我想创建一个可以逐个询问用户2个号码的应用。 然后将它们相乘并告诉用户结果。 但是当我尝试将用户的语音字符串转换为double时，我的应用程序崩溃了。 这是我的代码：
num1 = Double.parseDouble(String.valueOf(matches));
（num1是double，match是用户语音的字符串形式） 如果你需要更多代码，请告诉我。 提前谢谢！
编辑：这是整个活动_
package cannon.gaming.physicsdroidvoice;
import android.content.Intent;
import android.content.SharedPreferences;
import android.speech.RecognitionListener;
import android.speech.RecognizerIntent;
import android.speech.SpeechRecognizer;
import android.speech.tts.TextToSpeech;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.WindowManager;
import android.widget.RelativeLayout;
import java.io.File;
import java.util.ArrayList;
import java.util.Timer;
import java.util.TimerTask;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class MainActivity extends ActionBarActivity {
private SpeechRecognizer mSpeechRecognizer;
private Intent mSpeechRecognizerIntent;
private boolean mIslistening;
int forza, m, a;
double mass, acc, mares;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getSupportActionBar().hide();
this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_main);
forza = 0;
m = 0;
mass = 0;
a = 0;
acc = 0;
mares = 0;
final String abc = "Welcome to PhysicsDroid!";
final String abcc = "What do you need?";
final String abccc = "Force, Velocity, Mass, Acceleration, Distance, Time, Temperature, Work, Density, Info, or Exit?";
final String abcccc = "Just tap the screen and speak. When you are done, tap the screen again.";
final String abccccc = "Can you repeat please?";
final String force = "Which force equation would you like to use?";
final String exit = "Thank you for using PhysicsDroid, see ya!";
final String one = "First one: F=m times A. Second one: F=p times A. Or third one: Fg=G times m1m2 over r squared?";
final String ma = "What is the mass of object in kilograms?";
final String am = "What is the acceleration of object in meters per second squared?";
final String mnum = "What the...!";
final TextToSpeech home = new TextToSpeech(MainActivity.this, new TextToSpeech.OnInitListener() {
@Override
public void onInit(int status) {
if (status != TextToSpeech.ERROR) {
//DO NOTHING
}
}
});
new Timer().schedule(
new TimerTask() {
@Override
public void run()
{
home.speak(abc, TextToSpeech.QUEUE_ADD, null);
home.speak(abcc, TextToSpeech.QUEUE_ADD, null);
home.speak(abccc, TextToSpeech.QUEUE_ADD, null);
home.speak(abcccc, TextToSpeech.QUEUE_ADD, null);
}
},
1000
);
mSpeechRecognizer = SpeechRecognizer.createSpeechRecognizer(this);
mSpeechRecognizerIntent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
mSpeechRecognizerIntent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL,
RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);
mSpeechRecognizerIntent.putExtra(RecognizerIntent.EXTRA_CALLING_PACKAGE,
this.getPackageName());
class SpeechRecognitionListener implements RecognitionListener
{
@Override
public void onBeginningOfSpeech()
{
//Log.d(TAG, "onBeginingOfSpeech");
}
@Override
public void onBufferReceived(byte[] buffer)
{
}
@Override
public void onEndOfSpeech()
{
//Log.d(TAG, "onEndOfSpeech");
}
@Override
public void onError(int error)
{
//Log.d(TAG, "error = " + error);
}
@Override
public void onEvent(int eventType, Bundle params)
{
}
@Override
public void onPartialResults(Bundle partialResults)
{
}
@Override
public void onReadyForSpeech(Bundle params)
{
//Log.d(TAG, "onReadyForSpeech"); //$NON-NLS-1$
}
@Override
public void onResults(Bundle results)
{
//Log.d(TAG, "onResults"); //$NON-NLS-1$
ArrayList<String> matches = results.getStringArrayList(SpeechRecognizer.RESULTS_RECOGNITION);
CharSequence cs1 = "Force";
CharSequence cs2 = "force";
CharSequence cs3 = "Exit";
CharSequence cs4 = "exit";
CharSequence cs5 = "First";
CharSequence cs6 = "first";
CharSequence cs7 = "times";
CharSequence cs8 = "equals";
Pattern p = Pattern.compile("[a-zA-Z]");
Matcher mat = p.matcher("3453443534534");
if(forza == 1 && m == 0 && a == 0)
{
if(String.valueOf(matches).contains(cs5) || String.valueOf(matches).contains(cs6) || String.valueOf(matches).contains(cs7) || String.valueOf(matches).contains(cs8))
{
home.speak(ma,TextToSpeech.QUEUE_FLUSH, null);
forza = 0;
m = 1;
}
}
else if(m == 1 && forza == 0 && a == 0)
{
if(String.valueOf(matches).matches(".*\\d.*"))
{
mass = Double.parseDouble(String.valueOf(matches));
home.speak(am,TextToSpeech.QUEUE_FLUSH, null);
m = 0;
a = 1;
home.speak(mnum,TextToSpeech.QUEUE_FLUSH, null);
}
else
{
home.speak(mnum,TextToSpeech.QUEUE_FLUSH, null);
}
}
else if(a == 1 && m == 0 && forza == 0)
{
if(String.valueOf(matches).contains("[a-zA-Z]+") || String.valueOf(matches).equals("") || String.valueOf(matches).equals(".") || String.valueOf(matches).equals("-.") || String.valueOf(matches).equals("-"))
{
home.speak(mnum,TextToSpeech.QUEUE_FLUSH, null);
}
else
{
acc = Double.parseDouble(String.valueOf(matches));
a = 0;
mares = mass * acc;
String mare = String.format("The force is %d", mares);
home.speak(mare,TextToSpeech.QUEUE_FLUSH, null);
}
}
else if(String.valueOf(matches).contains(cs1) || String.valueOf(matches).contains(cs2) && forza == 0 && m == 0 && a == 0)
{
home.speak(force,TextToSpeech.QUEUE_FLUSH, null);
home.speak(one,TextToSpeech.QUEUE_ADD, null);
forza = 1;
}
else if(String.valueOf(matches).contains(cs3) || String.valueOf(matches).contains(cs4) && forza == 0 && m == 0 && a == 0)
{
home.speak(exit,TextToSpeech.QUEUE_FLUSH, null);
new Timer().schedule(
new TimerTask() {
@Override
public void run() {
android.os.Process.killProcess(android.os.Process.myPid());
System.exit(1);
}
},
4000
);
}
else
{
home.speak(abccccc,TextToSpeech.QUEUE_FLUSH, null);
}
// matches are the return values of speech recognition engine
// Use these values for whatever you wish to do
}
@Override
public void onRmsChanged(float rmsdB)
{
}
}
SpeechRecognitionListener listener = new SpeechRecognitionListener();
mSpeechRecognizer.setRecognitionListener(listener);
RelativeLayout rlayout = (RelativeLayout) findViewById(R.id.MainActivity);
rlayout.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v)
{
boolean mIsListening = false;
if (!mIsListening)
{
mSpeechRecognizer.startListening(mSpeechRecognizerIntent);
}
else
{
mSpeechRecognizer.cancel();
}
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
答案 0 :(得分：0)
确保匹配不为null或者为double。
您可以使用try catch来检查匹配项是否是运行时的数字。如果matches是一个字符串，你也不应该需要String.valueOf。
try {
num1 = Double.parseDouble(matches);
} catch (NumberFormatException e) {
e.pritStackTrace();
}
还要确保num1已初始化。