android - 如何覆盖键盘 ondown 按钮？

Question

当用户关闭键盘上的向下按钮时，我想隐藏我的编辑文本..

尝试-1

我试过 KeycodeBack 但这不起作用

 @Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_BACK) {


        MainActivity.editText2.setVisibility(View.INVISIBLE) ;

        return true;
    }

    return super.onKeyDown(keyCode, event);
}

尝试-2

我试过 editorActionListener 但也没有帮助

editText2.setOnEditorActionListener(new TextView.OnEditorActionListener() {
           @Override
           public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
               boolean handled = false;

               if (actionId == EditorInfo.IME_ACTION_DONE ||event.getKeyCode() == KeyEvent.KEYCODE_BACK||event.getAction()==KeyEvent.KEYCODE_ENTER
                       ) {
MainActivity.editText2.setVisibility(VISIBLE);

               } 
               return handled ;
           }
       });

但是 Event 总是 null。

Answer 1

在你的 Activity 中你可以捕捉到这个事件

@Override
public void onConfigurationChanged(Configuration newConfig) {
    super.onConfigurationChanged(newConfig);


    // Checks whether a hardware keyboard is available
    if (newConfig.hardKeyboardHidden == Configuration.HARDKEYBOARDHIDDEN_NO) {
        Toast.makeText(this, "keyboard visible", Toast.LENGTH_SHORT).show();
    } else if (newConfig.hardKeyboardHidden == Configuration.HARDKEYBOARDHIDDEN_YES) {
        Toast.makeText(this, "keyboard hidden", Toast.LENGTH_SHORT).show();
    }
}

并且在您的 list 中，您应该在配置更改中添加这些更改。

    <activity
        android:configChanges = "keyboard|keyboardHidden" // and if you have any other config changes.