Add ability to save image to gallery

2018-04-04 22:30:11 -04:00
parent 7e7ee23df1
commit 7a7a481123
5 changed files with 116 additions and 9 deletions
@@ -0,0 +1,97 @@
+package repository
+
+import android.content.ContentResolver
+import android.content.ContentUris
+import android.content.ContentValues
+import android.content.Context
+import android.graphics.Bitmap
+import android.graphics.Matrix
+import android.net.Uri
+import android.provider.MediaStore
+import android.provider.MediaStore.Images
+import util.tryOrNull
+import javax.inject.Inject
+
+class ImageRepostoryImpl @Inject constructor(private val context: Context) : ImageRepository {
+
+    override fun saveImage(uri: Uri) {
+        val bitmap = tryOrNull { MediaStore.Images.Media.getBitmap(context.contentResolver, uri) }
+        insertImage(context.contentResolver, bitmap, "title", "description")
+    }
+
+    /**
+     * Modified from [android.provider.MediaStore.Images.Media.insertImage] to add date fields so
+     * that the saved image is put at the start of the gallery
+     */
+    private fun insertImage(cr: ContentResolver, source: Bitmap?, title: String, description: String): String? {
+
+        val values = ContentValues()
+        values.put(Images.Media.TITLE, title)
+        values.put(Images.Media.DISPLAY_NAME, title)
+        values.put(Images.Media.DESCRIPTION, description)
+        values.put(Images.Media.MIME_TYPE, "image/jpeg")
+
+        // Add the date meta data to ensure the image is added at the front of the gallery
+        values.put(Images.Media.DATE_ADDED, System.currentTimeMillis() / 1000)
+        values.put(Images.Media.DATE_TAKEN, System.currentTimeMillis())
+
+        var uri: Uri? = null
+
+        try {
+            uri = cr.insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values)
+
+            if (source != null) {
+                cr.openOutputStream(uri).use { imageOut ->
+                    source.compress(Bitmap.CompressFormat.JPEG, 100, imageOut)
+                }
+
+                val id = ContentUris.parseId(uri)
+                // Wait until MINI_KIND thumbnail is generated.
+                val miniThumb = Images.Thumbnails.getThumbnail(cr, id, Images.Thumbnails.MINI_KIND, null)
+                // This is for backward compatibility.
+                storeThumbnail(cr, miniThumb, id, 50f, 50f, Images.Thumbnails.MICRO_KIND)
+            } else {
+                cr.delete(uri, null, null)
+                uri = null
+            }
+        } catch (e: Exception) {
+            if (uri != null) {
+                cr.delete(uri, null, null)
+                uri = null
+            }
+        }
+
+        return uri?.toString()
+    }
+
+    /**
+     * Modified from [android.provider.MediaStore.Images.Media.insertImage] to add date fields so
+     * that the saved image is put at the start of the gallery
+     */
+    private fun storeThumbnail(cr: ContentResolver, source: Bitmap, id: Long, width: Float, height: Float, kind: Int): Bitmap? {
+        val matrix = Matrix()
+
+        val scaleX = width / source.width
+        val scaleY = height / source.height
+
+        matrix.setScale(scaleX, scaleY)
+
+        val thumb = Bitmap.createBitmap(source, 0, 0, source.width, source.height, matrix, true)
+
+        val values = ContentValues(4)
+        values.put(Images.Thumbnails.KIND, kind)
+        values.put(Images.Thumbnails.IMAGE_ID, id.toInt())
+        values.put(Images.Thumbnails.HEIGHT, thumb.height)
+        values.put(Images.Thumbnails.WIDTH, thumb.width)
+
+        val url = cr.insert(Images.Thumbnails.EXTERNAL_CONTENT_URI, values)
+
+        return tryOrNull {
+            val thumbOut = cr.openOutputStream(url)
+            thumb.compress(Bitmap.CompressFormat.JPEG, 100, thumbOut)
+            thumbOut.close()
+            thumb
+        }
+    }
+
+}