src/com/android/contacts/util/ContactPhotoUtils.java

/*
 * Copyright (C) 2012 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.contacts.util;

import android.content.ClipData;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.provider.MediaStore;
import android.support.v4.content.FileProvider;
import android.util.Log;

import com.android.contacts.R;

import com.google.common.io.Closeables;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;

/**
 * Utilities related to loading/saving contact photos.
 *
 */
public class ContactPhotoUtils {
    private static final String TAG = "ContactPhotoUtils";

    private static final String PHOTO_DATE_FORMAT = "'IMG'_yyyyMMdd_HHmmss";

    /**
     * Generate a new, unique file to be used as an out-of-band communication
     * channel, since hi-res Bitmaps are too big to serialize into a Bundle.
     * This file will be passed (as a uri) to other activities (such as the gallery/camera/
     *  cropper/etc.), and read by us once they are finished writing it.
     */
    public static Uri generateTempImageUri(Context context) {
        final String  fileProviderAuthority = context.getResources().getString(
                R.string.photo_file_provider_authority);
        return FileProvider.getUriForFile(context, fileProviderAuthority,
                new File(pathForTempPhoto(context, generateTempPhotoFileName())));
    }

    public static Uri generateTempCroppedImageUri(Context context) {
        final String  fileProviderAuthority = context.getResources().getString(
                R.string.photo_file_provider_authority);
        return FileProvider.getUriForFile(context, fileProviderAuthority,
                new File(pathForTempPhoto(context, generateTempCroppedPhotoFileName())));
    }

    private static String pathForTempPhoto(Context context, String fileName) {
        final File dir = context.getCacheDir();
        dir.mkdirs();
        final File f = new File(dir, fileName);
        return f.getAbsolutePath();
    }

    private static String generateTempPhotoFileName() {
        final Date date = new Date(System.currentTimeMillis());
        SimpleDateFormat dateFormat = new SimpleDateFormat(PHOTO_DATE_FORMAT, Locale.US);
        return "ContactPhoto-" + dateFormat.format(date) + ".jpg";
    }

    private static String generateTempCroppedPhotoFileName() {
        final Date date = new Date(System.currentTimeMillis());
        SimpleDateFormat dateFormat = new SimpleDateFormat(PHOTO_DATE_FORMAT, Locale.US);
        return "ContactPhoto-" + dateFormat.format(date) + "-cropped.jpg";
    }

    /**
     * Given a uri pointing to a bitmap, reads it into a bitmap and returns it.
     * @throws FileNotFoundException
     */
    public static Bitmap getBitmapFromUri(Context context, Uri uri) throws FileNotFoundException {
        final InputStream imageStream = context.getContentResolver().openInputStream(uri);
        try {
            return BitmapFactory.decodeStream(imageStream);
        } finally {
            Closeables.closeQuietly(imageStream);
        }
    }

    /**
     * Creates a byte[] containing the PNG-compressed bitmap, or null if
     * something goes wrong.
     */
    public static byte[] compressBitmap(Bitmap bitmap) {
        final int size = bitmap.getWidth() * bitmap.getHeight() * 4;
        final ByteArrayOutputStream out = new ByteArrayOutputStream(size);
        try {
            bitmap.compress(Bitmap.CompressFormat.PNG, 100, out);
            out.flush();
            out.close();
            return out.toByteArray();
        } catch (IOException e) {
            Log.w(TAG, "Unable to serialize photo: " + e.toString());
            return null;
        }
    }

    public static void addCropExtras(Intent intent, int photoSize) {
        intent.putExtra("crop", "true");
        intent.putExtra("scale", true);
        intent.putExtra("scaleUpIfNeeded", true);
        intent.putExtra("aspectX", 1);
        intent.putExtra("aspectY", 1);
        intent.putExtra("outputX", photoSize);
        intent.putExtra("outputY", photoSize);
    }

    /**
     * Adds common extras to gallery intents.
     *
     * @param intent The intent to add extras to.
     * @param photoUri The uri of the file to save the image to.
     */
    public static void addPhotoPickerExtras(Intent intent, Uri photoUri) {
        intent.putExtra(MediaStore.EXTRA_OUTPUT, photoUri);
        intent.addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION |
                Intent.FLAG_GRANT_READ_URI_PERMISSION);
        intent.setClipData(ClipData.newRawUri(MediaStore.EXTRA_OUTPUT, photoUri));
    }

    /**
     * Given an input photo stored in a uri, save it to a destination uri
     */
    public static boolean savePhotoFromUriToUri(Context context, Uri inputUri, Uri outputUri,
            boolean deleteAfterSave) {
        if (inputUri == null || outputUri == null) {
            return false;
        }
        try (FileOutputStream outputStream = context.getContentResolver()
                 .openAssetFileDescriptor(outputUri, "rw").createOutputStream();
             InputStream inputStream = context.getContentResolver().openInputStream(inputUri)) {

            final byte[] buffer = new byte[16 * 1024];
            int length;
            int totalLength = 0;
            while ((length = inputStream.read(buffer)) > 0) {
                outputStream.write(buffer, 0, length);
                totalLength += length;
            }
            if (Log.isLoggable(TAG, Log.VERBOSE)) {
                Log.v(TAG, "Wrote " + totalLength + " bytes for photo " + inputUri.toString());
            }
        } catch (IOException | NullPointerException e) {
            Log.e(TAG, "Failed to write photo: " + inputUri.toString() + " because: " + e);
            return false;
        } finally {
            if (deleteAfterSave) {
                context.getContentResolver().delete(inputUri, null, null);
            }
        }
        return true;
    }
}