android中在fragment A里面点击button跳转到fragment B怎么实现？

Posted 2023-04-02

android中在fragment A里面点击button跳转到fragment B怎么实现？

方法一：直接getActivity，使用activity的fragmenttransation的replace方法替换

假设

class OneFragment extends Fragment
private Button btn;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) 
View view = inflater.inflate(R.layout.frag_one, null);
btn = (Button)view.findViewById(R.id.button);
btn.setOnClickListener(new OnClickListener() 

@Override
public void onClick(View v) 
FragmentManager fm = getActivity().getFragmentManager();
fm.beginTransaction()
//替换为TwoFragment
.replace(R.layout.fragment_container,new TwoFragment())
.commit();

);
return super.onCreateView(inflater, container, savedInstanceState);

但是这样做会使OneFragment和原activity的耦合度提高,fragment设计出来就是有重用的目的，所以不好，使用方法二

方法2：定义回调函数，当button按下调用回调

class OneFragment extends Fragment
private Button btn;
private OnButtonClick onButtonClick;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) 
View view = inflater.inflate(R.layout.frag_one, null);
btn = (Button)view.findViewById(R.id.button);
btn.setOnClickListener(new OnClickListener() 

@Override
public void onClick(View v) 
if(onButtonClick!=null)
onButtonClick.onClick(btn);


);
return super.onCreateView(inflater, container, savedInstanceState);

public OnButtonClick getOnButtonClick() 
return onButtonClick;

public void setOnButtonClick(OnButtonClick onButtonClick) 
this.onButtonClick = onButtonClick;

public interface OnButtonClick
public void onClick(View view);

这样只要在acitivty中设置回调即可

public class MainActivity extends Activity 

private OneFragment oneFragment = new OneFragment();
@Override
protected void onCreate(Bundle savedInstanceState) 
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//。。。
//。。。省略代码
oneFragment.setOnButtonClick(new OnButtonClick() 

@Override
public void onClick(View view) 
//切换到TwoFragment
fm.beginTransaction()
//替换为TwoFragment
.replace(R.layout.fragment_container,new TwoFragment())
.commit();

);

参考技术A 通过onAttach(Activity activity) 这个参数，强转成当前activity,然后调用对应的方法，replace或是add fragmentB, 也可以让当前activity,实现个切换的接口，强转成接口调用切换函数。本回答被提问者采纳

Android中在fragment中实现点击按钮事件

在fragment不能直接进行点击事件，需要放到oncreatActivity中

具体方法如下：

需要注意的是import android.support.v4.app.Fragment;导入的这个包

public class SendFragment extends Fragment 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
        return inflater.inflate(R.layout.send_fragment,container,false);
    
    @Override
    public void onActivityCreated(Bundle savedInstanceState) 
        super.onActivityCreated(savedInstanceState);
       // final User user ;
        final EditText et_title = (EditText) getActivity().findViewById(R.id.et_title);
        final EditText et_salary = (EditText) getActivity().findViewById(R.id.et_salary);
        final EditText et_sex = (EditText) getActivity().findViewById(R.id.et_sex);
        final EditText et_count = (EditText) getActivity().findViewById(R.id.et_count);
        final EditText et_phone = (EditText) getActivity().findViewById(R.id.et_phone);
        final EditText et_time = (EditText) getActivity().findViewById(R.id.et_time);
        final EditText et_address = (EditText) getActivity().findViewById(R.id.et_address);
        final EditText et_description = (EditText) getActivity().findViewById(R.id.et_description);
        Button btn_send = (Button) getActivity().findViewById(R.id.btn_send);

        btn_send.setOnClickListener(new View.OnClickListener() 
            @Override
            public void onClick(View v) 
                //String username=user.getUsername().toString();
                String title = et_title.getText().toString();
                String salary = et_salary.getText().toString();
                String sex = et_sex.getText().toString();
                String count = et_count.getText().toString();
                String phone = et_phone.getText().toString();
                String time = et_time.getText().toString();
                String address = et_address.getText().toString();
                String description = et_description.getText().toString();
                JobDao jobDao = new JobDao(getActivity());
                jobDao.add(new Job(title, salary, sex, count, phone, time, address, description));
                Toast.makeText(getActivity(), "发布成功", Toast.LENGTH_LONG).show();
                Intent intent = new Intent(getActivity(),MainActivity.class);
                startActivity(intent);
            
        );
    

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作者：shasha1021 
来源：CSDN 
原文：https://blog.csdn.net/shasha1021/article/details/72717229 
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