android RecyclerView的使用

最新推荐文章于 2024-09-07 00:06:36 发布

原创最新推荐文章于 2024-09-07 00:06:36 发布 · 310 阅读

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本文详细介绍了RecyclerView的使用方法，包括如何在项目中引入RecyclerView依赖、在XML布局文件中定义RecyclerView、设置不同的布局管理器以及创建适配器来填充数据。此外，还讲解了如何设置item之间的间距及实现多种类型的item布局。

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RecyclerView是谷歌V7包下新增的控件,用来替代ListView的使用,在RecyclerView标准化了ViewHolder类似于ListView中convertView用来做视图缓.

首先要用这个控件，你需要在gradle文件中添加包的引用

compile 'com.android.support:recyclerview-v7:21.0.3'

然后是在XML文件用使用它

<android.support.v7.widget.RecyclerView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/recycler_view"/>

接着在Activity中设置它

mRecyclerView.setLayoutManager(new LinearLayoutManager(this));//线性显示 类似于listview
//mRecyclerView.setLayoutManager(new GridLayoutManager(this, 2));//线性宫格显示 类似于GridView
//mRecyclerView.setLayoutManager(new StaggeredGridLayoutManager(2, OrientationHelper.VERTICAL));//线性宫格显示 类似于瀑布流
mRecyclerView.setAdapter(new NormalRecyclerViewAdapter(this));

然后是适配器

public class NormalRecyclerViewAdapter extends RecyclerView.Adapter<NormalRecyclerViewAdapter.NormalTextViewHolder> {
    private final LayoutInflater mLayoutInflater;
    private final Context mContext;
    private String[] mTitles;

    public NormalRecyclerViewAdapter(Context context, String[] title) {
        mTitles = title;
        mContext = context;
        mLayoutInflater = LayoutInflater.from(context);
    }

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

    @Override
    public void onBindViewHolder(NormalTextViewHolder holder, int position) {
        holder.mTextView.setText(mTitles[position]);
    }

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

    public static class NormalTextViewHolder extends RecyclerView.ViewHolder {
        @Bind(R.id.text_view)
        TextView mTextView;

        NormalTextViewHolder(View view) {
            super(view);
            ButterKnife.bind(this, view);
            view.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Log.d("NormalTextViewHolder", "onClick--> position = " + getPosition());
                }
            });
        }
    }
}

*设置item之间的距离

public class SpaceItemDecoration extends RecyclerView.ItemDecoration {
int space;

public SpaceItemDecoration(int s){
this.space = s;
}

@Override
public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
super.getItemOffsets(outRect, view, parent, state);
if(parent.getChildLayoutPosition(view)!=0){
outRect.top = space;
}
}
}

在程序中调用：

mRvDisplay.addItemDecoration(new SpaceItemDecoration(15));//设置item间距

*设置不同布局的item

public class MultipleItemAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
    public static enum ITEM_TYPE {
        ITEM_TYPE_IMAGE,
        ITEM_TYPE_TEXT
    }
    
    private final LayoutInflater mLayoutInflater;
    private final Context mContext;
    private String[] mTitles;

    public MultipleItemAdapter(Context context, String[] title) {
        mTitles = title;
        mContext = context;
        mLayoutInflater = LayoutInflater.from(context);
    }

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

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

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

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

    public static class TextViewHolder extends RecyclerView.ViewHolder {
        @Bind(R.id.text_view)
        TextView mTextView;

        TextViewHolder(View view) {
            super(view);
            ButterKnife.inject(this, view);
            view.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Log.d("TextViewHolder", "onClick--> position = " + getPosition());
                }
            });
        }
    }

    public static class ImageViewHolder extends RecyclerView.ViewHolder {
        @Bind(R.id.text_view)
        TextView mTextView;
        @Bind(R.id.image_view)
        ImageView mImageView;

        ImageViewHolder(View view) {
            super(view);
            ButterKnife.inject(this, view);
            view.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Log.d("ImageViewHolder", "onClick--> position = " + getPosition());
                }
            });
        } }}

设置分割线

public class MyItemDecoration extends RecyclerView.ItemDecoration
{
    private static final int[] ATTRS = {android.R.attr.listDivider};
    private Drawable mDivider;
    public MyItemDecoration(Context context)
    {
        TypedArray array = context.obtainStyledAttributes(ATTRS);
        // 获取分隔条

        mDivider = context.getResources().getDrawable(R.drawable.divider);

        array.recycle();
    }
    @Override
    public void onDrawOver(Canvas c, RecyclerView parent, RecyclerView.State state)
    {
        super.onDrawOver(c, parent, state);
        int count = parent.getChildCount();
        int left = parent.getPaddingLeft();
        int right = parent.getWidth()-parent.getPaddingRight();
        for(int i = 0; i < count; i++)
        {
            View v = parent.getChildAt(i);
            RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) v.getLayoutParams();
            int top = v.getBottom() + params.bottomMargin;
            int bottom = top + mDivider.getIntrinsicHeight();
            mDivider.setBounds(left,top,right,bottom);
            mDivider.draw(c);
        }
    }
}