Question

I am tring to setText in another thread, that is, child thread. But for the following code, it is giving the error

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

 

 

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    img = (ImageView)findViewById(R.id.img);
    pb = (ProgressBar)findViewById(R.id.pb);
    this.tv = (TextView)findViewById(R.id.perc);
    tv.setText("30 %");
    pb.setProgress(30);
    pb.setMax(100);
}

public void set(int p)
{
    tv.setText(p + " %");
}

protected void onStart()
{
    super.onStart();
    pb.setProgress(20);

    Thread t = new Thread(new Runnable()
    {
        @Override
        public void run()
        {
            try {
                int i = pb.getProgress();
                while(i <100)
                {
                    while(pb.getProgress()<100)
                    {
                        pb.incrementProgressBy(5);
                        Thread.sleep(1000);
                    }
                i+=10;
                pb.setProgress(i);
                Thread.interrupted();
                set(i);
                }
            }
            catch (InterruptedException e)
            {
                e.printStackTrace();
            }
        }
    });
    t.start();
}

Answer 1

You need a reference to that textview and then do:

textView.post(new Runnable() {
    public void run() {
        textView.setText(yourText);
    } 
});

in Kotlin:

val textView: TextView = findViewById(R.id.textView)
textView.post(Runnable { textView.setText(yourText) })