Question

在我的表单片段硬件＆＃34;返回＆＃34;按钮工作不正确。例如，当我打开片段并且当我没有开始输入时，我按下硬件＆＃34;返回＆＃34;按钮它的工作非常好。但是当我开始打字并打字后按下硬件＆＃34;返回＆＃34;按钮不起作用。

我的表单片段我正在使用OnResume（）方法来处理后退按钮进程。

@Override
public void onResume() {

    super.onResume();

    getView().setFocusableInTouchMode(true);
    getView().requestFocus();
    getView().setOnKeyListener(new View.OnKeyListener() {
        @Override
        public boolean onKey(View v, int keyCode, KeyEvent event) {

            if (event.getAction() == KeyEvent.ACTION_UP && keyCode == KeyEvent.KEYCODE_BACK){
                //getView().clearFocus();

                getActivity().getSupportFragmentManager().popBackStack();


                return true;
            }

            return false;
        }
    });
}

Answer 1

覆盖onBackPressed()

@Override
public void onBackPressed()
{
   moveTaskToBack(true);
}

Answer 2

EditText  creditcatno= (EditText)view.findviewByid(R.id.ed1);

public void onResume（）{super.onResume（）; creditcatno1.setOnKeyListener（new View.OnKeyListener（）{@Override public boolean onKey（View v，int keyCode，KeyEvent event）{if（keyCode == KeyEvent.KEYCODE_BACK）{// call previous Fragment here返回true;} return false; }}; 。getView（）setFocusableInTouchMode（真）; 。getView（）requestFocus（）方法; getView（）。setOnKeyListener（new View.OnKeyListener（）{@Override public boolean onKey（View v，int keyCode，KeyEvent event）{if（event.getAction（）== KeyEvent.ACTION_UP＆amp;＆amp; keyCode == KeyEvent。 KEYCODE_BACK）{//回退按钮的点击监听器//Toast.makeText（getActivity（），＆＃34; Back press＆＃34;，Toast.LENGTH_SHORT）.show（）; getActivity（）。getSupportFragmentManager（） .popBackStack（）; return true;} return false;}}）; }

Answer 3

制作一个静态字符串变量：

ggplot() +
  geom_bar(aes(y = Beneficiaries, x = Age, fill = type),
           data = sdi_data_2,
           stat = "identity") +
  theme_bw() +
  scale_y_continuous(label = comma) +
  scale_fill_manual(
    name = "",
    values = c(
      "Injuries" = "orange2",
      "Circulatory, Respiratory, Endocrine, and Neoplasms" =
        "sandybrown",
      "Nervous System" = "peachpuff",
      "Intellectual Disability" = "skyblue2",
      "Musculo-Skeletal" = "royalblue3",
      [enter image description here][1] "Other and Unknown" =
        "lightgoldenrod1",
      "Other Mental Health" = "royalblue1"
    ),
    breaks = c(
      "Other and Unknown",
      "Injuries",
      "Circulatory, Respiratory, Endocrine, and Neoplasms",
      "Nervous System",
      "Musculo-Skeletal",
      "Other Mental Health",
      "Intellectual Disability"
    )
  )

打开片段时，将此变量值设置为片段名称：

public static String currentFragment = "";

现在使用MainActivity.currentFragment = "your fragment name";中的onbackpress方法：

MainActivity

键入edittext后，硬件“后退”按钮不起作用

3 个答案: