Question

我正在尝试在Android上创建应用。当用户单击按钮时，按钮的背景颜色变为红色。但是，当我旋转屏幕时，背景颜色会变回原始颜色。

当用户点击按钮时，我使用button.setBackgroundResource(R.drawable.button_red)将背景更改为红色。我试图在屏幕旋转后使用onSaveInstanceState(Bundle savedInstanceState)来保持相同的背景颜色并单击按钮的状态，但我不知道如何处理它。

@Override
public void onSaveInstanceState(Bundle savedInstanceState) {
    savedInstanceState.putBoolean(ANSWER_ONE_BUTTON_ISCLICKED, true);
    super.onSaveInstanceState(savedInstanceState);
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup parent,
        Bundle savedInstanceState) {
    if (savedInstanceState != null) {
       button.setBackgroundResource(R.drawable.button_red);
       //some codes to make the button becomes clicked.
    }
}

谢谢！

Answer 1

维护boolean更改按钮的onClick并将其保存在onSaveInstanceState上

@Override
public void onSaveInstanceState(Bundle savedInstanceState) 
{
  savedInstanceState.putBoolean(ANSWER_ONE_BUTTON_ISCLICKED, isButtonOneClicked);
  super.onSaveInstanceState(savedInstanceState);
}

并在onCreateView点检查

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup parent,
    Bundle savedInstanceState) 
{
  if (savedInstanceState != null) 
  {
    if (savedInstanceState.containsKey(ANSWER_ONE_BUTTON_ISCLICKED))
    {
      if (savedInstanceState.getBoolean(ANSWER_ONE_BUTTON_ISCLICKED))
        button.setBackgroundResource(R.drawable.button_red);
      else
        button.setBackgroundResource(R.drawable.original_color);
    }
     //some codes to make the button becomes clicked.
  }
}

屏幕旋转后如何保持按钮样式并单击状态？

1 个答案: