Android控件RecyclerView实现混排效果仿网易云音乐

前言

最近在使用网易云音乐的时候，看到如下图的排版效果图，自己也想实现一个

这里采用网上用法最多的方式，而且是比较简单的方式实现的，想要做项目的同学也可以快速入手搞定首页界面，可以在最快的时间内模仿出来，且效果达到90%以上的相似

效果演示

至于图片的加载你们可以根据网上的Api获取相应的图片加载到对应的位置，这里只是采用本地图片来演示

实现分析

这里是采用RecyclerView的GridLayoutManager的一个SpanSize这么一个东西，从下图很容易知道其意思

项目结构

项目结构可能对初学者感觉很庞大，不用担心，这里我会按照下面的包名划分，从最简单的开始分析

引入依赖

首先是在Gradle中引入对RecyclerView的依赖

compile 'com.android.support:recyclerview-v7:25.3.1'

View包

由于项目用到的图片是有规格限定的，所以需要对ImageView覆写，得到我们想要尺寸的图片

SquareImageView：正方形图片
RectImageView：长方形图片

public class SquareImageView extends android.support.v7.widget.AppCompatImageView {

  public SquareImageView(Context context) {
    this(context,null);
  }

  public SquareImageView(Context context, @Nullable AttributeSet attrs) {
    this(context, attrs,0);
  }

  public SquareImageView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);

    setScaleType(ScaleType.FIT_XY);
  }

  @Override
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    super.onMeasure(widthMeasureSpec, widthMeasureSpec);
  }
}

public class RectImageView extends android.support.v7.widget.AppCompatImageView {

  public RectImageView(Context context) {
    this(context, null);
  }

  public RectImageView(Context context, @Nullable AttributeSet attrs) {
    this(context, attrs, 0);
  }

  public RectImageView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);

    setScaleType(ScaleType.FIT_XY);
  }

  @Override
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    int widthMode = MeasureSpec.getMode(widthMeasureSpec);
    int width = MeasureSpec.getSize(widthMeasureSpec);
    // 设置大小为宽度的三分之二
    int halfWidthMeasureSpec = MeasureSpec.makeMeasureSpec(width / 3 * 2, widthMode);
    super.onMeasure(widthMeasureSpec, halfWidthMeasureSpec);
  }
}

Music包

这里是我们存储实体的地方，其中四种类型的划分，分别对应项目展示中的前三个模块的划分，其中还有一个标题也算是一种类型，所以共四种

public class Music {

  public int type;
  public String title;
  // 后期可加入Glide加载网络图片Url
  public int imageId;

  public interface TYPE {
    int TYPE_GRID_THREE = 0x01;
    int TYPE_GRID_TWO = 0x02;
    int TYPE_LIST = 0x03;
    int TYPE_TITLE = 0x04;
  }
}

Listener包

由于RecyclerView自身是没有点击事件的，所以这个包是RecyclerView的点击事件接口

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

Decoration包

由于RecyclerView是不提供分割线的，所以这个包是自定义的分割线

public class SpacesItemDecoration extends RecyclerView.ItemDecoration {

  private int space;

  public SpacesItemDecoration(int space) {
    this.space = space;
  }

  @Override
  public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
    outRect.left = space;
    outRect.right = space;
    outRect.bottom = space;
    outRect.top = space;
  }
}

ViewHolder

这里存储的是我们混排效果的控件，标题可能会有点区别，其他是一样的效果，为了后期方便拓展，我们就把他们分开，不代码复用

public class GridThreeViewHolder extends RecyclerView.ViewHolder {

  public SquareImageView iv_icon;
  public TextView tv_content;

  public GridThreeViewHolder(View itemView) {
    super(itemView);
    iv_icon = (SquareImageView) itemView.findViewById(R.id.iv_icon);
    tv_content = (TextView) itemView.findViewById(R.id.tv_content);
  }
}

public class GridTwoViewHolder extends RecyclerView.ViewHolder {

  public RectImageView iv_icon;
  public TextView tv_content;

  public GridTwoViewHolder(View itemView) {
    super(itemView);
    iv_icon = (RectImageView) itemView.findViewById(R.id.iv_icon);
    tv_content = (TextView) itemView.findViewById(R.id.tv_content);
  }
}

public class ListViewHolder extends RecyclerView.ViewHolder {

  public RectImageView iv_icon;
  public TextView tv_content;

  public ListViewHolder(View itemView) {
    super(itemView);
    iv_icon = (RectImageView) itemView.findViewById(R.id.iv_icon);
    tv_content = (TextView) itemView.findViewById(R.id.tv_content);
  }
}

public class TitleViewHolder extends RecyclerView.ViewHolder {

  public TextView tv_content;

  public TitleViewHolder(View itemView) {
    super(itemView);
    tv_content = (TextView) itemView.findViewById(R.id.tv_content);
  }
}

Adapter包

这里就是对所有ViewHolder的控制器，然而这里并不是混排效果实现的最终地方，只不过是填充数据的地方

public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> implements View.OnClickListener {

  private List<Music> mList;
  private Context mContext;
  private LayoutInflater mInflater;

  /**
   * 点击事件
   */
  private OnItemClickListener mOnItemClickListener;

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

  public RecyclerAdapter(Context context, List<Music> list) {
    this.mList = list;
    this.mContext = context;
    this.mInflater = LayoutInflater.from(context);
  }

  @Override
  public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View view;
    RecyclerView.ViewHolder mViewHolder = null;
    if (viewType == Music.TYPE.TYPE_GRID_THREE) {
      view = mInflater.inflate(R.layout.item_grid_three, parent, false);
      mViewHolder = new GridThreeViewHolder(view);
    } else if (viewType == Music.TYPE.TYPE_GRID_TWO) {
      view = mInflater.inflate(R.layout.item_grid_two, parent, false);
      mViewHolder = new GridTwoViewHolder(view);
    } else if (viewType == Music.TYPE.TYPE_LIST) {
      view = mInflater.inflate(R.layout.item_list, parent, false);
      mViewHolder = new ListViewHolder(view);
    } else if (viewType == Music.TYPE.TYPE_TITLE) {
      view = mInflater.inflate(R.layout.item_title, parent, false);
      mViewHolder = new TitleViewHolder(view);
    }
    return mViewHolder;
  }

  @Override
  public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
    switch (getItemViewType(position)) {
      case Music.TYPE.TYPE_GRID_THREE:
        GridThreeViewHolder gHolder_three = (GridThreeViewHolder) holder;
        gHolder_three.tv_content.setText(mList.get(position).title);
        gHolder_three.iv_icon.setImageResource(mList.get(position).imageId);
        //点击事件
        gHolder_three.itemView.setOnClickListener(this);
        gHolder_three.itemView.setTag(position);
        break;
      case Music.TYPE.TYPE_GRID_TWO:
        GridTwoViewHolder gHolder_two = (GridTwoViewHolder) holder;
        gHolder_two.tv_content.setText(mList.get(position).title);
        gHolder_two.iv_icon.setImageResource(mList.get(position).imageId);
        //点击事件
        gHolder_two.itemView.setOnClickListener(this);
        gHolder_two.itemView.setTag(position);
        break;
      case Music.TYPE.TYPE_LIST:
        ListViewHolder lHolder = (ListViewHolder) holder;
        lHolder.tv_content.setText(mList.get(position).title);
        lHolder.iv_icon.setImageResource(mList.get(position).imageId);
        //点击事件
        lHolder.itemView.setOnClickListener(this);
        lHolder.itemView.setTag(position);
        break;
      case Music.TYPE.TYPE_TITLE:
        TitleViewHolder tHolder = (TitleViewHolder) holder;
        tHolder.tv_content.setText(mList.get(position).title);
        //点击事件
        tHolder.itemView.setOnClickListener(this);
        tHolder.itemView.setTag(position);
        break;
    }
  }

  @Override
  public int getItemViewType(int position) {
    return mList.get(position).type;
  }

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

  @Override
  public void onClick(View v) {
    if (mOnItemClickListener != null) {
      int position = (int) v.getTag();
      mOnItemClickListener.OnItemClick(position);
    }
  }
}

Activity

这里就是我们实现混排效果的关键，我们会根据不同类型的数据，对RecyclerView的SpanSize的进行设置

public class MainActivity extends AppCompatActivity implements OnItemClickListener {

  private RecyclerView ry;
  private GridLayoutManager layoutManager;
  private RecyclerAdapter mAdapter;
  private static List<Music> mList;

  /**
   * 模拟本地数据
   */
  static {
    mList = new ArrayList<>();

    for (int i = 0; i < 1; i++) {
      Music music = new Music();
      music.type = Music.TYPE.TYPE_TITLE;
      music.imageId = R.drawable.ic_cover;
      music.title = "推荐歌单";
      mList.add(music);
    }

    for (int i = 0; i < 6; i++) {
      Music music = new Music();
      music.type = Music.TYPE.TYPE_GRID_THREE;
      music.imageId = R.drawable.ic_cover;
      music.title = "先不要降温！我没钱买衣服";
      mList.add(music);
    }

    for (int i = 0; i < 1; i++) {
      Music music = new Music();
      music.type = Music.TYPE.TYPE_TITLE;
      music.imageId = R.drawable.ic_cover;
      music.title = "推荐MV";
      mList.add(music);
    }

    for (int i = 0; i < 4; i++) {
      Music music = new Music();
      music.type = Music.TYPE.TYPE_GRID_TWO;
      music.imageId = R.drawable.ic_cover;
      music.title = "Perfect Day";
      mList.add(music);
    }

    for (int i = 0; i < 1; i++) {
      Music music = new Music();
      music.type = Music.TYPE.TYPE_TITLE;
      music.imageId = R.drawable.ic_cover;
      music.title = "精选专栏";
      mList.add(music);
    }

    for (int i = 0; i < 3; i++) {
      Music music = new Music();
      music.type = Music.TYPE.TYPE_LIST;
      music.imageId = R.drawable.ic_cover;
      music.title = "去看《银翼杀手2049》前，你应该知道的三件事";
      mList.add(music);
    }

    for (int i = 0; i < 1; i++) {
      Music music = new Music();
      music.type = Music.TYPE.TYPE_TITLE;
      music.imageId = R.drawable.ic_cover;
      music.title = "最新音乐";
      mList.add(music);
    }

    for (int i = 0; i < 6; i++) {
      Music music = new Music();
      music.type = Music.TYPE.TYPE_GRID_THREE;
      music.imageId = R.drawable.ic_cover;
      music.title = "[BGM]一定听过的神级背景配乐";
      mList.add(music);
    }
  }

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    ry = (RecyclerView) findViewById(R.id.ry);
    layoutManager = new GridLayoutManager(this, 6);
    layoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
      @Override
      public int getSpanSize(int position) {
        int type = mList.get(position).type;
        if (type == Music.TYPE.TYPE_GRID_THREE) {
          return 2;
        } else if (type == Music.TYPE.TYPE_GRID_TWO) {
          return 3;
        } else if (type == Music.TYPE.TYPE_LIST) {
          return 6;
        } else if (type == Music.TYPE.TYPE_TITLE) {
          return 6;
        }
        return 0;
      }
    });
    ry.setLayoutManager(layoutManager);
    ry.addItemDecoration(new SpacesItemDecoration(2));

    // 填充数据
    mAdapter = new RecyclerAdapter(this, mList);
    mAdapter.setOnItemClickListener(this);
    ry.setAdapter(mAdapter);

  }

  @Override
  public void OnItemClick(int position) {
    String title = mList.get(position).title;
    Toast.makeText(this, title, Toast.LENGTH_SHORT).show();
  }
}

layout布局文件

这里的布局很简单，比如用到我们的正方形图片，长方形图片等，这里就不做代码贴出，详细可以查看源码

源码下载

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