如何在 Android 中以自定义文件名保存相机拍摄的图像?

How to save camera captured image with custom file name in Android?

我正在尝试用 Android 中的相机拍照,我想使用 UUID 使用自定义文件名保存它(例如:f12b5700-1d92-11e9-ab14-d663bd873d93.jpg) .

在下面的代码中,在 onActivityResult 中,我确实在 photoPath 中得到了 f12b5700-1d92-11e9-ab14-d663bd873d93.jpg 但是当我检查设备上的实际图像,它被保存为 timestamp.jpg(例如:1548082653944.jpg)。我的问题是如何让图片以自定义名称保存?

private var photoURI: Uri? = null
private fun takePhoto()
    {
        val values = ContentValues()
        values.put(MediaStore.Images.Media.TITLE, UUID.randomUUID().toString() + ".jpg")

        photoURI = contentResolver.insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values)

        val intent = Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        if (intent.resolveActivity(packageManager) != null)
        {
            intent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI)
            startActivityForResult(intent, PHOTO_REQUEST_CODE);
        }
    }

在 onActivityResult 处理程序中,代码如下所示:

if (requestCode == PHOTO_REQUEST_CODE)
{
    if (resultCode == Activity.RESULT_OK)
    {
        val proj = arrayOf(MediaStore.Images.Media.TITLE)

        val cursor = contentResolver.query(photoURI!!, proj, null, null, null)
        val index = cursor!!.getColumnIndex(MediaStore.Images.Media.TITLE)

        cursor.moveToFirst()
        photoPath = cursor.getString(index)
        cursor.close()

         Toast.makeText(this, photoPath, Toast.LENGTH_LONG).show()
    }
    else
    {
        capturedImage.setImageURI(null)
        Toast.makeText(this, "Photo was not taken", Toast.LENGTH_SHORT).show()
    }
}

经过一些努力,我在 CommonsWare 的帮助下解决了这个问题 link: https://github.com/commonsguy/cw-omnibus/tree/v8.13/Camera/FileProvider

此外,我还从这些 link 中得到了帮助:

https://guides.codepath.com/android/Accessing-the-Camera-and-Stored-Media

https://guides.codepath.com/android/Sharing-Content-with-Intents#sharing-files-with-api-24-or-higher

https://developer.android.com/training/camera/photobasics

https://developer.android.com/reference/android/os/Environment.html#getExternalStorageState(java.io.File)

诀窍是使用 FileProvider。 我必须在 AndroidManifest.xml

中添加 <provider>

工作代码如下所示:

if (Environment.getExternalStorageState() != Environment.MEDIA_MOUNTED)
        {
            Toast.makeText(this, "Storage is not available", Toast.LENGTH_LONG).show()
            return
        }

        var imageName = UUID.randomUUID().toString() + ".jpg"
        var output = File(Environment.getExternalStoragePublicDirectory(appName), imageName)


        if (!output.parentFile.exists() && !output.parentFile.mkdir())
        {
            Toast.makeText(this, "Unable to create storage folder", Toast.LENGTH_LONG).show()
            return
        }

        photoURI = FileProvider.getUriForFile(this, authority, output)

        val intent = Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        if (intent.resolveActivity(packageManager) != null)
        {
            intent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI)
            startActivityForResult(intent, PHOTO_REQUEST_CODE);
        }

提供商:

<provider
    android:authorities="com.domain.appname.fileprovider"
    android:name="android.support.v4.content.FileProvider"
    android:exported="false"
    android:grantUriPermissions="true">
    <meta-data
    android:name="android.support.FILE_PROVIDER_PATHS"
    android:resource="@xml/file_paths"/>
</provider>

file_paths.xml:

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <external-path name="appname" path="appname" />
</paths>

相应地更改 com.domain.appname 和应用程序名称。