Question

我刚刚开始学习制作Android应用程序，并且正在我的Android Studio上尝试使用此语音识别应用程序。当我按下RUN时，仿真器Api 29打开，显示空白页，然后使用CLOSE APP关闭！窗口。它在我的Android手机Api 24上执行相同的操作。

我经历了与您过去的成员相关的所有可能原因，但没有找到类似的解决方案。

public class MainActivity extends AppCompatActivity{

         private static final int MY_PERMISSIONS_RECORD_AUDIO = 1;   // MIC PERMISSION VARIABLE
        // private static final int REQUEST_RECORD_PERMISSION = 1;

          android.speech.tts.TextToSpeech TTS;   //variable del TextToSpeech
          SpeechRecognizer speechRecog;

         private android.widget.ProgressBar progressBar;
         private SpeechRecognizer speech = null;
         private android.content.Intent recognizerIntent;
         private String LOG_TAG = "VoiceRecognitionActivity";



    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //android.widget.TextView returnedText = (findViewById(R.id.textView1));
        progressBar = (findViewById(R.id.progressBar1));
        android.widget.ToggleButton toggleButton = (findViewById(R.id.toggleButton1));
        progressBar.setVisibility(android.view.View.INVISIBLE);


        final SpeechRecognizer speech = SpeechRecognizer
                .createSpeechRecognizer(MainActivity.this);


        android.util.Log.i(LOG_TAG, "isRecognitionAvailable: " + SpeechRecognizer.isRecognitionAvailable(this));

        speech.setRecognitionListener((android.speech.RecognitionListener) this);
        recognizerIntent = new android.content.Intent(android.speech.RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
        recognizerIntent.putExtra(android.speech.RecognizerIntent.EXTRA_LANGUAGE_PREFERENCE,  "en");

        recognizerIntent.putExtra(android.speech.RecognizerIntent.EXTRA_LANGUAGE_MODEL,
                android.speech.RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);
        recognizerIntent.putExtra(android.speech.RecognizerIntent.EXTRA_MAX_RESULTS, 3);

        toggleButton.setOnCheckedChangeListener(new android.widget.CompoundButton.OnCheckedChangeListener() {


            public void onCheckedChanged(android.widget.CompoundButton buttonView,
                                         boolean isChecked) {

                if (isChecked) {
                    progressBar.setVisibility(android.view.View.VISIBLE);
                    progressBar.setIndeterminate(true);

                } else {


                    progressBar.setIndeterminate(false);
                    progressBar.setVisibility(android.view.View.INVISIBLE);
                    speech.stopListening();
                }
            }
        });

这里是LOGCAT的副本

2019-07-11 14:58:46.703 32610-32610/com.example.speech_recognition E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.speech_recognition, PID: 32610
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.speech_recognition/com.example.speech_recognition.MainActivity}: java.lang.ClassCastException: com.example.speech_recognition.MainActivity cannot be cast to android.speech.RecognitionListener
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3260)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3396)
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2009)
        at android.os.Handler.dispatchMessage(Handler.java:107)
        at android.os.Looper.loop(Looper.java:214)
        at android.app.ActivityThread.main(ActivityThread.java:7319)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:934)
     Caused by: java.lang.ClassCastException: com.example.speech_recognition.MainActivity cannot be cast to android.speech.RecognitionListener
        at com.example.speech_recognition.MainActivity.onCreate(MainActivity.java:51)
        at android.app.Activity.performCreate(Activity.java:7783)
        at android.app.Activity.performCreate(Activity.java:7772)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1299)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3235)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3396) 
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83) 
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135) 
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2009) 
        at android.os.Handler.dispatchMessage(Handler.java:107) 
        at android.os.Looper.loop(Looper.java:214) 
        at android.app.ActivityThread.main(ActivityThread.java:7319) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:934) 
2019-07-11 14:58:46.739 32610-32610/com.example.speech_recognition I/Process: Sending signal. PID: 32610 SIG: 9

Answer 1

此行失败：

speech.setRecognitionListener((android.speech.RecognitionListener) this);

问题在于您的MainActivity未实现接口RecognitionListener，因此无法将其强制转换为该类型。

为什么我的android应用在启动时崩溃

1 个答案: