Java tutorial
/* Copyright 2013-2014, Silent Circle, LLC. All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Any redistribution, use, or modification is done solely for personal benefit and not for any commercial purpose or for monetary gain * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. * Neither the name Silent Circle nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SILENT CIRCLE, LLC BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /* * This implementation is edited version of original Android sources. */ /* * 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.silentcircle.contacts.utils; import android.annotation.TargetApi; 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.os.Build; import android.provider.MediaStore; import android.support.v4.content.FileProvider; import android.util.Log; 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 ContactPhotoUtils19 { private static final String TAG = "ContactPhotoUtils19"; private static final String PHOTO_DATE_FORMAT = "'IMG'_yyyyMMdd_HHmmss"; public static final String FILE_PROVIDER_AUTHORITY = "com.silentcircle.contacts.files"; /** * 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 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) { return FileProvider.getUriForFile(context, FILE_PROVIDER_AUTHORITY, new File(pathForTempPhoto(context, generateTempPhotoFileName()))); } public static Uri generateTempCroppedImageUri(Context context) { return FileProvider.getUriForFile(context, FILE_PROVIDER_AUTHORITY, 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 java.io.FileNotFoundException */ public static Bitmap getBitmapFromUri(Context context, Uri uri) throws FileNotFoundException { final InputStream imageStream = context.getContentResolver().openInputStream(uri); try { return BitmapFactory.decodeStream(imageStream); } finally { com.google.common.io.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. */ @TargetApi(Build.VERSION_CODES.KITKAT) 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) { FileOutputStream outputStream = null; InputStream inputStream = null; try { outputStream = context.getContentResolver().openAssetFileDescriptor(outputUri, "rw") .createOutputStream(); 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; } Log.v(TAG, "Wrote " + totalLength + " bytes for photo " + inputUri.toString() + " to: " + outputUri); } catch (IOException e) { Log.e(TAG, "Failed to write photo: " + inputUri.toString() + " because: " + e); return false; } finally { com.google.common.io.Closeables.closeQuietly(inputStream); com.google.common.io.Closeables.closeQuietly(outputStream); if (deleteAfterSave) { context.getContentResolver().delete(inputUri, null, null); } } return true; } }