Android - Viewrootimpl$Calledfromwrongthreadexception

Android - ViewRootImpl$CalledFromWrongThreadException

Put this in onCreate()

ImageView imageView;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.order);
        imageView = (ImageView)findViewById(R.id.imgView);
        new DownloadFilesTask().execute();       
    } 

And your AsyncTask class should be like this,

        private class DownloadFilesTask extends AsyncTask<Void, Void, Void> {
             Drawable drawable;

             @Override
             protected Void doInBackground(Void... params) {
             drawable = createDrawableFromURL(
                                   "http://savagelook.com/misc/sl_drop2.png");
              return null;
             }
             protected void onPostExecute(Void result) {
                    imageView.setImageDrawable(drawable);
            }          
        } 

how can i Fix this CalledFromWrongThreadException?

textView.setText(data); causes this problem because you are trying to set the text of UI element in a non ui thread. You should change the code and do it in ui thread by calling RunOnUiThread:

  runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        textView.setText(data);
                         Toast.makeText(MainActivity.this, data, Toast.LENGTH_SHORT).show();
                    }
                });

This will allways happen if you try to manipulate any UI element (not only a textView) inside a non ui thread (like your Runnable). As an alternative to your Runnable you can also try AsyncTask to do your actions and manipulate the UI element in onPostExecute().

 new AsyncTask<Void,Void,Void>(){

             String data="";
                    @Override
                    protected Void doInBackground(Void... params) {

                        URL dataPath = new URL("http://abdallahmurad.hostkda.com/myfirst_echo_test.php");
                    HttpURLConnection myFirstConnection = (HttpURLConnection) dataPath.openConnection();
                    InputStreamReader inputStreamReader = new InputStreamReader(myFirstConnection.getInputStream());
                    BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
                    data = bufferedReader.readLine();

                        return null;
                    }

                    @Override
                    protected void onPreExecute() {
                        super.onPreExecute();
                    }

                    @Override
                    protected void onPostExecute(Void aVoid) {
                        super.onPostExecute(aVoid);
                          textView.setText(data);
                          Toast.makeText(MainActivity.this, data, Toast.LENGTH_SHORT).show();
                    }
                }.execute();

keep in mind that also the toast has to be called in OnPostExecute.

Getting ViewRootImpl$CalledFromWrongThreadException when calling invalidate function in Custom Surface View

Only the original thread that created a view hierarchy can touch its views.

You need to use RunOnUiThread from within your thread code whenever you update your views:

RunOnUiThread (() => {
    someView.SomeProperty = "SO";
});

re: https://developer.android.com/reference/android/app/Activity.html#runOnUiThread(java.lang.Runnable)

android.view.ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views

Toast must be in UI thread .

 Toast.makeText(getApplicationContext(), "Start Talking....",Toast.LENGTH_LONG).show();

android - Caused by: android.view.ViewRootImpl$CalledFromWrongThreadException

Bad practice of use of AsyncTask,

You are trying to update your Main UI Thread from doInBackGround() as AsyncTask never allowed that.

Never update your UI from doInBackGround() of AsyncTask as its only worker thread. So write your Main UI updatation code in onPostExecute() method of AsyncTask..

@Override
        protected Void doInBackground(Void... params) {             
            try {
                URL myFileUrl = new URL("http://sposter.smartag.my/images/chicken_soup.jpg");
                HttpURLConnection conn= (HttpURLConnection)myFileUrl.openConnection();
                conn.setDoInput(true);
                conn.connect();
                InputStream is = conn.getInputStream();
                downloadBitmap = BitmapFactory.decodeStream(is);
                            } catch (FileNotFoundException e) {             
                e.printStackTrace();
            }
            catch (IOException e) {         
                e.printStackTrace();
            }               
            return null;
        }

@Override
onPostExecute()
{
 ImageView image = (ImageView) findViewById(R.id.imview);            
            image.setImageBitmap(downloadBitmap);
}

Timer causing ViewRootImpl$CalledFromWrongThreadException?

The TimerTask is executed on a worker thread (non-UI thread). Your UI (sinceView) has to be accessed from the main (UI) thread. There is a helper method in an Activity to do this: runOnUiThread.

MainActivity.this.runOnUiThread(new Runnable() {
   sinceView.setText(Helpers.toDuration(longLast));
});

android.view.ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views. (RxJava)

You should be using observeOn(AndroidSchedulers.mainThread()) not subscribeOn(AndroidSchedulers.mainThread()) . Use as

.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())

subscribeOn used to specify the Scheduler on which an Observable will operate. In your case it will be an IO scheduler.

ObserveOn is used specify the Scheduler on which an observer will observe this Observable i.e the completion in this case it will be Main thread

How to fix android.view.ViewRootImpl$CalledFromWrongThreadException

You are updating Views in a different thread

removeContent();
initView();

Call this two methods in a UI thread like.

    runOnUiThread(new Runnable() {

        @Override
        public void run() {
            removeContent();
            initView();             
        }
    });

android.view.ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.

To keep it simple, I would do this:

btnBuscarProduto.setOnClickListener(new View.OnClickListener() {  
    public void onClick(View v) {
        new Thread(new Runnable() {
            public void run() {
                Looper.prepare();
                /*This is a string*/resultadoBusca = buscar(edtBuscaProduto.getText().toString());
                System.out.println("Resultado da Busca: "+resultadoBusca);
               MyActivity.this.runOnUiThread(new Runnable(){

                    @Override
                    public void run() {
                        if(resultadoBusca.equalsIgnoreCase("Vazio")){
                            Toast toast = Toast.makeText(getActivity(), "Nada Encontrado", Toast.LENGTH_SHORT);
                            toast.show(); 
                         }else{
                           /*This is a List<String>*/listaBusca = makeList(resultadoBusca);
                           System.out.println("Lista da Busca"+listaBusca);
                           ArrayAdapter<String> spinnerArrayAdapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_spinner_dropdown_item, list);
                           spinnerArrayAdapter.setDropDownViewResource(android.R.layout.simple_spinner_item);
                           spnProdutos.setAdapter(spinnerArrayAdapter);

                        }               
                    }});

            }
          }).start();                 
    }
});

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