Develop Reference

MultipartEntityBuilder on API 22

I want to upload an image to server but i need to send 2 more things in order to connect with the server any HELP cause im really stuck on this one.
MultipartEntityBuilder builder = MultipartEntityBuilder.create();
// MultipartEntity entity = new MultipartEntity();
try {
File file = new File(path);
// Adding file data to http body
builder.addPart("image", new FileBody(file));
// Extra parameters if you want to pass to server
builder.addTextBody("confid", name);
builder.addTextBody("udid", id);
entity = builder.build();
httppost.setEntity(entity);
// Making server call
HttpResponse response = httpclient.execute(httppost);
HttpEntity r_entity = response.getEntity();
int statusCode = response.getStatusLine().getStatusCode();
if (statusCode == 200) {
// Server response
responseString = EntityUtils.toString(r_entity);
} else {
responseString = "Error occurred! Http Status Code: "
+ statusCode;
}
} catch (ClientProtocolException e) {
responseString = e.toString();
} catch (IOException e) {
responseString = e.toString();
}
return responseString;
}
Here are the errors from android Studio logcat
0-08 12:06:01.216 8616-8787/? E/AndroidRuntime﹕ FATAL EXCEPTION: AsyncTask #2
java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:299)
at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
at java.util.concurrent.FutureTask.run(FutureTask.java:137)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
at java.lang.Thread.run(Thread.java:856)
Caused by: java.lang.NoClassDefFoundError: org.apache.http.entity.mime.MultipartEntityBuilder
at com.example.oleg.myapplication.MainActivity$1.uploadFile(MainActivity.java:305)
at com.example.oleg.myapplication.MainActivity$1.doInBackground(MainActivity.java:285) at com.example.oleg.myapplication.MainActivity$1.doInBackground(MainActivity.java:279) at android.os.AsyncTask$2.call(AsyncTask.java:287)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
at java.util.concurrent.FutureTask.run(FutureTask.java:137)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
at java.lang.Thread.run(Thread.java:856)

Downloading images with multiple Threads causes an OutOfMemory Exception

I'm retrieve the String of image name and having to download bitmap from server
For getting String of image name fron JSON data and download using this link :
String str_ImgURL_bmp_pattern = "http://xxxx/xxx/MobileService.svc/DownloadFile/FileName/" + imageName;
download_PngFile(str_ImgURL_bmp_pattern);
void download_PngFile(String fileUrl) {
Log.e("In download_PngFile ", " str_imgList_imageaudioPath = " + imageName);
Bitmap imagenObtenida = null;
try {
URL ImgUrl = new URL(fileUrl);
HttpURLConnection conn = (HttpURLConnection) ImgUrl.openConnection();
conn.connect();
imagenObtenida = BitmapFactory.decodeStream(conn.getInputStream());
//Log.e("imagenObtenida", " = " + imagenObtenida);
String fotoname = imageName;
File file = new File(newFolder, fotoname);
int sizeOfImage = (int) file.length();
Log.e("sizeOfImage ", " = " + sizeOfImage + "# " + imageName);
if (file.exists()) file.delete();
try {
FileOutputStream out = new FileOutputStream(file);
imagenObtenida.compress(Bitmap.CompressFormat.PNG, 100, out);
out.flush();
out.close();
// Log.e("Png = ", "DownLoad complete");
} catch (Exception e) {
}
} catch (IOException e) {
e.printStackTrace();
}
}
But this some images are download and after sometime app crashes and I get the error in the title in logcat.
java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:278)
at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
at java.util.concurrent.FutureTask.run(FutureTask.java:137)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
at java.lang.Thread.run(Thread.java:856)
Caused by: java.lang.OutOfMemoryError
at android.graphics.BitmapFactory.nativeDecodeStream(Native Method)
at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:493)
at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:549)
at com.example.tazeen.classnkk.AllPosts_Page.download_PngFile(AllPosts_Page.java:896)
at com.example.tazeen.classnkk.AllPosts_Page.getDoenLoaddata(AllPosts_Page.java:820)
at com.example.tazeen.classnkk.AllPosts_Page$GetgetAllImagePath_List.doInBackground(AllPosts_Page.java:781)
at com.example.tazeen.classnkk.AllPosts_Page$GetgetAllImagePath_List.doInBackground(AllPosts_Page.java:771)
at android.os.AsyncTask$2.call(AsyncTask.java:264)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
            at java.util.concurrent.FutureTask.run(FutureTask.java:137)
            at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208)
            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
            at java.lang.Thread.run(Thread.java:856)
The error at this line :imagenObtenida = BitmapFactory.decodeStream(conn.getInputStream());
How to resolve this issues.

So basically the exception is pretty clear.
You are out of memory.
There are some possible solutions:
1. Scale down your images:
BitmapFactory.Options options = new BitmapFactory.Options();
options.inSampleSize = 2;
Bitmap imagenObtenida = BitmapFactory.decodeStream(conn.getInputStream(), null, options);
This is required, if even a single image download causes a crash.
2. Don't decode at the same time
So don't use a ThreadPoolExecutor
3. Combinations
For example:
-just use 2 parallel Threads
-check the available memory and set a thread number which fits to the current memory
-catch out of memory exceptions and wait till other thread finish

Handle "Server not responding" exception in AsyncTask

How do you handle the RuntimeException when AsyncTask couldn't connect to server since server is "down" for some reason?
What do I try is a bunch of catch blocks (doesn't help):
try {
// Create Request to server and get response
HttpGet httpget = new HttpGet(activity.getString(R.string.get_channels_lang_host));
ResponseHandler<String> responseHandler = new BasicResponseHandler();
downloadedString = httpclient.execute(httpget, responseHandler);
}catch (MalformedURLException e) {
Log.e("URL:","is a malformed URL");
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
Log.e("URL:"," UnsupportedEncodingException");
} catch (ClientProtocolException e) {
e.printStackTrace();
Log.e("URL:"," ClientProtocolException");
} catch (SocketTimeoutException e) {
e.printStackTrace();
Log.e("URL:"," SocketTimeoutException");
} catch (ConnectTimeoutException e) {
e.printStackTrace();
Log.e("URL:"," ConnectTimeoutException");
} catch (IOException e) {
Log.e("URL:","IOException");
e.printStackTrace();
}
if (downloadedString != null) {
//parse request to object
dataChannelsLangArrayList = JsonParser.getDataChannelsLang(downloadedString);
} else {
Toast.makeText(ActivityLoading.this, "Failed to load data. Restarting...", Toast.LENGTH_LONG).show();
Global.restartApp(ActivityLoading.this);
}
i'm still getting the runtime error:
04-09 11:31:29.610 3696-3719/tenkol.design.com.imbrecords E/AndroidRuntime﹕ FATAL EXCEPTION: AsyncTask #1
java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:299)
at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
at java.util.concurrent.FutureTask.run(FutureTask.java:137)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
at java.lang.Thread.run(Thread.java:864)
Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
at android.os.Handler.<init>(Handler.java:121)
at android.widget.Toast$TN.<init>(Toast.java:322)
at android.widget.Toast.<init>(Toast.java:91)
at android.widget.Toast.makeText(Toast.java:238)
at tenkol.design.com.imbrecords.Global.restartApp(Global.java:115)
at tenkol.design.com.imbrecords.ActivityLoading$LoadingAsyncTask.getChannelsLang(ActivityLoading.java:249)
at tenkol.design.com.imbrecords.ActivityLoading$LoadingAsyncTask.doInBackground(ActivityLoading.java:157)
at tenkol.design.com.imbrecords.ActivityLoading$LoadingAsyncTask.doInBackground(ActivityLoading.java:141)
at android.os.AsyncTask$2.call(AsyncTask.java:287)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
            at java.util.concurrent.FutureTask.run(FutureTask.java:137)
            at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
            at java.lang.Thread.run(Thread.java:864)
I'm mostly interested in two cases:
When server doesn't respond at all;
When the time spend for request is too big (i.e. with slow Internet).
What is the proper way to handle those?

Can't create handler inside thread that has not called Looper.prepare()
Well, you have created a Handler, but the thread it is linked to doesn't have any message queue to post stuff on.
Try new Handler(Looper.getMainLooper()) for a handler linked to main thread.
Then you can post a Runnable on it which shows a toast.
But seriously, why not collect exception and result both and handle it all in onPostExecute() ?
Public class Result<T>{
public T data;
public Exception exception;
public String message;
}

NullPointerException only when on Google Play Store?

I recently uploaded an update of my app to Google Play. When trying it out, I get an error when clicking on a manually added banner (e.g. not AdMob or anything like that). The click is setting of an AsyncTask that sends data to a php-script using POST. I use ProGuard so when I send the error report to myself I am only able to see the method in which the error is caused: doInBackground. I am also able to see that it is a NullPointerException. The strange thing is, when I run the app on my device from my computer using Eclipse, the error doesn't occur, so I can't really find what line is causing the NullPointerException. It has worked perfectly in previous versions of my app, and I haven't made any changes to this code. And when I look through the method doInBackground, I can't find any place where a NullPointerException might occur.
Here is the error message from my developers console, this is proguarded though:
java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:278)
at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
at java.util.concurrent.FutureTask.run(FutureTask.java:137)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
at java.lang.Thread.run(Thread.java:856)
Caused by: java.lang.NullPointerException
at se.nollekollen.main.d.a(Unknown Source)
at se.nollekollen.main.d.doInBackground(Unknown Source)
at android.os.AsyncTask$2.call(AsyncTask.java:264)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
... 5 more
And here is my doInBackground:
#Override
protected String doInBackground(String... arg0) {
String url_stats = "http://xxxxx.xx/statistik/sendStatistics_click.php";
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("activity", getClass().getEnclosingClass().getName().substring(20)));
params.add(new BasicNameValuePair("section", SECTION));
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url_stats);
try {
httpPost.setEntity(new UrlEncodedFormEntity(params));
} catch (UnsupportedEncodingException e1) {
e1.printStackTrace();
}
try {
httpClient.execute(httpPost);
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
The only thing that could be null here is actually "SECTION", but that wouldn't cause a NullPointerException since the value can be null when creating a new BasicNameValuePair(key, value).
Can anyone find what could cause the NullPointerException? And how is it possible that this ONLY occurs when the app is downloaded from Google Play, and not when run from the computer?

Out of memory while reading large xml file from server using Post

I am using the below code to fetch xml file from the server and due to heavy and large xml file, it got crashed and showing Out of memory Issue.
public class Connect {
static BufferedReader in=null;
String result=null;
Context context;
//Establish connection with web server
public String HTTPConnect(String uri1,List<NameValuePair> list,Context context)
{
this.context=context;
try {
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(uri1);
if(list!=null)
{
UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(list);
httpPost.setEntity(formEntity);
}
HttpResponse httpResponse = httpClient.execute(httpPost);
in = new BufferedReader(new InputStreamReader(httpResponse.getEntity().getContent()));
StringBuffer sb = new StringBuffer("");
String line = "";
String NL = System.getProperty("line.separator");
long heapSize = Runtime.getRuntime().totalMemory();
if(in!=null)
{
while ((line = in.readLine()) != null) {//crasheg here
sb.append(line + NL);
}
in.close();
}
result = sb.toString();
}
catch(UnsupportedEncodingException e)
{
String err = (e.getMessage()==null)?"Cant connect to server":e.getMessage();
ShowDialog();
}
catch (MalformedURLException e) {
String err = (e.getMessage()==null)?"Malformed Exception":e.getMessage();
ShowDialog();
}
catch(Exception ex)
{
String err = (ex.getMessage()==null)?"NetworkConnectionException":ex.getMessage();
ShowDialog();
}
finally {
if (in != null) {
try {
in.close();
} catch (Exception ex) {
String err = (ex.getMessage()==null)?"Excepion":ex.getMessage();
ex.printStackTrace();
}
}
}
return result;
}
I know that that I am copying the whole XML in String and due to heavy file, It gor crashing. It is working fine in small size of XML file, but what are the alternative for large xml file. I am uing SAX parser for parsing this xml file.
[EDIT]
Below is the logcat:
FATAL EXCEPTION: AsyncTask #4
java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:200)
at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
at java.util.concurrent.FutureTask.run(FutureTask.java:137)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1068)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:561)
at java.lang.Thread.run(Thread.java:1096)
Caused by: java.lang.OutOfMemoryError
java.lang.AbstractStringBuilder.enlargeBuffer(AbstractStringBuilder.java:97)
java.lang.AbstractStringBuilder.append0(AbstractStringBuilder.java:136)
java.lang.StringBuilder.append(StringBuilder.java:272)
java.io.BufferedReader.readLine(BufferedReader.java:452)
com.kxs.appitize.Connect.HTTPConnect(Connect.java:56)
com.kxs.appitize.ListRestaurants$Asyn_rest.doInBackground(ListRestaurants.java:168)
com.kxs.appitize.ListRestaurants$Asyn_rest.doInBackground(ListRestaurants.java:1)
01-at android.os.AsyncTask$2.call(AsyncTask.java:185)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
Activity com.kxs.appitize.TabsMainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView#44f4fb28 that was originally added here
android.view.WindowLeaked: Activity com.kxs.appitize.TabsMainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView#44f4fb28 that was originally added here
at android.view.ViewRoot.<init>(ViewRoot.java:247)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:148)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
at android.view.Window$LocalWindowManager.addView(Window.java:424)
at android.app.Dialog.show(Dialog.java:241)
at com.kxs.appitize.ListRestaurants$Asyn_rest.onPreExecute(ListRestaurants.java:156)
at android.os.AsyncTask.execute(AsyncTask.java:391)
at com.kxs.appitize.ListRestaurants.onCreate(ListRestaurants.java:133)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
at android.app.ActivityThread.startActivityNow(ActivityThread.java:2503)
at android.app.LocalActivityManager.moveToState(LocalActivityManager.java:127)
at android.app.LocalActivityManager.startActivity(LocalActivityManager.java:339)
at com.kxs.appitize.TabGroupActivity.startChildActivity(TabGroupActivity.java:72)
at com.kxs.appitize.ListCategories$1.onClick(ListCategories.java:109)
at android.view.View.performClick(View.java:2408)
at android.view.View$PerformClick.run(View.java:8816)
at android.os.Handler.handleCallback(Handler.java:587)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:123)
at android.app.ActivityThread.main(ActivityThread.java:4627)
at java.lang.reflect.Method.invokeNative(Native Method)
java.lang.reflect.Method.invoke(Method.java:521)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
at dalvik.system.NativeStart.main(Native Method)

copying the whole XML in String and due to heavy file
Bad idea. First you need to cache the xml in a temporary directory. It should never be in the RAM.
Once you do that use SAX to parse the file. During parsing try not to keep the whole structure in the RAM, instead parse in bite sized chunks.

Try to use inputStream to parse XML. The inputStrem does not increase Android stack size and it's prevent possibles OOM with large String. I have the same things with large JSON and now, i use Jackson to parse JSON directly from Stream.
You can find equivalent library for parsing XML.