Android Open Source - dropbox-android-sdk Download Random Picture






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License

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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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Java Source Code

/*
 * Copyright (c) 2010-11 Dropbox, Inc./*from   ww w.  j av a2s  .c  o m*/
 *
 * 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();
    }


}




Java Source Code List

.CopyBetweenAccounts.java
.SearchCache.java
com.dropbox.android.sample.DBRoulette.java
com.dropbox.android.sample.DownloadRandomPicture.java
com.dropbox.android.sample.UploadPicture.java
com.dropbox.client2.DropboxAPI.java
com.dropbox.client2.ProgressListener.java
com.dropbox.client2.RESTUtility.java
com.dropbox.client2.SdkVersion.java
com.dropbox.client2.SecureSSLSocketFactory.java
com.dropbox.client2.android.AndroidAuthSession.java
com.dropbox.client2.android.AuthActivity.java
com.dropbox.client2.exception.DropboxException.java
com.dropbox.client2.exception.DropboxFileSizeException.java
com.dropbox.client2.exception.DropboxIOException.java
com.dropbox.client2.exception.DropboxLocalStorageFullException.java
com.dropbox.client2.exception.DropboxParseException.java
com.dropbox.client2.exception.DropboxPartialFileException.java
com.dropbox.client2.exception.DropboxProxyChangeException.java
com.dropbox.client2.exception.DropboxSSLException.java
com.dropbox.client2.exception.DropboxServerException.java
com.dropbox.client2.exception.DropboxUnlinkedException.java
com.dropbox.client2.jsonextract.JsonBase.java
com.dropbox.client2.jsonextract.JsonExtractionException.java
com.dropbox.client2.jsonextract.JsonExtractor.java
com.dropbox.client2.jsonextract.JsonList.java
com.dropbox.client2.jsonextract.JsonMap.java
com.dropbox.client2.jsonextract.JsonThing.java
com.dropbox.client2.session.AbstractSession.java
com.dropbox.client2.session.AccessTokenPair.java
com.dropbox.client2.session.AppKeyPair.java
com.dropbox.client2.session.RequestTokenPair.java
com.dropbox.client2.session.Session.java
com.dropbox.client2.session.TokenPair.java
com.dropbox.client2.session.WebAuthSession.java
com.dropbox.client2.session.WebOAuth2Session.java