68 lines
2.3 KiB
Kotlin
68 lines
2.3 KiB
Kotlin
package com.sw.dualscreen.utils
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import android.content.Context
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import android.net.Uri
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import android.provider.OpenableColumns
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import android.widget.Toast
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import androidx.activity.result.ActivityResultCaller
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import androidx.activity.result.ActivityResultLauncher
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import androidx.activity.result.contract.ActivityResultContracts
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import androidx.core.content.FileProvider
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import java.io.File
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import java.io.FileOutputStream
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/**
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* 简洁相机工具类
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* 调用系统相机拍照并返回照片路径
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*/
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class CameraHelper(
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private val context: Context,
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caller: ActivityResultCaller,
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private val authority: String,
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private val onResult: (uri: Uri, filePath: String?) -> Unit
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) {
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private lateinit var imageUri: Uri
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private val takePictureLauncher: ActivityResultLauncher<Uri>
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init {
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takePictureLauncher =
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caller.registerForActivityResult(ActivityResultContracts.TakePicture()) { success ->
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if (success) {
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val path = getRealPathFromUri(context, imageUri)
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onResult(imageUri, path)
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} else {
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Toast.makeText(context, "拍照取消", Toast.LENGTH_SHORT).show()
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}
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}
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}
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/** 打开系统相机 */
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fun openCamera() {
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// 1. 创建存储图片的文件
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val photoFile = File(context.externalCacheDir, "IMG_${System.currentTimeMillis()}.jpg")
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photoFile.parentFile?.mkdirs() // 确保目录存在
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// 2. 生成 content:// Uri
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imageUri = FileProvider.getUriForFile(context, authority, photoFile)
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// 3. 启动相机
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takePictureLauncher.launch(imageUri)
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}
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/** 可选：将 content:// 转为实际路径 */
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private fun getRealPathFromUri(context: Context, uri: Uri): String? {
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var filePath: String? = null
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context.contentResolver.query(uri, null, null, null, null)?.use { cursor ->
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val nameIndex = cursor.getColumnIndex(OpenableColumns.DISPLAY_NAME)
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cursor.moveToFirst()
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val fileName = cursor.getString(nameIndex)
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val file = File(context.cacheDir, fileName)
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context.contentResolver.openInputStream(uri)?.use { input ->
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FileOutputStream(file).use { output -> input.copyTo(output) }
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}
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filePath = file.absolutePath
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}
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return filePath
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}
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} |