java 如何在安卓的 RecyclerView 中添加子弹列表？

如何在安卓的 RecyclerView 中添加子弹列表？

原文:https://www . geeksforgeeks . org/如何添加项目符号列表在安卓中循环查看/

回收器视图允许我们显示一个项目列表，但是要将我们的列表转换成项目符号列表，我们必须做一些额外的工作。您可以按照下面给出的简单步骤来完成这项任务

在依赖项部分的回收视图中，在 build.gradle 文件中添加支持库。

java <dependency> implementation 'androidx.recyclerview:recyclerview:1.1.0' </dependency>
在可绘制文件夹中创建 bullet.xml 文件。

java <?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="oval"> <padding android:left="8dp" android:right="8dp"/> <size android:width="6dp" android:height="6dp"/> <solid android:color="#219806"/> </shape>
在 activity_main.xml 中，添加以下代码。

```java <?xml version="1.0" encoding="utf-8"?>

androidx.recyclerview.widget.RecyclerView android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/recycler_view" /

```
使用以下代码创建一个新的 custom_layout.xml 文件。

java <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:id="@+id/show_name_layout" android:layout_height="wrap_content" android:orientation="horizontal" android:layout_margin="5dp" > <TextView android:drawableLeft="@drawable/bullet" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <TextView android:layout_marginStart="2dp" android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/textView" android:textSize="20sp" /> </LinearLayout>
创建一个MyAdapter.java类，并添加以下代码。

```java public class MyAdapter     extends RecyclerView.Adapter {

String text[];     Activity activity;

public MyAdapter(Activity activity,                      String text[])     {         this.activity = activity;         this.text = text;     }

// This method is used to attach     // custom layout to the recycler view     @NonNull     @Override     public MyViewHolder onCreateViewHolder(         @NonNull ViewGroup parent,         int viewType)     {

View view             = activity.getLayoutInflater()                   .inflate(                       R.layout.custom_layout,                       parent, false);         return new MyViewHolder(view);     }

// This method is used to set the action     // to the widgets of our custom layout.     @Override     public void onBindViewHolder(         @NonNull MyViewHolder holder,         int position)     {         holder.textView.setText(text[position]);     }

@Override     public int getItemCount()     {         return text.length;     }

class MyViewHolder extends RecyclerView.ViewHolder {         TextView textView;         public MyViewHolder(@NonNull View itemView)         {             super(itemView);             textView = itemView.findViewById(R.id.textView);         }     } } ```
最后，在MainActivity.java中添加以下代码。

```java public class MainActivity     extends AppCompatActivity {

RecyclerView recyclerView;     String text[]         = { "Linear Search", "Binary Search", "Selection Sort",             "Bubble Sort", "Insertion Sort",             "Recursive Insertion Sort", "Merge Sort",             "Iterative Merge Sort", "Quick Sort",             "Heap Sort", "Counting Sort",             "Klee’s Algorithm", "Karatsuba algorithm",             "Dijkastra’s Shortest Path Algorithm",             "Dial’s Algorithm",             "Kruskal’s Minimum Spanning Tree",             "Prim’s Minimum Spanning Tree",             "Naive Pattern Searching",             "KMP Algorithm", "Rabin-Karp Algorithm" };

@Override     protected void onCreate(Bundle savedInstanceState)     {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);         recyclerView = findViewById(R.id.recycler_view);

MyAdapter adapter = new MyAdapter(this, text);         recyclerView.setLayoutManager(             new LinearLayoutManager(this));         recyclerView.setAdapter(adapter);     } } ```