Android's thinking about camera use

1. Camera use

需要以下变量：
MediaStore.ACTION_IMAGE_CAPTURE
imgURI
file

具体参考：https://blog.csdn.net/hehe26/article/details/52921056?utm_source=blogxgwz38

2. Stream conversion (byte[] -> bitmap)

需要变量：
imgURI
InputStream-读出
ByteArrayOutputStream-写入

具体参考：https://www.cnblogs.com/yourancao520/archive/2012/06/25/2561367.html

3. Some problems

3.1 Return data as null

具体参考：startActivityForResult设置了Extra，设置URI会导致data返回null。不传URI则可以返回data。

3.2 Permission application

具体参考：Manifest.permission.CAMERA

3.3 Path setting

具体参考:fileProvider使用，涉及到meta-data标签
Refer to the following settings:

// Manifest.xml
<provider
    android:authorities="${applicationId}.fileprovider"
    android:name="androidx.core.content.FileProvider"
    android:exported="false"
    android:grantUriPermissions="true">
    <meta-data
        android:name="android.support.FILE_PROVIDER_PATHS"
        android:resource="@xml/file_paths"/>
</provider>

//xml/file_paths.xml由于安全机制，所以需要（Android10）
<paths>
    <cache-path
        name="my_imgs_cache"
        path="." />
</paths>

When setting, note that you can use different tags according to the path:

4. Reference suggestions

1. 《第一行代码》——
2. https://blog.csdn.net/hehe26/article/details/52921056?utm_source=blogxgwz38
3. https://blog.csdn.net/u014038534/article/details/52895686/
4. https://www.cnblogs.com/yourancao520/archive/2012/06/25/2561367.html

The predecessors planted trees, and the descendants took the shade.