CalledFromWrongThreadException

Question

 public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    final ThraedDemo objDemo = new Thra         


        

Answer 1

I edited your 2nd function code, I see your code is loop forever cause the firstMethod call secondMethod and the secondMethod call the new firstMethod to start and then loop forever. I removed it and moved the code update ImageView into the UI Thread, could you try this:

class ThraedDemo {

    private void firstMethod() {
        Thread objThread = new Thread() {
            @Override
            public void run() {
                try {
                    runOnUiThread(new Runnable() {
                        public void run(){ 
                            ((ImageView)findViewById(R.id.ImageViewnumber)).setImageResource(nums[n]);  
                        }
                    });
                    Thread.sleep(10000);
                    Log.v("Thread","1111111111111111sleep");
                } catch (InterruptedException ex) {
                    System.out.println("interuped exception" + ex.getMessage());
                }
                secondMethod();
            }
        };
        objThread.start();
    }

    private void secondMethod() {
        Thread objThread2 = new Thread() {

            @Override
            public void run() {
                try {
                    runOnUiThread(new Runnable() {
                        public void run(){ 
                            ((ImageView)findViewById(R.id.ImageViewnumber)).setImageResource(nums[n+1]);  
                        }
                    });
                    n++;
                    Thread.sleep(10000);
                    Log.v("Thread","22222222222 sleep");
                } catch (InterruptedException ex) {
                    System.out.println("interuped exception" + ex.getMessage());
                }
            }
        };
        objThread2.start();
    }
}