Activity switching wont keep the state of the view alive even using saveinstancestate() why?

Question

Salam

i just started working on android(beginner). Im stuck in the activity state complexity. I created two activitys(activity1 and activity2). wen i move from the activity1 to 2 and then back to activity1 using a button(back of activity)the values(states) of the views are not restored. here is the code..

ACTIVITY1

public class activity1 extends Activity implements OnClickListener {

    String txt;
    EditText etxt;
    TextView tv;

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        if (savedInstanceState != null) {
            Toast.makeText(this, "onCreate() : " , Toast.LENGTH_LONG).show();
        }

        setContentView(R.layout.main);
        Button btn_cont = (Button)findViewById(R.id.btn);
        etxt = (EditText)findViewById(R.id.etxt);
        tv = (TextView) findViewById(R.id.tv);
        btn_cont.setOnClickListener(this);
        tv = (TextView) findViewById(R.id.tv);
    }

    @Override
    public void onClick(View click) {
        txt = etxt.getText().toString();
        Intent intent = new Intent(this, Activity2.class);
        startActivity(intent);
        tv.setText(txt);
    }
    public void onSaveInstanceState(Bundle sis){
        sis.putString("ist arg", "sec arg");
        Toast.makeText(this, "ActivitySaveIns", Toast.LENGTH_LONG).show();
        super.onSaveInstanceState(sis);
    }
}

ACTIVITY2

public class Activity2 extends Activity implements OnClickListener{

    Button btn_back;
    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.act2);
        btn_back = (Button)findViewById(R.id.btn_back);
        btn_back.setOnClickListener(this);
    }

    public void onClick(View v) {
        Intent intent2 = new Intent(this,activity1.class);
        startActivity(intent2);

    }
}

Answer 1

Here is what your doing:

1. Start Activity1
2. Start Activity2
3. Start [another instance of] Activity1

So after you have pressed the 'back' button [you should just let the hardware back button do the job!], you end up with three activities.

If you want to keep a back button like that, instead of creating a new instance just call onBackButtonPressed() which will close the current Activity (and take you back to the original one).