Android RecyclerView实现加载多种条目类型

今天咱们是用RecyclerView来实现这个多种Item的加载.
其实最关键的是要复写RecyclerView的Adapter中的getItemViewType()方法这个方法就根据条件返回条目的类型这个MoreTypeBean 是用来传数据的没必要跟我写的一样,
其实就是从activity中传到adapter中的数据中必须要有一个type字段来判断这个item对象需要那种视图,然后return出一个标记,在onCreateViewHolder中在引用所对应的item布局.

//重写getItemViewType方法 根据条件返回条目的类型
    @Override
    public int getItemViewType(int position) {        MoreTypeBean moreTypeBean = mData.get(position);
        if (moreTypeBean.type == 0) {
            return TYPE_PULL_IMAGE;
        } else if (moreTypeBean.type == 1) {
            return TYPE_RIGHT_IMAGE;
        } else {
            return TYPE_THREE_IMAGE;
        }
    }

一般有多少种类型我们定义多少种常量.(我今天写了三种布局所以我定义了三个)

  //定义三种常量  表示三种条目类型
    public static final int TYPE_PULL_IMAGE = 0;
    public static final int TYPE_RIGHT_IMAGE = 1;
    public static final int TYPE_THREE_IMAGE = 2;

有了上面定义的常量之后在onCreateViewHolder里根据viewtype来判断所引用的item布局类型这样每一条item就会不一样了

    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        //创建不同的 ViewHolder
        View view;
        //根据viewtype来判断        if (viewType == TYPE_PULL_IMAGE) {
            view =View.inflate(parent.getContext(),R.layout.item_pull_img,null);
            return new PullImageHolder(view);
        } else if (viewType == TYPE_RIGHT_IMAGE) {
            view =View.inflate(parent.getContext(),R.layout.item_right_img,null);
            return new RightImageHolder(view);
        } else {
            view =View.inflate(parent.getContext(),R.layout.item_three_img,null);
            return new ThreeImageHolder(view);
        }
    }

创建三种不同的ViewHolder


    private class PullImageHolder extends RecyclerView.ViewHolder {        public PullImageHolder(View itemView) {
            super(itemView);
        }
    }    private class RightImageHolder extends RecyclerView.ViewHolder {        public RightImageHolder(View itemView) {
            super(itemView);
        }
    }    private class ThreeImageHolder extends RecyclerView.ViewHolder {        public ThreeImageHolder(View itemView) {
            super(itemView);
        }
    }

下面把所有的代码都给大家:
Activity中的代码

public class Recycler_variety_Activity extends Activity {    private int[] icons = {R.drawable.test, R.drawable.test1, R.drawable.test2, R.drawable.test3, R.drawable.test4, R.drawable.test5, R.drawable.test6};
    private RecyclerView mRecy;
    private List<MoreTypeBean> mData;    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.recycler_variety_activity);
        initView();
        initData();
        initViewOper();
    }    private void initView() {
        mRecy = (RecyclerView) findViewById(R.id.act_recycler_variety_recycler);
    }    private void initData() {
        mData = new ArrayList<>();
//        随机数 用来标记item界面的类型
        Random random = new Random();        for (int i = 0; i < icons.length; i++) {
            MoreTypeBean more = new MoreTypeBean();            more.pic = icons[i];
            more.type = random.nextInt(3);
            mData.add(more);
        }
    }    private void initViewOper() {
        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
        mRecy.setLayoutManager(linearLayoutManager);
        Recycler_variety_Adapter adapter = new Recycler_variety_Adapter(mData);
        mRecy.setAdapter(adapter);
    }}

recyclerview_test_layout的布局就是只有一个RecyclerView

   <android.support.v7.widget.RecyclerView
        android:id="@+id/act_recycler_variety_recycler"
        android:layout_width="match_parent"
        android:background="#d3d3d3"
        android:layout_height="match_parent"/>

RecyclerView的Adapter

public class Recycler_variety_Adapter extends RecyclerView.Adapter {    //定义三种常量  表示三种条目类型
    public static final int TYPE_PULL_IMAGE = 0;
    public static final int TYPE_RIGHT_IMAGE = 1;
    public static final int TYPE_THREE_IMAGE = 2;
    private List<MoreTypeBean> mData;    public Recycler_variety_Adapter(List<MoreTypeBean> data) {
        this.mData = data;
    }    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        //创建不同的 ViewHolder
        View view;
        //根据viewtype来创建条目        if (viewType == TYPE_PULL_IMAGE) {
            view =View.inflate(parent.getContext(),R.layout.item_pull_img,null);
            return new PullImageHolder(view);
        } else if (viewType == TYPE_RIGHT_IMAGE) {
            view =View.inflate(parent.getContext(),R.layout.item_right_img,null);
            return new RightImageHolder(view);
        } else {
            view =View.inflate(parent.getContext(),R.layout.item_three_img,null);
            return new ThreeImageHolder(view);
        }
    }    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {    }    @Override
    public int getItemCount() {
        if (mData != null) {
            return mData.size();
        }
        return 0;
    }    //根据条件返回条目的类型
    @Override
    public int getItemViewType(int position) {        MoreTypeBean moreTypeBean = mData.get(position);
        if (moreTypeBean.type == 0) {
            return TYPE_PULL_IMAGE;
        } else if (moreTypeBean.type == 1) {
            return TYPE_RIGHT_IMAGE;
        } else {
            return TYPE_THREE_IMAGE;
        }    }    /**
     * 创建三种ViewHolder
     */
    private class PullImageHolder extends RecyclerView.ViewHolder {        public PullImageHolder(View itemView) {
            super(itemView);
        }
    }    private class RightImageHolder extends RecyclerView.ViewHolder {        public RightImageHolder(View itemView) {
            super(itemView);
        }
    }    private class ThreeImageHolder extends RecyclerView.ViewHolder {        public ThreeImageHolder(View itemView) {
            super(itemView);
        }
    }
}

item_pull_img布局

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"    >
    <LinearLayout
        android:layout_width="match_parent"
        android:padding="7dp"
        android:background="#fff"
        android:orientation="vertical"
        android:layout_height="wrap_content">
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textColor="#000"
        android:text="多种条目类型,多种条目类型,多种条目类型,多种条目类型,多种条目类型"
        android:textSize="16sp"
        />
    <ImageView
        android:layout_width="match_parent"
        android:layout_height="150dp"
        android:background="@drawable/sucai6"
        android:scaleType="fitXY"
        />
    </LinearLayout>
    <View
        android:layout_marginTop="3dp"
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:background="#d3d3d3"
        />
</LinearLayout>

item_right_img布局

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="100dp"
    android:orientation="vertical"    >    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="#fff"
        android:orientation="horizontal"
        android:padding="7dp">        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="多种条目类型,多种条目类型,多种条目类型,多种条目类型,多种条目类型,多种条目类型,多种条目类型,多种条目类型"
            android:textColor="#000"
            android:textSize="16sp" />        <ImageView
            android:layout_width="120dp"
            android:layout_height="90dp"
            android:background="@drawable/sucai" />
    </LinearLayout>
    <View
        android:layout_marginTop="3dp"
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:background="#d3d3d3"
        />
</LinearLayout>

item_three_img布局

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    >    <LinearLayout
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:background="#fff"
        android:padding="7sp"
        android:layout_height="wrap_content">
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="多种条目类型,多种条目类型,多种条目类型,多种条目类型,多种条目类型,多种条目类型多种条目类型"
        android:textColor="#000"
        android:textSize="16sp" />    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">        <ImageView
            android:layout_width="0dp"
            android:layout_height="80dp"
            android:layout_weight="1"
            android:scaleType="fitXY"            android:src="@drawable/sucai3" />
        <View
            android:layout_width="6dp"
            android:layout_height="0dp"/>        <ImageView
            android:layout_width="0dp"
            android:layout_height="80dp"
            android:layout_weight="1"
            android:scaleType="fitXY"
            android:src="@drawable/sucai4" />
        <View
            android:layout_width="6dp"
            android:layout_height="0dp"/>
        <ImageView
            android:layout_width="0dp"
            android:layout_height="80dp"
            android:layout_weight="1"
            android:scaleType="fitXY"
            android:src="@drawable/sucai5" />    </LinearLayout></LinearLayout>
    <View
        android:layout_marginTop="3dp"
        android:background="#d3d3d3"
        android:layout_width="match_parent"
        android:layout_height="1dp"/>
</LinearLayout>

MoreTypeBean

public class MoreTypeBean {
    public int type;
    public int pic;
}

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