i need to download multiple images when my application starts up. I'm able to download the images properly but the problem im facing is how do i perform a task like move to another activity(where the pics are displayed) or in this case( for testing purposes) change the text of a textview once ALL the downloads are complete. In my code it changes the text view even if one download is complete,which is not what i want. How do i achieve this?
public class MainActivity extends ActionBarActivity {
TextView testtv;
String[] imagenames;
String BASEURL;
private long enqueue;
private DownloadManager dm = null;
@TargetApi(Build.VERSION_CODES.GINGERBREAD)
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
BASEURL = getResources().getString(R.string.base_URL);
imagenames = getResources().getStringArray(R.array.pic_name);
testtv = (TextView) findViewById(R.id.testtv);
File Path = getExternalFilesDir(null);
File noMedia = new File(Path + "/.nomedia");
if (!noMedia.exists()) {
try {
noMedia.createNewFile();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
Path.mkdirs();
for (int index = 0; index < imagenames.length; index++) {
File image = new File(Path + "/" + imagenames[index]);
if (image.exists()) {
testtv.setText("file exists");
} else {
Boolean result = isDownloadManagerAvailable(getApplicationContext());
if (result) {
downloadFile(imagenames[index]);
}
}
}
}
@SuppressLint("NewApi")
public void downloadFile(String imagename) {
// TODO Auto-generated method stub
String DownloadUrl = BASEURL + imagename;
DownloadManager.Request request = new DownloadManager.Request(
Uri.parse(DownloadUrl));
request.setDescription("P3 Resources"); // appears the same
// in Notification
// bar while
// downloading
request.setTitle("P3 Resources");
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
request.allowScanningByMediaScanner();
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE);
}
String fileName = DownloadUrl.substring(
DownloadUrl.lastIndexOf('/') + 1, DownloadUrl.length());
request.setDestinationInExternalFilesDir(getApplicationContext(), null,
fileName);
// get download service and enqueue file
dm = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);
enqueue = dm.enqueue(request);
}
public static boolean isDownloadManagerAvailable(Context context) {
try {
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.GINGERBREAD) {
return false;
}
Intent intent = new Intent(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_LAUNCHER);
intent.setClassName("com.android.providers.downloads.ui",
"com.android.providers.downloads.ui.DownloadList");
List<ResolveInfo> list = context.getPackageManager()
.queryIntentActivities(intent,
PackageManager.MATCH_DEFAULT_ONLY);
return list.size() > 0;
} catch (Exception e) {
return false;
}
}
private BroadcastReceiver receiver = new BroadcastReceiver() {
@TargetApi(Build.VERSION_CODES.GINGERBREAD)
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (DownloadManager.ACTION_DOWNLOAD_COMPLETE.equals(action)) {
long downloadId = intent.getLongExtra(
DownloadManager.EXTRA_DOWNLOAD_ID, 0);
Query query = new Query();
query.setFilterById(enqueue);
Cursor c = dm.query(query);
if (c.moveToFirst()) {
int columnIndex = c
.getColumnIndex(DownloadManager.COLUMN_STATUS);
if (DownloadManager.STATUS_SUCCESSFUL == c
.getInt(columnIndex)) {
testtv.setText("Download Complete");
}
}
}
}
};
@TargetApi(Build.VERSION_CODES.GINGERBREAD)
public void onResume() {
super.onResume();
registerReceiver(receiver, new IntentFilter(
DownloadManager.ACTION_DOWNLOAD_COMPLETE));
}
}
You're currently only storing the last id returned from the DL manager. Changed this to a thread-safe queue - that should fix it if I understand your use can correctly.
public class MainActivity extends ActionBarActivity {
TextView testtv;
String[] imagenames;
String BASEURL;
private Queue<Long> enqueue = new ConcurrentLinkedQueue<>();
private DownloadManager dm = null;
@TargetApi(Build.VERSION_CODES.GINGERBREAD)
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
BASEURL = getResources().getString(R.string.base_URL);
imagenames = getResources().getStringArray(R.array.pic_name);
testtv = (TextView) findViewById(R.id.testtv);
File Path = getExternalFilesDir(null);
File noMedia = new File(Path + "/.nomedia");
if (!noMedia.exists()) {
try {
noMedia.createNewFile();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
Path.mkdirs();
for (int index = 0; index < imagenames.length; index++) {
File image = new File(Path + "/" + imagenames[index]);
if (image.exists()) {
testtv.setText("file exists");
} else {
Boolean result = isDownloadManagerAvailable(getApplicationContext());
if (result) {
downloadFile(imagenames[index]);
}
}
}
}
@SuppressLint("NewApi")
public void downloadFile(String imagename) {
// TODO Auto-generated method stub
String DownloadUrl = BASEURL + imagename;
DownloadManager.Request request = new DownloadManager.Request(
Uri.parse(DownloadUrl));
request.setDescription("P3 Resources"); // appears the same
// in Notification
// bar while
// downloading
request.setTitle("P3 Resources");
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
request.allowScanningByMediaScanner();
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE);
}
String fileName = DownloadUrl.substring(
DownloadUrl.lastIndexOf('/') + 1, DownloadUrl.length());
request.setDestinationInExternalFilesDir(getApplicationContext(), null,
fileName);
// get download service and enqueue file
dm = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);
enqueue.offer(dm.enqueue(request));
}
public static boolean isDownloadManagerAvailable(Context context) {
try {
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.GINGERBREAD) {
return false;
}
Intent intent = new Intent(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_LAUNCHER);
intent.setClassName("com.android.providers.downloads.ui",
"com.android.providers.downloads.ui.DownloadList");
List<ResolveInfo> list = context.getPackageManager()
.queryIntentActivities(intent,
PackageManager.MATCH_DEFAULT_ONLY);
return list.size() > 0;
} catch (Exception e) {
return false;
}
}
private BroadcastReceiver receiver = new BroadcastReceiver() {
@TargetApi(Build.VERSION_CODES.GINGERBREAD)
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (DownloadManager.ACTION_DOWNLOAD_COMPLETE.equals(action)) {
long downloadId = intent.getLongExtra(
DownloadManager.EXTRA_DOWNLOAD_ID, 0);
if (enqueue.contains(downloadId)) {
enqueue.remove(downloadId);
}
if (!enqueue.isEmpty()) {
return;
}
//not waiting on any more downloads
testtv.setText("Downloads Complete");
}
}
};
@TargetApi(Build.VERSION_CODES.GINGERBREAD)
public void onResume() {
super.onResume();
registerReceiver(receiver, new IntentFilter(
DownloadManager.ACTION_DOWNLOAD_COMPLETE));
}
}