Question

I need to show one SecondActivity only once and only on first launch of the application. I implemented it like this (see below), but I don’t really like a solution because I need to inflate layout on onResume() because if I do not I have an empty Activity when I click back hardware button being on SecondActivity.

public class TestActivity extends Activity {
    public static final String PREFS_NAME = "MyPrefsFile";
    public static final String FIRST_RUN = "FirstRun";

    SharedPreferences sharedPreferences;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        sharedPreferences = getSharedPreferences(PREFS_NAME, 0);

        if (sharedPreferences.getBoolean(FIRST_RUN, false)) {
            setContentView(R.layout.main);
        } else {
            Intent i = new Intent(this, Second.class);
            startActivity(i);
        }
    }


    @Override
    protected void onResume() {
        super.onResume();
        setContentView(R.layout.main);
    }
}

In Second Activity I just put flag FirstRun to true.

Answer 1

In the first Activity call finish() after you make the call to startActivity(i)

Like this…

if (sharedPreferences.getBoolean(FIRST_RUN, false)) {
    setContentView(R.layout.main);
} else {
    Intent i = new Intent(this, Second.class);
    startActivity(i);
    finish();
}

You can then remove setContentView(...) from onResume().