通過一個demo記錄recyclerview的基礎用法，包括設置item間距，adapter內監聽點擊和接口回調監聽。
MyAdapter

package com.example.kw.recyclerviewtest;import android.content.Context; import android.support.annotation.NonNull; import android.support.v7.widget.RecyclerView; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.TextView; import android.widget.Toast;import java.util.List;public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {private Context mContext;private List<String> mData;private OnItemClickListener mListener;public MyAdapter(Context context, List<String> data, OnItemClickListener listener){this.mContext = context;this.mData = data;this.mListener = listener;}@NonNull@Overridepublic MyAdapter.MyViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {MyViewHolder myViewHolder = new MyViewHolder(LayoutInflater.from(mContext).inflate(R.layout.my_item, viewGroup, false)); // 傳入item布局return myViewHolder;}@Overridepublic void onBindViewHolder(@NonNull MyAdapter.MyViewHolder viewHolder, final int i) {viewHolder.textView.setText(mData.get(i));viewHolder.itemView.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {//Toast.makeText(mContext, "內部點擊", Toast.LENGTH_SHORT).show();mListener.onClick(i);}});}@Overridepublic int getItemCount() {return mData.size();}class MyViewHolder extends RecyclerView.ViewHolder {private TextView textView;public MyViewHolder(View itemView) {super(itemView);textView = itemView.findViewById(R.id.tv_item); // 通過布局找子控件,itemView是item布局，即my_item.xml的inflate}}// 外部接口回調監聽public interface OnItemClickListener {void onClick(int pos);} }

my_item.xml
這是單個item的布局，可以放置多個子控件，這里只放了一個TextView

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:orientation="vertical" android:layout_width="match_parent"android:layout_height="wrap_content"android:background="#FFFFFF"><TextViewandroid:id="@+id/tv_item"android:layout_width="match_parent"android:layout_height="50dp"android:gravity="center"android:textColor="#000"android:textSize="20sp"/></LinearLayout>

activity_linear_recyclerViewActivity
這個是recyclerview的布局

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:background="#FF353F47"><android.support.v7.widget.RecyclerViewandroid:id="@+id/rv_main"android:layout_width="match_parent"android:layout_height="wrap_content"></android.support.v7.widget.RecyclerView></LinearLayout>

dimens.xml
間距插件

<?xml version="1.0" encoding="utf-8"?> <resources><dimen name="dividerHeight">3dp</dimen> </resources>

使用recyclerview的活動

package com.example.kw.recyclerviewtest;import android.graphics.Rect; import android.support.annotation.NonNull; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.util.Log; import android.view.View; import android.widget.Toast;import java.util.ArrayList; import java.util.List;public class LinearRecyclerViewActivity extends AppCompatActivity {private RecyclerView mRvMain;private List<String > mData = new ArrayList<String>();private void initData() {mData.add("巴塞羅那");mData.add("皇家馬德里");mData.add("尤文圖斯");mData.add("拜仁慕尼黑");mData.add("曼城");mData.add("曼聯");mData.add("多特蒙德");mData.add("利物浦");mData.add("巴黎圣日耳曼");mData.add("沙爾克04");mData.add("勒沃庫森");mData.add("托特納姆熱刺");mData.add("那不勒斯");mData.add("國際米蘭");mData.add("AC米蘭");mData.add("馬德里競技");mData.add("切爾西");}@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_linear_recycler_view);initData();mRvMain = findViewById(R.id.rv_main);mRvMain.setLayoutManager(new LinearLayoutManager(LinearRecyclerViewActivity.this));mRvMain.addItemDecoration(new MyDecoration());mRvMain.setAdapter(new MyAdapter(LinearRecyclerViewActivity.this, mData, new MyAdapter.OnItemClickListener() {@Overridepublic void onClick(int pos) {Toast.makeText(LinearRecyclerViewActivity.this, "外部點擊 " + pos, Toast.LENGTH_SHORT).show();}}));}class MyDecoration extends RecyclerView.ItemDecoration {@Overridepublic void getItemOffsets(@NonNull Rect outRect, @NonNull View view, @NonNull RecyclerView parent, @NonNull RecyclerView.State state) {super.getItemOffsets(outRect, view, parent, state);outRect.set(0, 0, 0, getResources().getDimensionPixelOffset(R.dimen.dividerHeight)); // 1dp間隔下劃線}} }

總結

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