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POAndroid: NullPointer Exception
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copied!<p>This is the error that I get in Logcat.</p> <pre><code>04-23 08:00:07.524: E/AndroidRuntime(1384): FATAL EXCEPTION: main 04-23 08:00:07.524: E/AndroidRuntime(1384): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.datumdroid.android.ocr.simple/com.datumdroid.android.ocr.simple.SimpleAndroidOCRActivity}: java.lang.NullPointerException 04-23 08:00:07.524: E/AndroidRuntime(1384): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180) 04-23 08:00:07.524: E/AndroidRuntime(1384): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 04-23 08:00:07.524: E/AndroidRuntime(1384): at android.app.ActivityThread.access$600(ActivityThread.java:141) 04-23 08:00:07.524: E/AndroidRuntime(1384): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) 04-23 08:00:07.524: E/AndroidRuntime(1384): at android.os.Handler.dispatchMessage(Handler.java:99) 04-23 08:00:07.524: E/AndroidRuntime(1384): at android.os.Looper.loop(Looper.java:137) 04-23 08:00:07.524: E/AndroidRuntime(1384): at android.app.ActivityThread.main(ActivityThread.java:5039) 04-23 08:00:07.524: E/AndroidRuntime(1384): at java.lang.reflect.Method.invokeNative(Native Method) 04-23 08:00:07.524: E/AndroidRuntime(1384): at java.lang.reflect.Method.invoke(Method.java:511) 04-23 08:00:07.524: E/AndroidRuntime(1384): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 04-23 08:00:07.524: E/AndroidRuntime(1384): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 04-23 08:00:07.524: E/AndroidRuntime(1384): at dalvik.system.NativeStart.main(Native Method) 04-23 08:00:07.524: E/AndroidRuntime(1384): Caused by: java.lang.NullPointerException 04-23 08:00:07.524: E/AndroidRuntime(1384): at com.datumdroid.android.ocr.simple.SimpleAndroidOCRActivity.onCreate(SimpleAndroidOCRActivity.java:68) 04-23 08:00:07.524: E/AndroidRuntime(1384): at android.app.Activity.performCreate(Activity.java:5104) 04-23 08:00:07.524: E/AndroidRuntime(1384): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080) 04-23 08:00:07.524: E/AndroidRuntime(1384): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144) </code></pre> <p>Splash Screen Activity</p> <pre> public class SplashAct extends Activity { /** Called when the activity is first created. */ private final Handler mHandler = new Handler(); private static final int duration = 1500; @Override protected void onCreate(final Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.splash); mHandler.postDelayed(mPendingLauncherRunnable, SplashAct.duration); } @Override protected void onPause() { super.onPause(); mHandler.removeCallbacks(mPendingLauncherRunnable); } private final Runnable mPendingLauncherRunnable = new Runnable() { public void run() { final Intent intent = new Intent(SplashAct.this, SimpleAndroidOCRActivity.class); startActivity(intent); finish(); } }; } </pre> <p>Main Activity</p> <pre><code>public class SimpleAndroidOCRActivity extends Activity implements OnInitListener { public static final String PACKAGE_NAME = "com.datumdroid.android.ocr.simple"; public static final String DATA_PATH = Environment .getExternalStorageDirectory().toString() + "/SimpleAndroidOCR/"; // You should have the trained data file in assets folder // You can get them at: // http://code.google.com/p/tesseract-ocr/downloads/list public static final String lang = "eng"; private static final String TAG = "SimpleAndroidOCR.java"; protected Button _button, btnSpeak; // protected ImageView _image; protected EditText _field; protected String _path; protected boolean _taken; protected static final String PHOTO_TAKEN = "photo_taken"; //tts private TextToSpeech tts; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //tts tts = new TextToSpeech(this, this); btnSpeak = (Button) findViewById(R.id.button1); btnSpeak.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { speakOut(); } }); //ocr String[] paths = new String[] { DATA_PATH, DATA_PATH + "tessdata/" }; for (String path : paths) { File dir = new File(path); if (!dir.exists()) { if (!dir.mkdirs()) { Log.v(TAG, "ERROR: Creation of directory " + path + " on sdcard failed"); return; } else { Log.v(TAG, "Created directory " + path + " on sdcard"); } } } // lang.traineddata file with the app (in assets folder) // You can get them at: // http://code.google.com/p/tesseract-ocr/downloads/list // This area needs work and optimization if (!(new File(DATA_PATH + "tessdata/" + lang + ".traineddata")).exists()) { try { AssetManager assetManager = getAssets(); InputStream in = assetManager.open("tessdata/eng.traineddata"); //GZIPInputStream gin = new GZIPInputStream(in); OutputStream out = new FileOutputStream(DATA_PATH + "tessdata/eng.traineddata"); // Transfer bytes from in to out byte[] buf = new byte[1024]; int len; //while ((lenf = gin.read(buff)) > 0) { while ((len = in.read(buf)) > 0) { out.write(buf, 0, len); } in.close(); //gin.close(); out.close(); Log.v(TAG, "Copied " + lang + " traineddata"); } catch (IOException e) { Log.e(TAG, "Was unable to copy " + lang + " traineddata " + e.toString()); } } super.onCreate(savedInstanceState); setContentView(R.layout.main); // _image = (ImageView) findViewById(R.id.image); _field = (EditText) findViewById(R.id.field); _button = (Button) findViewById(R.id.button); _button.setOnClickListener(new ButtonClickHandler()); _path = DATA_PATH + "/ocr.jpg"; } public class ButtonClickHandler implements View.OnClickListener { public void onClick(View view) { Log.v(TAG, "Starting Camera app"); startCameraActivity(); } } // Simple android photo capture: // http://labs.makemachine.net/2010/03/simple-android-photo-capture/ protected void startCameraActivity() { File file = new File(_path); Uri outputFileUri = Uri.fromFile(file); final Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); intent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri); startActivityForResult(intent, 0); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { Log.i(TAG, "resultCode: " + resultCode); if (resultCode == -1) { onPhotoTaken(); } else { Log.v(TAG, "User cancelled"); } } @Override protected void onSaveInstanceState(Bundle outState) { outState.putBoolean(SimpleAndroidOCRActivity.PHOTO_TAKEN, _taken); } @Override protected void onRestoreInstanceState(Bundle savedInstanceState) { Log.i(TAG, "onRestoreInstanceState()"); if (savedInstanceState.getBoolean(SimpleAndroidOCRActivity.PHOTO_TAKEN)) { onPhotoTaken(); } } protected void onPhotoTaken() { _taken = true; BitmapFactory.Options options = new BitmapFactory.Options(); options.inSampleSize = 4; Bitmap bitmap = BitmapFactory.decodeFile(_path, options); try { ExifInterface exif = new ExifInterface(_path); int exifOrientation = exif.getAttributeInt( ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL); Log.v(TAG, "Orient: " + exifOrientation); int rotate = 0; switch (exifOrientation) { case ExifInterface.ORIENTATION_ROTATE_90: rotate = 90; break; case ExifInterface.ORIENTATION_ROTATE_180: rotate = 180; break; case ExifInterface.ORIENTATION_ROTATE_270: rotate = 270; break; } Log.v(TAG, "Rotation: " + rotate); if (rotate != 0) { // Getting width & height of the given image. int w = bitmap.getWidth(); int h = bitmap.getHeight(); // Setting pre rotate Matrix mtx = new Matrix(); mtx.preRotate(rotate); // Rotating Bitmap bitmap = Bitmap.createBitmap(bitmap, 0, 0, w, h, mtx, false); } // Convert to ARGB_8888, required by tess bitmap = bitmap.copy(Bitmap.Config.ARGB_8888, true); } catch (IOException e) { Log.e(TAG, "Couldn't correct orientation: " + e.toString()); } // _image.setImageBitmap( bitmap ); Log.v(TAG, "Before baseApi"); TessBaseAPI baseApi = new TessBaseAPI(); baseApi.setDebug(true); baseApi.init(DATA_PATH, lang); baseApi.setImage(bitmap); String recognizedText = baseApi.getUTF8Text(); baseApi.end(); // You now have the text in recognizedText var, you can do anything with it. // We will display a stripped out trimmed alpha-numeric version of it (if lang is eng) // so that garbage doesn't make it to the display. Log.v(TAG, "OCRED TEXT: " + recognizedText); if ( lang.equalsIgnoreCase("eng") ) { recognizedText = recognizedText.replaceAll("[^a-zA-Z0-9]+", " "); } recognizedText = recognizedText.trim(); if ( recognizedText.length() != 0 ) { _field.setText(_field.getText().toString().length() == 0 ? recognizedText : _field.getText() + " " + recognizedText); _field.setSelection(_field.getText().toString().length()); } // Cycle done. } //tts @Override public void onDestroy() { // Don't forget to shutdown tts! if (tts != null) { tts.stop(); tts.shutdown(); } super.onDestroy(); } @Override public void onInit(int status) { if (status == TextToSpeech.SUCCESS) { int result = tts.setLanguage(Locale.US); if (result == TextToSpeech.LANG_MISSING_DATA || result == TextToSpeech.LANG_NOT_SUPPORTED) { Log.e("TTS", "This Language is not supported"); } else { btnSpeak.setEnabled(true); speakOut(); } } else { Log.e("TTS", "Initilization Failed!"); } } private void speakOut() { String text = _field.getText().toString(); tts.speak(text, TextToSpeech.QUEUE_FLUSH, null); } } </code></pre> <p>This is my class file, technically, the OCR part of the file is from a sample code, where am I going wrong? I get past the splash screen activity without any problem. I get NullPointer exception, if I commend the btnSpeak lines for View.OnClickListener, I get superOnCreate error, adding super.onCreate doesn't help either.</p> <p>I am clueless.</p> <p>btw, button, button1 and field are id of Button, Button and an EditText respectively.</p>

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