1 files changed, 221 insertions, 0 deletions
diff --git a/samples/browseable/PdfRendererBasic/src/com.example.android.pdfrendererbasic/PdfRendererBasicFragment.java b/samples/browseable/PdfRendererBasic/src/com.example.android.pdfrendererbasic/PdfRendererBasicFragment.java
new file mode 100644
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+++ b/samples/browseable/PdfRendererBasic/src/com.example.android.pdfrendererbasic/PdfRendererBasicFragment.java
@@ -0,0 +1,221 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.example.android.pdfrendererbasic;
+
+import android.app.Activity;
+import android.app.Fragment;
+import android.content.Context;
+import android.graphics.Bitmap;
+import android.graphics.pdf.PdfRenderer;
+import android.os.Bundle;
+import android.os.ParcelFileDescriptor;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.Button;
+import android.widget.ImageView;
+import android.widget.Toast;
+
+import java.io.IOException;
+
+/**
+ * This fragment has a big {@ImageView} that shows PDF pages, and 2 {@link android.widget.Button}s to move between
+ * pages. We use a {@link android.graphics.pdf.PdfRenderer} to render PDF pages as {@link android.graphics.Bitmap}s.
+ */
+public class PdfRendererBasicFragment extends Fragment implements View.OnClickListener {
+
+    /**
+     * Key string for saving the state of current page index.
+     */
+    private static final String STATE_CURRENT_PAGE_INDEX = "current_page_index";
+
+    /**
+     * File descriptor of the PDF.
+     */
+    private ParcelFileDescriptor mFileDescriptor;
+
+    /**
+     * {@link android.graphics.pdf.PdfRenderer} to render the PDF.
+     */
+    private PdfRenderer mPdfRenderer;
+
+    /**
+     * Page that is currently shown on the screen.
+     */
+    private PdfRenderer.Page mCurrentPage;
+
+    /**
+     * {@link android.widget.ImageView} that shows a PDF page as a {@link android.graphics.Bitmap}
+     */
+    private ImageView mImageView;
+
+    /**
+     * {@link android.widget.Button} to move to the previous page.
+     */
+    private Button mButtonPrevious;
+
+    /**
+     * {@link android.widget.Button} to move to the next page.
+     */
+    private Button mButtonNext;
+
+    public PdfRendererBasicFragment() {
+    }
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container,
+                             Bundle savedInstanceState) {
+        return inflater.inflate(R.layout.fragment_pdf_renderer_basic, container, false);
+    }
+
+    @Override
+    public void onViewCreated(View view, Bundle savedInstanceState) {
+        super.onViewCreated(view, savedInstanceState);
+        // Retain view references.
+        mImageView = (ImageView) view.findViewById(R.id.image);
+        mButtonPrevious = (Button) view.findViewById(R.id.previous);
+        mButtonNext = (Button) view.findViewById(R.id.next);
+        // Bind events.
+        mButtonPrevious.setOnClickListener(this);
+        mButtonNext.setOnClickListener(this);
+        // Show the first page by default.
+        int index = 0;
+        // If there is a savedInstanceState (screen orientations, etc.), we restore the page index.
+        if (null != savedInstanceState) {
+            index = savedInstanceState.getInt(STATE_CURRENT_PAGE_INDEX, 0);
+        }
+        showPage(index);
+    }
+
+    @Override
+    public void onAttach(Activity activity) {
+        super.onAttach(activity);
+        try {
+            openRenderer(activity);
+        } catch (IOException e) {
+            e.printStackTrace();
+            Toast.makeText(activity, "Error! " + e.getMessage(), Toast.LENGTH_SHORT).show();
+            activity.finish();
+        }
+    }
+
+    @Override
+    public void onDetach() {
+        try {
+            closeRenderer();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+        super.onDetach();
+    }
+
+    @Override
+    public void onSaveInstanceState(Bundle outState) {
+        super.onSaveInstanceState(outState);
+        if (null != mCurrentPage) {
+            outState.putInt(STATE_CURRENT_PAGE_INDEX, mCurrentPage.getIndex());
+        }
+    }
+
+    /**
+     * Sets up a {@link android.graphics.pdf.PdfRenderer} and related resources.
+     */
+    private void openRenderer(Context context) throws IOException {
+        // In this sample, we read a PDF from the assets directory.
+        mFileDescriptor = context.getAssets().openFd("sample.pdf").getParcelFileDescriptor();
+        // This is the PdfRenderer we use to render the PDF.
+        mPdfRenderer = new PdfRenderer(mFileDescriptor);
+    }
+
+    /**
+     * Closes the {@link android.graphics.pdf.PdfRenderer} and related resources.
+     *
+     * @throws java.io.IOException When the PDF file cannot be closed.
+     */
+    private void closeRenderer() throws IOException {
+        if (null != mCurrentPage) {
+            mCurrentPage.close();
+        }
+        mPdfRenderer.close();
+        mFileDescriptor.close();
+    }
+
+    /**
+     * Shows the specified page of PDF to the screen.
+     *
+     * @param index The page index.
+     */
+    private void showPage(int index) {
+        if (mPdfRenderer.getPageCount() <= index) {
+            return;
+        }
+        // Make sure to close the current page before opening another one.
+        if (null != mCurrentPage) {
+            mCurrentPage.close();
+        }
+        // Use `openPage` to open a specific page in PDF.
+        mCurrentPage = mPdfRenderer.openPage(index);
+        // Important: the destination bitmap must be ARGB (not RGB).
+        Bitmap bitmap = Bitmap.createBitmap(mCurrentPage.getWidth(), mCurrentPage.getHeight(),
+                Bitmap.Config.ARGB_8888);
+        // Here, we render the page onto the Bitmap.
+        // To render a portion of the page, use the second and third parameter. Pass nulls to get
+        // the default result.
+        // Pass either RENDER_MODE_FOR_DISPLAY or RENDER_MODE_FOR_PRINT for the last parameter.
+        mCurrentPage.render(bitmap, null, null, PdfRenderer.Page.RENDER_MODE_FOR_DISPLAY);
+        // We are ready to show the Bitmap to user.
+        mImageView.setImageBitmap(bitmap);
+        updateUi();
+    }
+
+    /**
+     * Updates the state of 2 control buttons in response to the current page index.
+     */
+    private void updateUi() {
+        int index = mCurrentPage.getIndex();
+        int pageCount = mPdfRenderer.getPageCount();
+        mButtonPrevious.setEnabled(0 != index);
+        mButtonNext.setEnabled(index + 1 < pageCount);
+        getActivity().setTitle(getString(R.string.app_name_with_index, index + 1, pageCount));
+    }
+
+    /**
+     * Gets the number of pages in the PDF. This method is marked as public for testing.
+     *
+     * @return The number of pages.
+     */
+    public int getPageCount() {
+        return mPdfRenderer.getPageCount();
+    }
+
+    @Override
+    public void onClick(View view) {
+        switch (view.getId()) {
+            case R.id.previous: {
+                // Move to the previous page
+                showPage(mCurrentPage.getIndex() - 1);
+                break;
+            }
+            case R.id.next: {
+                // Move to the next page
+                showPage(mCurrentPage.getIndex() + 1);
+                break;
+            }
+        }
+    }
+
+}