fdroidclient / F-Droid / src / org / fdroid / fdroid / net / AsyncDownloaderFromAndroid.java @ d0d287f6
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package org.fdroid.fdroid.net; |
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import android.annotation.TargetApi; |
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import android.app.DownloadManager; |
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import android.content.BroadcastReceiver; |
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import android.content.Context; |
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import android.content.Intent; |
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import android.content.IntentFilter; |
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import android.database.Cursor; |
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import android.net.Uri; |
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import android.os.Build; |
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import android.os.ParcelFileDescriptor; |
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import java.io.File; |
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import java.io.FileDescriptor; |
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import java.io.FileInputStream; |
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import java.io.FileOutputStream; |
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import java.io.IOException; |
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import java.io.InputStream; |
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import java.io.OutputStream; |
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/**
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* A downloader that uses Android's DownloadManager to perform a download.
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*/
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@TargetApi(Build.VERSION_CODES.GINGERBREAD)
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public class AsyncDownloaderFromAndroid extends AsyncDownloader { |
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private final Context context; |
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private final DownloadManager dm; |
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private File localFile; |
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private String remoteAddress; |
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private String appName; |
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private String appId; |
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private Listener listener;
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private long downloadId = -1; |
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/**
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* Normally the listener would be provided using a setListener method.
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* However for the purposes of this async downloader, it doesn't make
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* sense to have an async task without any way to notify the outside
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* world about completion. Therefore, we require the listener as a
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* parameter to the constructor.
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*/
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public AsyncDownloaderFromAndroid(Context context, Listener listener, String appName, String appId, String remoteAddress, File localFile) { |
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super(null, listener); |
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this.context = context;
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this.appName = appName;
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this.appId = appId;
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this.remoteAddress = remoteAddress;
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this.listener = listener;
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this.localFile = localFile;
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if (appName == null || appName.trim().length() == 0) { |
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this.appName = remoteAddress;
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} |
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dm = (DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE);
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} |
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@Override
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public void download() { |
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// Check if the download is complete
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if ((downloadId = isDownloadComplete(context, appId)) > 0) { |
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// clear the notification
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dm.remove(downloadId); |
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try {
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// write the downloaded file to the expected location
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ParcelFileDescriptor fd = dm.openDownloadedFile(downloadId); |
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copyFile(fd.getFileDescriptor(), localFile); |
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listener.onDownloadComplete(); |
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} catch (IOException e) { |
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listener.onErrorDownloading(e.getLocalizedMessage()); |
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} |
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return;
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} |
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// Check if the download is still in progress
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if (downloadId < 0) { |
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downloadId = isDownloading(context, appId); |
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} |
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// Start a new download
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if (downloadId < 0) { |
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// set up download request
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DownloadManager.Request request = new DownloadManager.Request(Uri.parse(remoteAddress));
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request.setTitle(appName); |
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request.setDescription(appId); // we will retrieve this later from the description field
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this.downloadId = dm.enqueue(request);
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} |
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context.registerReceiver(receiver, |
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new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));
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} |
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/**
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* Copy input file to output file
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* @throws IOException
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*/
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private void copyFile(FileDescriptor inputFile, File outputFile) throws IOException { |
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InputStream is = new FileInputStream(inputFile); |
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OutputStream os = new FileOutputStream(outputFile); |
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byte[] buffer = new byte[1024]; |
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int count = 0; |
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try {
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while ((count = is.read(buffer, 0, buffer.length)) > 0) { |
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os.write(buffer, 0, count);
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} |
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} finally {
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os.close(); |
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is.close(); |
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} |
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} |
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@Override
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public int getBytesRead() { |
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if (downloadId < 0) return 0; |
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DownloadManager.Query query = new DownloadManager.Query();
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query.setFilterById(downloadId); |
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Cursor c = dm.query(query);
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try {
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if (c.moveToFirst()) {
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// we use the description column to store the app id
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int columnIndex = c.getColumnIndex(DownloadManager.COLUMN_BYTES_DOWNLOADED_SO_FAR);
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return c.getInt(columnIndex);
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} |
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} finally {
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c.close(); |
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} |
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return 0; |
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} |
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@Override
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public int getTotalBytes() { |
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if (downloadId < 0) return 0; |
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DownloadManager.Query query = new DownloadManager.Query();
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query.setFilterById(downloadId); |
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Cursor c = dm.query(query);
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try {
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if (c.moveToFirst()) {
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// we use the description column to store the app id
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int columnIndex = c.getColumnIndex(DownloadManager.COLUMN_TOTAL_SIZE_BYTES);
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return c.getInt(columnIndex);
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} |
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} finally {
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c.close(); |
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} |
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return 0; |
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} |
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@Override
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public void attemptCancel(boolean userRequested) { |
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try {
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context.unregisterReceiver(receiver); |
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} catch (Exception e) { |
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// ignore if receiver already unregistered
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} |
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if (userRequested && downloadId >= 0) { |
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dm.remove(downloadId); |
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} |
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} |
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/**
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* Extract the appId from a given download id.
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* @return - appId or null if not found
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*/
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public static String getAppId(Context context, long downloadId) { |
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DownloadManager dm = (DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE);
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DownloadManager.Query query = new DownloadManager.Query();
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query.setFilterById(downloadId); |
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Cursor c = dm.query(query);
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try {
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if (c.moveToFirst()) {
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// we use the description column to store the app id
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int columnIndex = c.getColumnIndex(DownloadManager.COLUMN_DESCRIPTION);
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return c.getString(columnIndex);
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} |
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} finally {
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c.close(); |
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} |
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return null; |
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} |
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/**
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* Extract the download title from a given download id.
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* @return - title or null if not found
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*/
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public static String getDownloadTitle(Context context, long downloadId) { |
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DownloadManager dm = (DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE);
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DownloadManager.Query query = new DownloadManager.Query();
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query.setFilterById(downloadId); |
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Cursor c = dm.query(query);
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try {
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if (c.moveToFirst()) {
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// we use the description column to store the app id
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int columnIndex = c.getColumnIndex(DownloadManager.COLUMN_TITLE);
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return c.getString(columnIndex);
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} |
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} finally {
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c.close(); |
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} |
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return null; |
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} |
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/**
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* Get the downloadId from an Intent sent by the DownloadManagerReceiver
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*/
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public static long getDownloadId(Intent intent) { |
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if (intent != null) { |
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if (intent.hasExtra(DownloadManager.EXTRA_DOWNLOAD_ID)) {
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// we have been passed a DownloadManager download id, so get the app id for it
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return intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, -1); |
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} |
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if (intent.hasExtra(DownloadManager.EXTRA_NOTIFICATION_CLICK_DOWNLOAD_IDS)) {
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// we have been passed multiple download id's - just return the first one
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long[] downloadIds = intent.getLongArrayExtra(DownloadManager.EXTRA_NOTIFICATION_CLICK_DOWNLOAD_IDS); |
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if (downloadIds != null && downloadIds.length > 0) { |
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return downloadIds[0]; |
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} |
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} |
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} |
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return -1; |
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} |
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/**
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* Check if a download is running for the app
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* @return -1 if not downloading, else the downloadId
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*/
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public static long isDownloading(Context context, String appId) { |
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DownloadManager dm = (DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE);
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DownloadManager.Query query = new DownloadManager.Query();
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Cursor c = dm.query(query);
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int columnAppId = c.getColumnIndex(DownloadManager.COLUMN_DESCRIPTION);
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int columnId = c.getColumnIndex(DownloadManager.COLUMN_ID);
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try {
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while (c.moveToNext()) {
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if (appId.equals(c.getString(columnAppId))) {
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return c.getLong(columnId);
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} |
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} |
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} finally {
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c.close(); |
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} |
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return -1; |
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} |
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/**
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* Check if a download for an app is complete.
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* @return -1 if download is not complete, otherwise the download id
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*/
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public static long isDownloadComplete(Context context, String appId) { |
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DownloadManager dm = (DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE);
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DownloadManager.Query query = new DownloadManager.Query();
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query.setFilterByStatus(DownloadManager.STATUS_SUCCESSFUL); |
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Cursor c = dm.query(query);
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int columnAppId = c.getColumnIndex(DownloadManager.COLUMN_DESCRIPTION);
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int columnId = c.getColumnIndex(DownloadManager.COLUMN_ID);
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try {
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while (c.moveToNext()) {
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if (appId.equals(c.getString(columnAppId))) {
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return c.getLong(columnId);
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} |
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} |
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} finally {
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c.close(); |
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} |
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return -1; |
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} |
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/**
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* Broadcast receiver to listen for ACTION_DOWNLOAD_COMPLETE broadcasts
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*/
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BroadcastReceiver receiver = new BroadcastReceiver() {
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@Override
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public void onReceive(Context context, Intent intent) { |
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if (DownloadManager.ACTION_DOWNLOAD_COMPLETE.equals(intent.getAction())) {
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long dId = getDownloadId(intent);
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String appId = getAppId(context, dId);
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if (listener != null && dId == downloadId && appId != null) { |
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// our current download has just completed, so let's throw up install dialog
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// immediately
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try {
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context.unregisterReceiver(receiver); |
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} catch (Exception e) { |
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// ignore if receiver already unregistered
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} |
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// call download() to copy the file and start the installer
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download(); |
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} |
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} |
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} |
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}; |
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} |