Question

我有Activity tabLayout，我试图通过实施ViewPagerAdapter在第一个片段上创建图片 SlidShow ，我是使用带圆圈指示符的slidshow，圆圈指示符会成功显示，但图像不会显示。

这就是我所做的：

我的片段xml布局：注意我RecyclerView底部的水平ViewPager正常工作。

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

    <android.support.constraint.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/topLayout">

        <RelativeLayout
            android:id="@+id/sliderLyout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintRight_toRightOf="parent">

            <android.support.v4.view.ViewPager
                android:id="@+id/sliderPager"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_alignParentTop="true" />
            <me.relex.circleindicator.CircleIndicator
                android:id="@+id/indicator"
                android:layout_width="match_parent"
                android:layout_height="48dp"
                android:layout_alignParentBottom="true"/>

        </RelativeLayout>

        <RelativeLayout
            android:id="@+id/title_layout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:paddingBottom="5dp"
            android:paddingTop="5dp"
            android:paddingLeft="10dp"
            android:paddingStart="10dp"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toBottomOf="@id/sliderLyout">


            <com.biliki.biliki.bilikiapp.uitemplate.font.RobotoTextView
                android:id="@+id/itemTitle"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignParentLeft="true"
                android:layout_alignParentStart="true"
                android:layout_centerVertical="true"
                android:layout_gravity="center_vertical"
                android:layout_toLeftOf="@+id/btnMore"
                android:paddingLeft="10dp"
                android:text="@string/lastoffersTitle"
                style="@style/TextViewAppearance.Title"
                />
        </RelativeLayout>

        <android.support.v7.widget.RecyclerView
            android:id="@+id/my_list_recycler"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginLeft="5dp"
            android:layout_marginRight="5dp"
            android:layout_marginStart="5dp"
            android:layout_marginEnd="5dp"

            android:orientation="horizontal"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintTop_toBottomOf="@id/title_layout"
            app:layout_constraintVertical_bias="0.0"
            app:rvp_singlePageFling="true"
            app:rvp_triggerOffset="0.1" />

        <RelativeLayout
            android:id="@+id/restLayout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="8dp"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toBottomOf="@id/my_list_recycler">

            <com.biliki.biliki.bilikiapp.uitemplate.font.RobotoTextView
                android:id="@+id/restTitle"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignParentLeft="true"
                android:layout_alignParentStart="true"
                android:layout_centerVertical="true"
                android:layout_gravity="center_vertical"
                android:paddingLeft="10dp"
                android:text="@string/restTitle"
                style="@style/TextViewAppearance.Title"/>
        </RelativeLayout>

        <android.support.v7.widget.RecyclerView
            android:id="@+id/restaurantsRecycler"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginLeft="5dp"
            android:layout_marginRight="5dp"
            android:orientation="horizontal"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toBottomOf="@id/restLayout">
        </android.support.v7.widget.RecyclerView>

    </android.support.constraint.ConstraintLayout>

</ScrollView>

这是我的适配器类：我使用Glide Library加载图像。

public class SliderAdapter extends PagerAdapter {

    private Context mContext;
    private int[] mDataList;

    public SliderAdapter(Context mContext, int[] mDataList) {
        this.mContext = mContext;
        this.mDataList = mDataList;
    }

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

        View rootView = LayoutInflater.from(mContext).inflate(R.layout.slider_item_layout, container , false);

        ImageView slideImg = (ImageView) rootView.findViewById(R.id.slide_img);
        int img = mDataList[position];


        GlideApp.
                with(mContext)
                .load(img)
                .centerCrop()
                .transition(DrawableTransitionOptions.withCrossFade())
                .into(slideImg);

        container.addView(rootView, 0);
        return rootView;
    }

    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        container.removeView((View) object);
    }

    @Override
    public int getCount() {

        if(mDataList.length >0){
            return mDataList.length;
        }
        else{
            return 0;
        }
    }

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

片段类：

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

        //...

        sliderPager = (ViewPager) rootView.findViewById(R.id.sliderPager);
        sliderPager.setAdapter(new SliderAdapter(getContext(),picturesList));
        CircleIndicator indicator = (CircleIndicator)rootView.findViewById(R.id.indicator);
        indicator.setViewPager(sliderPager);

        // Auto start of viewpager
        final Handler handler = new Handler();
        final Runnable Update = new Runnable() {
            public void run() {
                if (currentPage == picturesList.length) {
                    currentPage = 0;
                }
                sliderPager.setCurrentItem(currentPage++, true);
            }
        };
        Timer swipeTimer = new Timer();
        swipeTimer.schedule(new TimerTask() {
            @Override
            public void run() {
                handler.post(Update);
            }
        }, 2500, 2500);

        return  rootView;
    }

最后这是结果：

无法在ViewPager中的ImageView中加载图像

0 个答案: