0

每当我尝试在我的设备上运行代码时都会收到此错误，请告诉我我哪里出错了：

07-08 19:32:46.159: E/AndroidRuntime(21554): FATAL EXCEPTION: main
07-08 19:32:46.159: E/AndroidRuntime(21554): java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=0, result=-1, data=null} to activity {com.datumdroid.android.ocr.simple/com.datumdroid.android.ocr.simple.SimpleAndroidOCRActivity}: java.lang.NullPointerException
07-08 19:32:46.159: E/AndroidRuntime(21554):    at android.app.ActivityThread.deliverResults(ActivityThread.java:3182)
07-08 19:32:46.159: E/AndroidRuntime(21554):    at android.app.ActivityThread.handleSendResult(ActivityThread.java:3225)
07-08 19:32:46.159: E/AndroidRuntime(21554):    at android.app.ActivityThread.access$1100(ActivityThread.java:140)
07-08 19:32:46.159: E/AndroidRuntime(21554):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1275)
07-08 19:32:46.159: E/AndroidRuntime(21554):    at android.os.Handler.dispatchMessage(Handler.java:99)
07-08 19:32:46.159: E/AndroidRuntime(21554):    at android.os.Looper.loop(Looper.java:137)
07-08 19:32:46.159: E/AndroidRuntime(21554):    at android.app.ActivityThread.main(ActivityThread.java:4898)
07-08 19:32:46.159: E/AndroidRuntime(21554):    at java.lang.reflect.Method.invokeNative(Native Method)
07-08 19:32:46.159: E/AndroidRuntime(21554):    at java.lang.reflect.Method.invoke(Method.java:511)
07-08 19:32:46.159: E/AndroidRuntime(21554):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1008)
07-08 19:32:46.159: E/AndroidRuntime(21554):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:775)
07-08 19:32:46.159: E/AndroidRuntime(21554):    at dalvik.system.NativeStart.main(Native Method)
07-08 19:32:46.159: E/AndroidRuntime(21554): Caused by: java.lang.NullPointerException
07-08 19:32:46.159: E/AndroidRuntime(21554):    at com.datumdroid.android.ocr.simple.SimpleAndroidOCRActivity.speakWords(SimpleAndroidOCRActivity.java:239)
07-08 19:32:46.159: E/AndroidRuntime(21554):    at com.datumdroid.android.ocr.simple.SimpleAndroidOCRActivity.onPhotoTaken(SimpleAndroidOCRActivity.java:207)
07-08 19:32:46.159: E/AndroidRuntime(21554):    at com.datumdroid.android.ocr.simple.SimpleAndroidOCRActivity.onActivityResult(SimpleAndroidOCRActivity.java:123)
07-08 19:32:46.159: E/AndroidRuntime(21554):    at android.app.Activity.dispatchActivityResult(Activity.java:5390)
07-08 19:32:46.159: E/AndroidRuntime(21554):    at android.app.ActivityThread.deliverResults(ActivityThread.java:3178)
07-08 19:32:46.159: E/AndroidRuntime(21554):    ... 11 more

代码是

package com.datumdroid.android.ocr.simple;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import android.app.Activity;
import android.content.Intent;
import android.content.res.AssetManager;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.media.ExifInterface;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.speech.tts.TextToSpeech;
import com.googlecode.tesseract.android.TessBaseAPI;

public class SimpleAndroidOCRActivity extends Activity {
public static final String PACKAGE_NAME = "com.datumdroid.android.ocr.simple";
public static final String DATA_PATH = Environment
        .getExternalStorageDirectory().toString() + "/SimpleAndroidOCR/";


public static final String lang = "eng";

private static final String TAG = "SimpleAndroidOCR.java";

protected Button _button;
// protected ImageView _image;
protected EditText _field;
protected String _path;
protected boolean _taken;
private TextToSpeech myTTS;

private int MY_DATA_CHECK_CODE = 0;

protected static final String PHOTO_TAKEN = "photo_taken";

@Override
public void onCreate(Bundle savedInstanceState) {

     Intent checkTTSIntent = new Intent();
        checkTTSIntent.setAction(TextToSpeech.Engine.ACTION_CHECK_TTS_DATA);
        startActivityForResult(checkTTSIntent, MY_DATA_CHECK_CODE);


    // 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();
    speakWords(recognizedText);
    // 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.

}

private void speakWords(String speech) {

    //speak straight away
    myTTS.speak(speech, TextToSpeech.QUEUE_FLUSH, null);
}


}
4

2 回答 2

2

问题出在以下行

myTTS.speak(speech, TextToSpeech.QUEUE_FLUSH, null);

您正在使用 myTTS 而不对其进行初始化。在调用任何对象的任何成员方法之前，您需要先对其进行初始化

要了解有关 TextToSpeech api 的详细信息，请参阅此处的文档

于 2013-07-08T14:25:00.953 回答
0

为什么这么晚才初始化Activity？以下几行不应该只是 oncreate 的前两行吗？

super.onCreate(savedInstanceState);
setContentView(R.layout.main);

它不像您正在更新savedInstanceState或布局文件？

于 2013-07-08T14:27:59.027 回答