常連

ActivityとFragmentどちらにもImage Button を使用したアプリ作成中です。
Activityに関しては問題なく画面切り替えができたのですがFragmentに同じプログラムを挿入するとエラーとして認識されます。
何度か試しましたが解決方法が分かりませんでした。

主な使用ファイル
Java-------
DayFragment
HomeFragment
ListFragment
MainActivity
MainFragment
morefragment1
Layout------
activity_main
app_bar_main
content_main
fragment_day
fragment_home
fragment_list
fragment_main
fragment_morefragment1
nav_header_main


##Activityのプログラム（追加①②の部分）

```
package com.websarver.wings.android.mamaraku;

import android.app.Activity;
import android.content.Intent;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.view.View;
import android.support.design.widget.NavigationView;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ImageButton;
import android.widget.TextView;


public class MainActivity extends AppCompatActivity
        implements NavigationView.OnNavigationItemSelectedListener {
//-------------------------
    private ImageButton Today1;
    private ImageButton Today2;
    private ImageButton Today3;
    private ImageButton Today4;
    private ImageButton Today5;
    private ImageButton Today6;
    private ImageButton Today7;
    private ImageButton Today8;
    private ImageButton Today9;

 //   ------------------//追加①

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        //-----------
        //today1
        Today1 = findViewById(R.id.today1);
        Today1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                setContentView(R.layout.activity_more1);
            }
        });

        //today2
        Today2 =  findViewById(R.id.today2);
        Today2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                setContentView(R.layout.activity_more1);
            }
        });

        //today3
        Today3 =  findViewById(R.id.today3);
        Today3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                setContentView(R.layout.activity_more1);
            }
        });

        //today4
        Today4 =  findViewById(R.id.today4);
        Today4.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                setContentView(R.layout.activity_more1);
            }
        });

        //today5
        Today5 =  findViewById(R.id.today5);
        Today5.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                setContentView(R.layout.activity_more1);
            }
        });
        //today6
        Today6 =  findViewById(R.id.today6);
        Today6.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                setContentView(R.layout.activity_more1);
            }
        });
        //today7
        Today7 =  findViewById(R.id.today7);
        Today7.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                setContentView(R.layout.activity_more1);
            }
        });
        //today8
        Today8 =  findViewById(R.id.today8);
        Today8.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                setContentView(R.layout.activity_more1);
            }
        });
        //today9
        Today9 =  findViewById(R.id.today9);
        Today9.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                setContentView(R.layout.activity_more1);
            }
        });




        //----------追加②

        DrawerLayout drawer = findViewById(R.id.drawer_layout);
        ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
                this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
        drawer.addDrawerListener(toggle);
        toggle.syncState();

        NavigationView navigationView = findViewById(R.id.nav_view);
        navigationView.setNavigationItemSelectedListener(this);
    }



    //----------------------
   // public void open(){
     //   Intent intent = new Intent(this, More1.class);
       // startActivity(intent);
   // }
    //-----------------追加③
    @Override

    //Home画面に戻らずにアプリHomeに戻すには//を消してエラーを解決
  public void onBackPressed() {
   //    DrawerLayout drawer = findViewById(R.id.drawer_layout);

  // }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    @SuppressWarnings("StatementWithEmptyBody")
    @Override
    public boolean onNavigationItemSelected(MenuItem item) {
        // Handle navigation view item clicks here.
        int id = item.getItemId();
        Fragment fragment = null;
        Activity activity = null;
        Class fragmentClass = null;
        if (id == R.id.nav_camera) {
            // Handle the camera action
            fragmentClass = HomeFragment.class;
        } else if (id == R.id.nav_gallery) {
            fragmentClass = DayFragment.class;

        } else if (id == R.id.nav_slideshow) {
            fragmentClass = ListFragment.class;

        } else if (id == R.id.nav_manage) {
            fragmentClass = MainFragment.class;

        } else if (id == R.id.nav_share) {
            fragmentClass = MainFragment.class;

        } else if (id == R.id.nav_send) {
            fragmentClass = MainFragment.class;

        }
        try {
            fragment = (Fragment) fragmentClass.newInstance();
        } catch (Exception e) {
            e.printStackTrace();
        }
        FragmentManager fragmentManager = getSupportFragmentManager();
        fragmentManager.beginTransaction().replace(R.id.flContent, fragment).commit();

        DrawerLayout drawer = findViewById(R.id.drawer_layout);
        drawer.closeDrawer(GravityCompat.START);
        return true;
    }






}

```

##Fragmentでは
次の写真のように赤文字でエラーになります。
![Fragmentでのエラー](f0e9456b0a843cafe2b9720183500f8e.png)

##補足

何か足りない情報などがありましたら教えてください。よろしくお願いします。

	@@ -1,1 +1,1 @@
1	- ImageButtonを使用した画面切り替えのプログラムがFragmentでうまくいかないことについて
1	+ ImageButtonを使用した画面切り替えのプログラムがFragmentでうまくいかないことを解決したい

質問編集履歴