用RecyclerView实现水平滚动和网格视图
作者：互联网
建立RecyclerViewActivity.java文件
1 public class RecyclerViewActivity extends AppCompatActivity {
2 private Button BtnLinear;
3 private Button BtnShuiping;
4 private Button BtnGrid;
5 @Override
6 protected void onCreate(Bundle savedInstanceState) {
7 super.onCreate(savedInstanceState);
8 setContentView(R.layout.activity_recycler_view);//遇到R标红问题时import class就好了
9 BtnLinear=findViewById(R.id.btn_linear);
10 BtnShuiping=findViewById(R.id.btn_shuiping);
11 BtnGrid=findViewById(R.id.btn_grid);
12 BtnLinear.setOnClickListener(new View.OnClickListener() {
13 @Override
14 public void onClick(View view) {
15 Intent intent=new Intent(RecyclerViewActivity.this,LinearRecyclerViewActivity.class);
16 startActivity(intent);
17 }
18 });
19 BtnShuiping.setOnClickListener(new View.OnClickListener() {
20 @Override
21 public void onClick(View view) {
22 Intent intent=new Intent(RecyclerViewActivity.this,ShuipRecyclerViewActivity.class);
23 startActivity(intent);
24 }
25 });
26 BtnGrid.setOnClickListener(new View.OnClickListener() {
27 @Override
28 public void onClick(View view) {
29 Intent intent=new Intent(RecyclerViewActivity.this,GridRecyclerViewActivity.class);
30 startActivity(intent);
31 }
32 });
33 }
34 }
对应的activity_recycler_view.xml文件：
1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 2 android:layout_width="match_parent" 3 android:layout_height="wrap_content" 4 android:orientation="vertical"> 5 6 <Button 7 android:id="@+id/btn_linear" 8 android:layout_width="match_parent" 9 android:layout_height="wrap_content" 10 android:text="列表视图"> 11 </Button> 12 13 <Button 14 android:id="@+id/btn_shuiping" 15 android:layout_width="match_parent" 16 android:layout_height="wrap_content" 17 android:text="水平滚动"/> 18 19 <Button 20 android:id="@+id/btn_grid" 21 android:layout_width="match_parent" 22 android:layout_height="wrap_content" 23 android:text="网格视图"> 24 </Button> 25 26 27 </LinearLayout>
实现水平滚动：
建立ShuipRecyclerViewActivity.java文件：
1 public class ShuipRecyclerViewActivity extends AppCompatActivity {
2 private RecyclerView RVshuip;
3 @Override
4 protected void onCreate(Bundle savedInstanceState) {
5 super.onCreate(savedInstanceState);
6 setContentView(R.layout.activity_shuip_recycler_view);
7 RVshuip=findViewById(R.id.rv_shuip);
8 LinearLayoutManager linearLayoutManager=new LinearLayoutManager(ShuipRecyclerViewActivity.this);
9 linearLayoutManager.setOrientation(LinearLayoutManager.HORIZONTAL);//注意linearLayoutManager的开头大小写，注意区分
10 RVshuip.setLayoutManager(linearLayoutManager);
11 RVshuip.addItemDecoration(new MyDecoration());
12 RVshuip.setAdapter(new ShuipAdapter(ShuipRecyclerViewActivity.this, new ShuipAdapter.OnItemClickListener() {
13 @Override
14 public void onClick(int pos) {
15 Toast.makeText(ShuipRecyclerViewActivity.this, "点击"+pos, Toast.LENGTH_SHORT).show();
16 }
17 }));
18 }
19
20 class MyDecoration extends RecyclerView.ItemDecoration {
21 @Override
22 public void getItemOffsets(@NonNull Rect outRect, @NonNull View view, @NonNull RecyclerView parent, @NonNull RecyclerView.State state) {
23 super.getItemOffsets(outRect, view, parent, state);
24 outRect.set(getResources().getDimensionPixelOffset(R.dimen.deviderHeight), 0, 0, 0);
25 }//给列表视图在左面设置分隔线,记得在上面添加RVshuip.setLayoutManager(linearLayoutManager);这句话
26 }
27 }
对应的activity_shuip_recycler_view.xml文件：
1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 2 android:layout_width="match_parent" 3 android:layout_height="match_parent"> 4 5 <androidx.recyclerview.widget.RecyclerView 6 android:id="@+id/rv_shuip" 7 android:layout_width="match_parent" 8 android:layout_height="wrap_content" 9 android:background="@color/greydrak"/> 10 </LinearLayout>
建立适配器ShuipAdapter.java文件：
1 public class ShuipAdapter extends RecyclerView.Adapter<ShuipAdapter.LinearViewHolder>{
2 private Context mcontext;
3 private OnItemClickListener mlistener;
4 public ShuipAdapter(Context context, OnItemClickListener listener){
5 this.mcontext=context;
6 this.mlistener=listener;
7 }
8 @NonNull
9 @Override
10 public ShuipAdapter.LinearViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
11 return new LinearViewHolder(LayoutInflater.from(mcontext).inflate(R.layout.layout_shuip_item,parent,false));
12 }//这里原来是RecyclerView.ViewHolder，建立完LinearViewHolder class后要把它改成LinearAdapter.LinearViewHolder就可以了
13
14 @Override
15 public void onBindViewHolder(@NonNull ShuipAdapter.LinearViewHolder holder, int position) {
16 holder.textView.setText("大家好");
17 holder.itemView.setOnClickListener(new View.OnClickListener() {
18 @Override
19 public void onClick(View view) {
20 //Toast.makeText(mcontext, "click...", Toast.LENGTH_SHORT).show();//第一种方法
21 mlistener.onClick(position);//第二种方法，
22 }
23 });//增加点击事件，这是第一种方法
24 }//这里原来是RecyclerView.ViewHolder，建立完LinearViewHolder class后要把它改成LinearAdapter.LinearViewHolder就可以了
25
26 @Override
27 public int getItemCount() {
28 return 20;
29 }//设置有多少行
30
31 class LinearViewHolder extends RecyclerView.ViewHolder {
32 private TextView textView;
33 public LinearViewHolder(@NonNull View itemView) {
34 super(itemView);
35 textView=itemView.findViewById(R.id.tv_rtitle);
36 }
37 }
38 public interface OnItemClickListener{
39 void onClick(int pos);
40 }//点击事件的第二种方法，建立接口
41 }
最后是单个元素样式layout_shuip_item.xml文件：
1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 2 android:layout_width="wrap_content" 3 android:layout_height="wrap_content" 4 android:orientation="vertical" 5 android:background="@color/white" 6 android:padding="10dp"> 7 8 <TextView 9 android:id="@+id/tv_rtitle" 10 android:layout_width="wrap_content" 11 android:layout_height="50dp" 12 android:gravity="center" 13 android:textColor="@color/black" 14 android:textSize="20sp"/> 15 </LinearLayout>
实现网格视图：
建立GridRecyclerViewActivity.java文件：
1 public class GridRecyclerViewActivity extends AppCompatActivity {
2 private RecyclerView RVgrid;
3 @Override
4 protected void onCreate(Bundle savedInstanceState) {
5 super.onCreate(savedInstanceState);
6 setContentView(R.layout.activity_grid_recycler_view);
7 RVgrid=findViewById(R.id.rv_grid);
8 RVgrid.setLayoutManager(new GridLayoutManager(GridRecyclerViewActivity.this,3));//3是几列的意思
9 RVgrid.setAdapter(new GridAdapter(GridRecyclerViewActivity.this, new GridAdapter.OnItemClickListener() {
10 @Override
11 public void onClick(int pos) {
12 Toast.makeText(GridRecyclerViewActivity.this, "又点击了"+pos, Toast.LENGTH_SHORT).show();
13 }
14 }));
15 }
16 }
对应的activity_grid_recycler_view.xml文件:
1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 2 android:layout_width="match_parent" 3 android:layout_height="match_parent"> 4 <androidx.recyclerview.widget.RecyclerView 5 android:id="@+id/rv_grid" 6 android:layout_width="match_parent" 7 android:layout_height="wrap_content"/> 8 </LinearLayout>
建立适配器GridAdapter.java文件：
1 public class GridAdapter extends RecyclerView.Adapter<GridAdapter.LinearViewHolder>{
2 private Context mcontext;
3 private OnItemClickListener mlistener;
4 public GridAdapter(Context context, OnItemClickListener listener){
5 this.mcontext=context;
6 this.mlistener=listener;
7 }
8 @NonNull
9 @Override
10 public GridAdapter.LinearViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
11 return new LinearViewHolder(LayoutInflater.from(mcontext).inflate(R.layout.layout_grid_recyclerview_item,parent,false));
12 }//这里原来是RecyclerView.ViewHolder，建立完LinearViewHolder class后要把它改成LinearAdapter.LinearViewHolder就可以了
13
14 @Override
15 public void onBindViewHolder(@NonNull GridAdapter.LinearViewHolder holder, int position) {
16 holder.textView.setText("这是啥？！");
17 holder.itemView.setOnClickListener(new View.OnClickListener() {
18 @Override
19 public void onClick(View view) {
20 //Toast.makeText(mcontext, "click...", Toast.LENGTH_SHORT).show();//第一种方法
21 mlistener.onClick(position);//第二种方法，
22 }
23 });//增加点击事件，这是第一种方法
24 }//这里原来是RecyclerView.ViewHolder，建立完LinearViewHolder class后要把它改成LinearAdapter.LinearViewHolder就可以了
25
26 @Override
27 public int getItemCount() {
28 return 21;
29 }//设置有多少个
30
31 class LinearViewHolder extends RecyclerView.ViewHolder {
32 private TextView textView;
33 public LinearViewHolder(@NonNull View itemView) {
34 super(itemView);
35 textView=itemView.findViewById(R.id.tv_rtitle);
36 }
37 }
38 public interface OnItemClickListener{
39 void onClick(int pos);
40 }//点击事件的第二种方法，建立接口
41 }
最后是单个元素样式layout_grid_recyclerview_item.xml文件：
1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 2 android:layout_width="wrap_content" 3 android:layout_height="wrap_content" 4 android:orientation="vertical" 5 android:background="@color/white" 6 android:padding="10dp"> 7 8 <TextView 9 android:id="@+id/tv_rtitle" 10 android:layout_width="wrap_content" 11 android:layout_height="50dp" 12 android:gravity="center" 13 android:textColor="@color/black" 14 android:textSize="20sp"/> 15 </LinearLayout>
标签：void,网格,视图,class,LinearViewHolder,Override,new,RecyclerView,public 来源： https://www.cnblogs.com/konglong-cm/p/15856925.html