Share generated barcodes

app/src/main/AndroidManifest.xml

@@ -7,6 +7,7 @@
 		android:xlargeScreens="true"/>
 	<uses-permission android:name="android.permission.CAMERA"/>
 	<uses-permission android:name="android.permission.VIBRATE"/>
+	<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
 	<uses-feature android:name="android.hardware.camera"/>
 	<uses-feature android:name="android.hardware.camera.autofocus"/>
 	<application
@@ -52,5 +53,14 @@
 		<activity
 			android:name=".activity.MainActivity"
 			android:label="@string/app_name"/>
+		<provider
+			android:name="android.support.v4.content.FileProvider"
+			android:authorities="${applicationId}.provider"
+			android:exported="false"
+			android:grantUriPermissions="true">
+			<meta-data
+				android:name="android.support.FILE_PROVIDER_PATHS"
+				android:resource="@xml/file_paths"/>
+		</provider>
 	</application>
 </manifest>

app/src/main/kotlin/de/markusfisch/android/binaryeye/activity/CameraActivity.kt

@@ -14,12 +14,10 @@ import de.markusfisch.android.binaryeye.R
 import android.content.Context
 import android.content.Intent
 import android.content.pm.PackageManager
-import android.content.SharedPreferences
 import android.hardware.Camera
 import android.net.Uri
 import android.os.Bundle
 import android.os.Vibrator
-import android.preference.PreferenceManager
 import android.support.v4.app.ActivityCompat
 import android.support.v4.content.ContextCompat
 import android.support.v7.app.AppCompatActivity

app/src/main/kotlin/de/markusfisch/android/binaryeye/fragment/BarcodeFragment.kt

@@ -3,17 +3,30 @@ package de.markusfisch.android.binaryeye.fragment
 import com.google.zxing.BarcodeFormat
 
 import de.markusfisch.android.binaryeye.zxing.Zxing
+import de.markusfisch.android.binaryeye.BuildConfig
 import de.markusfisch.android.binaryeye.R
 
+import android.content.Intent
+import android.net.Uri
+import android.os.Build
 import android.os.Bundle
 import android.graphics.Bitmap
 import android.support.v4.app.Fragment
+import android.support.v4.content.FileProvider
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
 import android.widget.ImageView
 import android.widget.Toast
 
+import java.io.File
+import java.io.FileOutputStream
+import java.io.IOException
+
+import kotlinx.coroutines.Dispatchers.Main
+import kotlinx.coroutines.GlobalScope
+import kotlinx.coroutines.launch
+
 class BarcodeFragment : Fragment() {
 	override fun onCreateView(
 		inflater: LayoutInflater,
@@ -49,11 +62,58 @@ class BarcodeFragment : Fragment() {
 				return null
 			}
 			view.findViewById<ImageView>(R.id.barcode).setImageBitmap(bitmap)
+			view.findViewById<View>(R.id.share).setOnClickListener { _ ->
+				bitmap?.let {
+					share(bitmap)
+				}
+			}
 		}
 
 		return view
 	}
 
+	private fun share(bitmap: Bitmap) {
+		GlobalScope.launch {
+			val file = saveBitmap(bitmap)
+			GlobalScope.launch(Main) {
+				file?.let {
+					val intent = Intent(Intent.ACTION_SEND)
+					intent.putExtra(Intent.EXTRA_STREAM, getUriForFile(file))
+					intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
+					intent.setType("image/png")
+					startActivity(intent)
+				}
+			}
+		}
+	}
+
+	private fun saveBitmap(bitmap: Bitmap): File? {
+		try {
+			val file = File(
+				context.getExternalCacheDir(),
+				"shared_barcode.png"
+			)
+			val fos = FileOutputStream(file)
+			bitmap.compress(Bitmap.CompressFormat.PNG, 90, fos)
+			fos.close()
+			return file
+		} catch (e: IOException) {
+			return null
+		}
+	}
+
+	private fun getUriForFile(file: File): Uri {
+		return if (Build.VERSION.SDK_INT < Build.VERSION_CODES.N) {
+			Uri.fromFile(file)
+		} else {
+			FileProvider.getUriForFile(
+				context,
+				BuildConfig.APPLICATION_ID + ".provider",
+				file
+			)
+		}
+	}
+
 	companion object {
 		private const val CONTENT = "content"
 		private const val FORMAT = "format"

app/src/main/kotlin/de/markusfisch/android/binaryeye/fragment/HistoryFragment.kt

@@ -16,9 +16,6 @@ import android.os.Bundle
 import android.support.v4.app.Fragment
 import android.support.v7.widget.SwitchCompat
 import android.view.LayoutInflater
-import android.view.Menu
-import android.view.MenuInflater
-import android.view.MenuItem
 import android.view.View
 import android.view.ViewGroup
 import android.widget.ListView

app/src/main/res/layout/fragment_barcode.xml

@@ -1,6 +1,24 @@
-<ImageView
+<RelativeLayout
 	xmlns:android="http://schemas.android.com/apk/res/android"
-	android:id="@+id/barcode"
+	xmlns:app="http://schemas.android.com/apk/res-auto"
+	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
-	android:layout_height="match_parent"
-	android:contentDescription="@string/view_barcode"/>
+	android:layout_height="match_parent">
+	<ImageView
+		xmlns:android="http://schemas.android.com/apk/res/android"
+		android:id="@+id/barcode"
+		android:layout_width="match_parent"
+		android:layout_height="match_parent"
+		android:contentDescription="@string/view_barcode"/>
+	<android.support.design.widget.FloatingActionButton
+		tools:ignore="UnusedAttribute"
+		android:id="@+id/share"
+		android:layout_width="wrap_content"
+		android:layout_height="wrap_content"
+		android:layout_alignParentEnd="true"
+		android:layout_alignParentRight="true"
+		android:layout_alignParentBottom="true"
+		android:layout_margin="20dp"
+		android:src="@drawable/ic_action_share"
+		app:elevation="4dp"/>
+</RelativeLayout>

app/src/main/res/xml/file_paths.xml

@@ -0,0 +1,3 @@
+<paths xmlns:android="http://schemas.android.com/apk/res/android">
+	<external-path name="external_files" path="."/>
+</paths>