Question

This is my screenshot 我是Android开发的初学者，现在我正在开发一个应用程序，我PagerAdapter使用card view，实际上我引用此链接https://rubensousa.github.io/2016/08/viewpagercards ，我没有办法处理按钮。请允许任何人帮助我这样做，因为我是初学者和学习者。

public class CardPagerAdapter extends PagerAdapter implements CardAdapter {

private List<CardView> mViews;
private List<CardItem> mData;
private float mBaseElevation;
Context ctx;

public CardPagerAdapter() {
    mData = new ArrayList<>();
    mViews = new ArrayList<>();
}

public void addCardItem(CardItem item) {
    mViews.add(null);
    mData.add(item);
}

public float getBaseElevation() {
    return mBaseElevation;
}

@Override
public CardView getCardViewAt(int position) {
    System.out.println("getPosition" + position);

    return mViews.get(position);

}



@Override
public int getCount() {
    return mData.size();
}

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

@Override
public Object instantiateItem(ViewGroup container, int position) {
    View view = LayoutInflater.from(container.getContext())
            .inflate(R.layout.adapter, container, false);
    container.addView(view);
    bind(mData.get(position), view);



    CardView cardView = (CardView) view.findViewById(R.id.cardView);

    if (mBaseElevation == 0) {
        mBaseElevation = cardView.getCardElevation();
    }

    cardView.setMaxCardElevation(mBaseElevation * MAX_ELEVATION_FACTOR);
    mViews.set(position, cardView);
    return view;
}

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

private void bind(final CardItem item, View view) {
    TextView titleTextView = (TextView) view.findViewById(R.id.titleTextView);
    titleTextView.setText(item.getTitle());

}

}

这是代码

Answer 1

您所说的按钮是否在卡片视图中？如果你的意思是，那么。

从我在您所指的链接中看到的内容，然后我查看了示例。 https://github.com/rubensousa/ViewPagerCards/

该按钮位于adapter.xml中，但它仍然没有id。您可以为该按钮指定一个ID：

android:id="@+id/card_button"

然后，您可以通过在java类中设置单击侦听器来处理该按钮。例如：

Button theButton = (Button) view.findViewById(R.id.card_button);

theButton.setOnClickListener(new View.OnClickListener(){
                    @Override
                    public void onClick(View v){
                        //The Action Here
                    }
                });

希望这清楚你的问题。

Answer 2

Adapter.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/cardView"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    app:cardUseCompatPadding="true">

    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">


        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:orientation="vertical"
            android:padding="24dp">

            <TextView
                android:id="@+id/titleTextView"
                style="@style/TextAppearance.AppCompat.Title"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content" />

            <TextView
                android:id="@+id/contentTextView"
                style="@style/TextAppearance.AppCompat.Body1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="24dp"/>

            <Button
                android:id="@+id/btn_click"
                style="@style/ButtonStyle"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="24dp"
                android:text="Button" />
        </LinearLayout>

        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="top|end"
            android:layout_marginEnd="8dp"
            android:layout_marginRight="8dp"
            android:layout_marginTop="-5dp"
            android:src="@drawable/ic_bookmark_24dp" />

    </FrameLayout>

</android.support.v7.widget.CardView>

在CardPagerAdapter.java

public class CardPagerAdapter extends PagerAdapter implements CardAdapter {
    Button btn_click;
    private List<CardView> mViews;
    private List<CardItem> mData;
    private float mBaseElevation;
    Context mContext;

    public CardPagerAdapter(MainActivity mainActivity) {
        mData = new ArrayList<>();
        mViews = new ArrayList<>();
        mContext = mainActivity;
    }

    public void addCardItem(CardItem item) {
        mViews.add(null);
        mData.add(item);
    }

    public float getBaseElevation() {
        return mBaseElevation;
    }

    @Override
    public CardView getCardViewAt(int position) {
        return mViews.get(position);
    }

    @Override
    public int getCount() {
        return mData.size();
    }

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

    @Override
    public Object instantiateItem(ViewGroup container, final int position) {
        View view = LayoutInflater.from(container.getContext())
                .inflate(R.layout.adapter, container, false);
        container.addView(view);
        bind(mData.get(position), view);
        CardView cardView = (CardView) view.findViewById(R.id.cardView);

        if (mBaseElevation == 0) {
            mBaseElevation = cardView.getCardElevation();
        }

        cardView.setMaxCardElevation(mBaseElevation * MAX_ELEVATION_FACTOR);
        mViews.set(position, cardView);

        btn_click.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(mContext, "List Position " + position, Toast.LENGTH_SHORT).show();
            }
        });

        return view;
    }

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

    private void bind(CardItem item, View view) {
        TextView titleTextView = (TextView) view.findViewById(R.id.titleTextView);
        TextView contentTextView = (TextView) view.findViewById(R.id.contentTextView);
        btn_click = (Button) view.findViewById(R.id.btn_click);

        titleTextView.setText(item.getTitle());
        contentTextView.setText(item.getText());

    }

}

您必须在适配器中更改添加上下文。

MainActivity.java

    mCardAdapter = new CardPagerAdapter(MainActivity.this);

这将有所帮助

ViewPager卡灵感来自Duolingo

2 个答案: