Keep ParcelFileDescriptor open to work with old Android versions

Author: douglasjunior

android/src/main/java/com/github/douglasjunior/reactNativePdfRenderer/PdfRendererViewManagerImpl.java

@@ -22,8 +22,6 @@
 
 package com.github.douglasjunior.reactNativePdfRenderer;
 
-import android.graphics.pdf.PdfRenderer;
-import android.os.ParcelFileDescriptor;
 import android.text.TextUtils;
 import android.view.View;
 
@@ -70,25 +68,23 @@ public static void setParams(PdfRendererRecyclerView view, ReadableMap params, R
         if (TextUtils.isEmpty(source)) return;
         var file = new File(source.replace("file://", ""));
 
-        try (var fileDescriptor = ParcelFileDescriptor.open(file, ParcelFileDescriptor.MODE_READ_ONLY)) {
-            final PdfRenderer pdfRenderer = new PdfRenderer(fileDescriptor);
-
-            view.post(() -> {
-                view.updateSource(pdfRenderer);
-
+        view.post(() -> {
+            try {
                 view.setSinglePage(singlePage);
                 view.setMaxZoom(maxZoom);
                 view.setOverScrollMode(singlePage ? View.OVER_SCROLL_NEVER : View.OVER_SCROLL_IF_CONTENT_SCROLLS);
 
+                view.updateSource(file);
+
                 view.forceRequestLayout();
-            });
-        } catch (IOException e) {
-            if (BuildConfig.DEBUG) {
-                // noinspection CallToPrintStackTrace
-                e.printStackTrace();
+            } catch (IOException e) {
+                if (BuildConfig.DEBUG) {
+                    // noinspection CallToPrintStackTrace
+                    e.printStackTrace();
+                }
+                errorCallback.run();
             }
-            errorCallback.run();
-        }
+        });
     }
 
     public static Event<?> createOnPageChangeEvent(int surfaceId, int targetId, int position, int total) {

android/src/main/java/com/github/douglasjunior/reactNativePdfRenderer/modules/PdfRendererRecyclerView.java

@@ -30,6 +30,7 @@
 import android.graphics.Color;
 import android.graphics.Matrix;
 import android.graphics.pdf.PdfRenderer;
+import android.os.ParcelFileDescriptor;
 import android.util.Log;
 import android.util.TypedValue;
 import android.view.GestureDetector;
@@ -44,6 +45,9 @@
 
 import com.github.douglasjunior.reactNativePdfRenderer.BuildConfig;
 
+import java.io.File;
+import java.io.IOException;
+
 @SuppressLint({"ViewConstructor", "NotifyDataSetChanged"})
 public class PdfRendererRecyclerView extends RecyclerView {
     private final GestureDetector mGestureDetector;
@@ -120,12 +124,12 @@ private void dispatchPageChangeEvent() {
         }
     }
 
-    public void updateSource(PdfRenderer pdfRenderer) {
+    public void updateSource(File file) throws IOException {
         mCurrentItemPosition = -1;
         var adapter = (PdfRendererAdapter) getAdapter();
         if (adapter == null) return;
         adapter.close();
-        adapter.updateSource(pdfRenderer);
+        adapter.updateSource(file);
         adapter.notifyDataSetChanged();
         post(this::dispatchPageChangeEvent);
     }
@@ -252,6 +256,16 @@ public void requestLayout() {
 
     public void setSinglePage(boolean singlePage) {
         this.mSinglePage = singlePage;
+        if (mSinglePage) {
+            resetZoom();
+        }
+    }
+
+    private void resetZoom() {
+        mMatrix.setScale(1, 1, 0, 0);
+        validateMatrixLimits();
+        postInvalidateOnAnimation();
+        mZoomObserver.setZoom(1);
     }
 
     public interface PdfRendererRecyclerViewListener {
@@ -327,14 +341,30 @@ public boolean onDoubleTap(@NonNull MotionEvent e) {
 
     class PdfRendererAdapter extends Adapter<PdfRendererAdapter.ViewHolder> {
         private PdfRenderer mPdfRenderer;
+        private ParcelFileDescriptor mFileDescriptor;
 
-        public void updateSource(PdfRenderer pdfRenderer) {
-            mPdfRenderer = pdfRenderer;
+        public void updateSource(File file) throws IOException {
+            mFileDescriptor = ParcelFileDescriptor.open(file, ParcelFileDescriptor.MODE_READ_ONLY);
+            mPdfRenderer = new PdfRenderer(mFileDescriptor);
         }
 
         public void close() {
-            if (mPdfRenderer != null) mPdfRenderer.close();
-            mPdfRenderer = null;
+            if (mPdfRenderer != null) {
+                mPdfRenderer.close();
+                mPdfRenderer = null;
+            }
+            if (mFileDescriptor != null) {
+                try {
+                    mFileDescriptor.close();
+                } catch (IOException e) {
+                    if (BuildConfig.DEBUG) {
+                        // noinspection CallToPrintStackTrace
+                        e.printStackTrace();
+                    }
+                }
+                mFileDescriptor = null;
+            }
+
         }
 
         @NonNull
@@ -375,11 +405,6 @@ public int getItemCount() {
             return mPdfRenderer.getPageCount();
         }
 
-        public int getPageCount() {
-            if (mPdfRenderer == null) return 0;
-            return mPdfRenderer.getPageCount();
-        }
-
         public class ViewHolder extends RecyclerView.ViewHolder {
             private ObservableZoom.ZoomChangeListener zoomListener;
 

android/src/newarch/com/github/douglasjunior/reactNativePdfRenderer/modules/PdfRendererViewManager.java

@@ -83,31 +83,19 @@ private void sendEvent(PdfRendererRecyclerView target, Event<?> event) {
 
     @Override
     public void onPageChange(PdfRendererRecyclerView target, int position, int total) {
-        EventDispatcher eventDispatcher = UIManagerHelper.getEventDispatcherForReactTag(
-                mReactApplicationContext,
-                target.getId()
+        int surfaceId = UIManagerHelper.getSurfaceId(mReactApplicationContext);
+        sendEvent(
+                target,
+                PdfRendererViewManagerImpl.createOnPageChangeEvent(surfaceId, target.getId(), position, total)
         );
-
-        if (eventDispatcher != null) {
-            int surfaceId = UIManagerHelper.getSurfaceId(mReactApplicationContext);
-            eventDispatcher.dispatchEvent(
-                    PdfRendererViewManagerImpl.createOnPageChangeEvent(surfaceId, target.getId(), position, total)
-            );
-        }
     }
 
     private void onError(PdfRendererRecyclerView target) {
-        EventDispatcher eventDispatcher = UIManagerHelper.getEventDispatcherForReactTag(
-                mReactApplicationContext,
-                target.getId()
+        int surfaceId = UIManagerHelper.getSurfaceId(mReactApplicationContext);
+        sendEvent(
+                target,
+                PdfRendererViewManagerImpl.createOnErrorEvent(surfaceId, target.getId())
         );
-
-        if (eventDispatcher != null) {
-            int surfaceId = UIManagerHelper.getSurfaceId(mReactApplicationContext);
-            eventDispatcher.dispatchEvent(
-                    PdfRendererViewManagerImpl.createOnErrorEvent(surfaceId, target.getId())
-            );
-        }
     }
 
     @ReactProp(name = "maxPageResolution")