OCR can be pretty CPU intensive, you might want to reconsider doing it on a smart phone.

That aside, to my knowledge the popular OCR libraries are [Aspire][1] and [Tesseract][2].  Neither are straight up Java, so you&#39;re not going to get a drop-in Android OCR library.

However, Tesseract is open source (GitHub hosted infact); so you can throw some time at porting the subset you need to Java.  My understanding is its _not insane_ C++, so depending on how badly you need OCR it might be worth the time.

So short answer: No.

Long answer: if you&#39;re willing to work for it.

  [1]: http://asprise.com/product/ocr/index.php?lang=java
  [2]: https://github.com/tesseract-ocr

I am having quite a lot of luck with [tesseract-android-tools][1]

  [1]: http://code.google.com/p/tesseract-android-tools/

ANother option could be to post the image to a webapp (possibly at a later moment), and have it OCR-processed there without the C++ -&gt; Java port issues and possibly clogging the mobile CPU.

[Google Goggles][1] is the perfect application for doing both OCR and translation.  
And the good news is that [Google Goggles to Become App Platform][2].

Until then, you can use [IQ Engines][3].

  [1]: http://www.google.com/mobile/goggles/
  [2]: http://phandroid.com/2010/04/14/google-goggles-to-become-app-platform/
  [3]: http://www.iqengines.com/

Yes there is.

But OCR is very vast. I know an Android application that has an OCR feature, but that might not be the kind of OCR you are looking after.

This open-source application is called &lt;a href=&quot;http://code.google.com/p/aedict/&quot;&gt;Aedict&lt;/a&gt;, and it does OCR on handwritten Japanese characters. It is not that slow.

If it is not what you are looking for, please precise which kind of characters, and which data input (image or X-Y touch history).

You can use the google docs [OCR reader][1].


  [1]: https://developers.google.com/google-apps/documents-list/#uploading_documents_using_optical_character_recognition_ocr

I need to compress a large file of about 17-20 GB. I need to split it into several files of around 1GB per file.

I searched for a solution via Google and found ways using `split` and `cat` commands. But they did not work for large files at all. Also, they won&#39;t work in Windows; I need to extract it on a Windows machine.

Split files using tar, gz, zip, or bzip2

Is there any difference between a *sorted* and an *ordered* collection?

What is the difference between an ordered and a sorted collection?

I&#39;m looking for a Java OCR that runs on Android, however Asprise doesn&#39;t seem to be a platform independent OCR.  is there any opensource/free Java OCR I can use for android application development?

Is there any free OCR library for Android?

<p>I'm looking for a Java OCR that runs on Android, however Asprise doesn't seem to be a platform independent OCR.  is there any opensource/free Java OCR I can use for android application development?</p>


I have an `EditText` and a `Button` in my layout.

After writing in the edit field and clicking on the `Button`, I want to hide the virtual keyboard when touching outside the keyboard. I assume that this is a simple piece of code, but where can I find an example of it?

How to close/hide the Android soft keyboard programmatically?

My program does some network activity in a background thread. Before starting, it pops up a progress dialog. The dialog is dismissed on the handler. This all works fine, except when screen orientation changes while the dialog is up (and the background thread is going). At this point the app either crashes, or deadlocks, or gets into a weird stage where the app does not work at all until all the threads have been killed.

How can I handle the screen orientation change gracefully?

The sample code below matches roughly what my real program does:

    public class MyAct extends Activity implements Runnable {
        public ProgressDialog mProgress;

        // UI has a button that when pressed calls send
    
        public void send() {
             mProgress = ProgressDialog.show(this, &quot;Please wait&quot;, 
                          &quot;Please wait&quot;, 
                          true, true);
            Thread thread = new Thread(this);
            thread.start();
        }
    
        public void run() {
            Thread.sleep(10000);
            Message msg = new Message();
            mHandler.sendMessage(msg);
        }
    
        private final Handler mHandler = new Handler() {
            @Override
            public void handleMessage(Message msg) {
                mProgress.dismiss();
            }
        };
    }

Stack:

    E/WindowManager(  244): Activity MyAct has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@433b7150 that was originally added here
    E/WindowManager(  244): android.view.WindowLeaked: Activity MyAct has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@433b7150 that was originally added here
    E/WindowManager(  244): 	at android.view.ViewRoot.&lt;init&gt;(ViewRoot.java:178)
    E/WindowManager(  244): 	at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:147)
    E/WindowManager(  244): 	at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:90)
    E/WindowManager(  244): 	at android.view.Window$LocalWindowManager.addView(Window.java:393)
    E/WindowManager(  244): 	at android.app.Dialog.show(Dialog.java:212)
    E/WindowManager(  244): 	at android.app.ProgressDialog.show(ProgressDialog.java:103)
    E/WindowManager(  244): 	at android.app.ProgressDialog.show(ProgressDialog.java:91)
    E/WindowManager(  244): 	at MyAct.send(MyAct.java:294)
    E/WindowManager(  244): 	at MyAct$4.onClick(MyAct.java:174)
    E/WindowManager(  244): 	at android.view.View.performClick(View.java:2129)
    E/WindowManager(  244): 	at android.view.View.onTouchEvent(View.java:3543)
    E/WindowManager(  244): 	at android.widget.TextView.onTouchEvent(TextView.java:4664)
    E/WindowManager(  244): 	at android.view.View.dispatchTouchEvent(View.java:3198)

I have tried to dismiss the progress dialog in onSaveInstanceState, but that just prevents an immediate crash. The background thread is still going, and the UI is in partially drawn state. Need to kill the whole app before it starts working again.


How to handle screen orientation change when progress dialog and background thread active?

When I am trying to run an android application which uses Google API I get the following error

&gt; [2009-07-11 11:46:43 - FirstMapView] Installation error: INSTALL_FAILED_MISSING_SHARED_LIBRARY  
[2009-07-11 11:46:43 - FirstMapView] Please check logcat output for more details.  
[2009-07-11 11:46:44 - FirstMapView] Launch canceled!

Can anyone help me solve this error?


INSTALL_FAILED_MISSING_SHARED_LIBRARY error in Android

I just basically want to switch to the number pad mode as soon a certain EditText has the focus.

How do I show the number keyboard on an EditText in android?

So I have a custom ListView object. The list items have two textviews stacked on top of each other, plus a horizontal progress bar that I want to remain hidden until I actually do something. To the far right is a checkbox that I only want to display when the user needs to download updates to their database(s). When I disable the checkbox by setting the visibility to Visibility.GONE, I am able to click on the list items. When the checkbox is visible, I am unable to click on anything in the list except the checkboxes. I&#39;ve done some searching but haven&#39;t found anything relevant to my current situation. I found [this question][1] but I&#39;m using an overridden ArrayAdapter since I&#39;m using ArrayLists to contain the list of databases internally. Do I just need to get the LinearLayout view and add an onClickListener like Tom did? I&#39;m not sure.

Here&#39;s the listview row layout XML:

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
    &lt;LinearLayout xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
        android:layout_width=&quot;fill_parent&quot;
        android:layout_height=&quot;?android:attr/listPreferredItemHeight&quot;
        android:padding=&quot;6dip&quot;&gt;
        &lt;LinearLayout
            android:orientation=&quot;vertical&quot;
            android:layout_width=&quot;0dip&quot;
            android:layout_weight=&quot;1&quot;
            android:layout_height=&quot;fill_parent&quot;&gt;
            &lt;TextView
                android:id=&quot;@+id/UpdateNameText&quot;
                android:layout_width=&quot;wrap_content&quot;
                android:layout_height=&quot;0dip&quot;
                android:layout_weight=&quot;1&quot;
    	        android:textSize=&quot;18sp&quot;
                android:gravity=&quot;center_vertical&quot;
        	    /&gt;
            &lt;TextView
                android:layout_width=&quot;fill_parent&quot;
                android:layout_height=&quot;0dip&quot;
                android:layout_weight=&quot;1&quot;
                android:id=&quot;@+id/UpdateStatusText&quot;
                android:singleLine=&quot;true&quot;
                android:ellipsize=&quot;marquee&quot;
    	        /&gt;
        	&lt;ProgressBar android:id=&quot;@+id/UpdateProgress&quot; 
        				 android:layout_width=&quot;fill_parent&quot; 
        				 android:layout_height=&quot;wrap_content&quot;
                         android:indeterminateOnly=&quot;false&quot; 
    				     android:progressDrawable=&quot;@android:drawable/progress_horizontal&quot; 
    				     android:indeterminateDrawable=&quot;@android:drawable/progress_indeterminate_horizontal&quot; 
    				     android:minHeight=&quot;10dip&quot; 
    				     android:maxHeight=&quot;10dip&quot;    				  
        				 /&gt;
    	&lt;/LinearLayout&gt;
    	&lt;CheckBox android:text=&quot;&quot; 
    			  android:id=&quot;@+id/UpdateCheckBox&quot; 
    			  android:layout_width=&quot;wrap_content&quot; 
    			  android:layout_height=&quot;wrap_content&quot; 
    			  /&gt;
    &lt;/LinearLayout&gt;

And here&#39;s the class that extends the ListActivity. Obviously it&#39;s still in development so forgive the things that are missing or might be left laying around:


    public class UpdateActivity extends ListActivity {
    
        AccountManager lookupDb;
        boolean allSelected;
        UpdateListAdapter list;
        
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
    
            lookupDb = new AccountManager(this);
            lookupDb.loadUpdates();
    
            setContentView(R.layout.update);
            allSelected = false;
            
            list = new UpdateListAdapter(this, R.layout.update_row, lookupDb.getUpdateItems());
            setListAdapter(list);
            
            Button btnEnterRegCode = (Button)findViewById(R.id.btnUpdateRegister);
            btnEnterRegCode.setVisibility(View.GONE);
            
            Button btnSelectAll = (Button)findViewById(R.id.btnSelectAll);
            btnSelectAll.setOnClickListener(new Button.OnClickListener() {
                @Override
                public void onClick(View v) {
                    allSelected = !allSelected;
                    
                    for(int i=0; i &lt; lookupDb.getUpdateItems().size(); i++) {
                        lookupDb.getUpdateItem(i).setSelected(!lookupDb.getUpdateItem(i).isSelected());
                    }
                    
                    list.notifyDataSetChanged();
                    // loop through each UpdateItem and set the selected attribute to the inverse 
                    
                } // end onClick
            }); // end setOnClickListener
            
            Button btnUpdate = (Button)findViewById(R.id.btnUpdate);
            btnUpdate.setOnClickListener(new Button.OnClickListener() {
                @Override
                public void onClick(View v) {
                } // end onClick
            }); // end setOnClickListener
    
            lookupDb.close();
        } // end onCreate
    
    
        @Override
        protected void onDestroy() {
            super.onDestroy();
            
            for (UpdateItem item : lookupDb.getUpdateItems()) {
                item.getDatabase().close();        
            }
        }
    
        @Override
        protected void onListItemClick(ListView l, View v, int position, long id) {
            super.onListItemClick(l, v, position, id);
            
            UpdateItem item = lookupDb.getUpdateItem(position);
            
            if (item != null) {
                item.setSelected(!item.isSelected());
                list.notifyDataSetChanged();
            }
        }
    
        private class UpdateListAdapter extends ArrayAdapter&lt;UpdateItem&gt; {
            private List&lt;UpdateItem&gt; items;
    
            public UpdateListAdapter(Context context, int textViewResourceId, List&lt;UpdateItem&gt; items) {
                super(context, textViewResourceId, items);
                this.items = items;
            }
    
            @Override
            public View getView(int position, View convertView, ViewGroup parent) {
                View row = null;
                
                if (convertView == null) {
                    LayoutInflater li = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                    row = li.inflate(R.layout.update_row, null);
                } else {
                    row = convertView;
                }
                
                UpdateItem item = items.get(position);
                
                if (item != null) {
                    TextView upper = (TextView)row.findViewById(R.id.UpdateNameText);
                    TextView lower = (TextView)row.findViewById(R.id.UpdateStatusText);
                    CheckBox cb = (CheckBox)row.findViewById(R.id.UpdateCheckBox);
                
                    upper.setText(item.getName());
                    lower.setText(item.getStatusText());
                    
                    if (item.getStatusCode() == UpdateItem.UP_TO_DATE) {
                        cb.setVisibility(View.GONE);
                    } else {
                        cb.setVisibility(View.VISIBLE);
                        cb.setChecked(item.isSelected());
                    }
                    
                    ProgressBar pb = (ProgressBar)row.findViewById(R.id.UpdateProgress);
                    pb.setVisibility(View.GONE);
                }
                return row;
            }
            
        } // end inner class UpdateListAdapter
    }

edit: I&#39;m still having this problem. I&#39;m cheating and adding onClick handlers to the textviews but it seems extremely stupid that my onListItemClick() function is not being called at all when I am not clicking on my checkbox.
  [1]: https://stackoverflow.com/questions/895341/custom-list-clicking-with-checkboxes-in-android

Custom ListView click issue on items in Android

This is primarily just curiosity, but are there any OCR implementations in pure Java? I&#39;m curious how this would perform purely in Java, and OCR in general interests me, so I&#39;d love to see how it&#39;s implemented in a language I thoroughly understand. Naturally, this would require that the implementation is open source, but I&#39;m still interested in proprietary solutions, as I could at least check out the performance in that case.

I&#39;ve seen a couple which can be used in Java (like [Asprise][1]) but it doesn&#39;t seem that these are pure Java implementations... are there any?


  [1]: http://asprise.com/home/

Java OCR implementation

Are there any free OCR libraries that work with PHP or Python on a Linux server? The idea is to be able to upload an image and pull out characters from it, or allow users to &quot;draw characters&quot;, and parse them out of said image.

How can I implement OCR on a website using PHP?

Is it possible to limit the set of characters that [tesseract][1] is looking for (e.g. search only for letters a-z)? That would improve my results greatly.


  [1]: http://code.google.com/p/tesseract-ocr/

Limit characters tesseract is looking for

I need an open OCR library which is able to scan complex printed math formulas (for example some formulas which were generated via LaTeX). I want to get some LaTeX-like output (or just some AST-like data).

Is there something like this already? Or are current OCR technics just able to parse line-oriented text?

(Note that I also posted [this question on Metaoptimize](http://metaoptimize.com/qa/questions/2097/ocr-lib-for-math-formulas) because some people there might have additional knowledge.)

The problem was also described by OpenAI as [im2latex](https://openai.com/requests-for-research/#im2latex).


OCR lib for math formulas

I want to create a application which gets the word under the cursor (not only for text fields), but I can&#39;t find how to do that. Using OCR is pretty hard. The only thing I&#39;ve seen working is the Deskperience components. They support a &#39;native&#39; way, but I they cost a lot. Now I&#39;m trying to figure out what is this &#39;native&#39; way (maybe somehow of hooking). Any help will be appreciated.


**EDIT:**
I found a way, but it gets only the whole text of the control. Any idea how to get only the word under the cursor from the whole text?

Content Type	Original Author	Original Content on Stackoverflow
Question	user121196	View Question on Stackoverflow
Solution 1 - Android	Kevin Montrose	View Answer on Stackoverflow
Solution 2 - Android	Ben Pearson	View Answer on Stackoverflow
Solution 3 - Android	Jaco	View Answer on Stackoverflow
Solution 4 - Android	harrymc	View Answer on Stackoverflow
Solution 5 - Android	Nicolas Raoul	View Answer on Stackoverflow
Solution 6 - Android	richardwiden	View Answer on Stackoverflow

Is there any free OCR library for Android?

Android Problem Overview

Android Solutions

Solution 1 - Android

Solution 2 - Android

Solution 3 - Android

Solution 4 - Android

Solution 5 - Android

Solution 6 - Android

What is the difference between an ordered and a sorted collection?

Split files using tar, gz, zip, or bzip2

Attributions