Java 尝试在用户滑动时显示不同的图像-Android开发

我对安卓系统的开发还比较陌生，希望能在这里得到一些帮助。我在一页中添加了两个片段。顶部的片段是一个ImageView，底部是随机按钮和文本。当用户在屏幕上向左或向右滑动时，我试图在顶部片段（ImageView）中显示不同的图像。我的代码基于另一个：。然而，当我尝试运行它时，我一直收到下面的错误。我在错误下方粘贴了我认为相关的代码。请让我知道，如果我需要张贴额外的代码！多谢各位

12-01 21:48:08.686 3996-3996/com.newmoney.night_life_now E/AndroidRuntime:FATAL EXCEPTION:main 12-01 21:48:08.686 3996-3996/com.newmoney.night_life_now E/AndroidRuntime:Process:com.newmoney.night_life_now，PID:3996 12-01 21:48:08.686 3996-3996/com.newmoney.night_life_now E/AndroidRuntime:java.lang.RuntimeException:无法启动活动组件信息{com.newmoney.night_life_now/com.newmoney.night_life_now.main活动}:android.view.InflateException:二进制XML文件行#21:膨胀类片段时出错 12-01 21:48:08.686 3996-3996/com.newmoney.night_life_now E/AndroidRuntime:android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2693） 12-01 21:48:08.686 3996-3996/com.newmoney.night_life_now E/AndroidRuntime:android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:2758） 12-01 21:48:08.686 3996-3996/com.newmoney.night_life_now E/AndroidRuntime:android.app.ActivityThread.access$900（ActivityThread.java:177） 12-01 21:48:08.686 3996-3996/com.newmoney.night_life_now E/AndroidRuntime:android.app.ActivityThread$H.handleMessage（ActivityThread.java:1448） 12-01 21:48:08.686 3996-3996/com.newmoney.night_life_now E/AndroidRuntime:at android.os.Handler.dispatchMessage（Handler.java:102） 12-01 21:48:08.686 3996-3996/com.newmoney.night_life_now E/AndroidRuntime:at android.os.Looper.loop（Looper.java:145） 12-01 21:48:08.686 3996-3996/com.newmoney.night_life_now E/AndroidRuntime:android.app.ActivityThread.main（ActivityThread.java:5942） 12-01 21:48:08.686 3996-3996/com.newmoney.night_life_now E/AndroidRuntime:at java.lang.reflect.Method.invoke（本机方法） 12-01 21:48:08.686 3996-3996/com.newmoney.night_life_now E/AndroidRuntime:at java.lang.reflect.Method.invoke（Method.java:372） 12-01 21:48:08.686 3996-3996/com.newmoney.night_life_now E/AndroidRuntime:com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run（ZygoteInit.java:1399） 12-01 21:48:08.686 3996-3996/com.newmoney.night_life_now E/AndroidRuntime:com.android.internal.os.ZygoteInit.main（ZygoteInit.java:1194） 12-01 21:48:08.686 3996-3996/com.newmoney.night_life_now E/AndroidRuntime:原因：android.view.InflateException:二进制XML文件行#21:膨胀类片段时出错 12-01 21:48:08.686 3996-3996/com.newmoney.night_life_now E/AndroidRuntime:at android.view.LayoutInflater.createViewFromTag（LayoutInflater.java:770） 12-01 21:48:08.686 3996-3996/com.newmoney.night_life_now E/AndroidRuntime:android.view.LayoutInflater.rInflate（LayoutInflater.java:813） 12-01 21:48:08.686 3996-3996/com.newmoney.night\u life\u now E/AndroidRuntime:android.view.LayoutInflater.rInflate（LayoutInflater.java:821） 12-01 21:48:08.686 3996-3996/com.newmoney.night\u life\u now E/AndroidRuntime:android.view.LayoutInflater.rInflate（LayoutInflater.java:821） 12-01 21:48:08.686 3996-3996/com.newmoney.night_life_now E/AndroidRuntime:at android.view.LayoutInflater.parseInclude（LayoutInflater.java:933） 12-01 21:48:08.686 3996-3996/com.newmoney.night_life_now E/AndroidRuntime:android.view.LayoutInflater.rInflate（LayoutInflater.java:809） 12-01 21:48:08.686 3996-3996/com.newmoney.night_life_now E/AndroidRuntime:at-android.view.LayoutInflater.inflate（LayoutInflater.java:511） 12-01 21:48:08.686 3996-3996/com.newmoney.night_life_now E/AndroidRuntime:at-android.view.LayoutInflater.inflate（LayoutInflater.java:415） 12-01 21:48:08.686 3996-3996/com.newmoney.night_life_now E/AndroidRuntime:at-android.view.LayoutInflater.inflate（LayoutInflater.java:366） 12-01 21:48:08.686 3996-3996/com.newmoney.night_life_now E/AndroidRuntime:位于android.support.v7.app.appcompatidelegateimplv7.setContentView（appcompatidelegateimplv7.java:249） 12-01 21:48:08.686 3996-3996/com.newmoney.night_life_now E/AndroidRuntime:位于android.support.v7.app.AppCompatActivity.setContentView（AppCompatActivity.java:106） 12-01 21:48:08.686 3996-3996/com.newmoney.night_life_now E/AndroidRuntime:com.newmoney.night_life_now.MainActivity.onCreate（MainActivity.java:27） 12-01 21:48:08.686 3996-3996/com.newmoney.night_life_now E/AndroidRuntime:at-android.app.Activity.performCreate（Activity.java:6289） 12-01 21:48:08.686 3996-3996/com.newmoney.night_life_now E/AndroidRuntime:at-android.app.Instrumentation.callActivityOnCreate（Instrumentation.java:1119） 12-01 21:48:08.686 3996-3996/com.newmoney.night_life_now E/AndroidRuntime:android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2646） 12-01 21:48:08.686 3996-3996/com.newmoney.night_life_now E/AndroidRuntime:android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:2758） 12-01 21:48:08.686 3996-3996/com.newmoney.night_life_now E/AndroidRuntime:android.app.ActivityThread.access$900（ActivityThread.java:177） 12-01 21:48:08.686 3996-3996/com.newmoney.night_life_now E/AndroidRuntime:android.app.ActivityThread$H.handleMessage（ActivityThread.java:1448） 12-01 21:48:08.686 3996-3996/com.newmoney.night_life_now E/AndroidRuntime:at android.os.Handler.dispatchMessage（Handler.java:102） 12-01 21:48:08.686 3996-3996/com.newmoney.night_life_now E/AndroidRuntime:at android.os.Looper.loop（Looper.java:145） 12-01 21:48:08.686 3996-3996/com.newmon

public class MainActivity extends AppCompatActivity {
// For this example, only two pages
static final int NUM_ITEMS = 3;
ViewPager mPager;
SlidePagerAdapter mPagerAdapter;

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

    Button clickButton = (Button) findViewById(R.id.getDirectionsButton);
    clickButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Toast.makeText(getApplicationContext(), "Get Directions Pressed", Toast.LENGTH_LONG).show();
        }
    });

    /* Instantiate a ViewPager and a PagerAdapter. */
    mPager = (ViewPager) findViewById(R.id.pager);
    mPagerAdapter = new SlidePagerAdapter(getSupportFragmentManager());
    mPager.setAdapter(mPagerAdapter);

}

/* PagerAdapter class */
public class SlidePagerAdapter extends FragmentPagerAdapter {
    public SlidePagerAdapter(FragmentManager fm) {
        super(fm);
    }

    @Override
    public Fragment getItem(int position) {
        /*
         * IMPORTANT: This is the point. We create a RootFragment acting as
         * a container for other fragments
         */
        if (position == 0) {
            Log.w("MainAct", "pos0");
            return new Picture_Section_Fragment().newInstance(position);
        } else {
            Log.w("MainAct", "pos1");
            return new Picture_Section_Fragment().newInstance(position);
        }
    }

    @Override
    public int getCount() {
        return NUM_ITEMS;
    }
}

public class Picture_Section_Fragment extends Fragment{
private int mPosition;
private ViewPager mPager;
private PagerAdapter mPagerAdapter;

public static Picture_Section_Fragment newInstance(int pos){
    Picture_Section_Fragment frag = new Picture_Section_Fragment();
    Bundle args = new Bundle();
    args.putInt("pos", pos);
    frag.setArguments(args);
    return frag;
}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    mPosition = getArguments().getInt("pos");
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    String urlString = null;
    View view = inflater.inflate(R.layout.picture_section_fragment, container, false);   // this is what layout to use for fragment
    //String urlString = "http://hdwallpapers.thenewstrack.com/wp-content/uploads/2015/08/New-York-City-Hd-Wallpaper-Free-Download-3.jpg";
    //new DownloadImageTask((ImageView) view.findViewById(R.id.barclubImages)).execute(urlString);

    //mPosition = getArguments().getInt("pos");

    switch(mPosition){
        case 0:
            Log.w("PicSecFrag", "Case0");
            urlString = "http://hdwallpapers.thenewstrack.com/wp-content/uploads/2015/08/New-York-City-Hd-Wallpaper-Free-Download-3.jpg";
            new DownloadImageTask((ImageView) view.findViewById(R.id.barclubImages)).execute(urlString);
            break;
        case 1:
            urlString = "http://7-themes.com/data_images/out/60/6975166-beach-hd-wallpaper-6468.jpg";
            new DownloadImageTask((ImageView) view.findViewById(R.id.barclubImages)).execute(urlString);
            break;
        default:
            urlString = "http://1.bp.blogspot.com/-9VWTk3LsUrU/UAe8GnV6hWI/AAAAAAAAHCw/ATOzf-5b230/s1600/Hdhut.blogspot.com+(12).jpg";
            new DownloadImageTask((ImageView) view.findViewById(R.id.barclubImages)).execute(urlString);
    }

    return view;
}

private class DownloadImageTask extends AsyncTask<String, Void, Bitmap> {
    ImageView bmImage;

    public DownloadImageTask(ImageView bmImage) {
        this.bmImage = bmImage;
    }

    protected Bitmap doInBackground(String... urls) {
        String urldisplay = urls[0];
        Bitmap mIcon11 = null;
        try {
            InputStream in = new java.net.URL(urldisplay).openStream();
            mIcon11 = BitmapFactory.decodeStream(in);
        } catch (Exception e) {
            Log.e("Error", e.getMessage());
            e.printStackTrace();
        }
        return mIcon11;
    }

    protected void onPostExecute(Bitmap result) {
        bmImage.setImageBitmap(result);
    }
}

return Picture_Section_Fragment.newInstance(position);