我创建了很好的kotlin-esqe扩展函数，如果有人感兴趣的话

fun Activity.hideKeyBoard() {
    val view = this.currentFocus
    val methodManager = this.getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
    assert(view != null)
    methodManager.hideSoftInputFromWindow(view!!.windowToken, InputMethodManager.HIDE_NOT_ALWAYS)
}

fun Activity.showKeyboard() {
    val view = this.currentFocus
    val methodManager = this.getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
    assert(view != null)
    methodManager.showSoftInput(view, InputMethodManager.SHOW_IMPLICIT)
}

是的，你可以用setOnFocusChangeListener来做，它会帮助你。

editText.setOnFocusChangeListener(new View.OnFocusChangeListener() {
    @Override
    public void onFocusChange(View v, boolean hasFocus) {
        if (hasFocus) {
            dialog.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE);
        }
    }
});

我创建了很好的kotlin-esqe扩展函数，如果有人感兴趣的话

fun Activity.hideKeyBoard() {
    val view = this.currentFocus
    val methodManager = this.getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
    assert(view != null)
    methodManager.hideSoftInputFromWindow(view!!.windowToken, InputMethodManager.HIDE_NOT_ALWAYS)
}

fun Activity.showKeyboard() {
    val view = this.currentFocus
    val methodManager = this.getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
    assert(view != null)
    methodManager.showSoftInput(view, InputMethodManager.SHOW_IMPLICIT)
}

你可以在EditText上附加onFocusListener或在AlertDialog上附加onShowListener，并添加以下内容:

val methodManager = activity.getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
methodManager.showSoftInput(view, InputMethodManager.SHOW_IMPLICIT)

看看这个手动隐藏和显示IME的讨论。然而，我的感觉是，如果一个集中的EditText没有带来IME，这是因为你正在调用AlertDialog.show()在你的OnCreate()或一些其他方法，在屏幕实际呈现之前被唤起。移动到OnPostResume()应该在这种情况下修复它，我相信。

让我指出一些额外的信息，解决yuku，因为我发现很难得到这个工作!我如何从我的AlertDialog. builder获得AlertDialog对象?嗯，这是alert.show()执行的结果:

final AlertDialog.Builder alert = new AlertDialog.Builder(getActivity());
final EditText input = new EditText(getActivity());
alert.setView(input);

// do what you need, like setting positive and negative buttons...

final AlertDialog dialog = alert.show();

input.setOnFocusChangeListener(new OnFocusChangeListener() {
   @Override
   public void onFocusChange(View v, boolean hasFocus) {
      if(hasFocus) {
         dialog.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE);
      }
   }
});