hi,for long i am trying to develop an app which would inform the user
of any incoming message via speech, i have three classes, TextSpeaker,
Receiver and SpeakerService. When i start the app and click on Start
button, i get runtime error:
06-21 13:54:36.088: ERROR/AndroidRuntime(528): Uncaught handler:
thread main exiting due to uncaught exception
06-21 13:54:36.119: ERROR/AndroidRuntime(528):
java.lang.RuntimeException: Unable to start service
com.example.textspeaker.speakerserv...@43bb2ff8 with Intent
{ cmp=com.example.TextSpeaker/.SpeakerService }:
java.lang.NullPointerException
06-21 13:54:36.119: ERROR/AndroidRuntime(528): at
android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2882)
....
06-21 13:54:36.119: ERROR/AndroidRuntime(528): Caused by:
java.lang.NullPointerException
06-21 13:54:36.119: ERROR/AndroidRuntime(528): at
com.example.TextSpeaker.SpeakerService.onStart(SpeakerService.java:33)
06-21 13:54:36.119: ERROR/AndroidRuntime(528): at
android.app.Service.onStartCommand(Service.java:306)
06-21 13:54:36.119: ERROR/AndroidRuntime(528): at
android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2873)
06-21 13:54:36.119: ERROR/AndroidRuntime(528): ... 10 more
Here are my 3 classes: TEXTSPEAKER CLASS:
package com.example.TextSpeaker;
import java.util.Locale;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.speech.tts.TextToSpeech;
import android.speech.tts.TextToSpeech.OnInitListener;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
// the following programme converts the text to speech
public class TextSpeaker extends Activity implements OnInitListener {
/** Called when the activity is first created. */
int MY_DATA_CHECK_CODE = 0;
public TextToSpeech mtts;
public Button button,stop_button;
//public EditText edittext;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
button = (Button)findViewById(R.id.button);
stop_button=(Button)findViewById(R.id.stop_button);
Intent myintent = new Intent();
myintent.setAction(TextToSpeech.Engine.ACTION_CHECK_TTS_DATA);
startActivityForResult(myintent, MY_DATA_CHECK_CODE);
//edit text=(EditText)findViewById(R.id.edittext);
}
public void buttonClickListener(View src){
switch(src.getId())
{
case(R.id.button):
Toast.makeText(getApplicationContext(), "The service has
been started\n Every new message will now be read out",
Toast.LENGTH_LONG).show();
startService(new Intent(this,SpeakerService.class));
break;
case(R.id.stop_button):
Toast.makeText(getApplicationContext(), "The service has
been stopped\n ", Toast.LENGTH_LONG).show();
stopService(new Intent(this,SpeakerService.class));
break;
}
}
protected void onActivityResult(int requestcode,int
resultcode,Intent data)
{
if(requestcode == MY_DATA_CHECK_CODE)
{
if(resultcode==TextToSpeech.Engine.CHECK_VOICE_DATA_PASS)
{
// success so create the TTS engine
mtts = new TextToSpeech(this,this);
mtts.setLanguage(Locale.ENGLISH);
}
else
{
//install the Engine
Intent install = new Intent();
install.setAction(TextToSpeech.Engine.ACTION_INSTALL_TTS_DATA);
startActivity(install);
}
}
}
public void onDestroy(Bundle savedInstanceStatBundle)
{
mtts.shutdown();
}
//public void onPause()
//{
// super.onPause();
// // if our app has no focus
// if(mtts!=null)
// mtts.stop();
// }
@Override
public void onInit(int status) {
if(status==TextToSpeech.SUCCESS)
button.setEnabled(true);
}
}
RECEIVER CLASS:
package com.example.TextSpeaker;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.telephony.SmsMessage; // supports both gsm and cdma
import android.util.Log;
import android.widget.Toast;
public class Receiver extends BroadcastReceiver{
//TextSpeaker tsp=new TextSpeaker();
public String str="";
@Override
public void onReceive(Context context, Intent intent) {
Bundle bundle = intent.getExtras();
Log.d("Receiver","Message received successfully");
SmsMessage[] msgs = null;
if(bundle!=null)
{
// retrive the sms received
Object[] pdus = (Object[])bundle.get("pdus");
msgs = new SmsMessage[pdus.length];
for(int i=0;i<msgs.length;i++)
{
msgs[i]=SmsMessage.createFromPdu((byte[]) pdus[i]);
str+="Message From "+msgs[i].getOriginatingAddress()+".";
str+="The message is
"+msgs[i].getMessageBody().toString();
}
Toast.makeText(context,str,Toast.LENGTH_SHORT).show();
}
}
}
SERVICESPEAKER CLASS:
package com.example.TextSpeaker;
import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.speech.tts.TextToSpeech;
import android.util.Log;
import android.widget.Toast;
public class SpeakerService extends Service {
Receiver rv = new Receiver();
TextSpeaker tspker = new TextSpeaker();
//public TextToSpeech mtts;
@Override
public IBinder onBind(Intent arg0) {
// TODO Auto-generated method stub
return null;
}
@Override
public void onCreate(){
//mtts =new TextToSpeech(getBaseContext(), null);
Log.d("SpeakerService","Service created successfully!");
//mtts.speak(rv.str, TextToSpeech.QUEUE_FLUSH,null);
}
@Override
public void onStart(Intent intent,int startid)
{
Log.d("SpeakerService","Service started successfully!");
tspker.mtts.speak(rv.str, TextToSpeech.QUEUE_FLUSH,null);
}
@Override
public void onDestroy(){
if(tspker.mtts!=null)
{
tspker.mtts.stop();
Toast.makeText(getApplicationContext(),"The service has been
destroyed!", Toast.LENGTH_SHORT).show();
}
}
}
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