How to change title of Activity in Android?

Question

I am using

Window w = getWindow();
w.setTitle(\"My title\");

to change title of my current Activity but it does not seem to work.

Answer 1

If you want to change Title of activity when you change activity by clicking on the Button. Declare the necessary variables in MainActivity:

    private static final String TITLE_SIGN = "title_sign";
    ImageButton mAriesButton;

Add onClickListener in onCreate() and make new intent for another activity:

    mTitleButton = (ImageButton) findViewById(R.id.title_button);
    mTitleButton.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        Intent intent = new Intent(MainActivity.this, 
        SignActivity.class);
        String title_act = getText(R.string.simple_text).toString();
        intent.putExtra("title_act", title_act);
        startActivity(intent);
        finish();
        }
    });

SecondActivity code in onCreate():

    String txtTitle = getIntent().getStringExtra("title_act");
    this.setTitle(txtTitle);