">You cannot invite other network members to join.</string> <string name="error_LHConsumerService_login_accountRoleMismatch">Members from other enterprises are not allowed.</string> <string name="error_LHConsumerService_bindGroup_exceedMaxBindGroupNum">Members from other enterprises are not allowed.</string> <string name="error_201">Failed to check the remaining balance.</string> <string name="error_202">Failed to change the mobile number.</string> <string name="error_203">Failed to change the email address.</string> <string name="error_214">Incorrect addedDeviceList format.</string> <string name="error_219">The password cannot be the same as the username or the username in reverse.</string> <string name="error_220">You do not have the administrative permission.</string> <string name="error_221">Failed to uninstall all the plug-ins of the home gateway.</string> <string name="error_224">The new gateway is not registered.</string> <string name="error_225">The new home gateway has been bound.</string> <string name="error_238">Your account has not been bound with a mobile number or email address. The password cannot be retrieved through self service. You are advised to contact your administrator to retrieve the password.</string> <string name="error_239">The mobile number is bound to multiple accounts.</string> <string name="error_240">The email address is bound to multiple accounts.</string> <string name="error_247">Anonymous binding information cannot be queried by using a mobile number or an email address.</string> <string name="error_255">The account has been bound to a gateway, and cannot be bound to another one.</string> <string name="error_272">Incorrect username or password.</string> <string name="error_1002">The interval between requests for sending verification codes is too short.</string> <string name="error_30000117">The home gateway MAC address does not exist.</string> <string name="error_30000118">The home gateway is offline.</string> <string name="error_30000119">The home gateway plug-in does not exist.</string> <string name="error_30000120">The plug-in is not installed or not upgraded on the home gateway.</string> <string name="error__1013">The MAC address (XXX) of your gateway does not exist on the server.</string> <string name="error_2001">The input parameter is empty.</string> <string name="error_40000001">The parameter contains unsupported special characters.</string> <string name="error_40000003">The length is less than the minimum limit.</string> <string name="error_40000004">The parameter is not a numeric type.</string> <string name="error_40000007">Invalid IP address.</string> <string name="net_conn_failed">Connection failed.</string> <string name="error__3">Connection failed.</string> <string name="error__4">The gateway is busy and cannot process the current request. Try again later.</string> <string name="error__5">Operation failed. Please try later.</string> <string name="error__7">Operation failed. Please try later.</string> <string name="error__8">Not supported by the gateway.</string> <string name="error__9">Operation failed. Please try later.</string> <string name="error__10">Your login has expired. Please log in again.</string> <string name="error_280">Failed to send the SMS message. Please try again later.</string> <string name="error_300">The current server version does not support user name registration.</string> <string name="error__102">Camera offline or camera connection failed. Check if the camera is powered on.</string> <string name="error__104">Camera video service address illegal, please report impaired</string> <string name="error__106">Gateway cannot connect to the transit server. Check if the server is online.</string> <string name="error__200">Reached the upper limit.</string> <string name="error__201">When MLO is enabled, the working mode must be 802.11be.</string> <string name="error__203">Saving Wi-Fi settings. Please wait.</string> <string name="error__204">Incorrect request parameter.</string> <string name="error__205">The Wi-Fi frequency band is not enabled. Enable it first.</string> <string name="error__301">Fails to play the real-time video of the camera. Failed to connect to the gateway locally.</string> <string name="error__330">Application control is not enabled. Please enable it first.</string> <string name="error__331">The number of application control policies has reached the upper limit.</string> <string name="error__332">The app control rule does not exist.</string> <string name="error__622">The rate limit periods cannot overlap with each other.</string> <string name="error_028">Your account has been used for login on another device. If this was done without your knowledge, your account and password may have been compromised. Choose Settings > Account And Security to change your account password.</string> <string name="error_2009">Failed to query the package status.</string> <string name="error__99999">Operation failed. Please try later.</string> <string name="error_1017">The MAC address cannot be empty.</string> <string name="error_licence_expire">Licence expired, please contact service provider.</string> <string name="LHConsumerService.bindLocalAccount.hasFamily">The account is already in a family.</string> <string name="LHConsumerService.bindLocalAccount.bound">Already bound to another account.</string> <string name="LHConsumerService.weakvalue.error">The password is too simple.</string> <string name="error_LHConsumerService_feedback_daylimit">The number of problems you reported has reached the upper limit. Try again 24 hours later.</string> <string name="error_306">Failed to send the verification code.The possible cause is that the mobile number format is incorrect or the mobile number has been bound.</string> <string name="error_307">Failed to send the verification code.The possible cause is that the email address format is incorrect or the email address has been bound.</string> <string name="error_308">Failed to send the verification code.The possible cause is that the mobile number format is incorrect or the mobile number is not bound.</string> <string name="error_309">Failed to send the verification code.The possible cause is that the email address format is incorrect or the email address is not bound.</string> <string name="error_310">The client IP address is locked,please try again later.</string> <string name="error_311">The current version does not support multi-factor authentication. Contact the administrator to disable multi-factor authentication.</string> <string name="error__340">The portal function has been enabled. The speed limit cannot be configured. To set the rate limit, disable Portal authentication on the web management page of the gateway.</string> <string name="error_AppSdk_notInitialized">Failed to initialize the app. Please log in again.</string> <string name="error_log_collect_offline">Device is offline</string> <string name="error_log_collect_conflict">Another collection task of the device is in progress.</string> <string name="error_log_collect_failed">Log collection failed</string> <string name="LHConsumerService.domainMigration.notSupportBinding">The server has been switched. Please switch to the corresponding region and register again.</string> <string name="error__41">Failed to set the 5G Wi-Fi because it has been locked. Contact your carrier to enable it first.</string> <string name="error__14">The same Wi-Fi SSID already exists in the current frequency band.</string> <string name="BindGateway_101">You have joined a family. Please refresh the home page and view it.</string> <string name="error_third_platform_user">Third-party users exist, unbinding failed.</string> </resources>

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