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annotate app/src/main/java/com/bartsent/simpleresizer/EditImage.kt @ 1:f26f61a8a9ad

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Make the EditImage activity stateful.
author David Barts <n5jrn@me.com>
date Mon, 01 Feb 2021 08:30:12 -0800
parents 13935000c2d9
children 06825e49f7aa
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1 package com.bartsent.simpleresizer
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2
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3 import android.graphics.Bitmap
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4 import android.graphics.BitmapFactory
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5 import android.net.Uri
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6 import android.os.Build
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7 import androidx.appcompat.app.AppCompatActivity
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8 import android.os.Bundle
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9 import android.provider.OpenableColumns
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10 import android.text.Html
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11 import android.text.Spanned
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12 import android.view.View
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13 import android.widget.TextView
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14 import android.widget.Toast
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15 import androidx.annotation.RequiresApi
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16 import androidx.databinding.DataBindingUtil
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17 import com.bartsent.simpleresizer.databinding.ActivityEditImageBinding
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18
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19
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20 class EditImage : AppCompatActivity() {
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21 object State {
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22 var uri: Uri? = null
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23 var bitmap: Bitmap? = null
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24 }
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25
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26 private lateinit var binding: ActivityEditImageBinding
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27
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28 override fun onCreate(savedInstanceState: Bundle?) {
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29 super.onCreate(savedInstanceState)
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30 binding = ActivityEditImageBinding.inflate(layoutInflater)
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31 setContentView(binding.root)
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32 }
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33
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34 private fun item(title: String, value: Any?): String =
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35 if (value == null)
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36 ""
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37 else
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38 "<b>${title}:</b> ${Html.escapeHtml(value.toString())}<br/>"
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39
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40 private fun fromHtml(input: String): Spanned =
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41 if (android.os.Build.VERSION.SDK_INT >= 24) {
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42 Html.fromHtml(input, Html.FROM_HTML_MODE_COMPACT)
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43 } else {
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44 Html.fromHtml(input)
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45 }
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47 // Cribbed from: https://stackoverflow.com/questions/5568874/how-to-extract-the-file-name-from-uri-returned-from-intent-action-get-content
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48 private fun getFileName(uri: Uri): String? {
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49 var result: String? = null
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50 if (uri.scheme == "content") {
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51 contentResolver.query(uri, null, null, null, null).use { cursor ->
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52 if (cursor != null && cursor.moveToFirst())
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53 result = cursor.getString(cursor.getColumnIndex(OpenableColumns.DISPLAY_NAME))
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54 }
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55 }
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56 if (result == null) {
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57 val uriPath = uri.path
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58 result = uriPath?.substring(uriPath.lastIndexOf('/') + 1)
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59 }
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60 return result
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61 }
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62
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63 override fun onResume() {
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64 super.onResume()
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65
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66 // Read the URI, die if we can't.
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67 val imageUri = intent?.data
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68 if (imageUri == null) {
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69 binding.imageStatusReport.text = fromHtml("<b>Error:</b> no URI supplied!")
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70 return
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71 }
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72
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73 // Being stateful stops data loss when the phone gets rotated.
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74 if (imageUri != State.uri) {
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75 State.uri = imageUri
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76 State.bitmap = contentResolver.openInputStream(imageUri).use {
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77 BitmapFactory.decodeStream(it)
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78 }
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79 }
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80 if (State.bitmap == null) {
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81 binding.imageStatusReport.text = fromHtml("<b>Error:</b> bad image!")
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82 return
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83 }
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84 val imageBitmap = State.bitmap!!
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85
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86 // OK, we have the Bitmap; operate on it.
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87 binding.imageStatusReport.text = fromHtml(
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88 item("Uri", imageUri) +
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89 item("File-Name", getFileName((imageUri))) +
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90 item("Byte-Count", imageBitmap.byteCount) +
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91 item("Density", imageBitmap.density) +
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92 item("Height", imageBitmap.height) +
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93 item("Width", imageBitmap.width) +
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94 item("Has-Alpha", imageBitmap.hasAlpha())
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95 )
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96 }
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97 }