Remove PDF Thumbnail functionality

import android.graphics.Point;

import android.net.Uri;

import android.os.Binder;

import android.os.Build;

import android.os.Bundle;

import android.os.CancellationSignal;

import android.os.FileObserver;

    private Handler mHandler;

    private static final String MIMETYPE_PDF = "application/pdf";

    private static final String MIMETYPE_JPEG = "image/jpeg";

    private static final String MIMETYPE_JPG = "image/jpg";

    private static final String MIMETYPE_OCTET_STREAM = "application/octet-stream";

            String documentId, Point sizeHint, CancellationSignal signal)

            throws FileNotFoundException {

        final File file = getFileForDocId(documentId);

        if (getTypeForFile(file).equals(MIMETYPE_PDF)) {

            try {

                return PdfUtils.openPdfThumbnail(file, sizeHint);

            } catch (Exception e) {

                Log.v(TAG, "Could not load PDF's thumbnail", e);

            }

        }

        return DocumentsContract.openImageThumbnail(file);

    }

        final String mimeType = getTypeForFile(file);

        final String displayName = file.getName();

        // As of right now, we aren't sure on the performance affect of loading all PDF Thumbnails

        // Until a solution is found, it will be behind a debuggable flag.

        if (mimeType.startsWith("image/") || mimeType.equals(MIMETYPE_PDF)) {

        if (mimeType.startsWith("image/")) {

            flags |= Document.FLAG_SUPPORTS_THUMBNAIL;

        }

/*

 * Copyright (C) 2017 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.android.internal.content;

import android.annotation.Nullable;

import android.content.res.AssetFileDescriptor;

import android.graphics.Bitmap;

import android.graphics.Matrix;

import android.graphics.Point;

import android.graphics.pdf.PdfRenderer;

import android.os.AsyncTask;

import android.os.ParcelFileDescriptor;

import libcore.io.IoUtils;

import libcore.io.Streams;

import java.io.ByteArrayInputStream;

import java.io.ByteArrayOutputStream;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

/**

 * Utils class for extracting PDF Thumbnails

 */

public final class PdfUtils {

    private PdfUtils() {

    }

    /**

     * Returns the front page of the pdf as a thumbnail

     * @param file Given PDF File

     * @param size Cropping of the front page.

     * @return AssetFileDescriptor containing the thumbnail as a bitmap.

     * @throws IOException if the file isn't a pdf or if the file doesn't exist.

     */

    public static @Nullable AssetFileDescriptor openPdfThumbnail(File file, Point size)

            throws IOException {

        // Create the bitmap of the PDF's first page

        ParcelFileDescriptor pdfDescriptor =

                ParcelFileDescriptor.open(file, ParcelFileDescriptor.MODE_READ_ONLY);

        PdfRenderer renderer = new PdfRenderer(pdfDescriptor);

        PdfRenderer.Page frontPage = renderer.openPage(0);

        Bitmap thumbnail = Bitmap.createBitmap(frontPage.getWidth(), frontPage.getHeight(),

                Bitmap.Config.ARGB_8888);

        frontPage.render(thumbnail, null, null, PdfRenderer.Page.RENDER_MODE_FOR_DISPLAY);

        thumbnail = crop(thumbnail, size.x, size.y, .5f, 0f);

        // Create an AssetFileDescriptor that contains the Bitmap's information

        final ByteArrayOutputStream out = new ByteArrayOutputStream();

        // Quality is an integer that determines how much compression is used.

        // However, this integer is ignored when using the PNG format

        int quality = 100;

        // The use of Bitmap.CompressFormat.JPEG leads to a black PDF background on the thumbnail

        thumbnail.compress(Bitmap.CompressFormat.PNG, quality, out);

        final ByteArrayInputStream in = new ByteArrayInputStream(out.toByteArray());

        final ParcelFileDescriptor[] fds = ParcelFileDescriptor.createReliablePipe();

        new AsyncTask<Object, Object, Object>() {

            @Override

            protected Object doInBackground(Object... params) {

                final FileOutputStream fos = new FileOutputStream(fds[1].getFileDescriptor());

                try {

                    Streams.copy(in, fos);

                } catch (IOException e) {

                    throw new RuntimeException(e);

                }

                IoUtils.closeQuietly(fds[1]);

                try {

                    pdfDescriptor.close();

                } catch (IOException e) {

                    throw new RuntimeException(e);

                }

                return null;

            }

        }.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);

        pdfDescriptor.close();

        return new AssetFileDescriptor(fds[0], 0, AssetFileDescriptor.UNKNOWN_LENGTH);

    }

    /**

     * Returns a new Bitmap copy with a crop effect depending on the crop anchor given. 0.5f is like

     * {@link android.widget.ImageView.ScaleType#CENTER_CROP}. The crop anchor will be be nudged

     * so the entire cropped bitmap will fit inside the src. May return the input bitmap if no

     * scaling is necessary.

     *

     *

     * Example of changing verticalCenterPercent:

     *   _________            _________

     *  |         |          |         |

     *  |         |          |_________|

     *  |         |          |         |/___0.3f

     *  |---------|          |_________|\

     *  |         |<---0.5f  |         |

     *  |---------|          |         |

     *  |         |          |         |

     *  |         |          |         |

     *  |_________|          |_________|

     *

     * @param src original bitmap of any size

     * @param w desired width in px

     * @param h desired height in px

     * @param horizontalCenterPercent determines which part of the src to crop from. Range from 0

     *                                .0f to 1.0f. The value determines which part of the src

     *                                maps to the horizontal center of the resulting bitmap.

     * @param verticalCenterPercent determines which part of the src to crop from. Range from 0

     *                              .0f to 1.0f. The value determines which part of the src maps

     *                              to the vertical center of the resulting bitmap.

     * @return a copy of src conforming to the given width and height, or src itself if it already

     *         matches the given width and height

     *

     */

    private static Bitmap crop(final Bitmap src, final int w, final int h,

            final float horizontalCenterPercent, final float verticalCenterPercent) {

        if (horizontalCenterPercent < 0 || horizontalCenterPercent > 1 || verticalCenterPercent < 0

                || verticalCenterPercent > 1) {

            throw new IllegalArgumentException(

                    "horizontalCenterPercent and verticalCenterPercent must be between 0.0f and "

                            + "1.0f, inclusive.");

        }

        final int srcWidth = src.getWidth();

        final int srcHeight = src.getHeight();

        // exit early if no resize/crop needed

        if (w == srcWidth && h == srcHeight) {

            return src;

        }

        final Matrix m = new Matrix();

        final float scale = Math.max(

                (float) w / srcWidth,

                (float) h / srcHeight);

        m.setScale(scale, scale);

        final int srcCroppedW, srcCroppedH;

        int srcX, srcY;

        srcCroppedW = Math.round(w / scale);

        srcCroppedH = Math.round(h / scale);

        srcX = (int) (srcWidth * horizontalCenterPercent - srcCroppedW / 2);

        srcY = (int) (srcHeight * verticalCenterPercent - srcCroppedH / 2);

        // Nudge srcX and srcY to be within the bounds of src

        srcX = Math.max(Math.min(srcX, srcWidth - srcCroppedW), 0);

        srcY = Math.max(Math.min(srcY, srcHeight - srcCroppedH), 0);

        final Bitmap cropped = Bitmap.createBitmap(src, srcX, srcY,

                srcCroppedW, srcCroppedH, m, true);

        return cropped;

    }

}