Agfdhyk

I'm trying to create a small service that connects to a site does the operations and during the process updates the textview present. Nothing wrong until I enter a for loop, because the activity stops, it becomes completely white until when it does not end.

I would like to update the text step by step.

I created an async task, but it gives me the error '
failed to load window.

Below is my code, I state that I put all the permissions.

public class GameTask extends AsyncTask<String, Integer, Long> {



private ProgressBar progressBar;

private TextView text;



public GameTask(ProgressBar progressBar, TextView text) {

    this.progressBar = progressBar;

    this.text = text;

}



@Override

protected Long doInBackground(String... strings) {

    startGameThread(progressBar, text);

    return null;

}





private void startGameThread (final ProgressBar progressBar, final TextView text) {

    final Handler mHandler = new Handler();

    final Runnable mRunnable = new Runnable() {

                @Override

                public void run() {

                    try {

                        progressBar.setProgress(0);

                        text.setText("Thread Iniziato...");

                        for (int i = 0; i <= 1000; i++) {

                            if (i == 0 || i % 10 == 0) {

                                text.setText("NUMBER " + i);

                            }

                        }

                        progressBar.setProgress(100);

                    } catch (IOException e) {

                        e.printStackTrace();

                    }



                }

            };

    new Thread(mRunnable).start();

}

}

Try this method into AsyncTask

    @Override

    protected void onProgressUpdate(Integer... values) {

        super.onProgressUpdate(values);



        try {

            progressBar.setProgress(0);

            text.setText("Thread Iniziato...");

            for (int i = 0; i <= 1000; i++) {

                if (i == 0 || i % 10 == 0) {

                    text.setText("NUMBER " + i);

                }

            }

            progressBar.setProgress(100);

        } catch (IOException e) {

            e.printStackTrace();

        }

    }

You can take full advantage of AsyncTask to perform tasks in background and UI thread without a Handler:

public class GameTask extends AsyncTask<String, Integer, Long> {



    private ProgressBar progressBar;

    private TextView text;



    public GameTask(ProgressBar progressBar, TextView text) {

        this.progressBar = progressBar;

        this.text = text;

    }



    @Override

    protected void onPreExecute() {

        super.onPreExecute();

        // UI thread

        text.setText("Thread Iniziato...");

    }



    @Override

    protected Long doInBackground(String... strings) {

        // Non-UI thread

        for (int i = 0; i <= 1000; i++) {

            if (i == 0 || i % 10 == 0) {

                publishProgress(i/100, i);

            } else {

                publishProgress(i/100);

            }

            try {

                Thread.sleep(100); // Backpressure if needed for your sample

            } catch (InterruptedException e) {

                e.printStackTrace();

            }

        }

        return null;

    }



    @Override

    protected void onProgressUpdate(Integer... values) {

        super.onProgressUpdate(values);

        // UI thread

        progressBar.setProgress(values[0]);

        if (values.length > 1) {

            text.setText("NUMBER " + values[1]);

        }

    }

}

As this Process is Running Inside AsyncTask, You need to Use runOnUiThread method to update the TextView. UI can only be Upated on MainThread.

     private void startGameThread () {

//        final Handler mHandler = new Handler();



                final Runnable mRunnable = new Runnable() {

                    @Override

                    public void run() {

                        for (int i = 0; i <= 1000; i++) {

                            if (i == 0 || i % 10 == 0) {

                                final int finalI = i;

                                activity.runOnUiThread(new Runnable() {

                                    @Override

                                    public void run() {



                                        textView.setText(String.valueOf(finalI));

                                    }

                                });



                                try {

                                    Thread.sleep(2000);

                                } catch (InterruptedException e) {

                                    e.printStackTrace();

                                }

                            }

                        }



                    }

                };

                new Thread(mRunnable).start();







    }