android RecyclerView的使用

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);        }    }}