Execute function after 5 seconds in Android

Question

I am new in android development and now my launcher activity show only 5 seconds and after that I want to check the user is logged in or not function and perform the actions.

here is my code.

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    exactPreferences = getSharedPreferences("ExactPreference",MODE_PRIVATE);
    setContentView(R.layout.activity_landing_page);

    session = exactPreferences.getString(Model.getSingleton().SHARED_SESSION_ID,null);
    Log.i("Session Id",session);
        displayData(); // I want to perform this function after 5 seconds.
}


private void displayData() {
    if(session.equals("")){
        Intent loginIntent = new Intent(LandingPage.this,
                LoginActivity.class);
        startActivity(loginIntent);
        Log.i("User Logged In", "False");
    }
    else
    {
        Intent objIntent = new Intent(LandingPage.this,
                IndexPageActivity.class);
        startActivity(objIntent);
        Log.i("User Logged In", "True");
    }

}

Answer 1

long delay = 1000;
long period = 50000;
Timer task = new Timer();
task.scheduleAtFixedRate(new TimerTask() {
    @Override
    public void run() {
        getDriver(sessionManager.getKEY(), ride_id);
    }
}, delay, period);

Answer 2

The best option to achieve this is using a Handler:

 int TIME = 5000; //5000 ms (5 Seconds)

        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {

               function(); //call function!

            }
        }, TIME);

Answer 3

Use a CountDownTimer

// There's a TextView txtCount in Main Activity

final int secs = 5;
new CountDownTimer((secs +1) * 1000, 1000) // Wait 5 secs, tick every 1 sec
{
    @Override
    public final void onTick(final long millisUntilFinished)
    {
        txtCount.setText("" + (int) (millisUntilFinished * .001f));
    }
    @Override
    public final void onFinish()
    {
        txtCount.setText("GO!");
        finish();
        // Time's up - Start the Login Activity
        final Intent tnt =
            new Intent(getApplicationContext(), LoginActivity.class);
        startActivity(tnt);
    }
}.start();

Answer 4

Assign millisDelayTime variable with the milliseconds you desire to cause a delay. mActivity is an object of Activity for providing Application Context. In your case millisDelayTime should be initialized with 5000

mActivity.runOnUiThread(new Runnable() {
@Override
    public void run() {
    final Handler handler = new Handler();
    handler.postDelayed(new Runnable() {
       @Override
       public void run() {
             //your code here
       }
    }, millisDelayTime);
  }
});

Answer 5

When possible, try to avoid using postDelayed. It is a bad practice, since it can lose the reference to the objects that you want to draw on your screen and cause a NPE. Use a Handler instead. First of all, create a global variable Handler in which you will have to "handle" the logic for your code. Do so by using the function handleMessage.

Handler  handler = new Handler(){
    @Override
    public void handleMessage(Message msg) {
        if(msg.what == 1){
            // your code here
        }
    }
};       

Then, wherever you want to execute it, just call the function:

// 1 is the ID of your process
handler.sendEmptyMessageDelayed(1, 5000);

Please remember that in the onDestroyView method (in a Fragment) or the onDestroy (in an Activity) you will have to call

    handler.removeMessages(1)

Answer 6

You can use the Handler to add some delay.Call the method displayData() as below so that it will be executed after 5 seconds.

new Handler().postDelayed(new Runnable() {
        @Override
        public void run() {
          displayData();
        }
    }, 5000);

Note : Do not use the threads like Thread.sleep(5000); because it will block your UI and and makes it irresponsive.