Question

这是我的GamePlay活动代码

public class GamePlay extends Activity implements OnClickListener {

private boolean disableSound = false;
//.....
//Code Code
//.....

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

@Override
public void onSaveInstanceState(Bundle savedInstanceState) {
  super.onSaveInstanceState(savedInstanceState);
  // Save UI state changes to the savedInstanceState.
  // This bundle will be passed to onCreate if the process is
  // killed and restarted.
  savedInstanceState.putBoolean("disableSound", disableSound);
}

@Override
public void onRestoreInstanceState(Bundle savedInstanceState) {
  super.onRestoreInstanceState(savedInstanceState);
  // Restore UI state from the savedInstanceState.
  // This bundle has also been passed to onCreate.
  disableSound = savedInstanceState.getBoolean("disableSound");
  Menu menu = (Menu)findViewById(R.menu.tic_tac_toe);
  MenuItem toggleSoundItemMenu = menu.findItem(R.id.toogle_sound_menu);
  if(disableSound)
      toggleSoundItemMenu.setTitle(R.string.toggle_sound_off_label);
  else
      toggleSoundItemMenu.setTitle(R.string.toggle_sound_on_label);

}

//other functions and code
}

现在游戏重启我正在重启活动。以下代码位于onClickListener（）内，并带有适当的大小写

    case R.id.game_play_restart_button:
        Intent restartActivity = new Intent(this,GamePlay.class);
        finish();
        startActivity(restartActivity);
        break;

但是国家仍然没有坚持下去。我禁用声音并重新启动游戏，然后声音重新开启，这是默认行为。我错过了什么？任何建议都表示赞赏。

Answer 1

只要活动尚未被系统销毁，系统就会保留savedInstanceState包。当您调用完成时，您将销毁当前活动以及随附的捆绑包。这就是你无法获得布尔值的原因。

你应该考虑在意图中将此布尔值作为额外内容传递：

restartActivity.putExtra("disableSound", disableSound)

然后是你活动的onCreate：

getIntent().getBooleanExtra("disableSound", false)

请注意，最后一个参数false只是一个默认值。如果这是您想要的行为，您可以将其设置为true。

无法恢复已保存的活动实例

1 个答案: