如何学习在Android Studio中基于SimpleAdapterActivity的线性布局

学习基于SimpleAdapterActivity的线性布局需要掌握以下步骤：

1. 在Android Studio中创建一个新的项目。
2. 在res/layout文件夹中创建一个新的XML布局文件，用于定义线性布局和列表视图。
3. 在MainActivity.java文件中创建一个SimpleAdapterActivity类，并在onCreate()方法中实例化SimpleAdapterActivity。
4. 在SimpleAdapterActivity类中，创建一个用于填充列表视图的SimpleAdapter对象，并将其设置为列表视图的适配器。
5. 在SimpleAdapterActivity类中，定义一个ArrayList对象，用于存储要显示的列表项数据。
6. 在SimpleAdapterActivity类的onCreate()方法中，将数据添加到ArrayList中。
7. 在SimpleAdapterActivity类的onCreate()方法中，使用SimpleAdapter对象将数据绑定到列表视图中。
8. 运行应用程序，查看结果并进行调试。

可以参考以下代码实现：

1. 创建一个新的XML布局文件，定义线性布局和列表视图。

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <ListView
        android:id="@+id/listView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

2. 在MainActivity.java文件中创建一个SimpleAdapterActivity类，并在onCreate()方法中实例化SimpleAdapterActivity。

public class MainActivity extends AppCompatActivity {

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

        SimpleAdapterActivity simpleAdapterActivity = new SimpleAdapterActivity();
    }
}

3. 在SimpleAdapterActivity类中，创建一个用于填充列表视图的SimpleAdapter对象，并将其设置为列表视图的适配器。

public class SimpleAdapterActivity {

    private ListView listView;

    public SimpleAdapterActivity() {
        listView = (ListView) findViewById(R.id.listView);

        SimpleAdapter adapter = new SimpleAdapter(
                this,
                getData(),
                R.layout.list_item,
                new String[] {"name", "age"},
                new int[] {R.id.name, R.id.age});

        listView.setAdapter(adapter);
    }

    private List<Map<String, Object>> getData() {
        List<Map<String, Object>> list = new ArrayList<>();

        Map<String, Object> map = new HashMap<>();
        map.put("name", "Alice");
        map.put("age", 20);
        list.add(map);

        map = new HashMap<>();
        map.put("name", "Bob");
        map.put("age", 21);
        list.add(map);

        // add more data...

        return list;
    }
}

4. 在SimpleAdapterActivity类中，定义一个ArrayList对象，用于存储要显示的列表项数据。

public class SimpleAdapterActivity {

    private ListView listView;
    private List<Map<String, Object>> data;

    public SimpleAdapterActivity() {
        listView = (ListView) findViewById(R.id.listView);

        data = new ArrayList<>();
        data.add(createItem("Alice", 20));
        data.add(createItem("Bob", 21));
        // add more data...

        SimpleAdapter adapter = new SimpleAdapter(
                this,
                data,
                R.layout.list_item,
                new String[] {"name", "age"},
                new int[] {R.id.name, R.id.age});

        listView.setAdapter(adapter);
    }

    private Map<String, Object> createItem(String name, int age) {
        Map<String, Object> map = new HashMap<>();
        map.put("name", name);
        map.put("age", age);
        return map;
    }
}

5. 在SimpleAdapterActivity类的onCreate()方法中，将数据添加到ArrayList中。

public class MainActivity extends AppCompatActivity {

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

        SimpleAdapterActivity simpleAdapterActivity = new SimpleAdapterActivity();
        simpleAdapterActivity.addData("Alice", 20);
        simpleAdapterActivity.addData("Bob", 21);
        // add more data...
    }
}

public class SimpleAdapterActivity {

    private ListView listView;
    private List<Map<String, Object>> data;

    public SimpleAdapterActivity() {
        listView = (ListView) findViewById(R.id.listView);

        data = new ArrayList<>();

        SimpleAdapter adapter = new SimpleAdapter(
                this,
                data,
                R.layout.list_item,
                new String[] {"name", "age"},
                new int[] {R.id.name, R.id.age});

        listView.setAdapter(adapter);
    }

    public void addData(String name, int age) {
        data.add(createItem(name, age));
        ((SimpleAdapter) listView.getAdapter()).notifyDataSetChanged();
    }

    private Map<String, Object> createItem(String name, int age) {
        Map<String, Object> map = new HashMap<>();
        map.put("name", name);
        map.put("age", age);
        return map;
    }
}

6. 在SimpleAdapterActivity类的onCreate()方法中，使用SimpleAdapter对象将数据绑定到列表视图中。

public class MainActivity extends AppCompatActivity {

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

        SimpleAdapterActivity simpleAdapterActivity = new SimpleAdapterActivity();
        simpleAdapterActivity.addData("Alice", 20);
        simpleAdapterActivity.addData("Bob", 21);
        // add more data...
    }
}

public class SimpleAdapterActivity extends Activity {

    private ListView listView;
    private List<Map<String, Object>> data;

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

        listView = (ListView) findViewById(R.id.listView);

        data = new ArrayList<>();

        SimpleAdapter adapter = new SimpleAdapter(
                this,
                data,
                R.layout.list_item,
                new String[] {"name", "age"},
                new int[] {R.id.name, R.id.age});

        listView.setAdapter(adapter);
    }

    public void addData(String name, int age) {
        data.add(createItem(name, age));
        ((SimpleAdapter) listView.getAdapter()).notifyDataSetChanged();
    }

    private Map<String, Object> createItem(String name, int age) {
        Map<String, Object> map = new HashMap<>();
        map.put("name", name);
        map.put("age", age);
        return map;
    }
}

8. 运行应用程序，查看结果并进行调试。