package com.example.chaoba.study;

import android.app.FragmentManager;

import android.app.FragmentTransaction;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

private Dongtai dongtai;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        Button butn1=findViewById(R.id.butn1);

        butn1.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View view) {

                FragmentManager fragmentManager = getFragmentManager(); //加载一个Fragment需要先创建管理器，

                FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();  //获取FragmentTransaction对象

                if (dongtai==null){

                    dongtai=new Dongtai();

                }

                fragmentTransaction.replace(R.id.content,dongtai);  //移除所有，然后添加    或者    add方法

                fragmentTransaction.commit();//提交

            }

        });

    }

}

package com.example.chaoba.study;

import android.app.Fragment;

import android.os.Bundle;

import android.support.annotation.Nullable;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.TextView;

/**

 * Created by chaoba on 18-5-31.

 */

public class Dongtai extends Fragment implements View.OnClickListener{

       TextView tv;

    View view;

    @Nullable

    @Override

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

         view=inflater.inflate(R.layout.dongtai,container,false);  //创建view

        return view;

    }

    @Override

    public void onActivityCreated(@Nullable Bundle savedInstanceState) {

        super.onActivityCreated(savedInstanceState);
//重写本方法，用于编写业务逻辑。

        initView();

        tv.setText("11111111111111");

        tv.setOnClickListener(this);  //测试点击事件，效果  11111变成5555

    }

    public void initView(){

         tv = view.findViewById(R.id.textView2);

    }

    public void test(){

        tv.setText("5555555");

    }

    @Override

    public void onClick(View view) {

        switch (view.getId()){

            case R.id.textView2:test();break;

        }

    }

}