Qt报错The API level set for the APK is less than the minimum required by the kit. The minimum API level required by the kit is 21. Error while building/deploying project Android-DM16S (kit: Android for armeabi-v7a,arm64-v8a,x86,x86_64 (Clang Qt 5.14.2 for Android)) When executing step "Build Android APK"

这个错误提示表示您的 Qt 项目使用的 Android Kit 要求最低 API 级别为 21，但您的项目设置的 APK API 级别低于 21，因此无法构建和部署。

要解决此问题，请按照以下步骤更新您的项目设置：

1. 打开 Qt 项目中的 AndroidManifest.xml 文件。
2. 在文件中找到 `android:minSdkVersion` 和 `android:targetSdkVersion` 属性。
3. 确保 `android:minSdkVersion` 和 `android:targetSdkVersion` 属性的值都至少为 21。
4. 保存文件并重新构建和部署您的项目。

如果这个步骤没有解决问题，您还可以尝试以下几个步骤：

1. 确保您的 Android SDK 安装完整，并且已经安装了 API 级别为 21 的所有组件。
2. 检查您的 Qt 安装是否正确，并且已经安装了 Android 支持组件。
3. 确保您的 Android Kit 配置正确，并且已经正确连接到您的 Android SDK。

如果您仍然遇到问题，请尝试在 Qt Creator 中使用不同的 Android Kit，并且确保您的项目设置正确。

相关问题

qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in

This error message usually occurs when the required Qt platform plugin "xcb" is not found or cannot be loaded. "xcb" is the X Window System backend used by Qt for rendering graphical user interfaces.

To resolve this issue, you can try the following steps:

1. Install the necessary dependencies: Make sure that you have all the required dependencies installed for running Qt applications with the XCB platform plugin. On most Linux distributions, you can install these dependencies using the package manager. For example, on Ubuntu, you can run the following command:

   sudo apt-get install libxcb-xinerama0

2. Verify the plugin installation: Check if the "xcb" platform plugin is available in the plugins/platforms directory of your Qt installation. The exact path may vary depending on your system and Qt version, but it is typically located in a directory like "Qt/5.X.Y/gcc_64/plugins/platforms". If the "xcb" plugin is missing, you may need to reinstall Qt or compile it with support for the XCB platform plugin.

3. Set the correct environment variable: Ensure that the environment variable `QT_QPA_PLATFORM_PLUGIN_PATH` is set correctly. This variable should point to the directory containing the Qt platform plugins. You can set it in your application's startup script or in your system's environment variables. For example, on Linux, you can run the following command to set the variable temporarily for testing:

   export QT_QPA_PLATFORM_PLUGIN_PATH=/path/to/qt/plugins/platforms

4. Check library paths: Make sure that the required Qt libraries and plugins are present in the system's library search path. You can verify this by running the `ldd` command on your application binary and checking if all the Qt dependencies are resolved correctly.

By following these steps, you should be able to resolve the "Could not load the Qt platform plugin" error and successfully run your Qt application with the XCB platform plugin.

qt.qpa.plugin: Could not find the Qt platform plugin wayland in

"qt.qpa.plugin: Could not find the Qt platform plugin wayland in" 是一个错误消息，它表示在使用Qt框架时，无法找到名为wayland的Qt平台插件。Wayland是一种用于显示服务器的协议，它允许图形应用程序与显示服务器进行通信。

这个错误通常发生在以下情况下：
1. 缺少wayland插件：可能是因为Qt库中没有包含wayland插件，或者插件文件丢失或损坏。
2. 环境变量设置错误：可能是由于环境变量设置不正确导致Qt无法找到wayland插件。

要解决这个问题，你可以尝试以下几个步骤：
1. 确保你的Qt库中包含了wayland插件。可以通过检查Qt安装目录下的plugins/platforms文件夹来确认。
2. 检查环境变量是否正确设置。确保QT_QPA_PLATFORM环境变量设置为wayland。
3. 如果你使用的是Linux系统，确保已经安装了wayland显示服务器，并且相关的依赖项也已经安装。

如果以上步骤都没有解决问题，你可以尝试重新安装Qt库或者更新到最新版本的Qt库。