Java tutorial
/******************************************************************************* * This file is part of RedReader. * * RedReader is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * RedReader is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with RedReader. If not, see <http://www.gnu.org/licenses/>. ******************************************************************************/ package org.quantumbadger.redreader.image; import android.content.Intent; import android.net.Uri; import android.os.Environment; import android.support.v4.content.FileProvider; import android.support.v7.app.AppCompatActivity; import org.quantumbadger.redreader.R; import org.quantumbadger.redreader.account.RedditAccount; import org.quantumbadger.redreader.account.RedditAccountManager; import org.quantumbadger.redreader.activities.BaseActivity; import org.quantumbadger.redreader.activities.BugReportActivity; import org.quantumbadger.redreader.cache.CacheManager; import org.quantumbadger.redreader.cache.CacheRequest; import org.quantumbadger.redreader.cache.downloadstrategy.DownloadStrategyIfNotCached; import org.quantumbadger.redreader.common.Constants; import org.quantumbadger.redreader.common.General; import org.quantumbadger.redreader.common.LinkHandler; import org.quantumbadger.redreader.common.RRError; import java.io.File; import java.io.IOException; import java.io.InputStream; import java.util.UUID; /** * Created by Marco Ammon on 01.03.2017. */ public class ShareImageCallback implements BaseActivity.PermissionCallback { private final AppCompatActivity activity; private final String uri; public ShareImageCallback(final AppCompatActivity activity, final String uri) { this.activity = activity; this.uri = uri; } @Override public void onPermissionGranted() { final RedditAccount anon = RedditAccountManager.getAnon(); LinkHandler.getImageInfo(activity, uri, Constants.Priority.IMAGE_VIEW, 0, new GetImageInfoListener() { @Override public void onFailure(final @CacheRequest.RequestFailureType int type, final Throwable t, final Integer status, final String readableMessage) { final RRError error = General.getGeneralErrorForFailure(activity, type, t, status, uri); General.showResultDialog(activity, error); } @Override public void onSuccess(final ImageInfo info) { CacheManager.getInstance(activity) .makeRequest(new CacheRequest(General.uriFromString(info.urlOriginal), anon, null, Constants.Priority.IMAGE_VIEW, 0, DownloadStrategyIfNotCached.INSTANCE, Constants.FileType.IMAGE, CacheRequest.DOWNLOAD_QUEUE_IMMEDIATE, false, false, activity) { @Override protected void onCallbackException(Throwable t) { BugReportActivity.handleGlobalError(context, t); } @Override protected void onDownloadNecessary() { General.quickToast(context, R.string.download_downloading); } @Override protected void onDownloadStarted() { } @Override protected void onFailure(@CacheRequest.RequestFailureType int type, Throwable t, Integer status, String readableMessage) { final RRError error = General.getGeneralErrorForFailure(context, type, t, status, url.toString()); General.showResultDialog(activity, error); } @Override protected void onProgress(boolean authorizationInProgress, long bytesRead, long totalBytes) { } @Override protected void onSuccess(CacheManager.ReadableCacheFile cacheFile, long timestamp, UUID session, boolean fromCache, String mimetype) { String filename = General.filenameFromString(info.urlOriginal); File dst = new File(Environment.getExternalStoragePublicDirectory( Environment.DIRECTORY_PICTURES), filename); if (dst.exists()) { int count = 0; while (dst.exists()) { count++; dst = new File( Environment.getExternalStoragePublicDirectory( Environment.DIRECTORY_PICTURES), count + "_" + filename.substring(1)); } } Uri sharedImage = FileProvider.getUriForFile(context, "org.quantumbadger.redreader.provider", dst); try { final InputStream cacheFileInputStream = cacheFile.getInputStream(); if (cacheFileInputStream == null) { notifyFailure(CacheRequest.REQUEST_FAILURE_CACHE_MISS, null, null, "Could not find cached image"); return; } General.copyFile(cacheFileInputStream, dst); Intent shareIntent = new Intent(); shareIntent.setAction(Intent.ACTION_SEND); shareIntent.putExtra(Intent.EXTRA_STREAM, sharedImage); shareIntent.setType(mimetype); activity.startActivity(Intent.createChooser(shareIntent, activity.getString(R.string.action_share_image))); } catch (IOException e) { notifyFailure(CacheRequest.REQUEST_FAILURE_STORAGE, e, null, "Could not copy file"); return; } activity.sendBroadcast( new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, sharedImage)); General.quickToast(context, context.getString(R.string.action_save_image_success) + " " + dst.getAbsolutePath()); } }); } @Override public void onNotAnImage() { General.quickToast(activity, R.string.selected_link_is_not_image); } }); } @Override public void onPermissionDenied() { General.quickToast(activity, R.string.save_image_permission_denied); } }