Question

So, I am currently trying to edit the Snake game that android’s api provides. I am trying to make it so that after pressing menu->settings->resume, it would resume the game. However, instead of going all the way to resume, after I press settings, it quits and resumes from there. I am using Intents to resume the program.

public boolean onOptionsSelected(MenuItem menu){
    switch(menu.getItemId()){
        case R.id.settings:
        Intent prefActivity = new Intent(this,MyPreferences.class);
        startActivityForResult(prefActivity, KEY_RESUME_RESULT);
        return true;
}

public void onActivityResult(int requestCode, int resultCode, Intent data){
    switch(requestCode){
    case KEY_RESUME_RESULT:
        if(resultCode==RESULT_OK){
            if(mSnakeView.getMode() == SnakeView.PAUSE)
                this.mSnakeView.setMode(SnakeView.RUNNING);
        }
    }
}

This is in MyPreferences.class

public void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        addPreferencesFromResource(R.xml.snake_preferences);
        resume = (Preference)findPreference(getString(R.string.key_resume));
        onPreferenceTreeClick(this.getPreferenceScreen(),resume);
    }

@Override
public boolean onPreferenceTreeClick(PreferenceScreen preferencescreen,Preference preference){
        super.onPreferenceTreeClick(preferencescreen,preference);
        Intent intent = new Intent();
        if(preference == resume){
            setResult(Activity.RESULT_OK,intent);
            finish();
        }
        return true;
    }

Answer 1

You’re explicity calling the method that resumes the game inside onCreate(), which is probably why the game is resuming as soon as you launch settings. I’d suggest not using the method and instead setting up a click listener for your preference:

public void onCreate(Bundle savedInstanceState){
  super.onCreate(savedInstanceState);
  addPreferencesFromResource(R.xml.snake_preferences);
  resume = (Preference)findPreference(getString(R.string.key_resume));
  resume.setOnPreferenceClickListener (new Preference.OnPreferenceClickListener()
                                         {
    @Override
    public void onPreferenceClick(Preference preference)
    {
      setResult(Activity.RESULT_OK,intent);
      finish();
    }
  });
}

Also, based on your code onOptionsSelected() doesn’t explicitly pause the game (however the UI should be paused considering that onPause() will be called), you might want to look into that.