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Copyright (c) 2009-2011 Dropbox Inc., http://www.dropbox.com/ Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "So...
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/* * Copyright (c) 2010-11 Dropbox, Inc.//from w ww . jav a 2 s . c om * * Permission is hereby granted, free of charge, to any person * obtaining a copy of this software and associated documentation * files (the "Software"), to deal in the Software without * restriction, including without limitation the rights to use, * copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following * conditions: * * The above copyright notice and this permission notice shall be * included in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. */ package com.dropbox.android.sample; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.util.ArrayList; import android.app.ProgressDialog; import android.content.Context; import android.content.DialogInterface; import android.content.DialogInterface.OnClickListener; import android.graphics.drawable.Drawable; import android.os.AsyncTask; import android.widget.ImageView; import android.widget.Toast; import com.dropbox.client2.DropboxAPI; import com.dropbox.client2.DropboxAPI.Entry; import com.dropbox.client2.DropboxAPI.ThumbFormat; import com.dropbox.client2.DropboxAPI.ThumbSize; import com.dropbox.client2.exception.DropboxException; import com.dropbox.client2.exception.DropboxIOException; import com.dropbox.client2.exception.DropboxParseException; import com.dropbox.client2.exception.DropboxPartialFileException; import com.dropbox.client2.exception.DropboxServerException; import com.dropbox.client2.exception.DropboxUnlinkedException; /** * Here we show getting metadata for a directory and downloading a file in a * background thread, trying to show typical exception handling and flow of * control for an app that downloads a file from Dropbox. */ public class DownloadRandomPicture extends AsyncTask<Void, Long, Boolean> { private Context mContext; private final ProgressDialog mDialog; private DropboxAPI<?> mApi; private String mPath; private ImageView mView; private Drawable mDrawable; private FileOutputStream mFos; private boolean mCanceled; private Long mFileLen; private String mErrorMsg; // Note that, since we use a single file name here for simplicity, you // won't be able to use this code for two simultaneous downloads. private final static String IMAGE_FILE_NAME = "dbroulette.png"; public DownloadRandomPicture(Context context, DropboxAPI<?> api, String dropboxPath, ImageView view) { // We set the context this way so we don't accidentally leak activities mContext = context.getApplicationContext(); mApi = api; mPath = dropboxPath; mView = view; mDialog = new ProgressDialog(context); mDialog.setMessage("Downloading Image"); mDialog.setButton("Cancel", new OnClickListener() { public void onClick(DialogInterface dialog, int which) { mCanceled = true; mErrorMsg = "Canceled"; // This will cancel the getThumbnail operation by closing // its stream if (mFos != null) { try { mFos.close(); } catch (IOException e) { } } } }); mDialog.show(); } @Override protected Boolean doInBackground(Void... params) { try { if (mCanceled) { return false; } // Get the metadata for a directory Entry dirent = mApi.metadata(mPath, 1000, null, true, null); if (!dirent.isDir || dirent.contents == null) { // It's not a directory, or there's nothing in it mErrorMsg = "File or empty directory"; return false; } // Make a list of everything in it that we can get a thumbnail for ArrayList<Entry> thumbs = new ArrayList<Entry>(); for (Entry ent: dirent.contents) { if (ent.thumbExists) { // Add it to the list of thumbs we can choose from thumbs.add(ent); } } if (mCanceled) { return false; } if (thumbs.size() == 0) { // No thumbs in that directory mErrorMsg = "No pictures in that directory"; return false; } // Now pick a random one int index = (int)(Math.random() * thumbs.size()); Entry ent = thumbs.get(index); String path = ent.path; mFileLen = ent.bytes; String cachePath = mContext.getCacheDir().getAbsolutePath() + "/" + IMAGE_FILE_NAME; try { mFos = new FileOutputStream(cachePath); } catch (FileNotFoundException e) { mErrorMsg = "Couldn't create a local file to store the image"; return false; } // This downloads a smaller, thumbnail version of the file. The // API to download the actual file is roughly the same. mApi.getThumbnail(path, mFos, ThumbSize.BESTFIT_960x640, ThumbFormat.JPEG, null); if (mCanceled) { return false; } mDrawable = Drawable.createFromPath(cachePath); // We must have a legitimate picture return true; } catch (DropboxUnlinkedException e) { // The AuthSession wasn't properly authenticated or user unlinked. } catch (DropboxPartialFileException e) { // We canceled the operation mErrorMsg = "Download canceled"; } catch (DropboxServerException e) { // Server-side exception. These are examples of what could happen, // but we don't do anything special with them here. if (e.error == DropboxServerException._304_NOT_MODIFIED) { // won't happen since we don't pass in revision with metadata } else if (e.error == DropboxServerException._401_UNAUTHORIZED) { // Unauthorized, so we should unlink them. You may want to // automatically log the user out in this case. } else if (e.error == DropboxServerException._403_FORBIDDEN) { // Not allowed to access this } else if (e.error == DropboxServerException._404_NOT_FOUND) { // path not found (or if it was the thumbnail, can't be // thumbnailed) } else if (e.error == DropboxServerException._406_NOT_ACCEPTABLE) { // too many entries to return } else if (e.error == DropboxServerException._415_UNSUPPORTED_MEDIA) { // can't be thumbnailed } else if (e.error == DropboxServerException._507_INSUFFICIENT_STORAGE) { // user is over quota } else { // Something else } // This gets the Dropbox error, translated into the user's language mErrorMsg = e.body.userError; if (mErrorMsg == null) { mErrorMsg = e.body.error; } } catch (DropboxIOException e) { // Happens all the time, probably want to retry automatically. mErrorMsg = "Network error. Try again."; } catch (DropboxParseException e) { // Probably due to Dropbox server restarting, should retry mErrorMsg = "Dropbox error. Try again."; } catch (DropboxException e) { // Unknown error mErrorMsg = "Unknown error. Try again."; } return false; } @Override protected void onProgressUpdate(Long... progress) { int percent = (int)(100.0*(double)progress[0]/mFileLen + 0.5); mDialog.setProgress(percent); } @Override protected void onPostExecute(Boolean result) { mDialog.dismiss(); if (result) { // Set the image now that we have it mView.setImageDrawable(mDrawable); } else { // Couldn't download it, so show an error showToast(mErrorMsg); } } private void showToast(String msg) { Toast error = Toast.makeText(mContext, msg, Toast.LENGTH_LONG); error.show(); } }