android软键盘：onReceiveResult 触发，RESULT_SHOWN 紧随其后的是 RESULT_HIDDEN

Question

我想检测软键盘何时显示和隐藏。为此，我喜欢这样：

public class ALEditText extends EditText {
  private ALSoftInputListener mSoftInputListener;

  private static class SoftInputReceiver extends ResultReceiver {
    private static final int RESULT_UNCHANGED_HIDDEN = 1;
    private static final int RESULT_SHOWN = 2;
    private static final int RESULT_HIDDEN = 3;
    private static final int RESULT_UNCHANGED_SHOWN = 0;
    private ALSoftInputListener mListener;

    public SoftInputReceiver(ALSoftInputListener listener) {
      super(null);
      this.mListener = listener;
    }

    public void onReceiveResult(int result, Bundle data) {
      switch (result) {
        case RESULT_UNCHANGED_SHOWN /*0*/:
        case RESULT_SHOWN /*2*/:
          if (this.mListener != null) {
            this.mListener.onSoftInputShown();
          }
        case RESULT_UNCHANGED_HIDDEN /*1*/:
        case RESULT_HIDDEN /*3*/:
          if (this.mListener != null) {
            this.mListener.onSoftInputHidden();
          }
        default:
      }
    }
  }

  public void showSoftInput() {
    SoftInputReceiver receiver = new SoftInputReceiver(this.mSoftInputListener);
    InputMethodManager imm = getInputMethodManager();
    imm.showSoftInput(this, 0, receiver);
  }

  public void HideSoftInput() {
    SoftInputReceiver receiver = new SoftInputReceiver(this.mSoftInputListener);
    InputMethodManager imm = getInputMethodManager();
    imm.hideSoftInputFromWindow(getWindowToken(), 0, receiver);
  }

  public void SetSoftInputListener(ALSoftInputListener listener) {
    this.mSoftInputListener = listener;
  }

  protected InputMethodManager getInputMethodManager() {
    return (InputMethodManager) getContext().getSystemService("input_method");
  }

}

但我有一个奇怪的行为，我无法理解，当我执行 showSoftInput 时，虚拟键盘会显示，并且 onSoftInputShown 事件也会引发，但紧随其后的是 onSoftInputHidden，键盘仍然可见！稍后如果我隐藏键盘事件 onSoftInputHidden 将不会再次调用...有人可以解释我发生了什么吗？

Answer 1

我发现了问题——因为我忘记了箱子的破损。