REFACTOR PROJECT

app/src/main/java/com/binbin/androidowner/Utils.kt

@@ -0,0 +1,26 @@
+package com.binbin.androidowner
+
+import android.content.Context
+import android.net.Uri
+import android.widget.Toast
+import java.io.FileNotFoundException
+import java.io.IOException
+import java.io.InputStream
+
+
+fun uriToStream(
+    context: Context,
+    uri: Uri?,
+    operation:(stream: InputStream)->Unit
+){
+    if(uri!=null){
+        try{
+            val stream = context.contentResolver.openInputStream(uri)
+            if(stream!=null) { operation(stream) }
+            else{ Toast.makeText(context, "空的流", Toast.LENGTH_SHORT).show() }
+            stream?.close()
+        }
+        catch(e: FileNotFoundException){ Toast.makeText(context, "文件不存在", Toast.LENGTH_SHORT).show() }
+        catch(e: IOException){ Toast.makeText(context, "IO异常", Toast.LENGTH_SHORT).show() }
+    }else{ Toast.makeText(context, "空URI", Toast.LENGTH_SHORT).show() }
+}