Android Studio -Fragment

喵呜~今天来写片段了~

点击App->New-.>Fragment->Fragment(blank)~就会出现啦（Include的两个东西不需要喔，factory methods和Interface feedbacks）

然后呢，就会有新建了Fragment.java和.xml的两个文件，到Fragmen.xml随便写点什么，background,Button,Textview，然后到activity_main.xml,新建个Button，给它个@id/bn

然后到MainActivity.java

これを打ち込むでよいだ

package com.example.fragment;

import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {

    boolean status=false;
    Button bn;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        bn=(Button)findViewById(R.id.bn);
        bn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                android.app.FragmentManager fragmentManager=getFragmentManager();
                android.app.FragmentTransaction fragmentTransaction=fragmentManager.beginTransaction();


                if(!status)
                {
                    FragmentOne f1=new FragmentOne();
                    fragmentTransaction.add(R.id.fragment_container,f1);
                    fragmentTransaction.commit();
                    bn.setText("LOAD SECOND FRAGMENT");
                    status=true;
                }
                else
                    {
                        FragmentTwo f2=new FragmentTwo();
                        fragmentTransaction.add(R.id.fragment_container,f2);
                        fragmentTransaction.commit();
                        bn.setText("LOAD FIRST FRAGMENT");
                        status=false;

                    }
            }
        });
    }
}