Android Viewpager 作为图片幻灯片库 [英] Android Viewpager as Image Slide Gallery

问题描述

我正在使用 Jake 的 来实现?

解决方案

在 Jake 的 ViewPageIndicator 中，他实现了 View pager 来显示一个字符串数组(即["this","is","a","text"]) 您从 YourAdapter.java(扩展 FragmentPagerAdapter)传递到 YourFragment.java，后者将 View 返回给 viewpager.

为了显示不同的内容，您只需更改传递的上下文类型.在这种情况下，您希望传递图像而不是文本，如下面的示例所示:

这是您设置 Viewpager 的方式:

公共类 PlaceDetailsFragment 扩展 SherlockFragment {PlaceSlidesFragmentAdapter mAdapter;ViewPager mPager；PageIndicator mIndicator;公共静态最终字符串标签=detailsFragment"；@覆盖public View onCreateView(LayoutInflater inflater, ViewGroup 容器,捆绑保存的InstanceState){查看视图 = inflater.inflate(R.layout.fragment_place_details,容器，假)；mAdapter = new PlaceSlidesFragmentAdapter(getActivity().getSupportFragmentManager());mPager = (ViewPager) view.findViewById(R.id.pager);mPager.setAdapter(mAdapter);mIndicator = (CirclePageIndicator) view.findViewById(R.id.indicator);mIndicator.setViewPager(mPager);((CirclePageIndicator) mIndicator).setSnap(true);米指标.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {@覆盖公共无效 onPageSelected(int position) {Toast.makeText(PlaceDetailsFragment.this.getActivity(),更改为页面"+位置，Toast.LENGTH_SHORT).show();}@覆盖公共无效onPageScrolled(int位置，浮动位置偏移，int positionOffsetPixels){}@覆盖公共无效 onPageScrollStateChanged(int state) {}});返回视图；}}

your_layout.xml

<?xml version="1.0" encoding="utf-8"?><线性布局 xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="垂直">

YourAdapter.java

公共类 PlaceSlidesFragmentAdapter 扩展 FragmentPagerAdapter 实现IconPagerAdapter {私有 int[] 图片 = new int[] { R.drawable.photo1, R.drawable.photo2,R.drawable.photo3，R.drawable.photo4};protected static final int[] ICONS = new int[] { R.drawable.marker,R.drawable.marker, R.drawable.marker, R.drawable.marker };私人 int mCount = Images.length;公共 PlaceSlidesFragmentAdapter(FragmentManager fm) {超级(调频)；}@覆盖公共片段getItem(int位置){返回新的 PlaceSlideFragment(图像 [位置])；}@覆盖公共 int getCount() {返回 mCount；}@覆盖公共 int getIconResId(int index) {返回图标[索引 % 图标长度]；}公共无效setCount(整数计数){if (count > 0 && count <= 10) {mCount = 计数；notifyDataSetChanged();}}}

YourFragment.java

//你需要从这里返回图片而不是文本.//

public final class PlaceSlideFragment extends Fragment {int imageResourceId;公共 PlaceSlideFragment(int i) {图像资源 ID = i;}@覆盖公共无效 onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);}@覆盖public View onCreateView(LayoutInflater inflater, ViewGroup 容器,捆绑保存的InstanceState){ImageView 图像 = 新 ImageView(getActivity());image.setImageResource(imageResourceId);线性布局布局=新线性布局(getActivity())；layout.setLayoutParams(新 LayoutParams());layout.setGravity(Gravity.CENTER);布局.addView(图像);返回布局；}}

你应该从上面的代码中得到一个像这样的 View pager.

I am using Jake's ViewPageIndicator and want to display Images like a swipe gallery. Any refernce link where i can get started. I have implemented the basic viewpager and now want to implement image viewpaper as below

Is it possible to to achieve using ViewPageIndicator ?

解决方案

In Jake's ViewPageIndicator he has implemented View pager to display a String array (i.e. ["this","is","a","text"]) which you pass from YourAdapter.java (that extends FragmentPagerAdapter) to the YourFragment.java which returns a View to the viewpager.

In order to display something different, you simply have to change the context type your passing. In this case you want to pass images instead of text, as shown in the sample below:

This is how you setup your Viewpager:

public class PlaceDetailsFragment extends SherlockFragment {
    PlaceSlidesFragmentAdapter mAdapter;
    ViewPager mPager;
    PageIndicator mIndicator;

    public static final String TAG = "detailsFragment";

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_place_details,
                container, false);

        mAdapter = new PlaceSlidesFragmentAdapter(getActivity()
                .getSupportFragmentManager());

        mPager = (ViewPager) view.findViewById(R.id.pager);
        mPager.setAdapter(mAdapter);

        mIndicator = (CirclePageIndicator) view.findViewById(R.id.indicator);
        mIndicator.setViewPager(mPager);
        ((CirclePageIndicator) mIndicator).setSnap(true);

        mIndicator
                .setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
                    @Override
                    public void onPageSelected(int position) {
                        Toast.makeText(PlaceDetailsFragment.this.getActivity(),
                                "Changed to page " + position,
                                Toast.LENGTH_SHORT).show();
                    }

                    @Override
                    public void onPageScrolled(int position,
                            float positionOffset, int positionOffsetPixels) {
                    }

                    @Override
                    public void onPageScrollStateChanged(int state) {
                    }
                });
        return view;
    }

}

your_layout.xml

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



    <android.support.v4.view.ViewPager
        android:id="@+id/pager"
        android:layout_width="fill_parent"
        android:layout_height="0dp"
        android:layout_weight="1" />

    <com.viewpagerindicator.CirclePageIndicator
        android:id="@+id/indicator"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:padding="10dip" />

</LinearLayout>

YourAdapter.java

public class PlaceSlidesFragmentAdapter extends FragmentPagerAdapter implements
        IconPagerAdapter {

    private int[] Images = new int[] { R.drawable.photo1, R.drawable.photo2,
            R.drawable.photo3, R.drawable.photo4

    };

    protected static final int[] ICONS = new int[] { R.drawable.marker,
            R.drawable.marker, R.drawable.marker, R.drawable.marker };

    private int mCount = Images.length;

    public PlaceSlidesFragmentAdapter(FragmentManager fm) {
        super(fm);
    }

    @Override
    public Fragment getItem(int position) {
        return new PlaceSlideFragment(Images[position]);
    }

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

    @Override
    public int getIconResId(int index) {
        return ICONS[index % ICONS.length];
    }

    public void setCount(int count) {
        if (count > 0 && count <= 10) {
            mCount = count;
            notifyDataSetChanged();
        }
    }
}

YourFragment.java

// you need to return image instaed of text from here.//

public final class PlaceSlideFragment extends Fragment {
    int imageResourceId;

    public PlaceSlideFragment(int i) {
        imageResourceId = i;
    }

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

    }

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

        ImageView image = new ImageView(getActivity());
        image.setImageResource(imageResourceId);

        LinearLayout layout = new LinearLayout(getActivity());
        layout.setLayoutParams(new LayoutParams());

        layout.setGravity(Gravity.CENTER);
        layout.addView(image);

        return layout;
    }
}

You should get a View pager like this from the above code.

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