Develop Reference

setOnUtteranceProgressListener not at all working for Text To Speech for API > 21

I want setOnUtteranceProgressListener should notify a Toast after the speech is completed.It seems not working.
I have used setOnUtteranceProgressListener and on the speak function i have mentioned the paramaters as follows..
Bundle params = new Bundle();
params.putString(TextToSpeech.Engine.KEY_PARAM_UTTERANCE_ID, MainActivity.this.getPackageName());
I have given a "UniqueId" while calling speak function as follows.
myTTS.speak(message,TextToSpeech.QUEUE_FLUSH,params,"UniqueId");
In My program after the text to speech engine finishes speaking it should run a Toast notifying that it has finished speaking.But the setOnUtteranceProgressListner seems not working.
myTTS.setOnUtteranceProgressListener(new UtteranceProgressListener() {
#Override
public void onStart(String utteranceId) {
}
#Override
public void onDone(String utteranceId) {
Toast.makeText(MainActivity.this,"Finished speaking.",Toast.LENGTH_LONG).show();
}
#Override
public void onError(String utteranceId) {
}
});
The all Code is as follows..
public class MainActivity extends AppCompatActivity {
String message;
private TextToSpeech myTTS;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myTTS = new TextToSpeech(this, new TextToSpeech.OnInitListener() {
#Override
public void onInit(int status) {
if(myTTS.getEngines().size() == 0){
Toast.makeText(MainActivity.this,"No Engines Installed",Toast.LENGTH_LONG).show();
}else{
myTTS.setLanguage(Locale.US);
if (status == TextToSpeech.SUCCESS){
//Toast.makeText(MainActivity.this,"Status working.",Toast.LENGTH_LONG).show();
message = "How may i help you.";
}
}
}
});
myTTS.setOnUtteranceProgressListener(new UtteranceProgressListener() {
#Override
public void onStart(String utteranceId) {
}
#Override
public void onDone(String utteranceId) {
Toast.makeText(MainActivity.this,"onDone working.",Toast.LENGTH_LONG).show();
}
#Override
public void onError(String utteranceId) {
}
});
}
Please give a solution for this.

The main problems are:
1) Setting the progress listener before the tts is initialized.
2) Trying to make a Toast from a background thread.
I also have some other suggested changes but they are not required:
public class MainActivity extends AppCompatActivity {
String message = "How may I help you?";
String mostRecentUtteranceID;
private TextToSpeech myTTS;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myTTS = new TextToSpeech(this, new TextToSpeech.OnInitListener() {
#Override
public void onInit(int status) {
if(myTTS.getEngines().size() == 0){
Toast.makeText(MainActivity.this,"No Engines Installed",Toast.LENGTH_LONG).show();
}else{
if (status == TextToSpeech.SUCCESS){
ttsInitialized();
}
}
}
});
}
private void ttsInitialized() {
// *** set UtteranceProgressListener AFTER tts is initialized ***
myTTS.setOnUtteranceProgressListener(new UtteranceProgressListener() {
#Override
public void onStart(String utteranceId) {
}
#Override
// this method will always called from a background thread.
public void onDone(String utteranceId) {
// only respond to the most recent utterance
if (!utteranceId.equals(mostRecentUtteranceID)) {
Log.i("XXX", "onDone() blocked: utterance ID mismatch.");
return;
} // else continue...
boolean wasCalledFromBackgroundThread = (Thread.currentThread().getId() != 1);
Log.i("XXX", "was onDone() called on a background thread? : " + wasCalledFromBackgroundThread);
Log.i("XXX", "onDone working.");
// for demonstration only... avoid references to
// MainActivity (unless you use a WeakReference)
// inside the onDone() method, as it
// can cause a memory leak.
runOnUiThread(new Runnable() {
#Override
public void run() {
// *** toast will not work if called from a background thread ***
Toast.makeText(MainActivity.this,"onDone working.",Toast.LENGTH_LONG).show();
}
});
}
#Override
public void onError(String utteranceId) {
}
});
// set Language
myTTS.setLanguage(Locale.US);
// set unique utterance ID for each utterance
mostRecentUtteranceID = (new Random().nextInt() % 9999999) + ""; // "" is String force
// set params
// *** this method will work for more devices: API 19+ ***
HashMap<String, String> params = new HashMap<>();
params.put(TextToSpeech.Engine.KEY_PARAM_UTTERANCE_ID, mostRecentUtteranceID);
myTTS.speak(message,TextToSpeech.QUEUE_FLUSH,params);
}
}

If you want to add the call back OnUtteranceProgressListener you have to implement the speak method like this:
myTTS.speak(message,TextToSpeech.QUEUE_FLUSH, null , TextToSpeech.Engine.KEY_PARAM_UTTERANCE_ID);
Then it will call the methods that you've already implemented (onStart, onDone, etc)

Try to invoke virtual method on a null object reference [duplicate]

This question already has answers here:
What is a NullPointerException, and how do I fix it?
(12 answers)
Closed 5 years ago.
I am trying to make a barcode scanner app, and I want to add scan results to a certain list. In the MainActivity, I have a certain button that should send me to MyList activity, but then the app crashes and I don't know how to solve it.
So here is my code:
public class MainActivity extends AbsRuntimePermission implements ZXingScannerView.ResultHandler{
private ZXingScannerView zXingScannerView;
private static final int REQUEST_PERMISSION = 10;
boolean ok = false, chk = false;
private String scanResult;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
chk = getIntent().getBooleanExtra("check", chk);
if(chk) {
chk = false;
ok = true;
zXingScannerView = new ZXingScannerView(getApplicationContext());
setContentView(zXingScannerView);
zXingScannerView.setResultHandler(this);
zXingScannerView.startCamera();
}
}
public void scan(View view){
requestAppPermissions(new String[]{Manifest.permission.CAMERA}, R.string.msg, REQUEST_PERMISSION);
ok = true;
zXingScannerView = new ZXingScannerView(getApplicationContext());
setContentView(zXingScannerView);
zXingScannerView.setResultHandler(this);
zXingScannerView.startCamera();
}
#Override
public void onPermissionGranted(int requestCode) {
if(ok)
Toast.makeText(getApplicationContext(), "Permission Granted", Toast.LENGTH_LONG).show();
}
#Override
public void onResume(){
super.onResume();
if(ok)
{
if(zXingScannerView == null)
{
zXingScannerView = new ZXingScannerView(this);
setContentView(zXingScannerView);
}
zXingScannerView.setResultHandler(this);
zXingScannerView.startCamera();
}
}
#Override
protected void onPause() {
super.onPause();
zXingScannerView.stopCamera();
}
#Override
public void handleResult(final Result result) {
scanResult = result.getText();
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Result");
builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
zXingScannerView.resumeCameraPreview(MainActivity.this);
}
});
builder.setNeutralButton("GO", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
try
{
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(scanResult));
startActivity(intent);
}catch (Exception ex)
{
Intent intent = new Intent(Intent.ACTION_WEB_SEARCH);
intent.putExtra(SearchManager.QUERY, scanResult);
startActivity(intent);
}
}
});
builder.setNegativeButton("Add to list", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
Intent intent = new Intent(MainActivity.this, MyList.class);
intent.putExtra("CODE", scanResult);
startActivity(intent);
}
});
builder.setMessage(scanResult);
AlertDialog alert = builder.create();
alert.show();
}
public void Lista(View view){
Intent iNtent = new Intent(MainActivity.this, MyList.class);
startActivity(iNtent);
}
}`
And this is my error report:
01-12 09:42:26.013 2670-2670/com.example.tchibo.justqr E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.tchibo.justqr, PID: 2670
java.lang.RuntimeException: Unable to pause activity {com.example.tchibo.justqr/com.example.tchibo.justqr.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void me.dm7.barcodescanner.zxing.ZXingScannerView.stopCamera()' on a null object reference at android.app.ActivityThread.performPauseActivityIfNeeded(ActivityThread.java:3976)
at android.app.ActivityThread.performPauseActivity(ActivityThread.java:3942)
at android.app.ActivityThread.performPauseActivity(ActivityThread.java:3916)
at android.app.ActivityThread.handlePauseActivity(ActivityThread.java:3890)
at android.app.ActivityThread.-wrap15(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1605)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6541)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void me.dm7.barcodescanner.zxing.ZXingScannerView.stopCamera()' on a null object reference
Actually, it says that is trying to invoke virtual method void me.dm7.barcodescanner.zxing.ZXingScannerView.stopCamera() on a null object reference.
(sorry for the post style but i'm not familiar with it)

Well you create method scan(View view) in this method you initialize your camera(ZXingScannerView ) object but din't call anywhere. have look for solution
in onCreate():
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
chk = getIntent().getBooleanExtra("check", chk);
zXingScannerView = new ZXingScannerView(getApplicationContext());
if(chk) {
chk = false;
ok = true;
zXingScannerView = new ZXingScannerView(getApplicationContext());
setContentView(zXingScannerView);
zXingScannerView.setResultHandler(this);
zXingScannerView.startCamera();
}
}
in onPause()
#Override
protected void onPause() {
super.onPause();
if(zXingScannerView!=null)
zXingScannerView.stopCamera();
}

You can check zXingScannerView before using it.
if (zXingScannerView != null){
zXingScannerView.stopCamera();
}

java.lang.RuntimeException: Unable to pause activity
{com.example.tchibo.justqr/com.example.tchibo.justqr.MainActivity}:
java.lang.NullPointerException: Attempt to invoke virtual method 'void
me.dm7.barcodescanner.zxing.ZXingScannerView.stopCamera()' on a null
object reference
the logcat is telling you the problem, which is this line :
zXingScannerView.stopCamera();
your app is trying to stop something that does not exist !!
trivial solution :
if(zXingScannerView!=null){
zXingScannerView.stopCamera();
}

Sinch call button error?

I am trying to access a class in another class and i can getting this error. I am using sinch to implement app to app phone call in my application and it is still not working.
This is my error
FATAL EXCEPTION: main
Process: com.example.thinker.myapplication2, PID: 10039
java.lang.NullPointerException: Attempt to invoke virtual method 'com.sinch.android.rtc.calling.Call com.example.thinker.myapplication2.SinchService$SinchServiceInterface.callUser(java.lang.String)' on a null object reference
at com.example.thinker.myapplication2.tabs.Chatting$Bases.callButtonClicked(Chatting.java:128)
at com.example.thinker.myapplication2.tabs.Chatting$1.onClick(Chatting.java:83)
at android.view.View.performClick(View.java:5265)
at android.view.View$PerformClick.run(View.java:21534)
at android.os.Handler.handleCallback(Handler.java:815)
at android.os.Handler.dispatchMessage(Handler.java:104)
at android.os.Looper.loop(Looper.java:207)
at android.app.ActivityThread.main(ActivityThread.java:5683)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:679)
This is my java class.
public class Chatting extends ListActivity {
Runnable refresh, refres;
ImageView send,back,call;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.yon);
call= (ImageView)findViewById(R.id.call);
call.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View arg0) {
if (!isOnline(Chatting.this)) {
Toast.makeText(Chatting.this, "No network connection",
Toast.LENGTH_SHORT).show();
return;
}
Bases ba = new Bases();
ba.onServiceConnected();
ba.callButtonClicked();
}
});
}
public class Bases extends BaseActivity {
#Override
protected void onServiceConnected() {
Toast.makeText(this, " call ready", Toast.LENGTH_LONG).show();
}
public void callButtonClicked() {
SharedPreferences sp = PreferenceManager
.getDefaultSharedPreferences(this);
String emaill = sp.getString("friend_email", "anon");
if (emaill.isEmpty()) {
Toast.makeText(this, "Please enter a user to call", Toast.LENGTH_LONG).show();
return;
}
try {
Call call = getSinchServiceInterface().callUser("emaill");
if (call == null) {
// Service failed for some reason, show a Toast and abort
Toast.makeText(this, "Service is not started. Try stopping the service and starting it again before "
+ "placing a call.", Toast.LENGTH_LONG).show();
return;
}
String callId = call.getCallId();
Intent callScreen = new Intent(this, CallScreenActivity.class);
callScreen.putExtra(SinchService.CALL_ID, callId);
startActivity(callScreen);
} catch (MissingPermissionException e) {
ActivityCompat.requestPermissions(this, new String[]{e.getRequiredPermission()}, 0);
}
}
}
}
below is the baseactivity class that has the getSinchServiceInterface(). that is returning null
public abstract class BaseActivity extends Activity implements ServiceConnection {
private SinchService.SinchServiceInterface mSinchServiceInterface;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getApplicationContext().bindService(new Intent(this, SinchService.class), this,
BIND_AUTO_CREATE);
}
#Override
public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
if (SinchService.class.getName().equals(componentName.getClassName())) {
mSinchServiceInterface = (SinchService.SinchServiceInterface) iBinder;
onServiceConnected();
}
}
#Override
public void onServiceDisconnected(ComponentName componentName) {
if (SinchService.class.getName().equals(componentName.getClassName())) {
mSinchServiceInterface = null;
onServiceDisconnected();
}
}
protected void onServiceConnected() {
// for subclasses
}
protected void onServiceDisconnected() {
// for subclasses
}
protected SinchService.SinchServiceInterface getSinchServiceInterface() {
return mSinchServiceInterface;
}
}

Most of time this happen when someone use wrong way to pass context try to pass context as YourActivityName.this (eg Bases.this )rather than just this or getApplicationContext()
start with
#Override
protected void onServiceConnected() {
Toast.makeText(Bases.this, " call ready", Toast.LENGTH_LONG).show();
}
this is not the proper method to call activity
Bases ba = new Bases();
ba.onServiceConnected();
ba.callButtonClicked();
use
Intent intent = new Intent(YourCurrentActivityName.this,Bases.class);
startActivity(intent);
in the oncreate method you can call this methods callButtonClicked()

starting activity from a callback method

i use a class WebServiceAdapter using volley library for implementing http connections. since i can't find a way to return a string to activity
i use an interface to callnback into MainActivity. in it i want to start a new activity but it is not starting
my WebServiceAdapterClass
public WebServiceAdapter(Context context){
this.context = context;
status = "new";
rQueue = Volley.newRequestQueue(context);
}
private WebServiceInterface wsi;
public void sendGetRequest(String page,Map<String,String> map, WebServiceInterface i){
wsi = i;
String query = "";
if(!map.isEmpty()){
for (Map.Entry<String, String> entry : map.entrySet())
{
query =query + entry.getKey()+"="+entry.getValue()+'&';
}
}
if(query.length() != 0)
query = query.substring(0,query.length()-1);
StringRequest sRequest = new StringRequest(Request.Method.GET,BASE_URI+page+"?"+query,
new Response.Listener<String>() {
#Override
public void onResponse(String response){
wsi.successCallback(response,context);
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error){
wsi.errorCallback("failed",context);
}
});
rQueue.add(sRequest);
}
and in MainActivity inside callBack which use an interface for callback
#Override
public void successCallback(String s, Context c) {
Intent myintent = new Intent(c,VerifyRegister.class);
startActivity(myintent);
finish();
}
but the activity is not starting
i tried passing this , getApplicationContext() and Main Activity.this instead of c. but never worked
what i wanted was return a string on success i cant find another way
but the new activity is not starting
update
code of verifyRegister class
public class VerifyRegister extends Activity implements WebServiceInterface{
private Button verifyButton;
private EditText loginVerify;
StorageAdapter sAdapter;
#Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
sAdapter = new StorageAdapter();
if(sAdapter.getValue(this, "phone").length() == 0)
finish();
setContentView(R.layout.login_verify);
verifyButton = (Button) findViewById(R.id.verifyButton);
loginVerify = (EditText) findViewById(R.id.loginVerify);
verifyButton.setOnClickListener(new OnClickListener(){
public void onClick(View v){
}
});
}
#Override
public void successCallback(String s, Context c) {
// TODO Auto-generated method stub
}
#Override
public void errorCallback(String s, Context c) {
// TODO Auto-generated method stub
}
*update 2 *
i called the WebService Adapter like this
wAdaptor = new WebServiceAdapter(this);
wAdaptor.sendGetRequest("/register",new HashMap<String,String> (),this);

Please verify that your VerifyRegister class does in fact extends Activity. And if it does extends, please make sure that you have added it in AndroidManifest file.
One more thing you can try is, you can write it like this:
Intent myintent = new Intent(MainActivity.this,VerifyRegister.class);

Try this:
#Override
public void successCallback(String s, Context c) {
Intent myintent = new Intent(MainActivity.this,VerifyRegister.class);
c.startActivity(myintent);
//finish(); Dont use this
}

New activity starts with Context, I your case you should call it by using to activity currently running.
MainActivity.this.startActivity(anyintent);

i searched similar projects in github
and found this
public void successCallback(String s, Context c) {
Intent myintent = new Intent(MainActivity.this,VerifyRegister.class);
MainActivity.this.startActivity(myintent);
finish()
}

Handler does not stop on Destroy or on Pause of activity

I am having problem with chatting app , I am trying to run chat receiver functionality using handler such that as soon as messages are received they are taken care of and displayed on screen . But it fails when I try to go back and resume the chatting, since Handler keeps on running so is the message object associated with it , and it fails to reinitialize it. Following is the code :
public class hotListener extends ListActivity {
private HotspotService service;
private XMPPConnection connection;
private IBinder binder;
private Handler mHandler = new Handler();
private ArrayList<String> messages = new ArrayList<String>();
ArrayList<ChatMessage> messagex= new ArrayList<ChatMessage>();
ChattingAdapter adaptex= new ChattingAdapter(hotListener.this, messagex);;
HotspotService.MyBinder binderx;
Intent mIntent ;
private ListView listview;
EditText sender_message ;
String msg;
Thread t;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.listener);
setListAdapter(adaptex);
System.out.println("inside on create");
Button send_button = (Button) findViewById(R.id.chat_send_message);
sender_message = (EditText) findViewById(R.id.chat_input);
send_button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
msg = sender_message.getText().toString();
sender_message.setText("");
if(!(msg.length()==0)){
messagex.add(new ChatMessage(msg, true));
//addNewMessage(new ChatMessage(msg, true));
adaptex.notifyDataSetChanged();
getListView().setSelection(messagex.size()-1);
}
}
});
if(!isMyServiceRunning()){
System.out.println("seems like service not running");
startService(new Intent(this,HotspotService.class));
System.out.print(" now started ");
}
}
#Override
protected void onStart(){
super.onStart();
System.out.println("in onstart");
}
private void receivespots(XMPPConnection connection2, final ChattingAdapter adaptex2) {
connection2.getChatManager().addChatListener(new ChatManagerListener() {
#Override
public void chatCreated(Chat arg0, boolean arg1) {
arg0.addMessageListener(new MessageListener() {
#Override
public void processMessage(Chat chat, Message message) {
//final String from = message.getFrom();
final String body = message.getBody();
mHandler.post(new Runnable() {
#Override
public void run() {
messagex.add(new ChatMessage(body, false));
for(int i=0;i<messagex.size();i++){
ChatMessage xc = messagex.get(i);
System.out.println(xc.message);
}
adaptex.notifyDataSetChanged();
getListView().setSelection(messagex.size()-1);
Toast.makeText(hotListener.this,body,Toast.LENGTH_SHORT).show();
}
});
}
});
}
});
}
private boolean isMyServiceRunning() {
ActivityManager manager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
for(RunningServiceInfo service : manager.getRunningServices(Integer.MAX_VALUE)){
if(HotspotService.class.getName().equals(service.service.getClassName())){
return true;
}
}
return false;
}
#Override
protected void onResume() {
bindService(new Intent(this, HotspotService.class), mConnection, Context.BIND_AUTO_CREATE);
adaptex.notifyDataSetChanged();
System.out.println("inside on resume");
super.onResume();
}
#Override
protected void onDestroy(){
super.onDestroy();
System.out.println("in on destroy");
unbindService(mConnection);
mHandler.removeCallbacksAndMessages(null);
}
#Override
protected void onPause() {
System.out.println("inside on pause");
super.onPause();
}
private ServiceConnection mConnection = new ServiceConnection() {
#Override
public void onServiceDisconnected(ComponentName name) {
connection = null;
service = null;
}
#Override
public void onServiceConnected(ComponentName name, IBinder binder) {
service = ((HotspotService.MyBinder)binder).getService();
connection = service.getConnection();
receivespots(connection,adaptex);
}
};
}
Is it right way to run such methods ? Definitely not , I can also try to save messages in sqlite and reload on display but that will also fail , since messagex associated with mhandler does not reinitializes and fails to display any message received on screen after resume of activity . It does work properly for first time . But moment messagex is used in handler it keeps on appending messages to old messagex and fails to display after resume on activity