RecyclerView的使用方法

最新推荐文章于 2024-07-08 16:47:10 发布

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最新推荐文章于 2024-07-08 16:47:10 发布

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文章标签：移动开发 python

原文链接：https://my.oschina.net/shenhuniurou/blog/825746

本文详细介绍了如何在Android应用中使用RecyclerView，包括导入依赖包、XML布局配置、适配器编写及多类型Item的支持等，并提供了定制分割线的方法。

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1、导入依赖包：

compile 'com.android.support:recyclerview-v7:x.x.x'

2、在xml中使用：

<android.support.v7.widget.RecyclerView
	android:id="@+id/recyclerview"
	android:layout_width="match_parent"
	android:layout_height="match_parent"
	app:layout_behavior="@string/appbar_scrolling_view_behavior">

3、在activity中实例化并设置适配器：

RecyclerView mRecyclerView = (RecyclerView) findViewById(R.id.recyclerview);
mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
mRecyclerView.setLayoutManager(new GridLayoutManager(this, 2));
mRecyclerView.setLayoutManager(new StaggeredGridLayoutManager(2, 1));
mRecyclerView.setAdapter(new RecyclerViewAdapter(this, titles));

GridLayoutManager第二个参数表示有多少列，StaggeredGridLayoutManager第一个参数表示有多少列，第二个表示滑动方向，0表示水平，1表示竖直。

4、构建适配器：

public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.TextViewHolder> {

    private final LayoutInflater mLayoutInflater;
    private final Context mContext;
    private List<String> mTitles;
    private OnItemClickListener listener;

    interface OnItemClickListener {
        public void OnItemClick(int position);
    }

    public void setOnItemClickListener(OnItemClickListener listener) {
        this.listener = listener;
    }

    public RecyclerViewAdapter(Context context, List<String> titles) {
        mTitles = titles;
        mContext = context;
        mLayoutInflater = LayoutInflater.from(context);
    }

    @Override
    public TextViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        return new TextViewHolder(mLayoutInflater.inflate(R.layout.item_text, parent, false));
    }

    @Override
    public void onBindViewHolder(TextViewHolder holder, int position) {
        holder.mTextView.setText(mTitles.get(position));
    }

    @Override
    public int getItemCount() {
        return mTitles == null ? 0 : mTitles.size();
    }

    public class TextViewHolder extends RecyclerView.ViewHolder {

        TextView mTextView;

        TextViewHolder(View view) {
            super(view);
            mTextView = (TextView) view.findViewById(R.id.text_view);
            view.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Log.d("TextViewHolder", "onClick--> position = " + getAdapterPosition());
                    //listener.OnItemClick(getAdapterPosition());
                }
            });
        }
    }

}

5、多类型Item的适配器：

public class MultipleTypeItemAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {

    public static enum ITEM_TYPE {
        ITEM_TYPE_TEXT,
        ITEM_TYPE_IMAGE
    }

    private final LayoutInflater mLayoutInflater;
    private final Context mContext;
    private List<String> mTitles;
    private RecyclerViewAdapter.OnItemClickListener listener;

    public MultipleTypeItemAdapter(Context context, List<String> titles) {
        mTitles = titles;
        mContext = context;
        mLayoutInflater = LayoutInflater.from(context);
    }


    @Override public int getItemViewType(int position) {
        return position % 2 == 0 ? ITEM_TYPE.ITEM_TYPE_IMAGE.ordinal() : ITEM_TYPE.ITEM_TYPE_TEXT.ordinal();
    }


    @Override public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        if (viewType == ITEM_TYPE.ITEM_TYPE_TEXT.ordinal()) {
            return new TextViewHolder(mLayoutInflater.inflate(R.layout.item_text, parent, false));
        } else {
            return new ImageViewHolder(mLayoutInflater.inflate(R.layout.item_image, parent, false));
        }
    }

    @Override public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
        if (holder instanceof TextViewHolder) {
            ((TextViewHolder) holder).mTextView.setText(mTitles.get(position));
        } else if (holder instanceof ImageViewHolder) {
            ((ImageViewHolder) holder).mTextView.setText(mTitles.get(position));
        }
    }


    @Override public int getItemCount() {
        return mTitles == null ? 0 : mTitles.size();
    }

    public class TextViewHolder extends RecyclerView.ViewHolder {

        TextView mTextView;

        TextViewHolder(View view) {
            super(view);
            mTextView = (TextView) view.findViewById(R.id.text_view);
            view.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Log.d("TextViewHolder", "onClick--> position = " + getAdapterPosition());
                    //listener.OnItemClick(getAdapterPosition());
                }
            });
        }
    }

    public class ImageViewHolder extends RecyclerView.ViewHolder {

        ImageView mImageView;
        TextView mTextView;

        ImageViewHolder(View view) {
            super(view);
            mImageView = (ImageView) view.findViewById(R.id.image_view);
            mTextView = (TextView) view.findViewById(R.id.text_view);
            view.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Log.d("ImageViewHolder", "onClick--> position = " + getAdapterPosition());
                    //listener.OnItemClick(getAdapterPosition());
                }
            });
        }
    }

}

跟ListView其实差不多吧，只要实现getItemViewType方法，不过不像ListView还需要实现getViewTypeCount方法。

6、定制分割线：

public class DividerItemDecoration extends RecyclerView.ItemDecoration {

    private 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 onDraw(Canvas c, RecyclerView parent) {
        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);
            RecyclerView v = new RecyclerView(parent.getContext());
            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, int itemPosition, RecyclerView parent) {
        if (mOrientation == VERTICAL_LIST) {
            outRect.set(0, 0, 0, mDivider.getIntrinsicHeight());
        } else {
            outRect.set(0, 0, mDivider.getIntrinsicWidth(), 0);
        }
    }

}

转载于:https://my.oschina.net/shenhuniurou/blog/825746