AndroidStudio中简单使用Fragment

Posted 2022-12-03 LazyChun

在新建的androidStudio工程中新建一个Fragment组件：

确认无误后点击“finish”：

然后AS会自动为你生成一个布局文件和一个相关类：

注意，如果你在新建Fragment时勾选了“Include interface callback”(即上图中用红色直线标记的部分)选项，则在为你生成的类中会多出一个回掉接口“OnFragmentInteractionListener”：

/**
     * This interface must be implemented by activities that contain this
     * fragment to allow an interaction in this fragment to be communicated
     * to the activity and potentially other fragments contained in that
     * activity.
     * <p>
     * See the Android Training lesson <a href=
     * "http://developer.android.com/training/basics/fragments/communicating.html"
     * >Communicating with Other Fragments</a> for more information.
     */
    public interface OnFragmentInteractionListener 
        // TODO: Update argument type and name
        void onFragmentInteraction(Uri uri);
    

如它注释所说，你必须在你使用这个Fragment的Activities中实现它：

package com.example.lenovo.lfragment;

import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

import layout.BlankFragment;

public class MainActivity extends AppCompatActivity implements BlankFragment.OnFragmentInteractionListener   //继承接口OnFragmentInteractionListener

    @Override
    protected void onCreate(Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        getSupportFragmentManager().beginTransaction().add(R.id.container,new BlankFragment()).commit();//R.id.container 为启动该Fragment的Activity的id
    
    public void onFragmentInteraction(Uri uri)   //实现OnFragmentInteractionListener接口中的函数

    

这样你就可以成功启动Fragment了;