Question

我已经实现了标签布局设计，我想在有人点击viewpager中的图片时切换到其他标签。我的研究得出结论，在viewpager适配器上注册了一个click事件但是我找不到从适配器中获取选项卡布局id的方法。这是我的view pager适配器代码：

    public class BooksPagerAdapter extends PagerAdapter {
    private Context mContext;
    ViewPager viewPager;
    private ViewPager pager = null;
    ImageView image1;
    private int images[] = {R.drawable.lagers11, R.drawable.stout11, R.drawable.malts11, R.drawable.lagers11, R.drawable.stout11, R.drawable.malts11};
    public BooksPagerAdapter(Context context) {
        mContext = context;
    }

    @Override
    public Object instantiateItem(ViewGroup container, final int position) {
        LayoutInflater inflater = LayoutInflater.from(mContext);
        RelativeLayout relativeLayout = (RelativeLayout) ViewGroup.inflate(mContext, R.layout.tab_layout, null);
        View itemView = inflater.inflate(R.layout.shop_books, container, false);

        ImageView image1 = (ImageView) itemView.findViewById(R.id.image);
        image1.setImageResource(images[position]);
        itemView.setOnClickListener(new View.OnClickListener(){
            public void onClick(View v){
                //this will log the page number that was click
                Toast.makeText(mContext, position + " pagess", Toast.LENGTH_SHORT).show();

            }
        });
        ((ViewPager) container).addView(itemView);
        return itemView;

    }

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

    @Override
    public int getCount() {
        return (6);
    }

    @Override
    public float getPageWidth(int position) {
        return (0.3f);
    }

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

show_books layout

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical">
<ImageView
android:id="@+id/image"
android:layout_width="wrap_content"
android:padding="2dp"
android:layout_height="100dp" />
</FrameLayout>

标签布局

<RelativeLayout 
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@drawable/shattered"
android:orientation="vertical">
<android.support.design.widget.TabLayout
android:id="@+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/qb"
android:elevation="6dp"
app:tabGravity="fill"
app:tabIndicatorColor="#ffffff"
app:tabIndicatorHeight="3dp"
app:tabMode="scrollable"
app:tabSelectedTextColor="@color/tabSelectedTextColor"
app:tabTextColor="@color/tabTextColor">
</android.support.design.widget.TabLayout>
<android.support.v4.view.ViewPager
android:id="@+id/viewpagertabs"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@+id/tabs">
</android.support.v4.view.ViewPager>
</RelativeLayout>

Answer 1

简单，在Document document = Jsoup.connect(url).get(); String title = document.select("td ul li b").first().text(); String content = document.select("td ul li").first().ownText(); Element linkEl = document.select("td ul li p a").first(); String href = linkEl.attr("href"); String link = linkEl.text();图片中你应该试试这个

OnClick

Answer 2

您可以使用EventBus在您的活动或片段的子视图之间进行通信。首先定义一个事件：

public class ImageSelectedEvent {

    int index;

    public MessageEvent(int index) {
        this.index = index;
    }
}

注册此事件，如：

@Subscribe(threadMode = ThreadMode.MAIN)
public void onMessageEvent(ImageSelectedEvent event) {
    //TODO: make tab selected for event.index
}

为总线添加注册/取消注册代码：

@Override
public void onStart() {
    super.onStart();
    EventBus.getDefault().register(this);
}

@Override
public void onStop() {
    EventBus.getDefault().unregister(this);
    super.onStop();
}

最后在点击图片时使用这样的东西：

itemView.setOnClickListener(new View.OnClickListener(){
    public void onClick(View v){
        int index = //get image index
        EventBus.getDefault().post(new ImageSelectedEvent(index));
    }
});

您可以在此处找到更多信息：

How to get started with EventBus in 3 steps

从viewpager切换标签

2 个答案: