在片段中显示图像滑块

Question

我创建了一个ImageSlider，作为一个与我的主项目分开的新活动，以查看它是否有效。好吧，猜猜看，确实如此！问题是它是基于活动的，当我尝试将其实现到我的其他包含片段的项目时，我在MainActivity中遇到了很多错误。有人可以帮帮我吗？我相信这个问题可能与我的主要项目有关，它也有一个导航抽屉和放大器。应用程序的MainActivity主页面中的一个片段。

MainActivity测试项目代码有效：

package com.example.user1.imageslidertest;

import android.support.v4.app.FragmentManager;
import android.support.v4.content.ContextCompat;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;
import android.widget.LinearLayout;

public class MainActivity extends AppCompatActivity {

    ViewPager viewPager;
    LinearLayout sliderDotspanel;
    private int dotscount;
    private ImageView[] dots;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        viewPager = (ViewPager) findViewById(R.id.ViewPager);

        sliderDotspanel = (LinearLayout) findViewById(R.id.SliderDots);

        ViewPagerAdapter viewPagerAdapter = new ViewPagerAdapter(this);

        viewPager.setAdapter(viewPagerAdapter);

        dotscount = viewPagerAdapter.getCount();
        dots = new ImageView[dotscount];

        for(int i = 0; i < dotscount; i++){

            dots[i] = new ImageView(this);
            dots[i].setImageDrawable(ContextCompat.getDrawable(getApplicationContext(), R.drawable.nonactive_dot));

            LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);

            params.setMargins(8, 0, 8, 0);

            sliderDotspanel.addView(dots[i], params);

        }

        dots[0].setImageDrawable(ContextCompat.getDrawable(getApplicationContext(), R.drawable.active_dot));

        viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

            }

            @Override
            public void onPageSelected(int position) {

                for(int i = 0; i< dotscount; i++){
                    dots[i].setImageDrawable(ContextCompat.getDrawable(getApplicationContext(), R.drawable.nonactive_dot));
                }

                dots[position].setImageDrawable(ContextCompat.getDrawable(getApplicationContext(), R.drawable.active_dot));

            }

            @Override
            public void onPageScrollStateChanged(int state) {

            }
        });
    }
}

ViewPagerAdapter代码：

package com.example.user1.imageslidertest;

import android.content.Context;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;

public class ViewPagerAdapter extends PagerAdapter {

private Context context;
private LayoutInflater layoutInflater;
private Integer [] images = {R.drawable.a45large, R.drawable.a45largeintior, R.drawable.a45largerear};

public ViewPagerAdapter(Context context) {
    this.context = context;
    }

@Override
public int getCount() {
    return images.length;
}

@Override
public boolean isViewFromObject(View view, Object object) {
    return view == object;
}

@Override
public Object instantiateItem(ViewGroup container, int position) {

    layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    View view = layoutInflater.inflate(R.layout.custom_layout, null);
    ImageView imageView = (ImageView) view.findViewById(R.id.imageView);
    imageView.setImageResource(images[position]);

    ViewPager vp = (ViewPager) container;
    vp.addView(view, 0);
    return view;

    }

@Override
public void destroyItem(ViewGroup container, int position, Object object) {

    ViewPager vp = (ViewPager) container;
    View view = (View) object;
    vp.removeView(view);

}
}

activity_main.xml代码：

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.user1.imageslidertest.MainActivity">

<android.support.v4.view.ViewPager
    android:id="@+id/ViewPager"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
</android.support.v4.view.ViewPager>

<LinearLayout
    android:id="@+id/SliderDots"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_below="@+id/ViewPager"
    android:gravity="center_vertical|center_horizontal"
    android:orientation="horizontal"
    android:paddingTop="300dp">
</LinearLayout>

</android.support.constraint.ConstraintLayout>

custom_layout.xml代码：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="match_parent"
        android:layout_height="292dp"
        app:srcCompat="@drawable/a45large" />
</LinearLayout>

我的MainActivity来自我的主项目，带有片段和导航抽屉（当我将测试MainActivity代码放入时，问题就出现了）：

package com.example.user1.mainproject;

import android.content.Intent;
import android.graphics.Typeface;
import android.os.Bundle;
import android.support.design.widget.NavigationView;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.Fragment;
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.view.View;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity
            implements NavigationView.OnNavigationItemSelectedListener {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        DrawerLayout drawer = (DrawerLayout) 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 = (NavigationView) findViewById(R.id.nav_view);
        navigationView.setNavigationItemSelectedListener(this);
//      Code to display Home Fragment on App Launch Page
        HomeFragment homeFragment = new HomeFragment();
        FragmentManager manager = getSupportFragmentManager();
        manager.beginTransaction().replace(
                R.id.relativelayout_for_fragment,
                homeFragment,
                homeFragment.getTag()
        ).commit();
    }

这是我在项目中面临的最大问题，所以真的会提供一些帮助，谢谢！