Develop Reference

Restart a Fragment

I'm having an issue restarting the fragment in my Activity. When the user completes a round, I need the fragment that is implemented by the activity to completely restart. The fragment has an if / else statement that checks to see if a round has already been played, and if so, it needs to reload the fragment with alternative values. I've been looking all over and can't seem to find much of anything on this, so any help is much appreciated!
public class BoardActivity extends Activity implements BoardFragment.OnFragmentInteractionListener {
public void gameTimer() {
Timer t = new Timer();
t.scheduleAtFixedRate(new TimerTask() {
#Override
public void run() {
runOnUiThread(new Runnable() {
#Override
public void run() {
TextView tv = (TextView) findViewById(R.id.RoundTimer);
tv.setText(String.valueOf(minutes) + ":" + String.valueOf(seconds) + ":" + String.valueOf(milliseconds));
milliseconds -= 1;
if (milliseconds == 0) {
tv.setText(String.valueOf(minutes) + ":" + String.valueOf(seconds) + ":" + String.valueOf(milliseconds));
milliseconds = 1000;
seconds = seconds - 1;
}
if (seconds == 0) {
timerout = "Out of Time!";
tv.setText(String.valueOf(timerout));
}
if (timerout == "Out of Time!") {
Model.gameCounter = Model.gameCounter + 1;
nextRound();
}
}
});
}
}, 0, 1);
}
private void nextRound(){
//redirect to next round
if (Model.gameCounter <= 1 && Model.gameCounter < 4) {
Log.d(TAG,"new round");
Fragment frg = null;
frg = getFragmentManager().findFragmentByTag("BoardFragment");
final FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.detach(frg);
ft.attach(frg);
ft.commit();
} else {
//eventually add score screen
Log.d(TAG,"same round");
}
}

The documentation on attach and detach does say that the view hierarchy get destroyed and rebuilt. However, the state of the views is maintained, and so it should be expected to seem as if nothing has happened (which it sounds like what you are seeing). The docs say it is the same thing that happens when the fragment goes on the back stack.
Thus I think you have two options for "restarting" the fragment.
Option 1: Create a new fragment each time.
private void nextRound(){
//redirect to next round
if (Model.gameCounter <= 1 && Model.gameCounter < 4) {
Log.d(TAG,"new round");
Fragment frg = null;
frg = getFragmentManager().findFragmentByTag("BoardFragment");
Fragment newfrg = new BoardFragment();
final FragmentTransaction ft = getFragmentManager().beginTransaction();
if (frg == null) {
ft.add(R.id.board_container, newfrg, "BoardFragment");
} else {
ft.replace(R.id.board_container, newfrg, "BoardFragment");
}
ft.commit();
} else {
//eventually add score screen
Log.d(TAG,"same round");
}
}
Option 2: Write a method in BoardFragment to reset the board for the next round, and call that when you are restarting.
private void nextRound(){
//redirect to next round
if (Model.gameCounter <= 1 && Model.gameCounter < 4) {
Log.d(TAG,"new round");
BoardFragment frg = (BoardFragment)
getFragmentManager().findFragmentByTag("BoardFragment");
frg.restart();
} else {
//eventually add score screen
Log.d(TAG,"same round");
}
}

parse.com calling .save() causes all queries to stop working Android

I have two objects, a establishment object that belongs to a deal object that can be voted upon. If I up/down vote the same deal multiple times, the seventh time I vote the query just sits and does not do anything. The app does not crash, but it also does not save. If I go into another activity that requires a parse.com query that query also will not work. Here is my up vote logic (down voting is identical).
Assume all vars used are initialized before onCreate().
Are my queries getting backed up in a pipe somewhere?
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
upVoteButton = (Button) findViewById(R.id.deal_up_vote_button);
upVoteButton.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
new UpVoteTask().execute();
}
});
}
// visually changes buttons if they are selected
private void setButtons(Boolean queryDb) {
if (queryDb == true) {
queryParse();
}
// if deal found correctly
if (deal != null) {
// if user found correctly
if (dealVoteUser != null) {
if (dealVoteUser.get("vote").toString().equals("0")) {
upVoteButton.setPressed(false);
downVoteButton.setPressed(true);
} else if (dealVoteUser.get("vote").toString().equals("1")) {
upVoteButton.setPressed(true);
downVoteButton.setPressed(false);
} else if (dealVoteUser.get("vote").toString().equals("2")) {
upVoteButton.setPressed(false);
downVoteButton.setPressed(false);
}
}
}
}
// queries parse and populates vars
private void queryParse(){
ParseQuery<ParseObject> queryDeal = ParseQuery.getQuery("Deal");
queryDeal.whereEqualTo("objectId", deal_id);
try {
deal = queryDeal.getFirst();
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
ParseQuery<ParseObject> queryDealVoteUser = ParseQuery
.getQuery("deal_vote_users");
queryDealVoteUser.whereEqualTo("deal", deal).whereEqualTo("user",
ParseUser.getCurrentUser());
try {
dealVoteUser = queryDealVoteUser.getFirst();
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
// UpVoteTask AsyncTask
private class UpVoteTask extends AsyncTask<Void, Void, Void> {
#Override
protected void onPreExecute() {
super.onPreExecute();
// Create a progressdialog
if(upVoteProgressDialog != null){
upVoteProgressDialog.dismiss();
upVoteProgressDialog = null;
}
upVoteProgressDialog = new ProgressDialog(DealsDetailsActivity.this);
// Set progressdialog message
upVoteProgressDialog.setMessage("Saving...");
upVoteProgressDialog.setIndeterminate(false);
// Show progressdialog
upVoteProgressDialog.show();
}
#Override
protected Void doInBackground(Void... params) {
queryParse();
// if deal found correctly
if (deal != null) {
// if user has not voted yet
if (dealVoteUser == null) {
// create new and assign vote to 1
dealVoteUser = new ParseObject("deal_vote_users");
dealVoteUser.put("deal", deal);
dealVoteUser.put("user", ParseUser.getCurrentUser());
dealVoteUser.put("vote", 1);
up_votes = deal.getInt("up_votes") + 1;
down_votes = deal.getInt("down_votes");
// if user already down voted
} else if (dealVoteUser.get("vote").toString().equals("0")) {
// change vote to 1
dealVoteUser.put("vote", 1);
up_votes = deal.getInt("up_votes") + 1;
down_votes = deal.getInt("down_votes") - 1;
// if user already up voted
} else if (dealVoteUser.get("vote").toString().equals("1")) {
// already voted up, remove vote
dealVoteUser.put("vote", 2);
up_votes = deal.getInt("up_votes") - 1;
down_votes = deal.getInt("down_votes");
// if user already voted but cleared vote
} else if (dealVoteUser.get("vote").toString().equals("2")) {
// change vote to 1
dealVoteUser.put("vote", 1);
up_votes = deal.getInt("up_votes") + 1;
down_votes = deal.getInt("down_votes");
}
// calculate overall rating percentage
if ((up_votes + down_votes) != 0) {
rating = (up_votes / (up_votes + down_votes)) * 100;
} else if ((up_votes == 0) && (down_votes == 0)) {
rating = 0;
} else {
rating = 50;
}
deal.put("rating", rating);
deal.put("up_votes", up_votes);
try {
deal.save();
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
dealVoteUser.save();
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} else {
// deal not found problem
}
return null;
}
#Override
protected void onPostExecute(Void result) {
// visually change buttons without querying db
setButtons(false);
//remove progress dialogue
if(upVoteProgressDialog != null){
upVoteProgressDialog.dismiss();
upVoteProgressDialog = null;
}
}
}

Use the saveInBackground method - it will do the same as save, but also save it to your application's cache so that you won't get different values while the data is being saved, so it won't have any apparent effect on your application. It's the best method to save or find (it has a 'sister' method named findInBackground). It acts like an Async task and does not clog your main thread.

I switched all parse calls over to ._____InBackground() and I moved the save logic to onPause(). This way I am not making multiple save calls to parse if the user decides to change their vote multiple times.

Reading from a server in a list/details Fragment in Android

I'm using this code/concept :
Android Fragments
What I am wanting to achieve is, on item selected (as seen below), I want to send the item to the server, have it process on that side (which I can do) and retrieve the String that is sent back and use that string to update the details part of the list/details fragment. Is there anyone that help me in achieving this through some code?
My code so far is as follows:
public class MainActivity extends FragmentActivity implements HeadlinesFragment.OnHeadlineSelectedListener
{
XMLCreator x = new XMLCreator();
/** Called when the activity is first created. */
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.news_articles);
// Check whether the activity is using the layout version with
// the fragment_container FrameLayout. If so, we must add the first fragment
if (findViewById(R.id.fragment_container) != null)
{
// However, if we're being restored from a previous state,
// then we don't need to do anything and should return or else
// we could end up with overlapping fragments.
if (savedInstanceState != null)
{
return;
}
// Create an instance of ExampleFragment
HeadlinesFragment firstFragment = new HeadlinesFragment();
// In case this activity was started with special instructions from an Intent,
// pass the Intent's extras to the fragment as arguments
firstFragment.setArguments(getIntent().getExtras());
// Add the fragment to the 'fragment_container' FrameLayout
getSupportFragmentManager().beginTransaction()
.add(R.id.fragment_container, firstFragment).commit();
}
postToServer();
}
public void postToServer()
{
new Connection().execute();
}
public void onArticleSelected(int position)
{
// The user selected the headline of an article from the HeadlinesFragment
// Capture the article fragment from the activity layout
ArticleFragment articleFrag = (ArticleFragment)getSupportFragmentManager().findFragmentById(R.id.article_fragment);
if (articleFrag != null)
{
// If article frag is available, we're in two-pane layout...
// Call a method in the ArticleFragment to update its content
String Day = "";
Day = Ipsum.Headlines[position];
Document doc;
try
{
doc = x.createDoc();
Element tutor = doc.createElement("Query");
tutor.appendChild(x.createDay(doc, Day, "GetSessionByDay"));
doc.appendChild(tutor);
String s = x.getStringFromDocument(doc);
//connection.sendData(s);
//Want to send and receive strings here
}
catch (Exception e)
{
e.printStackTrace();
}
articleFrag.updateArticleView(position);
}
else
{
// If the frag is not available, we're in the one-pane layout and must swap frags...
// Create fragment and give it an argument for the selected article
ArticleFragment newFragment = new ArticleFragment();
Bundle args = new Bundle();
args.putInt(ArticleFragment.ARG_POSITION, position);
newFragment.setArguments(args);
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
// Replace whatever is in the fragment_container view with this fragment,
// and add the transaction to the back stack so the user can navigate back
transaction.replace(R.id.fragment_container, newFragment);
transaction.addToBackStack(null);
// Commit the transaction
transaction.commit();
}
}
public class Connection extends AsyncTask<Void, Void, String>
{
// the I/O streams that will be receiving/sending data from/to the
// server
private ObjectOutputStream output;
private ObjectInputStream input;
private String message = "";
private Socket client;
#Override
protected void onPreExecute()
{
// IMPORTANT: this method is synched with UI thread, so can access UI
super.onPreExecute();
}
#Override
protected String doInBackground(Void... params)
{
try
{
client = new Socket("10.111.1.1", 5001);
} catch (UnknownHostException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
try {
output = new ObjectOutputStream(client.getOutputStream());
output.flush();
input = new ObjectInputStream(client.getInputStream());
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
do
{
try
{
message = (String) input.readObject();
}
catch (ClassNotFoundException classNotFoundException)
{
} catch (OptionalDataException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
while (!message.equals("SERVER>>> TERMINATE"));
try
{
output.writeObject(message);
output.flush();
} catch (IOException ioException)
{
}
// sleep a bit, so this task isn't over before it starts
try
{
Thread.sleep(500);
} catch (InterruptedException e)
{
Log.e("TASK", "Error sleeping in CalculateTask");
}
// return value to be passed to onPostExecute of task initiator
return message;
}
#Override
protected void onProgressUpdate(Void... progress)
{
// IMPORTANT: this method is synched with UI thread, so can access UI
}
#Override
protected void onPostExecute(String result)
{
// IMPORTANT: this method is synched with UI thread, so can access UI
super.onPostExecute(result);
// update UI
}
}
}

Just call to server from your Fragment, like method getData(), inside that, I think you have to implement AsynkTask. When you get response of that request in DoInBackground(), just pass that to onPostExecute() and use that response and update your UI whatever you want.

Create a method postToServer() in the MainActivity to execute the AsyncTask. Call this method inside the OnItemClickListner in the fragment
((MainActivity)getActivity).postToServer();
In the Fragment, create a method updateUI(String response) which handles the UI updating and call this method from your parent Activity when the AsyncTask is finished. Call this method in the OnPostExecute() of the AsyncTask;

isCancelled() not Working in android Async Task

I want to cancel a downloading file using async task, i tried below code, here isCancelled() method is not working, can any one suggest how can i stop download.
vid1.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
down d1=new down();
if(vid1.getText().toString().equals("Start")){
Log.v("Vid 1", "Vid 1");
vid1.setText("Pause");
d1.execute(url1,"one");
}else if(vid1.getText().toString().equals("Pause")){
vid1.setText("Start");
Log.v("Vid 1 Else", "Vid 1 Else");
if(d1!=null && d1.getStatus()!=AsyncTask.Status.FINISHED){
d1.cancel(true);
}
}
}
});
vid2.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Log.v("Vid 2", "Vid 2");
// TODO Auto-generated method stub
down d2=new down();
if(vid2.getText().toString().equals("Start")){
vid2.setText("Pause");
d2.execute(url2,"two");
}else if(vid2.getText().toString().equals("Pause")){
vid2.setText("Start");
Log.v("Vid 2 Else", "Vid 2 Else ");
d2.cancel(true);
}
}
});
}
private class down extends AsyncTask<String, Void, String>{
RandomAccessFile output ;
boolean cancel=false;
#Override
protected void onPreExecute() {
// TODO Auto-generated method stub
Log.v("Pre Execute", "Pre Execute");
}
#Override
protected String doInBackground(String... params) {
// TODO Auto-generated method stub
File outputFileCache=new File(Environment.getExternalStorageDirectory()+"/pau/"+params[1]+".mp4");
try {
Long download_ok = null ;
int fileLength;
URL url = new URL(params[0]);
HttpURLConnection connection = (HttpURLConnection) url.openConnection() ;
if (outputFileCache.exists())
{
Log.v(">>>>>>", "Exists");
connection.setAllowUserInteraction(true);
connection.setRequestProperty("Range", "bytes=" + outputFileCache.length() + "-");
}
connection.setConnectTimeout(14000);
connection.setReadTimeout(20000);
connection.connect();
if (connection.getResponseCode() / 100 != 2)
throw new Exception("Invalid response code!");
else
{
String connectionField = connection.getHeaderField("content-range");
if (connectionField != null)
{
String[] connectionRanges = connectionField.substring("bytes=".length()).split("-");
download_ok = Long.valueOf(connectionRanges[0]);
Log.v("download ok", ""+download_ok);
}
if (connectionField == null && outputFileCache.exists())
outputFileCache.delete();
if(download_ok==null){
download_ok=(long) 0;
}
fileLength = (int) (connection.getContentLength() + download_ok);
Log.v("file length", ""+fileLength);
input = new BufferedInputStream(connection.getInputStream());
output = new RandomAccessFile(outputFileCache, "rw");
output.seek(download_ok);
byte data[] = new byte[1024];
int count = 0;
int __progress = 0;
while ((count = input.read(data, 0, 1024)) != -1 && __progress!=100)
{
Log.v(">>>>>>>>>>>progress cancelled", "<<<<<<<<<"+isCancelled());
if(isCancelled()){
Log.v(">>>>>>>>>>>>>>>>>>>>>>>>>>>", "<<<<<<<<<"+isCancelled());
break;
}else{
download_ok += count;
output.write(data, 0, count);
__progress = (int) ((download_ok * 100) / fileLength);
}
}
output.close();
input.close();
}
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(String result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
}

Found your problem: You are creating a new instance of the Asynctask with every click, e.g.
down d2=new down();
This means that you are calling cancel on a different AsyncTask object. You need to move this line into your check for the start click and also use a field and not a local variable i.e.
if(vid2.getText().toString().equals("Start")) {
d2 = new down();
vid2.setText("Pause");
d2.execute(url2,"two");
}
where d2 is set in your class. Also note that class names should always start with capital letters, i.e. class Down instead of class down.
EDIT
You can store the Asynctask in a global class array that is equal in length to the number of videos.
Down downTasks[] = new Down[TOTAL VIDEOS];
Then you initialise the Views, similar to what you already did, here shown for one View
vid1.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
if(vid1.getText().toString().equals("Start")){
Log.v("Vid 1", "Vid 1");
vid1.setText("Pause");
downTasks[0] = new down();
downTasks[0].execute(url1,"one");
}
else if(vid1.getText().toString().equals("Pause")){
vid1.setText("Start");
Log.v("Vid 1 Else", "Vid 1 Else");
if(downTasks[0]!=null && downTasks[0].getStatus()!=AsyncTask.Status.FINISHED){
downTasks[0].cancel(true);
}
}
}
});
Note that this code is quite redundant because you rewrite almost exactly the same code for every View, this can be nicely refactored with a for loop, but I leave that as an exercise for you if you feel like it.

How to do google inapp purchase in an adapter class

I am developing an app which has google in app purchase. There is a button buy now and after clicking the button I have to call inapp purchase but here is the problem I am facing, the buy now button is in an adapter class hence how can I do inapp purchase in an adapter class
here is my code
public void onClick(View v) {
switch (v.getId()) {
case R.id.loadmore_btn:
// call a url with ofset & limit with Thread
if (getbookItems.getContentName() == "LoadMore") {
booksItemsInfo.remove(booksItemsInfo.size() - 1);
}
if (UIAndDataLoader.offset < bookcategoryItem.getCount()) {
if (UIAndDataLoader.offset < DBTotalContentCount) {
UIAndDataLoader.offset = UIAndDataLoader.offset + 10;
UIAndDataLoader.loadFlag = 0;
myActivity.Tostart();
} else {
myActivity.URLConfig = MagURLConfig.bURL
+ MagURLConfig.uMAILIDNAME
+ _Settings.getString("setEmail-ID", null)
+ MagURLConfig.uPASSWORD
+ _Settings.getString("setPassword", null)
+ MagURLConfig.CATEGORYID
+ bookcategoryItem.getCatId() + MagURLConfig.OFFSET
+ DBTotalContentCount + MagURLConfig.LIMIT;
UIAndDataLoader.bookcountlimit = 1;
myActivity.toStartRefresh(true);
}
}
break;
case R.id.btn_buynow:
// System.out.println("this is buy btn------------->");
BookDataLoader.ActionButtonOnclick(btn_txt, action_btn,
getbookItems, "");
break;
case R.id.preview:
BookDataLoader.ActionButtonOnclick(btn_txt, action_btn,
getbookItems, "Preview");
break;
}
}
}

You can declare the adapter class in the same activity.thats why you can user mHelper object.
I done the same functionality in one of application for in puchase item.
like:-
holder.relative_layout_btn_buy.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
try {
if(isOnline())
mHelper.launchPurchaseFlow(OnlineStoreList.this,"android.test.purchased",RC_REQUEST,mPurchaseFinishedListener, "");
else
{
NetworkAlert();
}
} catch (Exception e) {
// Toast.makeText(getApplicationContext(),"Please wait...Try after some time!! " ,1).show();
Log.e("Exception", "===>" + e.toString());
complain(e.getMessage());
}
}
});
I hope with will help.Thanks!!