Question

我想为我的Android应用程序创建自定义行适配器。所以我建立了这个：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:focusable="true"
    android:paddingLeft="16dp"
    android:paddingRight="16dp"
    android:paddingTop="5dp"
    android:clickable="true"
    android:orientation="vertical">

    <TextView
        android:id="@+id/medication"
        android:textColor="@color/white"
        android:textSize="16dp"
        android:textStyle="bold"
        android:layout_width="120dp"
        android:layout_height="wrap_content"
        />
    <TextView
        android:id="@+id/instructions"
        android:textColor="@color/white"
        android:layout_toRightOf="@+id/medication"
        android:layout_width="170dp"
        android:layout_height="wrap_content"
        />

    <TextView
        android:id="@+id/startDate"
        android:textColor="@color/white"
        android:layout_width="100dp"
        android:layout_toRightOf="@+id/instructions"
        android:layout_height="wrap_content"
        />

    <TextView
        android:id="@+id/active"
        android:textColor="@color/white"
        android:layout_width="match_parent"
        android:layout_toRightOf="@+id/startDate"
        android:layout_height="wrap_content"
        />
</RelativeLayout>

现在我已经构建了这个适配器类“MedicationAdapter.java”：

public class MedicationAdapter extends RecyclerView.Adapter<MedicationAdapter.MyMedicationViewHolder> {

    private List<Medication> moviesList;

    public class MyMedicationViewHolder extends RecyclerView.ViewHolder {
        public TextView medication, instruction, startDate,active;

        public MyMedicationViewHolder(View view) {
            super(view);
            medication = (TextView) view.findViewById(R.id.medication);
            instruction = (TextView) view.findViewById(R.id.instructions);
            startDate = (TextView) view.findViewById(R.id.startDate);
            active = (TextView) view.findViewById(R.id.active);
        }
    }


    public MedicationAdapter(List<Medication> moviesList) {
        this.moviesList = moviesList;
    }

    @Override
    public MyMedicationViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View itemView = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.medications_list_row, parent, false);

        return new MyMedicationViewHolder(itemView);
    }

    @Override
    public void onBindViewHolder(MyMedicationViewHolder holder, int position) {
        Medication medication = moviesList.get(position);
        holder.medication.setText(medication.getDrugInfo().getDisplayName());
        holder.instruction.setText(medication.getFrequency()+" "+ medication.getDose());
        holder.startDate.setText(medication.getDateStart());
        holder.active.setText("SI");
    }

    @Override
    public int getItemCount() {
        return moviesList.size();
    }
}

现在，如果我尝试运行我的Android应用程序，我可以看到我的活动：

现在我想在此列表的头部插入标题文本，并且我想在每个单元格中插入边框线。

可以这样做吗？

问候

Answer 1

是的，这是可能的。您可以为RecyclerView实现标头。请看这个答案https://stackoverflow.com/a/26573338/1554094

您可以使用item decoration。对同一问题How to add dividers and spaces between items in RecyclerView?

有答案

或者您可以在视图项目底部添加高度为1dp的视图

Answer 2

您可以尝试以下代码在recyclerview中设置标题

 public class HeaderAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private static final int TYPE_HEADER = 0;
private static final int TYPE_ITEM = 1;
String[] data;

public HeaderAdapter(String[] data) {
    this.data = data;
}

@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    if (viewType == TYPE_ITEM) {
        //inflate your layout and pass it to view holder
        return new VHItem(null);
    } else if (viewType == TYPE_HEADER) {
        //inflate your layout and pass it to view holder
        return new VHHeader(null);
    }

    throw new RuntimeException("there is no type that matches the type " + viewType + " + make sure your using types correctly");
}

@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
    if (holder instanceof VHItem) {
        String dataItem = getItem(position);
        //cast holder to VHItem and set data
    } else if (holder instanceof VHHeader) {
        //cast holder to VHHeader and set data for header.
    }
}

@Override
public int getItemCount() {
    return data.length + 1;
}

@Override
public int getItemViewType(int position) {
    if (isPositionHeader(position))
        return TYPE_HEADER;

    return TYPE_ITEM;
}

private boolean isPositionHeader(int position) {
    return position == 0;
}

private String getItem(int position) {
    return data[position - 1];
}

class VHItem extends RecyclerView.ViewHolder {
    TextView title;

    public VHItem(View itemView) {
        super(itemView);
    }
}

class VHHeader extends RecyclerView.ViewHolder {
    Button button;

    public VHHeader(View itemView) {
        super(itemView);
    }
}

}

Answer 3

for Recyclerview中的边框

  recyclerView.addItemDecoration(new DividerItemDecoration(this,  LinearLayoutManager.VERTICAL));

//设置适配器 recyclerView.setAdapter（mAdapter）;

public class DividerItemDecoration extends RecyclerView.ItemDecoration {

private static final int[] ATTRS = new int[]{
        android.R.attr.listDivider
};

public static final int HORIZONTAL_LIST = LinearLayoutManager.HORIZONTAL;

public static final int VERTICAL_LIST = LinearLayoutManager.VERTICAL;

private Drawable mDivider;

private int mOrientation;

public DividerItemDecoration(Context context, int orientation) {
    final TypedArray a = context.obtainStyledAttributes(ATTRS);
    mDivider = a.getDrawable(0);
    a.recycle();
    setOrientation(orientation);
}

public void setOrientation(int orientation) {
    if (orientation != HORIZONTAL_LIST && orientation != VERTICAL_LIST) {
        throw new IllegalArgumentException("invalid orientation");
    }
    mOrientation = orientation;
}

@Override
public void onDrawOver(Canvas c, RecyclerView parent, RecyclerView.State state) {
    if (mOrientation == VERTICAL_LIST) {
        drawVertical(c, parent);
    } else {
        drawHorizontal(c, parent);
    }
}

public void drawVertical(Canvas c, RecyclerView parent) {
    final int left = parent.getPaddingLeft();
    final int right = parent.getWidth() - parent.getPaddingRight();

    final int childCount = parent.getChildCount();
    for (int i = 0; i < childCount; i++) {
        final View child = parent.getChildAt(i);
        final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
                .getLayoutParams();
        final int top = child.getBottom() + params.bottomMargin;
        final int bottom = top + mDivider.getIntrinsicHeight();
        mDivider.setBounds(left, top, right, bottom);
        mDivider.draw(c);
    }
}

public void drawHorizontal(Canvas c, RecyclerView parent) {
    final int top = parent.getPaddingTop();
    final int bottom = parent.getHeight() - parent.getPaddingBottom();

    final int childCount = parent.getChildCount();
    for (int i = 0; i < childCount; i++) {
        final View child = parent.getChildAt(i);
        final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
                .getLayoutParams();
        final int left = child.getRight() + params.rightMargin;
        final int right = left + mDivider.getIntrinsicHeight();
        mDivider.setBounds(left, top, right, bottom);
        mDivider.draw(c);
    }
}

@Override
public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
    if (mOrientation == VERTICAL_LIST) {
        outRect.set(0, 0, 0, mDivider.getIntrinsicHeight());
    } else {
        outRect.set(0, 0, mDivider.getIntrinsicWidth(), 0);
    }
}

}

如何在自定义适配器列表中插入标题行

3 个答案: