修改模式切换流程

app/src/main/java/com/sw/dualscreen/utils/BitmapSaver.kt

@@ -29,7 +29,8 @@ object BitmapSaver {
         format: Bitmap.CompressFormat = Bitmap.CompressFormat.JPEG,
         quality: Int = 100
     ): File? {
-        val dir = context.getExternalFilesDir(null)
+        //val dir = context.getExternalFilesDir(null)
+        val dir = context.cacheDir
         return saveBitmap(bitmap, File(dir, fileName), format, quality)
     }
 

app/src/main/java/com/sw/dualscreen/utils/CameraUtils.kt

@@ -0,0 +1,81 @@
+package com.sw.dualscreen.utils
+
+import android.net.Uri
+import androidx.activity.ComponentActivity
+import androidx.camera.core.CameraSelector
+import androidx.camera.view.CameraController
+import androidx.camera.view.LifecycleCameraController
+import androidx.camera.view.PreviewView
+
+class CameraUtils(private var activity: ComponentActivity) {
+
+    private var cameraController: LifecycleCameraController? = null
+    private var photoCaptureHelper: PhotoCaptureHelper? = null
+
+    //    private var isCameraReady = false
+    fun takePhoto(callback: (Uri) -> Unit) {
+        cameraController?.let {
+            if (photoCaptureHelper == null) {
+                initCaptureHelper()
+            }
+        }
+        photoCaptureHelper?.let {
+            it.addSuccessCallback(callback)
+            it.bindCameraCallback {
+                bind()
+            }
+            it.takePhoto()
+        }
+    }
+
+    private fun initCaptureHelper() {
+        photoCaptureHelper = PhotoCaptureHelper(
+            context = activity,
+            cameraController = cameraController!!,
+            onSuccess = {},
+            onError = { msg ->
+                //toast(msg)
+            }
+        )
+    }
+
+    fun setPreviewController(previewView: PreviewView?) {
+        if (previewView?.controller == null) {
+            previewView?.controller = cameraController
+        }
+    }
+
+    fun initCamera() {
+        if (cameraController == null) {
+            cameraController = LifecycleCameraController(activity).apply {
+                // 必须设置有效的用例
+                setEnabledUseCases(
+                    CameraController.IMAGE_CAPTURE
+                    // or CameraController.VIDEO_CAPTURE
+                )
+                cameraSelector = CameraSelector.DEFAULT_BACK_CAMERA
+            }
+            bind()
+        }
+
+//        if (isCameraReady.not()) {
+//            try {
+//                cameraController!!.initializationFuture.addListener({
+//                    isCameraReady = true
+//                    Timber.d("Camera initialized successfully")
+//                }, ContextCompat.getMainExecutor(this))
+//            } catch (e: Exception) {
+//                Timber.d("Camera initialized error = ${e.message}")
+//            }
+//        }
+    }
+
+    fun bind() {
+        cameraController?.bindToLifecycle(activity)
+    }
+
+    fun unbind() {
+        cameraController?.unbind()
+    }
+
+}

app/src/main/java/com/sw/dualscreen/utils/PhotoCaptureHelper.kt

@@ -0,0 +1,92 @@
+package com.sw.dualscreen.utils
+
+import android.content.Context
+import android.net.Uri
+import androidx.camera.core.ImageCapture
+import androidx.camera.core.ImageCaptureException
+import androidx.camera.view.CameraController
+import androidx.core.content.ContextCompat
+import timber.log.Timber
+import java.io.File
+
+/**
+ * 拍照工具类
+ * @param context Context 上下文
+ * @param cameraController CameraController 相机控制器
+ * @param onSuccess (Uri) -> Unit 拍照成功回调
+ * @param onError (String) -> Unit 拍照失败回调
+ */
+class PhotoCaptureHelper(
+    private val context: Context,
+    private val cameraController: CameraController,
+    private val onSuccess: (Uri) -> Unit = {},
+    private val onError: (String) -> Unit = {}
+) {
+    private val callbackList: MutableList<(Uri) -> Unit> = mutableListOf()
+    fun addSuccessCallback(callback:(Uri) -> Unit) {
+        if (callbackList.contains(callback).not()) {
+            callbackList.add(callback)
+        }
+    }
+
+    private var bindCamera:(()->Unit)?=null
+    fun bindCameraCallback(callback:()->Unit) {
+        this.bindCamera = callback
+    }
+
+    /**
+     * 拍照方法
+     * @param fileNamePrefix 文件名前缀，默认为"IMG_"
+     * @param fileExtension 文件扩展名，默认为".jpg"
+     */
+    fun takePhoto(
+        fileNamePrefix: String = "IMG_",
+        fileExtension: String = ".jpg"
+    ) {
+        Timber.d("开始拍照采集")
+
+        try {
+            val executor = ContextCompat.getMainExecutor(context)
+            val cacheDir = context.cacheDir
+            val photoFile = File.createTempFile(
+                "${fileNamePrefix}${System.currentTimeMillis()}",
+                fileExtension,
+                cacheDir
+            )
+
+            val outputOptions = ImageCapture.OutputFileOptions.Builder(photoFile).build()
+
+            cameraController.takePicture(
+                outputOptions,
+                executor,
+                object : ImageCapture.OnImageSavedCallback {
+                    override fun onImageSaved(outputFileResults: ImageCapture.OutputFileResults) {
+                        val photoUri = outputFileResults.savedUri ?: Uri.fromFile(photoFile)
+                        Timber.d("照片保存成功: $photoUri")
+                        onSuccess(photoUri)
+                        callbackList.forEach {
+                            it(photoUri)
+                        }
+                    }
+
+                    override fun onError(exception: ImageCaptureException) {
+                        val errorMsg = "拍照失败: ${exception.message}"
+                        if (errorMsg.contains("Not bound to a valid Camera")) {
+                            if (bindCamera != null) {
+                                bindCamera?.invoke()
+                                //takePhoto()
+                            }
+
+                        }
+                        Timber.e(exception, errorMsg)
+                        onError(errorMsg)
+                    }
+                }
+            )
+        } catch (e: Exception) {
+            val errorMsg = "创建临时文件失败: ${e.message}"
+            Timber.e(e, errorMsg)
+            onError(errorMsg)
+        }
+    }
+}