GridView继承自BoxScrollView，BoxScrollView继承自ScrollView
GridView有多种构建函数
GridView
GridView.builder
GridView.count
GridView.custom
GridView.extent
Flutter记录之GridView
分类：Uncategorized
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1月 092024
3月 302023
将长度为10位的时间戳（秒级）转换为时间：
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select cast(datetime(logtime, 'unixepoch', 'localtime') as text),logcontent from logs |
将长度为13位的时间戳（毫秒级）转换为时间(秒级)：
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select cast(datetime(logtime/1000, 'unixepoch', 'localtime') as text),logcontent from logs |
将长度为13位的时间戳（毫秒级）转换为时间（毫秒级）：
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select cast(datetime(logtime/1000, 'unixepoch', 'localtime') as text)||'.'||cast(logtime%1000 as text),logcontent from logs |
1月 122023
执行yarn android出现如下错误
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yarn : 无法加载文件 d:\nodejs\yarn.ps1，因为在此系统上禁止运行脚本。有关详细信息，请参阅 https:/go.microsoft.com/fwlink/?LinkID=135170 中的 about_Execution_Policies。 所在位置 行:1 字符: 1 + yarn android + ~~~~ + CategoryInfo : SecurityError: (:) []，PSSecurityException + FullyQualifiedErrorId : UnauthorizedAccess |
解决办法：
- 打开“开始”菜单，搜索powershell，在powershell菜单上右键，点击“以管理员身份运行”
- 在打开的powershell命令行窗口中输入get-ExecutionPolicy，可以查看返回的是Restricted，这个意思是管理员权限是禁用的
- 在命令行窗口中输入set-ExecutionPolicy remotesigned，按照提示输入y，回车，就可以执行yarn相关命令了
Android Studio编译报:app:checkDebugManifest错误的解决办法
分类：Uncategorized
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1月 112023
将项目的原来的gradle版本由5.1.1升级到7.2版本后再编译就报如下错误
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FAILURE: Build completed with 5 failures. 1: Task failed with an exception. ----------- * What went wrong: A problem was found with the configuration of task ':app:checkDebugManifest' (type 'CheckManifest'). - In plugin 'com.android.build.gradle.api.AndroidBasePlugin' type 'com.android.build.gradle.internal.tasks.CheckManifest' property 'manifest' has @Input annotation used on property of type 'File'. Reason: A property of type 'File' annotated with @Input cannot determine how to interpret the file. Possible solutions: 1. Annotate with @InputFile for regular files. 2. Annotate with @InputDirectory for directories. 3. If you want to track the path, return File.absolutePath as a String and keep @Input. Please refer to https://docs.gradle.org/7.2/userguide/validation_problems.html#incorrect_use_of_input_annotation for more details about this problem. * Try: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights. ============================================================================== 2: Task failed with an exception. ----------- * What went wrong: A problem was found with the configuration of task ':app:createDebugCompatibleScreenManifests' (type 'CompatibleScreensManifest'). - In plugin 'com.android.build.gradle.api.AndroidBasePlugin' type 'com.android.build.gradle.tasks.CompatibleScreensManifest' property 'outputScope' is missing an input or output annotation. Reason: A property without annotation isn't considered during up-to-date checking. Possible solutions: 1. Add an input or output annotation. 2. Mark it as @Internal. Please refer to https://docs.gradle.org/7.2/userguide/validation_problems.html#missing_annotation for more details about this problem. * Try: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights. ============================================================================== 3: Task failed with an exception. ----------- * What went wrong: A problem was found with the configuration of task ':app:compileDebugShaders' (type 'ShaderCompile'). - In plugin 'com.android.build.gradle.api.AndroidBasePlugin' type 'com.android.build.gradle.tasks.ShaderCompile' property 'sourceDir' is annotated with @InputFiles but missing a normalization strategy. Reason: If you don't declare the normalization, outputs can't be re-used between machines or locations on the same machine, therefore caching efficiency drops significantly. Possible solution: Declare the normalization strategy by annotating the property with either @PathSensitive, @Classpath or @CompileClasspath. Please refer to https://docs.gradle.org/7.2/userguide/validation_problems.html#missing_normalization_annotation for more details about this problem. * Try: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights. ============================================================================== 4: Task failed with an exception. ----------- * What went wrong: Some problems were found with the configuration of task ':app:signingConfigWriterDebug' (type 'SigningConfigWriterTask'). - In plugin 'com.android.build.gradle.api.AndroidBasePlugin' type 'com.android.build.gradle.internal.tasks.SigningConfigWriterTask' property 'signingConfig.name' is missing an input or output annotation. Reason: A property without annotation isn't considered during up-to-date checking. Possible solutions: 1. Add an input or output annotation. 2. Mark it as @Internal. Please refer to https://docs.gradle.org/7.2/userguide/validation_problems.html#missing_annotation for more details about this problem. - In plugin 'com.android.build.gradle.api.AndroidBasePlugin' type 'com.android.build.gradle.internal.tasks.SigningConfigWriterTask' property 'signingConfig.signingReady' is missing an input or output annotation. Reason: A property without annotation isn't considered during up-to-date checking. Possible solutions: 1. Add an input or output annotation. 2. Mark it as @Internal. Please refer to https://docs.gradle.org/7.2/userguide/validation_problems.html#missing_annotation for more details about this problem. - In plugin 'com.android.build.gradle.api.AndroidBasePlugin' type 'com.android.build.gradle.internal.tasks.SigningConfigWriterTask' property 'signingConfig.storeFile' is annotated with @InputFile but missing a normalization strategy. Reason: If you don't declare the normalization, outputs can't be re-used between machines or locations on the same machine, therefore caching efficiency drops significantly. Possible solution: Declare the normalization strategy by annotating the property with either @PathSensitive, @Classpath or @CompileClasspath. Please refer to https://docs.gradle.org/7.2/userguide/validation_problems.html#missing_normalization_annotation for more details about this problem. * Try: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights. ============================================================================== 5: Task failed with an exception. ----------- * What went wrong: Some problems were found with the configuration of task ':app:transformNativeLibsWithMergeJniLibsForDebug' (type 'TransformTask'). - In plugin 'com.android.build.gradle.api.AndroidBasePlugin' type 'com.android.build.gradle.internal.pipeline.TransformTask' property 'allSecondaryInputs' is private and annotated with @Internal. Reason: Annotations on private getters are ignored. Possible solutions: 1. Make the getter public. 2. Annotate the public version of the getter. Please refer to https://docs.gradle.org/7.2/userguide/validation_problems.html#private_getter_must_not_be_annotated for more details about this problem. - In plugin 'com.android.build.gradle.api.AndroidBasePlugin' type 'com.android.build.gradle.internal.pipeline.TransformTask' property 'logging' is missing an input or output annotation. Reason: A property without annotation isn't considered during up-to-date checking. Possible solutions: 1. Add an input or output annotation. 2. Mark it as @Internal. Please refer to https://docs.gradle.org/7.2/userguide/validation_problems.html#missing_annotation for more details about this problem. - In plugin 'com.android.build.gradle.api.AndroidBasePlugin' type 'com.android.build.gradle.internal.pipeline.TransformTask' property 'oldSecondaryInputs' is annotated with @InputFiles but missing a normalization strategy. Reason: If you don't declare the normalization, outputs can't be re-used between machines or locations on the same machine, therefore caching efficiency drops significantly. Possible solution: Declare the normalization strategy by annotating the property with either @PathSensitive, @Classpath or @CompileClasspath. Please refer to https://docs.gradle.org/7.2/userguide/validation_problems.html#missing_normalization_annotation for more details about this problem. - In plugin 'com.android.build.gradle.api.AndroidBasePlugin' type 'com.android.build.gradle.internal.pipeline.TransformTask' property 'path' is missing an input or output annotation. Reason: A property without annotation isn't considered during up-to-date checking. Possible solutions: 1. Add an input or output annotation. 2. Mark it as @Internal. Please refer to https://docs.gradle.org/7.2/userguide/validation_problems.html#missing_annotation for more details about this problem. - In plugin 'com.android.build.gradle.api.AndroidBasePlugin' type 'com.android.build.gradle.internal.pipeline.TransformTask' property 'temporaryDir' is missing an input or output annotation. Reason: A property without annotation isn't considered during up-to-date checking. Possible solutions: 1. Add an input or output annotation. 2. Mark it as @Internal. Please refer to https://docs.gradle.org/7.2/userguide/validation_problems.html#missing_annotation for more details about this problem. * Try: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights. ============================================================================== * Get more help at https://help.gradle.org Deprecated Gradle features were used in this build, making it incompatible with Gradle 8.0. You can use '--warning-mode all' to show the individual deprecation warnings and determine if they come from your own scripts or plugins. See https://docs.gradle.org/7.2/userguide/command_line_interface.html#sec:command_line_warnings BUILD FAILED in 7s |
网上搜索大部分说是把使用的gradle的版本降到原来的版本，但是因为ide升级原因？版本不能降
后来搜索到一个方法是把项目里的build.gradle中的gradle插件的版本升级一下，由原来的3.4.1版本升级到4.2.0再编译就好了
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buildscript { repositories { google() jcenter() } dependencies { classpath 'com.android.tools.build:gradle:4.2.0' //原来是3.4.1 } } allprojects { repositories { google() jcenter() } } task clean(type: Delete) { delete rootProject.buildDir } |
11月 162022
出现这个问题的原因是两个表的字符集不一致
解决方法有两个：
1. 在select的时候对字段进行转码，如下：
select os.*, ob.obulatitude, ob.obulongtitude from OBU_status os left join obudevices as ob on CONVERT(os.device_ID USING utf8) COLLATE utf8_unicode_ci=ob.obuhardware
其中CONVERT(os.device_ID USING utf8) COLLATE utf8_unicode_ci使用convert函数对字段进行了转码
2. 修改表的字符集
这个比较麻烦，如果是新项目没有问题，如果是已经在运行的项目，要考虑对其他地方是不是有影响
11月 112022
1. 已知三角形三边长度，计算面积
三边长度：a, b, c
半周长：p = (a + b + c) / 2
三角形面积：S = √[p(p-a)(p-b)(p-c)] =（1/4）√[(a+b+c)(a+b-c)(a+c-b)(b+c-a)]
2. 已知三角形各边长度，求其中某个顶点到对边的距离
三边长度：a, b, c，求a到bc边的距离ad
根据上面公式得出三角形面积，
由公式S = 1/2 (底 x 高)，则ad = 2*S / bc
3. 设三角形三边分别为a、b、c，内切圆半径为r，则三角形面积=(a+b+c)r/2
4. 已知三角形两边a，b，这两边夹角C，则S＝1/2 * absinC
8月 232022
使用subprocess的Popen函数创建了一个进程
使用Popen的kill和terminate函数都杀不掉这个进程
后来发现是因为Popen的时候使用了shell=True参数，如果不使用这个参数可以杀掉
后来百度找到了其他方法
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import psutil def kill(proc_pid): process = psutil.Process(proc_pid) for proc in process.children(recursive=True): proc.kill() process.kill() |
想要杀掉进程的时候使用这个kill参数并传入子进程的pid就可以了
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child = subprocess.Popen(['ping 192.168.1.10 -t'], shell=True, stdout=fileno, stderr=fileno) kill(child.pid) |
参考链接：http://www.dovov.com/shell-truepythonsubprocess.html
8月 232022
使用下面的代码读取mysql数据时出现TypeError: tuple indices must be integers or slices, not str错误
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conn = pymysql.connect(host=dbhost, user=dbuser, passwd=dbpasswd, db=dbname) while True: cur = conn.cursor() cur.execute("SELECT * from radardevices where status=1") row_headers = [x[0] for x in cur.description] rows = cur.fetchall() for row in rows: print(row["macaddress"]) cur.close() time.sleep(1) conn.close() |
获取cursor时未指定cursor类型，默认使用tuple类型返回，将cur = conn.cursor()这一行修改为如下就可以了
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cur = conn.cursor(cursor=pymysql.cursors.DictCursor) |
Laravel Unknown column ‘updated_at’ in ‘field list’
分类：PHP
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Laravel Unknown column ‘updated_at’ in ‘field list’已关闭评论
8月 092022
因为数据表不是通过Laravel的migration建的，所以没有updated_at字段
使用Model对象save的时候就会报上面的错误，解决方法就是在Model里增加const UPDATED_AT = null;，如下代码所示：
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<?php namespace App; use Illuminate\Database\Eloquent\Model; class AidEvent extends Model { const UPDATED_AT = null; const CREATED_AT = null; function getTable() { return "aidevents"; } } |
6月 282022
基本Android sdk28版本编写
一、方法
setMaxDuration(int max_duration_ms)
设置最大录像时长（单位：毫秒），需要在setOutFormat()之后prepare()之前调用。当录像时长达到这个时长，将触发MediaRecorder.OnInfoListener事件，事件的what参数为MEDIA_RECORDER_INFO_MAX_DURATION_REACHED，并且录像停止。停止动作是异步执行的，不能保证收到OnInfoListener时停止操作已完成。
setMaxFileSize(long max_filesize_bytes)
设置最大录像文件大小（单位：字节），需要在setOutFormat()之后prepare()之前调用。当录像时长达到这个时长，将触发MediaRecorder.OnInfoListener事件，事件的what参数为MEDIA_RECORDER_INFO_MAX_FILESIZE_REACHED，并且录像停止。停止动作是异步执行的，不能保证收到OnInfoListener时停止操作已完成。
setNextOutputFile(File file)
当setOutputFile或者setNextOutputFile所设置的输出文件达到最大文件尺寸时，使用此函数设置下一个输出文件。文件应该是可查找的（seekable）？当设置了next output file后，程序在调用mediarecorder.stop之前不要使用这个文件。程序应该在收到what参数为MEDIA_RECORDER_INFO_MAX_FILESIZE_APPROACHING的OnInfoListener事件之后，what参数为MEDIA_RECORDER_INFO_MAX_FILESIZE_REACHED的OnInfoListener之前调用setNextOutputFile函数。当收到what参数为MEDIA_RECORDER_INFO_NEXT_OUTPUT_FILE_STARTED的OnInfoListener事件后，此函数设置的文件才开始被录制。当之前设置的文件未被使用时，是不能设置新的输出文件的。当调用stop停止录像时，程序负责清理未使用的文件。
setPreviewDisplay(Surface sv)
设置一个Surface用于预览正在录制的视频。需要在prepare函数前调用此函数。
如果使用了setCamera(camera)，并且camera对象已经设置了surface，程序就不用再调用此函数设置surface了，如果使用了一个非null值的surface作为参数调用了此函数，camera的预览surface将被新设置的surface代替；如果根本没有调用此函数或者传入了一个为null的surface，media recorder不会改变camera的surface。