发表2 分钟读完 (大约268个字)

自定义ImageSpan之行居中，可设置左右间距

自定义 ImageSpan 之行居中，可设置左右间距

image-20241126200147

实现功能：

  1. Image 所在行居中显示
  2. 可以设置图片和前后文本的间距
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import android.content.Context
import android.graphics.Canvas
import android.graphics.Paint
import android.graphics.drawable.Drawable
import android.text.style.ImageSpan

open class MarginImageSpan(
    context: Context,
    drawableRes: Int,
    val l: Int = 0,
    val r: Int = 0
) : ImageSpan(context, drawableRes) {

    override fun getSize(
        paint: Paint,
        text: CharSequence?,
        start: Int,
        end: Int,
        fm: Paint.FontMetricsInt?
    ): Int {
        val d: Drawable = drawable
        val rect = d.bounds

        if (fm != null) {
            val var7 = Paint.FontMetricsInt()
            paint.getFontMetricsInt(var7)
            fm.ascent = var7.ascent
            fm.descent = var7.descent
            fm.top = var7.top
            fm.bottom = var7.bottom
        }

        return l + rect.right + r
    }

    override fun draw(
        canvas: Canvas,
        text: CharSequence,
        start: Int,
        end: Int,
        x: Float,
        top: Int,
        y: Int,
        bottom: Int,
        paint: Paint
    ) {
        // image to draw
        val b = drawable
        // font metrics of text to be replaced
        val fm = paint.fontMetricsInt
        var transY = ((y + fm.descent + y + fm.ascent) / 2 - b.bounds.bottom / 2)
        // to check the last line.(当 image 在单独一行显示时可能会存在这个问题）
        if (transY > bottom - b.bounds.bottom) transY = bottom - b.bounds.bottom
        //
        val transX = x + l
        canvas.save()
        canvas.translate(transX, transY.toFloat())
        b.draw(canvas)
        canvas.restore()
    }
}

使用场景

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val spanStr = SpannableStringBuilder("#")
spanStr.append(data.seriesName)
val imageSpan = MarginImageSpan(context, R.drawable.home_ic, 0, 3.dp)
// 创建 ImageSpan
spanStr.setSpan(imageSpan, 0, 1, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)

发表1 分钟读完 (大约140个字)

HDC常用功能

SDK 版本：HarmonyOS NEXT Developer Beta2 SDK (5.0.0.31)
DevEco-Studio 版本：DevEco Studio NEXT Developer Beta2 (5.0.3.502）
工程机版本：ALN-AL00 NEXT.0.0.31

0x01 鸿蒙样机升级，查询软件版本和序列号

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## 获取 OTA 系统(鸿蒙)软件版本
$ hdc shell param get const.product.software.version

## 获取序列号(SN)
$ hdc list targets

麻烦升级 NEXT.0.0.68 版本
OTA 系统版本号
ALT-AL10 5.0.0.66(SP6C00E66R6P7log)
序列号
22M0224313000155

0x02 鸿蒙手机抓取全量日志保存到本地文件

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hdc shell hilog -Q domainoff
hdc shell hilog -Q pidoff
hdc shell hilog -b D
hdc hilog >> d://txt.log
发表3 分钟读完 (大约383个字)

鸿蒙-使用系统文件预览不同类型的本地文件

SDK 版本：HarmonyOS NEXT Developer Beta2 SDK (5.0.0.31)
DevEco-Studio 版本：DevEco Studio NEXT Developer Beta2 (5.0.3.502）
工程机版本：ALN-AL00 NEXT.0.0.31

使用系统文件预览不同类型的本地文件

MediaUtils.ets

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/*
 * Copyright (c) 2024. Dench.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import { fileUri } from "@kit.CoreFileKit";
import { BusinessError } from "@kit.BasicServicesKit";
import { filePreview } from "@kit.PreviewKit";
import { uniformTypeDescriptor } from "@kit.ArkData";

/**
 * filePreview（文件预览）
 */
export function openSystemPreview(context: Context, path: string) {
  // let uiContext = getContext(this);
  // let displayInfo: filePreview.DisplayInfo = {
  //   x: 100,
  //   y: 100,
  //   width: 800,
  //   height: 800
  // };
  const uri = fileUri.getUriFromPath(path);
  const mimeType = getFileMimeType(path);
  console.info("uri:" + uri);
  console.info("mimeType:" + mimeType);
  let fileInfo: filePreview.PreviewInfo = {
    uri: uri,
    mimeType: mimeType,
  };
  filePreview
    .openPreview(context, fileInfo)
    .then(() => {
      console.info("Succeeded in opening preview");
    })
    .catch((err: BusinessError) => {
      console.error(
        `Failed to open preview, err.code = ${err.code}, err.message = ${err.message}`
      );
    });
}

/**
 * 根据文件后缀查询对应文件的 mimeType
 */
export function getFileMimeType(path: string): string {
  if (path.indexOf(".") != -1) {
    try {
      const ext = "." + path.split(".").pop();
      console.info("ext:" + ext);
      // 2.可根据 “.mp3” 文件后缀查询对应UTD数据类型，并查询对应UTD数据类型的具体属性
      let typeId1 =
        uniformTypeDescriptor.getUniformDataTypeByFilenameExtension(ext);
      console.info("typeId1:" + typeId1);
      let typeObj1 = uniformTypeDescriptor.getTypeDescriptor(typeId1);
      // console.info('typeId:' + typeObj1.typeId);
      console.info("belongingToTypes:" + typeObj1.belongingToTypes);
      // console.info('description:' + typeObj1.description);
      // console.info('referenceURL:' + typeObj1.referenceURL);
      // console.info('filenameExtensions:' + typeObj1.filenameExtensions);
      console.info("mimeTypes:" + typeObj1.mimeTypes);
      return typeObj1.mimeTypes[0];
    } catch (e) {}
  }
  return "text/plain";
}

Reference

https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/preview-arkts-V5#section1081123302517

https://developer.huawei.com/consumer/cn/doc/harmonyos-guides-V5/uniform-data-type-descriptors-V5

发表2 分钟读完 (大约239个字)

文件大小最大两位小数显示

SDK 版本：HarmonyOS NEXT Developer Beta2 SDK (5.0.0.31)
DevEco-Studio 版本：DevEco Studio NEXT Developer Beta2 (5.0.3.502）
工程机版本：ALN-AL00 NEXT.0.0.31

文件大小最大两位小数显示

FileUtil.ets

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/*
 * Copyright (c) 2024. Dench.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import { intl } from "@kit.LocalizationKit";

export class FileUtil {
  /**
   * 文件大小最大两位小数显示
   */
  getFileSizeStr(size?: number): string {
    const numberFormat = new intl.NumberFormat("zh-CN", {
      maximumFractionDigits: 2,
    });
    if (size === undefined) {
      return "";
    }
    if (size >= this.GB) {
      return numberFormat.format(size / this.GB) + "G";
    }
    if (size >= this.MB) {
      return numberFormat.format(size / this.MB) + "M";
    }

    if (size >= this.KB) {
      return numberFormat.format(size / this.KB) + "k";
    }
    return size + "b";
  }

  private readonly KB = 1000;
  private readonly MB = 1000000;
  private readonly GB = 1000000000;
}

Reference

https://developer.huawei.com/consumer/cn/doc/harmonyos-guides-V5/i18n-numbers-weights-measures-V5#%E6%95%B0%E5%AD%97%E6%A0%BC%E5%BC%8F%E5%8C%96

发表几秒读完 (大约82个字)

鸿蒙-日期格式化输出(ArkTS)

DevEco Studio 版本：DevEco Studio NEXT Developer Preview2(4.1.3.700)
HarmonyOS API 版本：4.1.0(11)

日期格式化输出(ArkTS)

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// 时间戳转换为显示时间输出
function timestampToDate(t: number): string {
  let date = new Date(t);
  const year = date.getFullYear();
  const month = ("0" + (date.getMonth() + 1)).slice(-2);
  const day = ("0" + date.getDate()).slice(-2);
  const hours = ("0" + date.getHours()).slice(-2);
  const minutes = ("0" + date.getMinutes()).slice(-2);
  const seconds = ("0" + date.getSeconds()).slice(-2);
  return `${year}-${month}-${day} ${hours}:${minutes}:${seconds}`;
}
发表5 分钟读完 (大约744个字)

鸿蒙-HDC 常用命令

DevEco Studio 版本：DevEco Studio NEXT Developer Preview2(4.1.3.700)
HarmonyOS API 版本：4.1.0(11)

HDC 常用命令

0x01 全局相关命令

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# 显示hdc相关的帮助信息
hdc -h

# 显示hdc的版本信息
hdc -v

# 获取OTA系统版本号
hdc shell param get const.product.software.version

# 获取序列号(获取设备信息)
# 查询已连接的所有目标设备，添加-v选项，则会打印设备详细信息。
hdc list targets

# 交互命令，COMMAND表示需要执行的单次命令。不同类型或版本的系统支持的COMMAND命令有所差异，可以通过hdc shell ls /system/bin查阅支持的命令列表。
hdc shell
hdc shell ps -ef
hdc shell help -a // 查询全部可用命令

0x02 服务进程相关命令

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# 重启目标设备，查看目标列表可用list targets命令。
hdc target boot

# 终止hdc服务进程，使用-r参数触发服务进程重新启动。
hdc kill [-r]

# 启动hdc服务进程，使用-r参数触发服务进程重新启动。
hdc start [-r]

0x03 文件相关命令

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# 从本地发送文件至远端设备。
hdc file send E:\example.txt /data/local/tmp/example.txt

# 从远端设备发送文件至本地。
hdc file recv  /data/local/tmp/a.txt  ./a.txt

0x04 应用相关命令

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# 安装指定的应用package文件。
hdc install -r E:\com.example.hello.hap

# 卸载指定的应用包package包名。
hdc uninstall com.example.hello

# 显示可调试应用列表。
hdc jpid

hdc help

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                        OpenHarmony device connector(HDC) ...

---------------------------------global commands:----------------------------------
 -h/help [verbose]                     - Print hdc help, 'verbose' for more other cmds
 -v/version                            - Print hdc version
 -t connectkey                         - Use device with given connect key

---------------------------------component commands:-------------------------------
session commands(on server):
 list targets [-v]                     - List all devices status, -v for detail
 start [-r]                            - Start server. If with '-r', will be restart server
 kill [-r]                             - Kill server. If with '-r', will be restart server

service commands(on daemon):
 target mount                          - Set /system /vendor partition read-write
 target boot [-bootloader|-recovery]   - Reboot the device or boot into bootloader\recovery.
 target boot [MODE]                    - Reboot the into MODE.
 smode [-r]                            - Restart daemon with root permissions, '-r' to cancel root
                                         permissions
 tmode usb                             - Reboot the device, listening on USB
 tmode port [port]                     - Reboot the device, listening on TCP port

---------------------------------task commands:-------------------------------------
file commands:
 file send [option] local remote       - Send file to device
 file recv [option] remote local       - Recv file from device
                                         option is -a|-s|-z
                                         -a: hold target file timestamp
                                         -sync: just update newer file
                                         -z: compress transfer
                                         -m: mode sync

forward commands:
 fport localnode remotenode            - Forward local traffic to remote device
 rport remotenode localnode            - Reserve remote traffic to local host
                                         node config name format 'schema:content'
                                         examples are below:
                                         tcp:<port>
                                         localfilesystem:<unix domain socket name>
                                         localreserved:<unix domain socket name>
                                         localabstract:<unix domain socket name>
                                         dev:<device name>
                                         jdwp:<pid> (remote only)
 fport ls                              - Display forward/reverse tasks
 fport rm taskstr                      - Remove forward/reverse task by taskstring

app commands:
 install [-r|-s] src                   - Send package(s) to device and install them
                                         src examples: single or multiple packages and directories
                                         (.hap .hsp)
                                         -r: replace existing application
                                         -s: install shared bundle for multi-apps
 uninstall [-k] [-s] package           - Remove application package from device
                                         -k: keep the data and cache directories
                                         -s: remove shared bundle

debug commands:
 hilog [-h]                            - Show device log, -h for detail
 shell [COMMAND...]                    - Run shell command (interactive shell if no command given)
 bugreport [FILE]                      - Return all information from the device, stored in file if FILE is specified
 jpid                                  - List pids of processes hosting a JDWP transport

security commands:
 keygen FILE                           - Generate public/private key; key stored in FILE and FILE.pub

参考

HarmonyOS NEXT Developer：https://developer.huawei.com/consumer/cn/doc/harmonyos-guides-V5/hdc-V5

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