如何从Android中的片段单击按钮打开片段

Posted 2023-04-19

【中文标题】如何从Android中的片段单击按钮打开片段

【英文标题】：How to open a Fragment on button click from a fragment in Android

【发布时间】：2015-12-18 11:36:20

【问题描述】：

我的 HomeFragment 上有一些按钮，我想在从片段单击按钮时打开片段。类似导航的东西。我正在尝试使用以下代码，但没有奏效。请帮忙 ！我对 android 很陌生，正在尝试学习新事物。

这是我的代码

import android.app.Fragment;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;

public class HomeFragment extends Fragment 

    public HomeFragment()



    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) 

        View rootView = inflater.inflate(R.layout.fragment_home, container, false);

        Button aboutBtn = (Button) rootView.findViewById(R.id.aboutusButton);
        Button phonebookBtn = (Button) rootView.findViewById(R.id.phbookButton);
        Button schemeBtn = (Button) rootView.findViewById(R.id.schemeButton);
        Button loanBtn = (Button) rootView.findViewById(R.id.loanButton);
        Button serviceBtn = (Button) rootView.findViewById(R.id.serviceButton);
        Button devBtn = (Button) rootView.findViewById(R.id.devButton);

        aboutBtn.setOnClickListener(new View.OnClickListener() 
            public void onClick(View v)
            
                // Launching new Activity on selecting single List Item
                Intent i = new Intent(getActivity(), AboutFragment.class);
                startActivity(i);
            
        );

        phonebookBtn.setOnClickListener(new View.OnClickListener() 
            public void onClick(View v)
            
                // Launching new Activity on selecting single List Item
                Intent j = new Intent(getActivity(), PhoneBookFragment.class);
                startActivity(j);
            
        );

        schemeBtn.setOnClickListener(new View.OnClickListener() 
            public void onClick(View v)
            
                // Launching new Activity on selecting single List Item
                Intent k = new Intent(getActivity(), HomeFragment.class);
                startActivity(k);
            
        );

        loanBtn.setOnClickListener(new View.OnClickListener() 
            public void onClick(View v)
            
                // Launching new Activity on selecting single List Item
                Intent l = new Intent(getActivity(), RemittanceFragment.class);
                startActivity(l);
            
        );

        serviceBtn.setOnClickListener(new View.OnClickListener() 
            public void onClick(View v)
            
                // Launching new Activity on selecting single List Item
                Intent m = new Intent(getActivity(), ServiceFragment.class);
                startActivity(m);
            
        );

        devBtn.setOnClickListener(new View.OnClickListener() 
            public void onClick(View v)
            
                // Launching new Activity on selecting single List Item
                Intent n = new Intent(getActivity(), AboutDeveloper.class);
                startActivity(n);
            
        );


        return rootView;
    

我正在寻找类似波纹管代码的东西，但不知道如何使代码与我的代码一起使用。

Button aboutBtn = (Button) v.findViewById(R.id.aboutButton);
aboutBtn.setOnClickListener(this);

Button homeBtn = (Button) v.findViewById(R.id.homeButton);
homeButton.setOnClickListener(this);

Button serviceBtn = (Button) v.findViewById(R.id.serviceButton);
serviceBtn.setOnClickListener(this);

@Override
public void onClick(View view) 
    Fragment fragment = null;
    switch (view.getId()) 
        case aboutButton:
            fragment = new AboutFragment();
            break;

        case homeBtn:
            fragment = new PhonebookFragment();
            break;

        case serviceBtn:
            fragment = new ServiceFragment();
            break;

        default:
            fragment = new HomeFragment();
            break;

    

【参考方案1】：

您可以在单击按钮时使用 FragmentTransaction 替换片段。像这样的：

  Fragment someFragment = new SomeFragment(); 
    FragmentTransaction transaction = getFragmentManager().beginTransaction();
    transaction.replace(R.id.fragment_container, someFragment ); // give your fragment container id in first parameter
    transaction.addToBackStack(null);  // if written, this transaction will be added to backstack
    transaction.commit(); 

了解performing fragment transactions here.

代码：

  package com.rupomkhondaker.sonalibank;

import android.app.Fragment;
import android.app.FragmentTransaction;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;

public class HomeFragment extends Fragment implements View.OnClickListener 

    public HomeFragment() 
    

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) 

        View rootView = inflater.inflate(R.layout.fragment_home, container, false);

        Button aboutBtn = (Button) rootView.findViewById(R.id.aboutusButton);
        Button phonebookBtn = (Button) rootView.findViewById(R.id.phbookButton);

        aboutBtn.setOnClickListener(this);
        phonebookBtn.setOnClickListener(this);


        return rootView;
    

    @Override
    public void onClick(View view) 
        Fragment fragment = null;
        switch (view.getId()) 
            case R.id.aboutusButton:
                fragment = new AboutFragment();
                replaceFragment(fragment);
                break;

            case R.id.phbookButton:
                fragment = new PhoneBookFragment();
                replaceFragment(fragment);
                break;
        
    

    public void replaceFragment(Fragment someFragment) 
        FragmentTransaction transaction = getFragmentManager().beginTransaction();
        transaction.replace(R.id.frame_container, someFragment);
        transaction.addToBackStack(null);
        transaction.commit();
    

【讨论】：

你能在我的代码中给我一个示例实现吗？

@Firefog 请看。

@Firefog “不工作”是什么意思？它是抛出错误还是其他什么？请详细写。

fragment_container ？显示红线也每个案例显示红线

@Firefog 您需要将片段容器 ID 放在那里，正如我在评论中所写的那样。如果你不知道它在哪里，那就把你的活动的 xml 放在有问题的地方。

【参考方案2】：

我有一个简单的技巧！这是 MainActivity 中的代码：

Intent intent=new Intent(getApplicationContext(),Main2Activity.class);
        intent.putExtra("pos",1);
        startActivity(intent);

Intent intent1=new Intent(getApplicationContext(),Main2Activity.class);
        intent1.putExtra("pos",2);
        startActivity(intent1);

在 Main2Activity 中，它是一个带有片段的 NavigationDrawer

Bundle extras;
  extras=getIntent().getExtras();
        if(extras!=null)
        
            position=extras.getInt("pos");
            if(position==1)
            
                fragment=new FragmentOne();

                if(fragment !=null)
                
                    android.support.v4.app.FragmentManager fragmentManager=getSupportFragmentManager();
                    FragmentTransaction fragmentTransaction=fragmentManager.beginTransaction();
                    fragmentTransaction.replace(R.id.screen_area,fragment);
                    fragmentTransaction.commit();
                
            
            if(position==2)
            
                fragment=new FragmentTwo();

                if(fragment !=null)
                
                    android.support.v4.app.FragmentManager fragmentManager=getSupportFragmentManager();
                    FragmentTransaction fragmentTransaction=fragmentManager.beginTransaction();
                    fragmentTransaction.replace(R.id.screen_area,fragment);
                    fragmentTransaction.commit();
                
            
        

【参考方案3】：

Kotlin 示例：

fun FragmentActivity.replaceFragment(fragment: Fragment, frameId: Int = R.id.fragment_container, addToStack: Boolean) 
val doesFragmentAlreadyExists = supportFragmentManager.findFragmentByTag(fragment.javaClass.simpleName) != null
if (!doesFragmentAlreadyExists) 
    supportFragmentManager.inTransaction 
        if (addToStack) replace(frameId, fragment, fragment.javaClass.simpleName)
            .addToBackStack(fragment.javaClass.simpleName)
        else
            replace(frameId, fragment, fragment.javaClass.simpleName)