//布局文件1

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.example.hzx.mylistview1.MainActivity">

    <Button
        android:id="@+id/btn_scan"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="top"
        android:text="扫描"/>

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

        <TextView
            android:id="@+id/pname"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="3dp"
            android:textSize="15sp"
            android:layout_weight="1"
            android:text="产品名称"/>

        <TextView
            android:id="@+id/price"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="3dp"
            android:textSize="15sp"
            android:layout_weight="1"
            android:text="产品价格"/>

        <TextView
            android:id="@+id/address"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="3dp"
            android:textSize="15sp"
            android:layout_weight="1"
            android:text="产品产地"/>
    </LinearLayout>


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

    </ListView>


</LinearLayout>

//布局文件2

<?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">

    <TextView
        android:id="@+id/pname"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="3dp"
        android:textSize="15sp"
        android:layout_weight="1"
        android:text="产品名称"/>

    <TextView
        android:id="@+id/price"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="3dp"
        android:textSize="15sp"
        android:layout_weight="1"
        android:text="产品价格"/>

    <TextView
        android:id="@+id/address"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="3dp"
        android:textSize="15sp"
        android:layout_weight="1"
        android:text="产品产地"/>
</LinearLayout>

//activity1

public class MyDataSource {
    private  List<Map<String,String>> listMaps;
    public MyDataSource(){
        listMaps = new ArrayList<Map<String,String>>();
    }

    public   void setMaps(String name,String price,String address){
        Map<String,String> map1 = new HashMap<String,String>();
        map1.put("pname",name);
        map1.put("price",price);
        map1.put("address",address);

        listMaps.add(map1);
    }
    public  List<Map<String,String>>getMaps(){
/*
        Map<String,String> map1 = new HashMap<String,String>();
        map1.put("pname","西瓜");
        map1.put("price","$2.30");
        map1.put("address","海南");


        Map<String,String> map2 = new HashMap<String,String>();
        map2.put("pname","香蕉");
        map2.put("price","$4.30");
        map2.put("address","广西");

        Map<String,String> map3 = new HashMap<String,String>();
        map3.put("pname","南瓜");
        map3.put("price","$1.30");
        map3.put("address","河北");


        listMaps.add(map1);
        listMaps.add(map2);
        listMaps.add(map3);
        */
        return listMaps;
    }
}

//activity2

public class MainActivity extends AppCompatActivity {

    private ListView listView;
    private SimpleAdapter adapter;
    private Button btn_scan;
    private List<Map<String, String>> data = null;

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

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

        My_Data_Source = new MyDataSource();
        data = My_Data_Source.getMaps();
        adapter = new SimpleAdapter(MainActivity.this, data, R.layout.listview_layout,
                new String[]{"pname", "price", "address"}, new int[]{R.id.pname, R.id.price, R.id.address});
        listView.setAdapter(adapter);
        btn_scan = (Button)findViewById(R.id.btn_scan);
        btn_scan.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                My_Data_Source.setMaps("苹果","1.1","广西");
                adapter.notifyDataSetChanged();
            }
        });

    }
}

效果
//每点击一下添加一条Item