如何在没有 EditText 的情况下从 Android 软键盘附加按键事件？

Question

我想在没有 EditText 的情况下从软键盘附加按键事件。我已经覆盖了一些方法。但是不行。

这是我打开软键盘的代码。

public class MyActivity extends Activity {

  public void OpenKeyboard() {
    InputMethodManager keyboard = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
    keyboard.toggleSoftInputFromWindow(getCurrentFocus().getWindowToken(), InputMethodManager.SHOW_FORCED, 0);
  }

  @Override
  public boolean dispatchKeyEvent(KeyEvent e) {
    if(e.getAction() == KeyEvent.ACTION_DOWN)
      Log.d("displatch", "clicked.."); // NOT-WORKING..

    return super.dispatchKeyEvent(e);
  }

  @Override
  public boolean onKeyDown(int keyCode, KeyEvent event) {
    if(event.getAction() == KeyEvent.ACTION_DOWN)
      Log.d("onKeyDown", "clicked.."); // NOT-WORKING..

    return super.onKeyDown(keyCode, event);
  }
}

请找到解决方案。谢谢

Answer 1

您必须将 onKeyListener 绑定到您的 editText。

edttext.setOnKeyListener(new OnKeyListener() {           
            @Override
            public boolean onKey(View v, int keyCode, KeyEvent event) {
                if (event.getAction()==KeyEvent.ACTION_DOWN && keyCode == KeyEvent.KEYCODE_ENTER) {
                    //do something here
                    return true;
                }
                return false;
            }
        });

或者试试这个。

edittext.setonKeyListener(this);

Answer 2

你可以实施 KeyEvent.Callback

public class SomeActivity extends AppCompatActivity implements KeyEvent.Callback
{
//...
@Override
public boolean onKeyUp(int keyCode, KeyEvent event) {
    switch (keyCode) {
        case KeyEvent.KEYCODE_D:
            moveShip(MOVE_LEFT);
            return true;
        case KeyEvent.KEYCODE_F:
            moveShip(MOVE_RIGHT);
            return true;
        case KeyEvent.KEYCODE_J:
            fireMachineGun();
            return true;
        case KeyEvent.KEYCODE_K:
            fireMissile();
            return true;
        default:
            return super.onKeyUp(keyCode, event);
    }
}
}

您可以在 Handling Keyboard Actions

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