Question

我有一个项目，使用RecognizerIntent.ACTION_RECOGNIZE_SPEECH

调用android的默认语音识别系统

UI是1个textview和1个命令按钮，分别显示语音识别结果和开始语音识别

我还使用此处显示的方法在AMR文件中录制语音识别器的输入：

record/save audio from voice recognition intent

这是可能的，因为语音识别器的输入音频在语音识别器活动返回的InputStream中以Intent data形式提供

但是，我注意到当语音识别器活动无法识别语音（与错误识别不同）时，仍会调用onActivityResult(...)函数，但它不会返回Intent data，从而导致NullPointerException在尝试读取AMR文件时。当语音识别器无法识别语音时，如何获得语音识别器的输入？

代码：

import android.content.ContentResolver;
import android.content.Intent;
import android.net.Uri;
import android.os.Environment;
import android.speech.RecognizerIntent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Locale;

public class MainActivity extends AppCompatActivity {

    Button btnSpeak;
    TextView txtViewResult;
    private static final int VOICE_RECOGNITION = 1;
    String saveFileLoc = Environment.getExternalStorageDirectory().getPath();
    File fileAmrFile = new File(saveFileLoc+"/recordedSpeech.amr");
    OutputStream outputStream = null;
    InputStream filestream = null;
    Uri audioUri = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        btnSpeak = (Button)findViewById(R.id.button1);
        txtViewResult = (TextView)findViewById(R.id.textView1);

        if(fileAmrFile.exists() ){
            fileAmrFile.delete();
        }

        runprog();



    }   // protected void onCreate(Bundle savedInstanceState) { CLOSED


    private void runprog(){

        btnSpeak.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View view) {
                // Toast.makeText(getApplicationContext(), "Button pressed", Toast.LENGTH_LONG).show();
                // Fire an intent to start the speech recognition activity.
                Intent intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);

                // Specify free form input
                intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL, RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);
                intent.putExtra(RecognizerIntent.EXTRA_PROMPT,"Please start speaking");
                intent.putExtra(RecognizerIntent.EXTRA_MAX_RESULTS, 1);
                intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE, Locale.ENGLISH);

                // secret parameters that when added provide audio url in the result
                intent.putExtra("android.speech.extra.GET_AUDIO_FORMAT", "audio/AMR");
                intent.putExtra("android.speech.extra.GET_AUDIO", true);

                startActivityForResult(intent, VOICE_RECOGNITION);
            }
        });
    }       // private void runprog(){ CLOSED

    // handle result of speech recognition
    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        // if (requestCode == VOICE_RECOGNITION && resultCode == RESULT_OK) {
        if (requestCode == VOICE_RECOGNITION ) {
            ArrayList<String> results;
            results = data.getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS);
            txtViewResult.setText(results.get(0));
            Log.v("MYLOG", "Speech 2 text");

            // the required audio will be returned by getExtras:
            Bundle bundle = data.getExtras();
            ArrayList<String> matches = bundle.getStringArrayList(RecognizerIntent.EXTRA_RESULTS);

            // Toast.makeText(getApplicationContext(), "HEREHERE", Toast.LENGTH_LONG).show();


            Log.v("MYLOG", "B4 Uri creation");

        // /*
            // the recording url is in getData:
            audioUri = data.getData();
            ContentResolver contentResolver = getContentResolver();
            try {
                filestream = contentResolver.openInputStream(audioUri);
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }
            // TODO: read audio file from inputstream

            try {
                outputStream = new FileOutputStream(new File(saveFileLoc + "/recordedSpeech.wav"));
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }

            try {

                int read = 0;
                byte[] bytes = new byte[1024];

                while ((read = filestream.read(bytes)) != -1) {
                    outputStream.write(bytes, 0, read);
                }

                // System.out.println("Done!");
                Toast.makeText(getApplicationContext(), "Done", Toast.LENGTH_LONG).show();

            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                if (filestream != null) {
                    try {
                        filestream.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
                if (outputStream != null) {
                    try {
                        // outputStream.flush();
                        outputStream.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }

                }
            }
          // */
        }
    }       // public void onActivityResult(int requestCode, int resultCode, Intent data) { CLOSED


}   // protected void onCreate(Bundle savedInstanceState) { CLOSED

layout.xml：

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/spoken" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/textView1"
        android:layout_below="@+id/textView1"
        android:text="@string/button_text"
         />

</LinearLayout>

作为参考，这就是我说the speech recogniser fails to recognise speech时的意思（请注意，这与语音识别器错误检测时的情况不同;如果检测错误，仍然会识别语音）

电话详情：

型号：三星Galaxy S4
型号：SHV-E330L
Android版本：5.01

当无法返回结果时，如何将音频输入到android默认语音识别器

0 个答案: