片段中的Onbackpressed在实现接口时不起作用 [英] Onbackpressed in fragment not working while implementing interface

问题描述

我正在尝试覆盖fragment中的onbackpressed方法.但是它给了我语法错误，它应该重写接口中的super方法.为什么这样?我的片段类中也有其他方法，例如ondestroy，但没有错误.为什么要为此单独压制.我也尝试过onkeydown.同样的错误.粘贴到我的代码下面.

I am trying to override onbackpressed method inside fragment . But it gives me syntax error that it should override a super method in interface. Why so? I have other methods like ondestroy also in my fragment class but no error. Why for this backpressed alone. I tried onkeydown also. Same error. Pasting below my code.

  public TestClass extends Fragment implements    Testinterface
{  @Override //error must override or implement    supertype method
 public void onBackPressed ()
{
 if (check)
Do somethin
 else
  getActivity().finish ()
  //super.onBackPressed () // error here if I use this
  }

推荐答案

您必须在片段上实现键按下，并检查键代码.onBackPress()方法可以在Activity中使用-这是片段的逻辑父级.

You have to implement on key down in fragment, check for key code. The onBackPress() method can be used in an Activity -- which is the logical parent of your fragment.

尝试一下:

frag.getView().setFocusableInTouchMode(true);
frag.getView().setOnKeyListener( new OnKeyListener(){
    @Override
    public boolean onKey( View v, int keyCode, KeyEvent event ){
        if( keyCode == KeyEvent.KEYCODE_BACK ){
            return true;
        }
        return false;
    }
} );

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