Printing option (EXPOSUREAPP-5675) (#2574)

* Create PrintingAdapter.kt

* Update PrintingAdapter.kt

* Test printing

* Update QrCodeCreationTestViewModel.kt

* Remove Charset causing crash only older versions

* Log

* Add logs and specify media size

Corona-Warn-App/src/deviceForTesters/java/de/rki/coronawarnapp/test/eventregistration/ui/PrintingAdapter.kt

+package de.rki.coronawarnapp.test.eventregistration.ui
+
+import android.os.Bundle
+import android.os.CancellationSignal
+import android.os.ParcelFileDescriptor
+import android.print.PageRange
+import android.print.PrintAttributes
+import android.print.PrintDocumentAdapter
+import android.print.PrintDocumentInfo
+import timber.log.Timber
+import java.io.File
+import java.io.FileInputStream
+import java.io.FileOutputStream
+
+/**
+ * Printing adapter for poster PDF files
+ */
+class PrintingAdapter(
+    private val file: File
+) : PrintDocumentAdapter() {
+
+    override fun onLayout(
+        oldAttributes: PrintAttributes?,
+        newAttributes: PrintAttributes?,
+        cancellationSignal: CancellationSignal,
+        callback: LayoutResultCallback,
+        extras: Bundle?
+    ) {
+        if (cancellationSignal.isCanceled) {
+            callback.onLayoutCancelled()
+            Timber.i("onLayoutCancelled")
+            return
+        }
+
+        val info = PrintDocumentInfo.Builder(file.name)
+            .setContentType(PrintDocumentInfo.CONTENT_TYPE_DOCUMENT)
+            .setPageCount(PrintDocumentInfo.PAGE_COUNT_UNKNOWN)
+            .build()
+        Timber.i(
+            "onLayoutFinished(info:%s, oldAttributes:%s, newAttributes:%s)",
+            info,
+            oldAttributes,
+            newAttributes
+        )
+        callback.onLayoutFinished(info, oldAttributes != newAttributes)
+    }
+
+    override fun onWrite(
+        pages: Array<out PageRange>,
+        destination: ParcelFileDescriptor,
+        cancellationSignal: CancellationSignal,
+        callback: WriteResultCallback
+    ) = try {
+        FileInputStream(file).use { input ->
+            FileOutputStream(destination.fileDescriptor).use { output ->
+                val bytesCopied = input.copyTo(output)
+                Timber.i("bytesCopied:$bytesCopied")
+            }
+        }
+
+        when {
+            cancellationSignal.isCanceled -> {
+                Timber.i("onWriteCancelled")
+                callback.onWriteCancelled()
+            }
+            else -> {
+                Timber.i("onWriteFinished")
+                callback.onWriteFinished(arrayOf(PageRange.ALL_PAGES))
+            }
+        }
+    } catch (e: Exception) {
+        callback.onWriteFailed(e.message)
+        Timber.e(e, "Printing $file failed")
+    }
+}

Corona-Warn-App/src/deviceForTesters/java/de/rki/coronawarnapp/test/eventregistration/ui/qrcode/QrCodeCreationTestFragment.kt

@@ -2,17 +2,22 @@ package de.rki.coronawarnapp.test.eventregistration.ui.qrcode
 
 import android.annotation.SuppressLint
 import android.os.Bundle
+import android.print.PrintAttributes
+import android.print.PrintManager
 import android.view.View
 import android.widget.Toast
+import androidx.core.content.getSystemService
 import androidx.core.view.isVisible
 import androidx.fragment.app.Fragment
 import de.rki.coronawarnapp.R
 import de.rki.coronawarnapp.databinding.FragmentTestQrcodeCreationBinding
+import de.rki.coronawarnapp.test.eventregistration.ui.PrintingAdapter
 import de.rki.coronawarnapp.util.di.AutoInject
 import de.rki.coronawarnapp.util.ui.observe2
 import de.rki.coronawarnapp.util.ui.viewBindingLazy
 import de.rki.coronawarnapp.util.viewmodel.CWAViewModelFactoryProvider
 import de.rki.coronawarnapp.util.viewmodel.cwaViewModels
+import timber.log.Timber
 import javax.inject.Inject
 
 class QrCodeCreationTestFragment : Fragment(R.layout.fragment_test_qrcode_creation), AutoInject {
@@ -25,13 +30,42 @@ class QrCodeCreationTestFragment : Fragment(R.layout.fragment_test_qrcode_creati
     @SuppressLint("SetTextI18n")
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
 
-        viewModel.sharingIntent.observe2(this) {
-            startActivity(it.get(requireActivity()))
+        viewModel.sharingIntent.observe2(this) { fileIntent ->
+
+            binding.printPDF.isVisible = true
+            binding.printPDF.setOnClickListener {
+                // Context must be an Activity context
+                val printingManger = context?.getSystemService<PrintManager>()
+                Timber.i("PrintingManager: $printingManger")
+                printingManger?.apply {
+                    val printingJob = print(
+                        "CoronaWarnApp",
+                        PrintingAdapter(fileIntent.file),
+                        PrintAttributes
+                            .Builder()
+                            .setMediaSize(PrintAttributes.MediaSize.ISO_A3)
+                            .build()
+                    )
+
+                    Timber.i("PrintingJob:$printingJob")
+                    Timber.i("PrintingJob isBlocked:${printingJob.isBlocked}")
+                    Timber.i("PrintingJob isCancelled:${printingJob.isCancelled}")
+                    Timber.i("PrintingJob isCompleted:${printingJob.isCompleted}")
+                    Timber.i("PrintingJob isFailed:${printingJob.isFailed}")
+                    Timber.i("PrintingJob info:${printingJob.info}")
+                }
+            }
+            binding.sharePDF.isVisible = true
+            binding.sharePDF.setOnClickListener {
+                startActivity(fileIntent.intent(requireActivity()))
+            }
         }
 
         viewModel.qrCodeBitmap.observe2(this) {
             binding.qrCodeImage.setImageBitmap(it)
-            binding.printPDF.isVisible = it != null
+            if (it != null) {
+                viewModel.createPDF(binding.pdfPage)
+            }
         }
 
         viewModel.errorMessage.observe2(this) {
@@ -46,9 +80,5 @@ class QrCodeCreationTestFragment : Fragment(R.layout.fragment_test_qrcode_creati
         binding.generateQrCode.setOnClickListener {
             viewModel.createQrCode(binding.qrCodeText.text.toString())
         }
-
-        binding.printPDF.setOnClickListener {
-            viewModel.createPDF(binding.pdfPage)
-        }
     }
 }

Corona-Warn-App/src/deviceForTesters/java/de/rki/coronawarnapp/test/eventregistration/ui/qrcode/QrCodeCreationTestViewModel.kt

@@ -31,7 +31,7 @@ class QrCodeCreationTestViewModel @AssistedInject constructor(
 
     val qrCodeBitmap = SingleLiveEvent<Bitmap>()
     val errorMessage = SingleLiveEvent<String>()
-    val sharingIntent = SingleLiveEvent<FileSharing.ShareIntentProvider>()
+    val sharingIntent = SingleLiveEvent<FileSharing.FileIntentProvider>()
 
     /**
      * Creates a QR Code [Bitmap] ,result is delivered by [qrCodeBitmap]
@@ -68,7 +68,7 @@ class QrCodeCreationTestViewModel @AssistedInject constructor(
             }
 
             sharingIntent.postValue(
-                fileSharing.getIntentProvider(file, "Scan and Help")
+                fileSharing.getFileIntentProvider(file, "Scan and Help")
             )
         } catch (e: Exception) {
             errorMessage.postValue(e.localizedMessage ?: "Creating pdf failed")
@@ -85,8 +85,10 @@ class QrCodeCreationTestViewModel @AssistedInject constructor(
     private fun encodeAsBitmap(input: String, size: Int = 1000): Bitmap? {
         return try {
             val hints = mapOf(
-                EncodeHintType.ERROR_CORRECTION to ErrorCorrectionLevel.H,
-                EncodeHintType.CHARACTER_SET to Charsets.UTF_8
+                EncodeHintType.ERROR_CORRECTION to ErrorCorrectionLevel.H
+                // This is not required in the specs and it should not be enabled
+                // it is causing crash on older Android versions ex:API 23
+                // EncodeHintType.CHARACTER_SET to Charsets.UTF_8
             )
             MultiFormatWriter().encode(
                 input,

Corona-Warn-App/src/deviceForTesters/res/layout/fragment_test_qrcode_creation.xml

@@ -17,21 +17,33 @@
             android:layout_height="wrap_content"
             android:layout_marginTop="24dp"
             android:text="QR Code"
-            app:layout_constraintEnd_toStartOf="@+id/printPDF"
+            app:layout_constraintEnd_toStartOf="@+id/sharePDF"
             app:layout_constraintHorizontal_bias="0.5"
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintTop_toTopOf="parent" />
 
+        <com.google.android.material.button.MaterialButton
+            android:id="@+id/sharePDF"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="24dp"
+            android:text="Share PDF"
+            android:visibility="invisible"
+            app:layout_constraintEnd_toStartOf="@+id/printPDF"
+            app:layout_constraintHorizontal_bias="0.5"
+            app:layout_constraintStart_toEndOf="@+id/generateQrCode"
+            app:layout_constraintTop_toTopOf="parent" />
+
         <com.google.android.material.button.MaterialButton
             android:id="@+id/printPDF"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_marginTop="24dp"
-            android:text="PDF"
-            android:visibility="gone"
+            android:text="Print PDF"
+            android:visibility="invisible"
             app:layout_constraintEnd_toEndOf="parent"
             app:layout_constraintHorizontal_bias="0.5"
-            app:layout_constraintStart_toEndOf="@+id/generateQrCode"
+            app:layout_constraintStart_toEndOf="@+id/sharePDF"
             app:layout_constraintTop_toTopOf="parent" />
 
         <com.google.android.material.textfield.TextInputLayout

Corona-Warn-App/src/main/java/de/rki/coronawarnapp/util/files/FileSharing.kt

@@ -50,6 +50,38 @@ class FileSharing @Inject constructor(
         }
     }
 
+    fun getFileIntentProvider(
+        path: File,
+        title: String,
+        @StringRes chooserTitle: Int? = null
+    ): FileIntentProvider = object : FileIntentProvider {
+        override fun intent(activity: Activity): Intent {
+            val builder = ShareCompat.IntentBuilder.from(activity).apply {
+                setType(path.determineMimeType())
+                setStream(getFileUri(path))
+                setSubject(title)
+                chooserTitle?.let { setChooserTitle(it) }
+            }
+
+            val intent = if (chooserTitle != null) {
+                builder.createChooserIntent()
+            } else {
+                builder.intent
+            }
+            return intent.apply {
+                addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
+                Timber.tag(TAG).d("Intent created %s", this)
+            }
+        }
+
+        override val file: File = path
+    }
+
+    interface FileIntentProvider {
+        fun intent(activity: Activity): Intent
+        val file: File
+    }
+
     interface ShareIntentProvider {
         fun get(activity: Activity): Intent
     }