以dispatchKeyEvent为例

1、创建回调接口FragmentKeyeventListener

/*** 作者：created by meixi* 邮箱：13164716840@163.com* 日期：2018/9/10 15*/
public interface FragmentKeyeventListener {boolean onFragmentKeyEvent(KeyEvent event);
}

2、fragment实现接口

public class TestFragment extends Fragment implements FragmentKeyeventListener{

TestActivity testActivity ;

@Override

public void onAttach(Activity activity) {

super.onAttach(activity); testActivity = (TestActivity)activity;

testActivity.setFragmentKeyeventListener(this); //设置监听

}

@Override

public boolean onFragmentKeyEvent(KeyEvent event) {//实现回调方法

return false;

}

}

3、activity代码，通过接口把dispatchKeyEvent事件传递到fragment

 

FragmentKeyeventListener fragmentKeyeventListener;public void setFragmentKeyeventListener(FragmentKeyeventListener fragmentKeyeventListener) {this.fragmentKeyeventListener = fragmentKeyeventListener;
}@Override
public boolean dispatchKeyEvent(KeyEvent event) {//防止该方法执行两次if(event.getKeyCode() == 66 && event.getAction() != KeyEvent.ACTION_UP) {//不响应按键抬起时的动作return false}if (fragmentKeyeventListener!=null&&event.getKeyCode()==66){fragmentKeyeventListener.onFragmentKeyEvent(event);return true;}return super.dispatchKeyEvent(event);
}