java - 联系 LoaderManager 和 AdapterView OnClick

Question

我正在尝试将基本的 onClick 事件附加到设备中的联系人列表。联系人列表已正确生成。我的代码摘要如下:

public class Contacts extends AppCompatActivity implements
LoaderManager.LoaderCallbacks<Cursor>,
AdapterView.OnItemClickListener
{
...
       public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.contacts_list_view);

        //initialise loader
        getSupportLoaderManager().initLoader(CONTACTS_LOADER_ID, null, this);

        mContactsList = (ListView) findViewById(android.R.id.list);
        //Gets a CursorAdapter
        mCursorAdapter = new SimpleCursorAdapter(
            this,
            R.layout.contacts_list_item,
            null,
            FROM_COLUMNS, TO_IDS,
            0);
            //Sets the adapter for the ListView
            mContactsList.setAdapter(mCursorAdapter);

       }
     }

        //Followed by all the loader functions

        public Loader<Cursor> onCreateLoader(int loaderId, Bundle args) {}
        ...
        public void onItemClick (AdapterView<?> parent, View view, int  position, long id){
            Toast.makeText(this,
            "hello world",
            Toast.LENGTH_SHORT).show();
        }

但是我的 onItemClick 不起作用。我首先必须创建 OnItemClickListener 的实例吗？我尝试在 onCreate 方法内部和外部执行此操作，但都不起作用。

随后我在 onCreate 方法中尝试了以下操作

   mContactsList.setOnItemClickListener(new AdapterView.OnItemClickListener() {

        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            Toast.makeText(getApplicationContext(),
                    "hello world",
                    Toast.LENGTH_SHORT).show();
        }
    });

Answer 1

public class Contacts extends AppCompatActivity implements LoaderManager.LoaderCallbacks<Cursor>,

    public void onCreate(Bundle savedInstanceState) {

        // Set screen content
        setContentView(R.layout.main_screen_activity_layout);

        // Find the list view
        ListView mContactsList = findViewById(R.id.ID_OF_YOUR_LISTVIEW);

        // Set the click listener
        mContactsList.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Toast.makeText(getApplicationContext(),
                        "hello world",
                        Toast.LENGTH_SHORT).show();
            }
        });

        // Create your adapter and set the adapter to your ListView via mContactsList.setAdapter();
    }