Android RecyclerView的使用（四）——点击事件

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Android RecyclerView的使用（四）——点击事件

前言： RecyclerView提供了一种插拔式的体验，高度的解耦，异常的灵活，通过设置它提供的不同LayoutManager，ItemDecoration , ItemAnimator实现绚丽的效果。

通过布局管理器LayoutManager，可以控制其显示的方式；
通过ItemDecoration，可以控制Item间的间隔（可定制）；
通过ItemAnimator，可以控制Item增删的动画；
至于点击、长按事件，RecyclerView并没有给我们提供相应的方法接口，需要我们自己实现。

上一节我们了解了如何通过RecyclerView 实现瀑布流，本节我们将学习如何为我们的Item添加点击事件。

效果图：

这里写图片描述

1、布局文件

<?xml version="1.0" encoding="utf-8"?><android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent">    <android.support.v7.widget.RecyclerView        android:id="@+id/recyclerView"        android:layout_width="match_parent"        android:layout_height="match_parent"/></android.support.constraint.ConstraintLayout>

2、定义item的样式

<?xml version="1.0" encoding="utf-8"?><LinearLayout    xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:background="@drawable/item_bg"    android:layout_margin="3dp"    android:layout_height="72dp">    <ImageView        android:id="@+id/imageView"        android:layout_margin="20dp"        android:layout_width="wrap_content"        android:layout_height="wrap_content" />    <TextView        android:id="@+id/textView"        android:layout_gravity="center_vertical"        android:layout_width="wrap_content"        android:layout_height="wrap_content" /></LinearLayout>

3、自定义的Adapter适配器，添加item click接口，设置item的点击事件。

public class MyAdapter extends RecyclerView.Adapter<MyViewHolder> {    private LayoutInflater mInflater;    private Context mContext;    private List<String> mDatas;    private int[] imgIds;    private OnItemClickListener mOnItemClickListener;    public MyAdapter(Context context, List<String> datas, int[] imgIds) {        this.mContext = context;        this.mDatas = datas;        this.imgIds = imgIds;        mInflater = LayoutInflater.from(context);    }    @Override    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {        View view = mInflater.inflate(R.layout.item_single_textview, parent, false);        MyViewHolder viewHolder = new MyViewHolder(view);        return viewHolder;    }    @Override    public void onBindViewHolder(final MyViewHolder holder, final int position) {        holder.textView.setText(mDatas.get(position));        holder.imageView.setBackgroundResource(imgIds[ position % imgIds.length]);        // item click        if (mOnItemClickListener != null) {            holder.itemView.setOnClickListener(new View.OnClickListener() {                @Override                public void onClick(View view) {                    mOnItemClickListener.onItemClick(holder.itemView, position);                }            });        }        // item long click        holder.itemView.setOnLongClickListener(new View.OnLongClickListener() {            @Override            public boolean onLongClick(View view) {                mOnItemClickListener.onItemLongClick(holder.itemView, position);                return true;            }        });    }    @Override    public int getItemCount() {        return mDatas.size();    }    public void setOnItemClickListener(OnItemClickListener listener) {        this.mOnItemClickListener = listener;    }    public void addData(int pos) {        mDatas.add(pos, "Add one");        notifyItemInserted(pos);    }    public void deleteData(int pos) {        mDatas.remove(pos);        notifyItemRemoved(pos);    }    public interface OnItemClickListener {        void onItemClick(View view, int position);        void onItemLongClick(View view, int position);    }}class MyViewHolder extends RecyclerView.ViewHolder {    ImageView imageView;    TextView textView;    public MyViewHolder(View itemView) {        super(itemView);        textView = itemView.findViewById(R.id.textView);        imageView = itemView.findViewById(R.id.imageView);    }}

4、MainActivity.java

public class MainActivity extends AppCompatActivity {    private RecyclerView recyclerView;    private List<String> mDatas;    private int[] imgIds;    private MyAdapter mAdapter;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initDatas();        recyclerView = (RecyclerView) findViewById(R.id.recyclerView);        mAdapter = new MyAdapter(this, mDatas, imgIds);        recyclerView.setAdapter(mAdapter);        //设置RecyclerView的布局管理        LinearLayoutManager manager = new LinearLayoutManager(this,                LinearLayoutManager.VERTICAL, false);        recyclerView.setLayoutManager(manager);        recyclerView.setItemAnimator(new DefaultItemAnimator());        mAdapter.setOnItemClickListener(new MyAdapter.OnItemClickListener() {            @Override            public void onItemClick(View view, int position) {                Toast.makeText(MainActivity.this, "clicked " + position,                        Toast.LENGTH_SHORT).show();            }            @Override            public void onItemLongClick(View view, int position) {                Toast.makeText(MainActivity.this, "long clicked " + position,                        Toast.LENGTH_SHORT).show();            }        });    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        getMenuInflater().inflate(R.menu.menu, menu);        return true;    }    @Override    public boolean onOptionsItemSelected(MenuItem item) {        switch (item.getItemId()) {            case R.id.add:                mAdapter.addData(1);                break;            case R.id.delete:                mAdapter.deleteData(1);                break;            case R.id.listView:                recyclerView.setLayoutManager(new LinearLayoutManager(MainActivity.this));                break;            case R.id.gridView:                recyclerView.setLayoutManager(new GridLayoutManager(MainActivity.this, 2));                break;            case R.id.gridView_hor:                recyclerView.setLayoutManager(new StaggeredGridLayoutManager(5,                        StaggeredGridLayoutManager.HORIZONTAL));                break;            case R.id.staggered:                Intent intent = new Intent(this, StaggeredActivity.class);                startActivity(intent);                break;            default:                break;        }        return super.onOptionsItemSelected(item);    }    private void initDatas() {        imgIds = new int[]{R.mipmap.pic01, R.mipmap.pic02, R.mipmap.pic03, R.mipmap.pic04,                R.mipmap.pic05, R.mipmap.pic06, R.mipmap.pic07};        mDatas = new ArrayList<>();        mDatas.add("亳州");         mDatas.add("大娃");        mDatas.add("二娃");        mDatas.add("三娃");        mDatas.add("四娃");        mDatas.add("五娃");        mDatas.add("六娃");        mDatas.add("七娃");        mDatas.add("喜羊羊");        mDatas.add("美羊羊");        mDatas.add("懒羊羊");        mDatas.add("沸羊羊");        mDatas.add("暖羊羊");        mDatas.add("慢羊羊");        mDatas.add("灰太狼");        mDatas.add("红太狼");        mDatas.add("孙悟空");        mDatas.add("黑猫警长");        mDatas.add("舒克");        mDatas.add("贝塔");        mDatas.add("海尔");        mDatas.add("阿凡提");        mDatas.add("邋遢大王");        mDatas.add("哪吒");        mDatas.add("没头脑");        mDatas.add("不高兴");        mDatas.add("蓝皮鼠");        mDatas.add("大脸猫");        mDatas.add("大头儿子");        mDatas.add("小头爸爸");        mDatas.add("蓝猫");        mDatas.add("淘气");        mDatas.add("叶峰");        mDatas.add("楚天歌");        mDatas.add("江流儿");        mDatas.add("Tom");        mDatas.add("Jerry");        mDatas.add("12345");        mDatas.add("54321");        mDatas.add("_(:з」∠)_");        mDatas.add("……%￥#￥%#");    }}

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