Android RecycleView实现混合Item布局

首先来看看效果吧：

效果预览.png

本实例来自于慕课网的视屏http://www.imooc.com/video/13046,实现步骤可以自己去观看视屏，这里只记录了下实现的代码。

添加依赖：

(1) 在项目的build.gradle文件中添加下面的依赖

compile 'com.android.support:recyclerview-v7:25.0.0'

(2) 也可以在下图中自动进行依赖，选择RecycleView即可。

 

代码部分

直接代码传送门
MainActivity

public class MainActivity extends AppCompatActivity {

    private RecyclerView mRecyclerView;
    private MyAdapter mMyAdapter;


    private int colors[] = {android.R.color.holo_blue_bright,android.R.color.black,android.R.color.holo_red_dark};

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

    private void initView() {
        mRecyclerView = (RecyclerView) findViewById(R.id.id_recyclerView);
        mRecyclerView.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.VERTICAL,
                false));
        mMyAdapter = new MyAdapter(this);
        mRecyclerView.setAdapter(mMyAdapter);

    }

    private void initData() {
        List<Person>  list= new ArrayList<>();
        for (int i = 0; i < 20; i++) {
            Person p = new Person();
            int type = (int) (Math.random()*3+1);
            p.type = type;
            p.content="content"+1;
            p.avaterColor = colors[type-1];
            p.name = "name"+i;
            list.add(p);
        }
        mMyAdapter.addList(list);
        mMyAdapter.notifyDataSetChanged();
    }
}

bean对象Person类

/**
 * Created by 24540 on 2017/3/13.
 */

public class Person {
    public  static final int TYPE_ONE = 1;
    public  static final int TYPE_TWO = 2;
    public  static final int TYPE_THREE = 3;

    protected int type;
    protected int avaterColor;
    protected int contentColor;
    protected String name;
    protected String content;

    public String getContent() {
        return content;
    }

    public void setContent(String content) {
        this.content = content;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getContentColor() {
        return contentColor;
    }

    public void setContentColor(int contentColor) {
        this.contentColor = contentColor;
    }

    public int getAvaterColor() {
        return avaterColor;
    }

    public void setAvaterColor(int avaterColor) {
        this.avaterColor = avaterColor;
    }

    public int getType() {
        return type;
    }

    public void setType(int type) {
        this.type = type;
    }

    public static int getTypeThree() {
        return TYPE_THREE;
    }

    public static int getTypeTwo() {
        return TYPE_TWO;
    }
    public static int getTypeOne() {
        return TYPE_ONE;
    }
}

RecycleView的适配器

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

    private LayoutInflater mLayoutInflater;

    private List<Person> mList = new ArrayList<>();

    private Context mContext;

    public MyAdapter(Context mContext) {
        this.mContext = mContext;
        mLayoutInflater = LayoutInflater.from(mContext);
    }

    //使用此方法从获取数据
    public void addList(List<Person> list){
        mList.addAll(list);
    }

    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        //根据不同的viewType，创建并返回影响的ViewHolder
        switch (viewType){
            case Person.TYPE_ONE:
                return new TypeOneHolder(mLayoutInflater.inflate(R.layout.item_type_one,parent,false));
            case Person.TYPE_TWO:
                return new TypeTwoHolder(mLayoutInflater.inflate(R.layout.item_type_two,parent,false));
            case Person.TYPE_THREE:
                return new TypeThreeHolder(mLayoutInflater.inflate(R.layout.item_type_three,parent,false));
        }
        return null;
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
        //抽象出TypeAbstartViewHolder，所以在进行绑定的时候可以直接调用
        ((TypeAbstartViewHolder)holder).bindHolder(mList.get(position));
    }

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

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

关键的一点，TypeAbstartViewHolder 抽象出bindHolder方法，优雅实现加载不同item布局，代码如下：

public abstract class TypeAbstartViewHolder extends RecyclerView.ViewHolder {
    public TypeAbstartViewHolder(View itemView) {
        super(itemView);
    }
    public abstract void bindHolder(Person person);
}

继承自上面抽象的方法，实现加载不同item布局TypeOneHolder:

public class TypeOneHolder extends TypeAbstartViewHolder {
    private ImageView avater;
    private TextView name;

    public TypeOneHolder(View itemView) {
        super(itemView);
        avater = (ImageView) itemView.findViewById(R.id.avater);
        name = (TextView) itemView.findViewById(R.id.name);
    }
    //为ViewHolder绑定数据
    @Override
    public void bindHolder(Person person) {
        avater.setBackgroundResource(person.getAvaterColor());
        name.setText(person.getName());
    }
}

TypeTwoHolde代码如下：

public class TypeTwoHolder extends TypeAbstartViewHolder {
    private ImageView avater;
    private TextView name;
    private TextView content;

    public TypeTwoHolder(View itemView) {
        super(itemView);
        avater = (ImageView) itemView.findViewById(R.id.avater);
        name = (TextView) itemView.findViewById(R.id.name);
        content = (TextView) itemView.findViewById(R.id.content);
    }


    //为ViewHolder绑定数据
    @Override
    public void bindHolder(Person person) {
        avater.setBackgroundResource(person.getAvaterColor());
        name.setText(person.getName());
        content.setText(person.getContent());
    }
}

TypeThreeHolder的代码如下：

public class TypeThreeHolder extends TypeAbstartViewHolder {
    private ImageView avater;
    private TextView name;
    private TextView content;
    private ImageView iv;

    public TypeThreeHolder(View itemView) {
        super(itemView);
        avater = (ImageView) itemView.findViewById(R.id.avater);
        name = (TextView) itemView.findViewById(R.id.name);
        content = (TextView) itemView.findViewById(R.id.content);
        iv = (ImageView) itemView.findViewById(R.id.content_color);
    }

    //为ViewHolder绑定数据
    @Override
    public void bindHolder(Person person) {
        avater.setBackgroundResource(person.getAvaterColor());
        name.setText(person.getName());
        content.setText(person.getContent());
        iv.setBackgroundResource(person.getAvaterColor());
    }
}

xml文件代码部分：只放出了item_type_three部分的代码：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:background="@android:color/white"
    android:layout_width="match_parent"
    android:gravity="center_vertical"
    android:layout_height="60dp">

    <ImageView
        android:id="@+id/avater"
        android:layout_marginLeft="4dp"
        android:layout_width="40dp"
        android:layout_height="40dp"/>

    <LinearLayout
        android:layout_toRightOf="@id/avater"
        android:layout_marginLeft="5dp"
        android:orientation="vertical"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">

        <TextView
            android:id="@+id/name"
            android:text="type_one_textview"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>

        <TextView
            android:id="@+id/content"
            android:layout_marginTop="5dp"
            android:text="type_one_textview"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>
    </LinearLayout>

    <ImageView
        android:layout_alignParentRight="true"
        android:layout_marginRight="10dp"
        android:id="@+id/content_color"
        android:layout_width="100dp"
        android:layout_height="40dp"/>
</RelativeLayout>

通过recycleView实现两个不同布局混搭，只需要修改mainActivity如下：

public class MainActivity extends AppCompatActivity {

    private RecyclerView mRecyclerView;
    private MyAdapter mMyAdapter;


    private int colors[] = {android.R.color.holo_blue_bright, android.R.color.black, android.R.color.holo_red_dark};

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

    private void initView() {
        mRecyclerView = (RecyclerView) findViewById(R.id.id_recyclerView);

        //构造参数里面的2表示的是一行有两列
        final GridLayoutManager manager = new GridLayoutManager(this, 2);
        mRecyclerView.setLayoutManager(manager);
        manager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
            @Override
            public int getSpanSize(int position) {
                int type = mRecyclerView.getAdapter().getItemViewType(position);
                //若是TYPE_THREE，占用两列，否则占用一列
                if (type == Person.TYPE_THREE) {
                    return manager.getSpanCount();
                } else {
                    return 1;
                }
            }
        });
        mMyAdapter = new MyAdapter(this);

        //给布局里的子view添加边距
        mRecyclerView.addItemDecoration(new RecyclerView.ItemDecoration() {
            @Override
            public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
                GridLayoutManager.LayoutParams layoutParams = (GridLayoutManager.LayoutParams) view.getLayoutParams();
                int spanSize = layoutParams.getSpanSize();
                int spanIndex = layoutParams.getSpanIndex();
                outRect.top = 20;
                if (spanSize != manager.getSpanCount()) {
                    if (spanIndex == 0) {
                        outRect.right = 0;
                    } else {
                        outRect.right = 10;
                    }
                }
            }
        });
        mRecyclerView.setAdapter(mMyAdapter);


    }

    private void initData() {
        List<Person> list = new ArrayList<>();
        for (int i = 0; i < 20; i++) {
            Person p = new Person();
            int type = (int) (Math.random() * 3 + 1);
            p.type = type;
            p.content = "content" + 1;
            p.avaterColor = colors[type - 1];
            p.name = "name" + i;
            list.add(p);
        }
        mMyAdapter.addList(list);
        mMyAdapter.notifyDataSetChanged();
    }
}

效果如图：

 

两种布局.png