Android Studio“仅当我说“ Hello Bob”时才应激活功能”

Question

我想为Android编写应用程序！我的问题：如果我的应用程序处于打开状态，则仅当我通过麦克风“ Hello Bob”告诉我的应用程序时才继续。因此，就像“ Hello Google”然后出现一个窗口一样，我希望我的应用程序具有相同的功能，但（仅）当我的应用程序打开时。所以不要在后台！

所以我要：如果我说“ Hello Bob”，则应用程序在TextView中编写了例如“ Hello Chreys”的文字。

如果我会说我会说的口头文字，那会有所帮助！

package at.chreys.speech;

import ...

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity implements
        RecognitionListener {

    private static final int REQUEST_RECORD_PERMISSION = 100;
    private TextView returnedText;
    private ToggleButton toggleButton;
    private ProgressBar progressBar;
    private SpeechRecognizer speech = null;
    private Intent recognizerIntent;
    private String LOG_TAG = "VoiceRecognitionActivity";

    public static String getErrorText(int errorCode) {
        String message;
        switch (errorCode) {
            case SpeechRecognizer.ERROR_AUDIO:
                message = "Audio recording error";
                break;
            case SpeechRecognizer.ERROR_CLIENT:
                message = "Client side error";
                break;
            case SpeechRecognizer.ERROR_INSUFFICIENT_PERMISSIONS:
                message = "Insufficient permissions";
                break;
            case SpeechRecognizer.ERROR_NETWORK:
                message = "Network error";
                break;
            case SpeechRecognizer.ERROR_NETWORK_TIMEOUT:
                message = "Network timeout";
                break;
            case SpeechRecognizer.ERROR_NO_MATCH:
                message = "No match";
                break;
            case SpeechRecognizer.ERROR_RECOGNIZER_BUSY:
                message = "RecognitionService busy";
                break;
            case SpeechRecognizer.ERROR_SERVER:
                message = "error from server";
                break;
            case SpeechRecognizer.ERROR_SPEECH_TIMEOUT:
                message = "No speech input";
                break;
            default:
                message = "Didn't understand, please try again.";
                break;
        }
        return message;
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        returnedText = (TextView) findViewById(R.id.textView1);
        progressBar = (ProgressBar) findViewById(R.id.progressBar1);
        toggleButton = (ToggleButton) findViewById(R.id.toggleButton1);


        progressBar.setVisibility(View.INVISIBLE);
        speech = SpeechRecognizer.createSpeechRecognizer(this);
        Log.i(LOG_TAG, "isRecognitionAvailable: " + SpeechRecognizer.isRecognitionAvailable(this));
        speech.setRecognitionListener(this);
        recognizerIntent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
        recognizerIntent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_PREFERENCE,
                "en");
        recognizerIntent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL,
                RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);
        recognizerIntent.putExtra(RecognizerIntent.EXTRA_MAX_RESULTS, 3);

        toggleButton.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {

            @Override
            public void onCheckedChanged(CompoundButton buttonView,
                                         boolean isChecked) {
                if (isChecked) {
                    progressBar.setVisibility(View.VISIBLE);
                    progressBar.setIndeterminate(true);
                    ActivityCompat.requestPermissions
                            (MainActivity.this,
                                    new String[]{Manifest.permission.RECORD_AUDIO},
                                    REQUEST_RECORD_PERMISSION);
                } else {
                    progressBar.setIndeterminate(false);
                    progressBar.setVisibility(View.INVISIBLE);
                    speech.stopListening();
                }
            }
        });

    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        switch (requestCode) {
            case REQUEST_RECORD_PERMISSION:
                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    speech.startListening(recognizerIntent);
                } else {
                    Toast.makeText(MainActivity.this, "Permission Denied!", Toast
                            .LENGTH_SHORT).show();
                }
        }
    }

    @Override
    public void onResume() {
        super.onResume();
    }

    @Override
    protected void onPause() {
        super.onPause();

    }

    @Override
    protected void onStop() {
        super.onStop();
        if (speech != null) {
            speech.destroy();
            Log.i(LOG_TAG, "destroy");
        }
    }

    @Override
    public void onBeginningOfSpeech() {
        Log.i(LOG_TAG, "onBeginningOfSpeech");
        progressBar.setIndeterminate(false);
        progressBar.setMax(10);
    }

    @Override
    public void onBufferReceived(byte[] buffer) {
        Log.i(LOG_TAG, "onBufferReceived: " + buffer);
    }

    @Override
    public void onEndOfSpeech() {
        Log.i(LOG_TAG, "onEndOfSpeech");
        progressBar.setIndeterminate(true);
        toggleButton.setChecked(false);
    }

    @Override
    public void onError(int errorCode) {
        String errorMessage = getErrorText(errorCode);
        Log.d(LOG_TAG, "FAILED " + errorMessage);
        returnedText.setText(errorMessage);
        toggleButton.setChecked(false);
    }

    @Override
    public void onEvent(int arg0, Bundle arg1) {
        Log.i(LOG_TAG, "onEvent");
    }

    @Override
    public void onPartialResults(Bundle arg0) {
        Log.i(LOG_TAG, "onPartialResults");
    }

    @Override
    public void onReadyForSpeech(Bundle arg0) {
        Log.i(LOG_TAG, "onReadyForSpeech");
    }

    @Override
    public void onResults(Bundle results) {
        Log.i(LOG_TAG, "onResults");
        ArrayList<String> matches = results
                .getStringArrayList(SpeechRecognizer.RESULTS_RECOGNITION);
        String text = "";
        for (String result : matches)
            text += result + "\n";

        returnedText.setText(text);
    }

    @Override
    public void onRmsChanged(float rmsdB) {
        Log.i(LOG_TAG, "onRmsChanged: " + rmsdB);
        progressBar.setProgress((int) rmsdB);
    }
}