Android实现ListView显示信息，点击每个item，跳转到相应界面

1. 在layout文件夹中创建一个新的xml文件，命名为list_item.xml，用于定义ListView中每个item的布局。

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="10dp">

    <TextView
        android:id="@+id/item_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="18sp"
        android:textColor="#000000"
        android:textStyle="bold"
        android:layout_alignParentTop="true"
        android:layout_alignParentStart="true"
        android:text="Item Title"/>

    <TextView
        android:id="@+id/item_description"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="14sp"
        android:textColor="#666666"
        android:layout_below="@id/item_title"
        android:layout_alignStart="@id/item_title"
        android:text="Item Description"/>

</RelativeLayout>

2. 在Activity中，定义ListView和数据源。

public class MainActivity extends AppCompatActivity {

    private ListView listView;
    private List<Item> itemList;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // 初始化数据源
        itemList = new ArrayList<>();
        itemList.add(new Item("Item 1", "This is item 1"));
        itemList.add(new Item("Item 2", "This is item 2"));
        itemList.add(new Item("Item 3", "This is item 3"));
        itemList.add(new Item("Item 4", "This is item 4"));
        itemList.add(new Item("Item 5", "This is item 5"));

        // 初始化ListView
        listView = findViewById(R.id.list_view);
        ItemAdapter adapter = new ItemAdapter(MainActivity.this, R.layout.list_item, itemList);
        listView.setAdapter(adapter);

        // 设置item的点击事件
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Item item = itemList.get(position);
                Intent intent = new Intent(MainActivity.this, ItemActivity.class);
                intent.putExtra("title", item.getTitle());
                intent.putExtra("description", item.getDescription());
                startActivity(intent);
            }
        });
    }
}

3. 编写Adapter，用于将数据源中的数据填充到ListView的每个item中。

public class ItemAdapter extends ArrayAdapter<Item> {

    private int resourceId;

    public ItemAdapter(Context context, int resourceId, List<Item> itemList) {
        super(context, resourceId, itemList);
        this.resourceId = resourceId;
    }

    @NonNull
    @Override
    public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
        Item item = getItem(position);
        View view;
        ViewHolder viewHolder;
        if (convertView == null) {
            view = LayoutInflater.from(getContext()).inflate(resourceId, parent, false);
            viewHolder = new ViewHolder();
            viewHolder.titleTextView = view.findViewById(R.id.item_title);
            viewHolder.descriptionTextView = view.findViewById(R.id.item_description);
            view.setTag(viewHolder);
        } else {
            view = convertView;
            viewHolder = (ViewHolder) view.getTag();
        }
        viewHolder.titleTextView.setText(item.getTitle());
        viewHolder.descriptionTextView.setText(item.getDescription());
        return view;
    }

    private static class ViewHolder {
        TextView titleTextView;
        TextView descriptionTextView;
    }
}

4. 创建一个新的Activity，用于展示每个item对应的详细信息。

public class ItemActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_item);

        // 获取传递过来的数据
        Intent intent = getIntent();
        String title = intent.getStringExtra("title");
        String description = intent.getStringExtra("description");

        // 设置标题和描述
        TextView titleTextView = findViewById(R.id.item_title);
        TextView descriptionTextView = findViewById(R.id.item_description);
        titleTextView.setText(title);
        descriptionTextView.setText(description);
    }
}

5. 在AndroidManifest.xml中注册新创建的Activity。

<activity android:name=".ItemActivity"></activity>

6. 运行程序，在MainActivity中点击每个item，可以跳转到相应的ItemActivity界面。