1、滑动监听功能开发完成，解决空引用BUG

2、增加文件管理模块，包括通过文件路径解析文件名称、路径、大小及大小的格式化

app/src/main/java/com/cr/common/CrFileManager.kt

@@ -40,7 +40,7 @@ class CrFileManager {
          * @param fileSize
          * @return
          */
-        fun FileSizeToString(fileSize: Long): String? {
+        fun fileSizeToString(fileSize: Long): String? {
             return if (fileSize < 1000) {
                 String.format("%s b", fileSize)
             } else if (fileSize < 1000 * 1000) {
@@ -57,6 +57,16 @@ class CrFileManager {
         }
 
         /**
+         * 获取文件的大小
+         * @param fileAllPath String 文件路径
+         * @return Long 文件大小
+         */
+        fun getFileSize(fileAllPath:String):Long{
+            var file = File(fileAllPath)
+            return file.length()
+        }
+
+        /**
          * 截取文件名称含扩展名
          * @param fileAllPath 文件全路径
          * @return 含扩展名的文件名

app/src/main/java/com/cr/pages/FragmentUploadCaseMain.kt

@@ -84,6 +84,16 @@ class FragmentUploadCaseMain : CrNavigationFragment(), View.OnClickListener {
             btnUpload?.setOnClickListener(this)
 
             imageBrowser = it.findViewById(R.id.case_image_browser)
+            imageBrowser?.crSetListener(imageBrowserListener)
+        }
+    }
+
+    // todo: 2023/6/17 滑动监听
+    private val imageBrowserListener = object :CrImageBrowserWidget.iChangeListener{
+        // todo: 2023/6/17 滑动监听
+        override fun onChange(file: CrImageBrowserWidget.ImageFileModel?) {
+            lblCaseMediaName?.text = file?.fileName
+            lblCaseMediaSize?.text = file?.fileSizeDescription
         }
     }
 

app/src/main/java/com/cr/widget/CrImageBrowserWidget.kt

@@ -9,9 +9,10 @@ import android.view.ViewGroup
 import android.widget.ImageView
 import androidx.recyclerview.widget.RecyclerView
 import androidx.viewpager2.widget.ViewPager2
+import androidx.viewpager2.widget.ViewPager2.OnPageChangeCallback
+import com.cr.common.CrFileManager
 import com.cr.cruav.R
 import com.cr.data.CrUtil
-import okhttp3.internal.notify
 import java.io.FileInputStream
 import java.io.FileNotFoundException
 
@@ -21,14 +22,20 @@ import java.io.FileNotFoundException
  * 创建日期：2023/6/16 16:19
  * 描述：图片浏览器
  */
-class CrImageBrowserWidget@JvmOverloads constructor(
+class CrImageBrowserWidget @JvmOverloads constructor(
     context: Context,
-    attrs: AttributeSet?=null,
+    attrs: AttributeSet? = null,
     defStyleAttr: Int = 0
-) :CrConstraintLayoutWidget(context,attrs,defStyleAttr){
-    private var viewPager:ViewPager2?= null // define: 2023/6/16 页面滑动组件
-    private var dataList:MutableList<String> = mutableListOf() // define: 2023/6/16 数据集合
-    private var adapter:BaseAdapter?= null // define: 2023/6/16 适配器
+) : CrConstraintLayoutWidget(context, attrs, defStyleAttr) {
+    private var viewPager: ViewPager2? = null // define: 2023/6/16 页面滑动组件
+    private var dataList: MutableList<String> = mutableListOf() // define: 2023/6/16 数据集合
+    private var adapter: BaseAdapter? = null // define: 2023/6/16 适配器
+    private var listener:iChangeListener?=null // define: 2023/6/17 对外接口
+
+    // todo: 2023/6/17 对外接口
+    interface iChangeListener{
+        fun onChange(file:ImageFileModel?)
+    }
 
     /**
      * 初始化
@@ -48,6 +55,21 @@ class CrImageBrowserWidget@JvmOverloads constructor(
         // todo: 2023/6/16 设置适配器
         adapter = BaseAdapter(dataList)
         viewPager?.adapter = adapter
+        // todo: 2023/6/17 设置监听
+//        viewPager?.registerOnPageChangeCallback(pageChangeListener)
+    }
+
+    /**
+     * 页面滑动监听
+     */
+    private var pageChangeListener = object:OnPageChangeCallback(){
+        // todo: 2023/6/17 选择页面
+        override fun onPageSelected(position: Int) {
+            var fileModel = adapter?.crGetSelectItem(position)
+            if(fileModel != null){
+                if(listener != null) listener?.onChange(fileModel)
+            }
+        }
     }
 
     /**
@@ -55,15 +77,17 @@ class CrImageBrowserWidget@JvmOverloads constructor(
      * @property dataList List<String>?
      * @constructor
      */
-    internal class BaseAdapter(dataList:List<String>):RecyclerView.Adapter<BaseAdapter.BaseViewHolder?>(){
-        var dataList:List<String>? = null // define: 2023/6/16 数据集合
-
+    internal class BaseAdapter(dataList: MutableList<String>) :
+        RecyclerView.Adapter<BaseAdapter.BaseViewHolder?>() {
+        private var dataList: MutableList<String>? = mutableListOf() // define: 2023/6/16 数据集合
+        private var fileList:MutableList<ImageFileModel>?= mutableListOf()  // define: 2023/6/17 文件集合
         // todo: 2023/6/16 创建视图
         override fun onCreateViewHolder(
             parent: ViewGroup,
             viewType: Int
         ): BaseAdapter.BaseViewHolder {
-            var itemView:View = LayoutInflater.from(parent.context).inflate(R.layout.item_image,parent,false)
+            var itemView: View =
+                LayoutInflater.from(parent.context).inflate(R.layout.item_image, parent, false)
             return BaseViewHolder(itemView)
         }
 
@@ -74,7 +98,7 @@ class CrImageBrowserWidget@JvmOverloads constructor(
                 var fis = FileInputStream(imagePath)
                 var bitmap = BitmapFactory.decodeStream(fis)
                 holder.imageView?.setImageBitmap(bitmap)
-            }catch (ex:FileNotFoundException){
+            } catch (ex: FileNotFoundException) {
                 CrUtil.print("加载图片错误：" + ex.message)
             }
         }
@@ -84,8 +108,8 @@ class CrImageBrowserWidget@JvmOverloads constructor(
             return dataList!!.size
         }
 
-        inner class BaseViewHolder(itemView: View):RecyclerView.ViewHolder(itemView){
-            var imageView:ImageView?= null  // define: 2023/6/16 图片展示控件
+        inner class BaseViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
+            var imageView: ImageView? = null  // define: 2023/6/16 图片展示控件
 
             /**
              * 初始化
@@ -100,24 +124,82 @@ class CrImageBrowserWidget@JvmOverloads constructor(
          */
         init {
             this.dataList = dataList
+            initFileList()
+        }
+
+        /**
+         * 文件初始化
+         */
+        private fun initFileList(){
+            this.fileList?.let {
+                it.clear()
+                for(filePath in this.dataList!!){
+                    var model = ImageFileModel(filePath)
+                    it.add(model)
+                }
+            }
         }
 
         /**
          * 更新数据
          * @param dataList List<String>
          */
-        fun update(dataList: List<String>){
+        fun crUpdate(dataList: MutableList<String>) {
             this.dataList = dataList
+            initFileList()
             notifyDataSetChanged()
         }
+
+        /**
+         * 返回当前位置的文件模型
+         * @param position Int 位置
+         * @return ImageFileModel? 信息
+         */
+        fun crGetSelectItem(position:Int):ImageFileModel?{
+            return this.fileList?.get(position)
+        }
+
+    }
+
+    // todo: 2023/6/17 照片模型
+    class ImageFileModel {
+        var fileName: String? = null // define: 2023/6/17 图片名称
+        var fileSize: Long? = 0 // define: 2023/6/17 图片大小
+        var fileSizeDescription: String? = null // define: 2023/6/17 图片大小描述
+        var fileFullPath: String? = null  // define: 2023/6/17 文件路径
+
+        /**
+         * 初始化
+         * @param filePth String 文件路径
+         * @constructor
+         */
+        constructor(filePth: String) {
+            this.fileFullPath = filePth
+            this.fileName = CrFileManager.getFileName(filePth)
+            this.fileSize = CrFileManager.getFileSize(filePth)
+            this.fileSizeDescription = CrFileManager.fileSizeToString(this.fileSize!!)
+        }
     }
 
     /**
      * 添加图片
      * @param imagePath String 图片路径
      */
-    fun crAppendImage(imagePath:String){
+    fun crAppendImage(imagePath: String) {
         this.dataList.add(imagePath)
-        adapter?.update(this.dataList)
+        adapter?.crUpdate(this.dataList)
+        // todo: 2023/6/17 追加了一条数据后注册监听
+        if(this.dataList.size == 1){
+            viewPager?.registerOnPageChangeCallback(pageChangeListener)
+        }
+        viewPager?.currentItem = this.dataList.size-1
+    }
+
+    /**
+     * 设置监听
+     * @param listener iChangeListener 监听
+     */
+    fun crSetListener(listener:iChangeListener){
+        this.listener = listener
     }
 }