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I have searched over how to retrieve a file in Kotlin, and I found this code in Java. 

public void load(View v) { FileInputStream fis = null; try { fis = openFileInput(FILE_NAME); InputStreamReader isr = new InputStreamReader(fis); BufferedReader br = new BufferedReader(isr); StringBuilder sb = new StringBuilder(); String text; while ((text = br.readLine()) != null) { sb.append(text).append("\n"); } mEditText.setText(sb.toString()); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { if (fis != null) { try { fis.close(); } catch (IOException e) { e.printStackTrace(); } } } }

How to write this in Kotlin Language...? So far by myself, I have tried to convert it in Kotlin but there are still some errors on some lines (denoted by ). Please help me in solving these errors. 

var fis = File(FILE_NAME).inputStream //<ror>Unresolved reference File try { fis = openFileInput(FILE_NAME) var isr = InputStreamReader(fis) val br = BufferedReader(isr) val sb = StringBuilder() var text:List<String> = br.readLines() while ((text) != null) { //<ror> sb.append(text).append("\n") } mEditText?.text(sb.toString()) //<ror> } catch (e : FileNotFoundException) { e.printStackTrace() } catch (e : IOException) { e.printStackTrace() } finally { if (fis != null) { try { fis.close() } catch (e : IOException) { e.printStackTrace() } } }
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5 Answers 5

Reset to default
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File(FILE_NAME).readLines().fold(StringBuilder()){ builder, next -> builder.appendln(next) }.also { mEditText.setText(it.toString()) }
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My solution is:

var fis = File(FILE_NAME).inputStream() try { fis = openFileInput(FILE_NAME) val isr = InputStreamReader(fis) val br = BufferedReader(isr) val sb = StringBuilder() var lines = br.readLines() for (line in lines) { sb.append(line).append("\n") } mEditText?.setText(sb.toString()) } catch (e : FileNotFoundException) { e.printStackTrace() } catch (e : IOException) { e.printStackTrace() } finally { try { fis.close() } catch (e : IOException) { e.printStackTrace() } }

It looks like you have infinite loop there so I change it to for each loop to read all the lines from the InputStream

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Just paste your java code in Android Studio .kt file, It will suggest you to convert it into Kotlin. There you get 99% of the kotlin code. Then change some missing elements.

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i know... i did that already but it didn't work.... that's i posted my first question here ~
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Here is my solution:

fun load(v: View?) { var fis: FileInputStream? = null try { fis = openFileInput(FILE_NAME) val isr = InputStreamReader(fis) val br = BufferedReader(isr) val lines = br.readLines() val output = lines.joinToString("\n") mEditText.setText(output) } catch (e: FileNotFoundException) { e.printStackTrace() } catch (e: IOException) { e.printStackTrace() } finally { try { fis?.close() } catch (e: IOException) { e.printStackTrace() } } }
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fun void load(v: View) { try { openFileInput(FILE_NAME).use { fis -> val br = BufferedReader(InputStreamReader(fis)) var text: String? = null while(true) { text = br.readLine() ?: break sb.append(text).append("\n") } editText.setText(sb.toString()) } } catch(e: Exception) { e.printStackTrace() } }

This should be reasonably equivalent. Please note that the if((text = br.readLine() != null) { cannot be written like that directly in Kotlin, however you can replace it with a while(true) { break;.

Manual close() is not needed if you are using .use {.

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