Add print capability.

Author: philip-lamb

Android/app/src/main/java/org/artoolkitx/utilities/cameracalibration/CameraCalibrationActivity.java

@@ -1,8 +1,13 @@
 package org.artoolkitx.utilities.cameracalibration;
 
+import android.content.Context;
 import android.content.Intent;
 import android.os.Bundle;
 import android.net.Uri;
+import android.print.PrintAttributes;
+import android.print.PrintDocumentAdapter;
+import android.print.PrintManager;
+import android.util.Log;
 import android.view.Menu;
 import android.view.MenuInflater;
 import android.view.MenuItem;
@@ -13,6 +18,8 @@
 import org.libsdl.app.SDLActivity;
 
 public class CameraCalibrationActivity extends SDLActivity {
+
+    static final String TAG = "CameraCalibrationActivity";
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -38,6 +45,22 @@ public boolean onOptionsItemSelected(@NonNull MenuItem item) {
                 startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("https://github.com/artoolkitx/artoolkitx-calibration/wiki")));
                 return true;
             case R.id.menu_print:
+                PrintManager printManager = (PrintManager) this.getSystemService(Context.PRINT_SERVICE);
+                try
+                {
+                    PrintDocumentAdapter printAdapter = null;
+                    if (getSharedPreferences("cameracalibrationsettings", MODE_PRIVATE).getString("print_paper_size", "a4") == "usletter") {
+                        printAdapter = new PdfDocumentAdapter(this, R.raw.printusletter, "Calibration chessboard (US Letter)", 1);
+                    } else {
+                        // Assume A4.
+                        printAdapter = new PdfDocumentAdapter(this, R.raw.printa4, "Calibration chessboard (A4)", 1);
+                    }
+                    printManager.print("Printing calibration pattern", printAdapter, new PrintAttributes.Builder().build());
+                }
+                catch (Exception e)
+                {
+                    Log.e(TAG, "onOptionsItemSelected: " + e);
+                }
                 return true;
             case R.id.menu_settings:
                 startActivity(new Intent(this, CameraCalibrationSettingsActivity.class));

Android/app/src/main/java/org/artoolkitx/utilities/cameracalibration/PdfDocumentAdapter.java

@@ -0,0 +1,104 @@
+package org.artoolkitx.utilities.cameracalibration;
+
+import android.content.Context;
+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 android.util.Log;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.nio.file.Paths;
+
+public class PdfDocumentAdapter extends PrintDocumentAdapter {
+
+    static final String LOGTAG = "PdfDocumentAdapter";
+    Context context = null;
+    String pathName = null;
+    String name = null;
+    int resID = 0;
+    int pageCount = 0;
+
+    public PdfDocumentAdapter(Context ctxt, String pathName, String name, int pageCount) {
+        context = ctxt;
+        this.pathName = pathName;
+        this.name = name;
+        this.resID = 0;
+        this.pageCount = pageCount;
+    }
+
+    // Use e.g. new PdfDocumentAdapter(getApplicationContext, R.raw.myfile.pdf, 0);
+    public PdfDocumentAdapter(Context ctxt, int resID, String name, int pageCount) {
+        context = ctxt;
+        this.pathName = null;
+        this.name = name;
+        this.resID = resID;
+        this.pageCount = pageCount;
+    }
+
+    @Override
+    public void onLayout(PrintAttributes printAttributes, PrintAttributes printAttributes1, CancellationSignal cancellationSignal, LayoutResultCallback layoutResultCallback, Bundle bundle) {
+        if (cancellationSignal.isCanceled()) {
+            layoutResultCallback.onLayoutCancelled();
+        } else {
+            PrintDocumentInfo.Builder builder = new PrintDocumentInfo.Builder(name);
+            builder.setContentType(PrintDocumentInfo.CONTENT_TYPE_DOCUMENT)
+                    .setPageCount(pageCount > 0 ? pageCount : PrintDocumentInfo.PAGE_COUNT_UNKNOWN)
+                    .build();
+            layoutResultCallback.onLayoutFinished(builder.build(),
+                    !printAttributes1.equals(printAttributes));
+        }
+    }
+
+    @Override
+    public void onWrite(PageRange[] pageRanges, ParcelFileDescriptor parcelFileDescriptor, CancellationSignal cancellationSignal, WriteResultCallback writeResultCallback) {
+        InputStream in = null;
+        OutputStream out = null;
+        try {
+            if (resID != 0) {
+                in = context.getResources().openRawResource(resID);
+            } else if (pathName != null) {
+                File file = new File(pathName);
+                in = new FileInputStream(file);
+            } else {
+                writeResultCallback.onWriteFailed("Nothing to print");
+                return;
+            }
+            out = new FileOutputStream(parcelFileDescriptor.getFileDescriptor());
+
+            byte[] buf = new byte[16384];
+            int size;
+
+            while ((size = in.read(buf)) >= 0 && !cancellationSignal.isCanceled()) {
+                out.write(buf, 0, size);
+            }
+
+            if (cancellationSignal.isCanceled()) {
+                writeResultCallback.onWriteCancelled();
+            } else {
+                writeResultCallback.onWriteFinished(new PageRange[] { PageRange.ALL_PAGES });
+            }
+        }
+        catch (Exception e) {
+            writeResultCallback.onWriteFailed(e.getMessage());
+            Log.e(LOGTAG, "onWrite: " + e);
+        }
+        finally {
+            try {
+                in.close();
+                out.close();
+            }
+            catch (IOException e) {
+                Log.e(LOGTAG, "close: " + e);
+            }
+        }
+    }
+}