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POAndroid Async task Run time Exception Error.
 

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  1. POAndroid Async task Run time Exception Error.
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    <p>I am doing a decryption task in android platform. At first, I create a method called RunDecrypt. It's work fine when I press the button in my UI. The method shown below:</p> <pre><code>public void runDecrypt() throws IOException{ EditText editText = (EditText) findViewById(R.id.fileName); EditText editText2 = (EditText) findViewById(R.id.keyName); String fileName = editText.getText().toString(); String keyName = editText2.getText().toString(); File sdcard = Environment.getExternalStorageDirectory(); File file = new File(sdcard , fileName); File key = new File(sdcard, keyName); BufferedReader brFile; String Cipher = null; try{ //Read file line by line and concat each line of string in file with space character. FileInputStream fstream = new FileInputStream(file); brFile = new BufferedReader(new InputStreamReader(fstream)); String tempString; while((tempString = brFile.readLine()) != null){ if(Cipher == null){ Cipher = tempString; }else{ Cipher = Cipher.concat(" "); Cipher = Cipher.concat(tempString); } } }catch(Exception e){ //messageBox("Decrypt", e.getMessage()); } BufferedReader brKey; String DecKey = null; try{ FileInputStream fstream = new FileInputStream(key); brKey = new BufferedReader(new InputStreamReader(fstream)); DecKey = brKey.readLine(); }catch(Exception e){ //messageBox("Decrypt", e.getMessage()); } try{ byte[] cipherByte = DES.parseBytes(Cipher); String decKey = DES.convertStringToHex(DecKey); byte[] keyByte = DES.parseBytes(decKey); String decryptResult = DES.hex(DES.decryptCBC(cipherByte, keyByte)); String temp = decryptResult.replace(" ", ""); String finalDecrypt = temp.substring(0, (temp.length() - DES.getConcatCount())); String finResult = DES.convertHexToString(finalDecrypt); TextView FinalResult = (TextView)findViewById(R.id.decryptText); FinalResult.setText(finResult); }catch(Exception e){ messageBox("Decrypt", "Please Upload File Properly"); } } </code></pre> <p>Since it's work fine, I try to implement this method with Async Task for running my work in background. The class that implemented shown below:</p> <pre><code>private class runDecrypt extends AsyncTask &lt;URL , Integer, Long&gt; { private final ProgressDialog dialog = new ProgressDialog(Homepage.this); AlertDialog.Builder builder = new AlertDialog.Builder(Homepage.this); @SuppressWarnings("resource") @Override protected Long doInBackground(URL... params) { EditText editText = (EditText) findViewById(R.id.fileName); EditText editText2 = (EditText) findViewById(R.id.keyName); String fileName = editText.getText().toString(); String keyName = editText2.getText().toString(); File sdcard = Environment.getExternalStorageDirectory(); File file = new File(sdcard , fileName); File key = new File(sdcard, keyName); BufferedReader brFile; String Cipher = null; try{ //Read file line by line and concat each line of string in file with space character. FileInputStream fstream = new FileInputStream(file); brFile = new BufferedReader(new InputStreamReader(fstream)); String tempString; try { while((tempString = brFile.readLine()) != null){ if(Cipher == null){ Cipher = tempString; }else{ Cipher = Cipher.concat(" "); Cipher = Cipher.concat(tempString); } } } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } }catch(java.io.FileNotFoundException e){ System.out.println("File could not be found."); } BufferedReader brKey; String DecKey = null; try{ FileInputStream fstream = new FileInputStream(key); brKey = new BufferedReader(new InputStreamReader(fstream)); try { DecKey = brKey.readLine(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } }catch(java.io.FileNotFoundException e){ System.out.println("Key file could not be found."); } String decKey = DES.convertStringToHex(DecKey); byte[] cipherByte = DES.parseBytes(Cipher); byte[] keyByte = DES.parseBytes(decKey); String decryptResult = DES.hex(DES.decryptCBC(cipherByte, keyByte)); String temp = decryptResult.replace(" ", ""); String finalDecrypt = temp.substring(0, (temp.length() - DES.getConcatCount())); String finResult = DES.convertHexToString(finalDecrypt); TextView FinalResult = (TextView)findViewById(R.id.decryptText); FinalResult.setText(finResult); return null; } protected void onPreExecute() { this.dialog.setMessage("Decrypting..."); this.dialog.show(); } protected void onPostExecute(Long result) { if (this.dialog.isShowing()) { this.dialog.dismiss(); } builder.setMessage("Decryption Completed"); builder.show(); } protected void onProgressUpdate(int progress) { setProgress(progress * 100); } } </code></pre> <p>My onClick method:</p> <pre><code>public void onClick (View v){ Intent browse = new Intent(this, Browse.class); switch (v.getId()){ case R.id.browseFile: browse.putExtra("browse","file"); startActivityForResult(browse, 1); break; case R.id.browseKey: browse.putExtra("browse", "key"); startActivityForResult(browse, 1); break; case R.id.decrypt: new runDecrypt().execute(); break; default: break; } } </code></pre> <p>My logcat shown below: <img src="https://i.stack.imgur.com/RG8F2.png" alt="logcat"></p> <p>Can Anyone please help? Thank you and appreciated!</p>
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    1. USYeesum Chan
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    1. CO`doInBackground()` is invoked on the background thread. Reading from the UI should be done inside `onPreExecute()` method which is invoked on the UI thread.
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      1. POAndroid Async task Run time Exception Error.
      1. USShashank Kadne
 

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