使用Android CameraX庫進行圖像裁剪非常簡單。首先，確保您已經在項目中添加了CameraX庫的依賴項。然后，您可以按照以下步驟實現圖像裁剪：

1. 添加依賴項

在項目的build.gradle文件中添加以下依賴項：

dependencies {
    implementation 'androidx.camera:camera-core:1.0.0'
    implementation 'androidx.camera:camera-camera2:1.0.0'
    implementation 'androidx.camera:camera-lifecycle:1.0.0'
    implementation 'androidx.camera:camera-view:1.0.0'
    implementation 'androidx.camera:camera-extensions:1.0.0'
    implementation 'com.google.android.material:material:1.0.0'
}

2. 請求權限

確保您的應用具有訪問相機和存儲的權限。在AndroidManifest.xml文件中添加以下權限：

<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

在運行時請求相機和存儲權限。可以使用以下代碼片段：

private fun requestPermissions() {
    ActivityCompat.requestPermissions(this, arrayOf(Manifest.permission.CAMERA, Manifest.permission.WRITE_EXTERNAL_STORAGE), REQUEST_CODE)
}

override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<out String>, grantResults: IntArray) {
    when (requestCode) {
        REQUEST_CODE -> {
            if (grantResults.isNotEmpty() && grantResults[0] == PackageManager.PERMISSION_GRANTED && grantResults[1] == PackageManager.PERMISSION_GRANTED) {
                // Permissions granted, proceed with camera and storage operations
            } else {
                // Permissions denied, show a message to the user
            }
        }
    }
}

3. 創建裁剪意圖

創建一個裁剪意圖并設置參數，如下所示：

private fun createCropIntent(imageUri: Uri): Intent {
    val cropIntent = Intent("com.android.camera.action.CROP")
    cropIntent.setDataAndType(imageUri, "image/*")
    cropIntent.putExtra("crop", "true")
    cropIntent.putExtra("outputX", 200)
    cropIntent.putExtra("outputY", 200)
    cropIntent.putExtra("aspectX", 1)
    cropIntent.putExtra("aspectY", 1)
    cropIntent.putExtra("scale", true)
    cropIntent.putExtra("return-data", true)
    return cropIntent
}

4. 啟動裁剪活動

使用以下代碼啟動裁剪活動并獲取裁剪后的圖像數據：

private fun startCropActivity(imageUri: Uri) {
    val cropIntent = createCropIntent(imageUri)
    startActivityForResult(cropIntent, REQUEST_CROP_IMAGE)
}

override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
    super.onActivityResult(requestCode, resultCode, data)
    if (requestCode == REQUEST_CROP_IMAGE && resultCode == Activity.RESULT_OK && data != null) {
        val dataUri = data.data
        // Handle the cropped image, e.g., save it to your storage or display it in an ImageView
    }
}

現在，當您調用startCropActivity(imageUri)時，應用將啟動裁剪活動并返回裁剪后的圖像數據。您可以使用onActivityResult方法處理裁剪后的圖像，例如將其保存到存儲或顯示在ImageView中。