如何在单击listview项时启动新活动

Question

当我点击listview项时，我试图启动一个活动。但是当我运行程序时，我得到了一些错误，比如：

    ListView lv;

    private static String[] menu_list = { "list one", "list 2", "list 3" };

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

    public void listview() {
        lv = (ListView) findViewById(R.id.lv_Menu_List);
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
                R.layout.list_layout, menu_list);
        lv.setAdapter(adapter);
        lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {

                // String value =(String)lv.getItemAtPosition(position);

                if (position == 0) {
                    Intent intent = new Intent(this, ListOne.class);
                    startActivity(intent);
                } else if (position == 1) {
                    Intent intent = new Intent(this, List2.class);
                    startActivity(intent);
                } else if (position == 2) {
                    Intent intent = new Intent(this, List3.class);
                    startActivity(intent);
                }

            }
        });
    }
}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.examplemenu.Menu">

    <ListView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/lv_Menu_List"
        android:layout_centerHorizontal="true"
        android:layout_alignParentTop="true" />
</RelativeLayout>

list_layout.xml

    <xml version="1.0" encoding="utf-8"?>
    <TextView xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:paddingBottom="@dimen/activity_vertical_margin"
        android:paddingLeft="@dimen/activity_horizontal_margin"
        android:paddingRight="@dimen/activity_horizontal_margin"
        android:paddingTop="@dimen/activity_vertical_margin"
        android:soundEffectsEnabled="true">
</TextView>

Answer 1

试试这个：

 Intent intent=new Intent(Menu.this,ListOne.class);
 startActivity(intent);

因为只有这个引用AdapterView.OnItemClickListener而不是Menu类。